java.lang.Object
- org.apache.geode.DataSerializer

public abstract class DataSerializer
extends java.lang.Object

Provides static helper methods for reading and writing non-primitive data when working with a DataSerializable. For instance, classes that implement DataSerializable can use the DataSerializer in their toData and fromData methods:

 public class Employee implements DataSerializable {
   private int id;
   private String name;
   private Date birthday;
   private Company employer;

   public void toData(DataOutput out) throws IOException {
     out.writeInt(this.id);
     out.writeUTF(this.name);
     DataSerializer.writeDate(this.birthday, out);
     DataSerializer.writeObject(this.employer, out);
   }

   public void fromData(DataInput in) throws IOException, ClassNotFoundException {

     this.id = in.readInt();
     this.name = in.readUTF();
     this.birthday = DataSerializer.readDate(in);
     this.employer = (Company) DataSerializer.readObject(in);
   }
 }

Instances of DataSerializer are used to data serialize objects (such as instances of standard Java classes or third-party classes for which the source code is not available) that do not implement the DataSerializable interface.

The following DataSerializer data serializes instances of Company. In order for the data serialization framework to consult this custom serializer, it must be registered with the framework.

public class CompanySerializer extends DataSerializer {

  static {
    DataSerializer.register(CompanySerializer.class);
  }

  /**
 May be invoked reflectively if instances of Company are
 distributed to other VMs.
/
  public CompanySerializer() {

  }

  public Class[] getSupportedClasses() {
    return new Class[] { Company.class };
  }
  public int getId() {
    return 42;
  }

  public boolean toData(Object o, DataOutput out)
    throws IOException {
    if (o instanceof Company) {
      Company company = (Company) o;
      out.writeUTF(company.getName());

      // Let's assume that Address is java.io.Serializable
      Address address = company.getAddress();
      writeObject(address, out);
      return true;

    } else {
      return false;
    }
  }

  public Object fromData(DataInput in)
    throws IOException, ClassNotFoundException {

    String name = in.readUTF();
    Address address = (Address) readObject(in);
    return new Company(name, address);
  }
}

Just like Instantiators, a DataSerializer may be sent to other members of the distributed system when it is registered. The data serialization framework does not require that a DataSerializer be Serializable, but it does require that it provide a zero-argument constructor.

Since:: GemFire 3.5
See Also:: writeObject(Object, DataOutput), readObject(java.io.DataInput)

Field Summary

Fields
Modifier and Type	Field	Description
`protected static java.lang.ThreadLocal<java.lang.Boolean>`	`DISALLOW_JAVA_SERIALIZATION`
`protected static byte`	`DOUBLE`
`protected static byte`	`INT`
`protected static byte`	`LONG`
`protected static byte`	`PRESENT`
`protected static boolean`	`TRACE_SERIALIZABLE`	Deprecated. Use Boolean.getBoolean("DataSerializer.TRACE_SERIALIZABLE") instead.

Constructor Summary

Constructors
Constructor Description

DataSerializer()
Creates a new DataSerializer.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(java.lang.Object o)`	Two `DataSerializer`s are consider to be equal if they have the same id and the same class
`abstract java.lang.Object`	`fromData(java.io.DataInput in)`	Reads an object from a `DataInput`.
`java.lang.Object`	`getContext()`	For internal use only.
`java.lang.Object`	`getEventId()`	For internal use only.
`abstract int`	`getId()`	Returns the id of this `DataSerializer`.
`abstract java.lang.Class<?>[]`	`getSupportedClasses()`	Returns the `Class`es whose instances are data serialized by this `DataSerializer`.
`int`	`hashCode()`
`static <E> java.util.ArrayList<E>`	`readArrayList(java.io.DataInput in)`	Reads an `ArrayList` from a `DataInput`.
`static byte[][]`	`readArrayOfByteArrays(java.io.DataInput in)`	Reads an array of `byte[]`s from a `DataInput`.
`static java.lang.Boolean`	`readBoolean(java.io.DataInput in)`	Reads an instance of `Boolean` from a `DataInput`.
`static boolean[]`	`readBooleanArray(java.io.DataInput in)`	Reads an array of `boolean`s from a `DataInput`.
`static java.lang.Byte`	`readByte(java.io.DataInput in)`	Reads an instance of `Byte` from a `DataInput`.
`static byte[]`	`readByteArray(java.io.DataInput in)`	Reads an array of `byte`s from a `DataInput`.
`static java.lang.Character`	`readCharacter(java.io.DataInput in)`	Reads an instance of `Character` from a `DataInput`.
`static char[]`	`readCharArray(java.io.DataInput in)`	Reads an array of `char`s from a `DataInput`.
`static java.lang.Class<?>`	`readClass(java.io.DataInput in)`	Reads an instance of `Class` from a `DataInput`.
`static <K,V> java.util.concurrent.ConcurrentHashMap<K,V>`	`readConcurrentHashMap(java.io.DataInput in)`	Reads a `ConcurrentHashMap` from a `DataInput`.
`static java.util.Date`	`readDate(java.io.DataInput in)`	Reads an instance of `Date` from a `DataInput`.
`static java.lang.Double`	`readDouble(java.io.DataInput in)`	Reads an instance of `Double` from a `DataInput`.
`static double[]`	`readDoubleArray(java.io.DataInput in)`	Reads an array of `double`s from a `DataInput`.
`static <E extends java.lang.Enum<E>> E`	`readEnum(java.lang.Class<E> clazz, java.io.DataInput in)`	Reads an `Enum constant` from `DataInput`.
`static java.io.File`	`readFile(java.io.DataInput in)`	Reads an instance of `File` from a `DataInput`.
`static java.lang.Float`	`readFloat(java.io.DataInput in)`	Reads an instance of `Float` from a `DataInput`.
`static float[]`	`readFloatArray(java.io.DataInput in)`	Reads an array of `float`s from a `DataInput`.
`static <K,V> java.util.HashMap<K,V>`	`readHashMap(java.io.DataInput in)`	Reads a `HashMap` from a `DataInput`.
`static <E> java.util.HashSet<E>`	`readHashSet(java.io.DataInput in)`	Reads a `HashSet` from a `DataInput`.
`static <K,V> java.util.Hashtable<K,V>`	`readHashtable(java.io.DataInput in)`	Reads a `Hashtable` from a `DataInput`.
`static <K,V> java.util.IdentityHashMap<K,V>`	`readIdentityHashMap(java.io.DataInput in)`	Reads an `IdentityHashMap` from a `DataInput`.
`static java.net.InetAddress`	`readInetAddress(java.io.DataInput in)`	Reads an instance of `InetAddress` from a `DataInput`.
`static int[]`	`readIntArray(java.io.DataInput in)`	Reads an `int` array from a `DataInput`.
`static java.lang.Integer`	`readInteger(java.io.DataInput in)`	Reads an instance of `Integer` from a `DataInput`.
`static <K,V> java.util.LinkedHashMap<K,V>`	`readLinkedHashMap(java.io.DataInput in)`	Reads a `LinkedHashMap` from a `DataInput`.
`static <E> java.util.LinkedHashSet<E>`	`readLinkedHashSet(java.io.DataInput in)`	Reads a `LinkedHashSet` from a `DataInput`.
`static <E> java.util.LinkedList<E>`	`readLinkedList(java.io.DataInput in)`	Reads a `LinkedList` from a `DataInput`.
`static java.lang.Long`	`readLong(java.io.DataInput in)`	Reads an instance of `Long` from a `DataInput`.
`static long[]`	`readLongArray(java.io.DataInput in)`	Reads an array of `long`s from a `DataInput`.
`static java.lang.String`	`readNonPrimitiveClassName(java.io.DataInput in)`	Reads name of an instance of `Class` from a `DataInput`.
`static <T> T`	`readObject(java.io.DataInput in)`	Reads an arbitrary object from a `DataInput`.
`static java.lang.Object[]`	`readObjectArray(java.io.DataInput in)`	Reads an array of `Object`s from a `DataInput`.
`static <T> java.util.Optional<T>`	`readOptional(java.io.DataInput in)`	Reads an `Optional` from a `DataInput`.
`static java.util.OptionalDouble`	`readOptionalDouble(java.io.DataInput in)`	Reads an `OptionalDouble` from a `DataInput`.
`static java.util.OptionalInt`	`readOptionalInt(java.io.DataInput in)`	Reads an `OptionalInt` from a `DataInput`.
`static java.util.OptionalLong`	`readOptionalLong(java.io.DataInput in)`	Reads an `OptionalLong` from a `DataInput`.
`protected static <T> T`	`readOptionalPrimitive(java.io.DataInput in)`
`static boolean`	`readPrimitiveBoolean(java.io.DataInput in)`	Reads a primitive `boolean` from a `DataInput`.
`static byte`	`readPrimitiveByte(java.io.DataInput in)`	Reads a primitive `byte` from a `DataInput`.
`static char`	`readPrimitiveChar(java.io.DataInput in)`	Reads a primitive `char` from a `DataInput`.
`static double`	`readPrimitiveDouble(java.io.DataInput in)`	Reads a primitive `double` from a `DataInput`.
`static float`	`readPrimitiveFloat(java.io.DataInput in)`	Reads a primitive `float` from a `DataInput`.
`static int`	`readPrimitiveInt(java.io.DataInput in)`	Reads a primitive `int` from a `DataInput`.
`static long`	`readPrimitiveLong(java.io.DataInput in)`	Reads a primitive `long` from a `DataInput`.
`static short`	`readPrimitiveShort(java.io.DataInput in)`	Reads a primitive `short` from a `DataInput`.
`static java.util.Properties`	`readProperties(java.io.DataInput in)`	Reads a `Properties` from a `DataInput`.
`static <K,V> Region<K,V>`	`readRegion(java.io.DataInput in)`	Reads an instance of Region.
`static java.lang.Short`	`readShort(java.io.DataInput in)`	Reads an instance of `Short` from a `DataInput`.
`static short[]`	`readShortArray(java.io.DataInput in)`	Reads an array of `short`s from a `DataInput`.
`static <E> java.util.Stack<E>`	`readStack(java.io.DataInput in)`	Reads a `Stack` from a `DataInput`.
`static java.lang.String`	`readString(java.io.DataInput in)`	Reads an instance of `String` from a `DataInput`.
`static java.lang.String[]`	`readStringArray(java.io.DataInput in)`	Reads an array of `String`s from a `DataInput`.
`static <K,V> java.util.TreeMap<K,V>`	`readTreeMap(java.io.DataInput in)`	Reads a `TreeMap` from a `DataInput`.
`static <E> java.util.TreeSet<E>`	`readTreeSet(java.io.DataInput in)`	Reads a `TreeSet` from a `DataInput`.
`static int`	`readUnsignedByte(java.io.DataInput in)`	Reads a primitive `int` as an unsigned byte from a `DataInput` using `DataInput.readUnsignedByte()`.
`static int`	`readUnsignedShort(java.io.DataInput in)`	Reads a primitive `int` as an unsigned short from a `DataInput` using `DataInput.readUnsignedShort()`.
`static <E> java.util.Vector<E>`	`readVector(java.io.DataInput in)`	Reads a `Vector` from a `DataInput`.
`static DataSerializer`	`register(java.lang.Class<?> c)`	Registers a `DataSerializer` class with the data serialization framework.
`void`	`setContext(java.lang.Object context)`	For internal use only.
`void`	`setEventId(java.lang.Object eventId)`	For internal use only.
`abstract boolean`	`toData(java.lang.Object o, java.io.DataOutput out)`	Data serializes an object to a `DataOutput`.
`static void`	`writeArrayList(java.util.ArrayList<?> list, java.io.DataOutput out)`	Writes an `ArrayList` to a `DataOutput`.
`static void`	`writeArrayOfByteArrays(byte[][] array, java.io.DataOutput out)`	Writes an array of `byte[]` to a `DataOutput`.
`static void`	`writeBoolean(java.lang.Boolean value, java.io.DataOutput out)`	Writes an instance of `Boolean` to a `DataOutput`.
`static void`	`writeBooleanArray(boolean[] array, java.io.DataOutput out)`	Writes an array of `boolean`s to a `DataOutput`.
`static void`	`writeByte(java.lang.Byte value, java.io.DataOutput out)`	Writes an instance of `Byte` to a `DataOutput`.
`static void`	`writeByteArray(byte[] array, int len, java.io.DataOutput out)`	Writes the first `len` elements of an array of `byte`s to a `DataOutput`.
`static void`	`writeByteArray(byte[] array, java.io.DataOutput out)`	Writes an array of `byte`s to a `DataOutput`.
`static void`	`writeCharacter(java.lang.Character value, java.io.DataOutput out)`	Writes an instance of `Character` to a `DataOutput`.
`static void`	`writeCharArray(char[] array, java.io.DataOutput out)`	Writes an array of `char`s to a `DataOutput`.
`static void`	`writeClass(java.lang.Class<?> c, java.io.DataOutput out)`	Writes an instance of `Class` to a `DataOutput`.
`static void`	`writeConcurrentHashMap(java.util.concurrent.ConcurrentHashMap<?,?> map, java.io.DataOutput out)`	Writes a `ConcurrentHashMap` to a `DataOutput`.
`static void`	`writeDate(java.util.Date date, java.io.DataOutput out)`	Writes an instance of `Date` to a `DataOutput`.
`static void`	`writeDouble(java.lang.Double value, java.io.DataOutput out)`	Writes an instance of `Double` to a `DataOutput`.
`static void`	`writeDoubleArray(double[] array, java.io.DataOutput out)`	Writes an array of `double`s to a `DataOutput`.
`static void`	`writeEnum(java.lang.Enum<?> e, java.io.DataOutput out)`	Writes the `Enum constant` to `DataOutput`.
`static void`	`writeFile(java.io.File file, java.io.DataOutput out)`	Writes an instance of `File` to a `DataOutput`.
`static void`	`writeFloat(java.lang.Float value, java.io.DataOutput out)`	Writes an instance of `Float` to a `DataOutput`.
`static void`	`writeFloatArray(float[] array, java.io.DataOutput out)`	Writes an array of `float`s to a `DataOutput`.
`static void`	`writeHashMap(java.util.Map<?,?> map, java.io.DataOutput out)`	Writes a `HashMap` to a `DataOutput`.
`static void`	`writeHashSet(java.util.HashSet<?> set, java.io.DataOutput out)`	Writes a `HashSet` to a `DataOutput`.
`static void`	`writeHashtable(java.util.Hashtable<?,?> map, java.io.DataOutput out)`	Writes a `Hashtable` to a `DataOutput`.
`static void`	`writeIdentityHashMap(java.util.IdentityHashMap<?,?> map, java.io.DataOutput out)`	Writes an `IdentityHashMap` to a `DataOutput`.
`static void`	`writeInetAddress(java.net.InetAddress address, java.io.DataOutput out)`	Writes an instance of `InetAddress` to a `DataOutput`.
`static void`	`writeIntArray(int[] array, java.io.DataOutput out)`	Writes an `int` array to a `DataOutput`.
`static void`	`writeInteger(java.lang.Integer value, java.io.DataOutput out)`	Writes an instance of `Integer` to a `DataOutput`.
`static void`	`writeLinkedHashMap(java.util.Map<?,?> map, java.io.DataOutput out)`	Writes a `LinkedHashMap` to a `DataOutput`.
`static void`	`writeLinkedHashSet(java.util.LinkedHashSet<?> set, java.io.DataOutput out)`	Writes a `LinkedHashSet` to a `DataOutput`.
`static void`	`writeLinkedList(java.util.LinkedList<?> list, java.io.DataOutput out)`	Writes a `LinkedList` to a `DataOutput`.
`static void`	`writeLong(java.lang.Long value, java.io.DataOutput out)`	Writes an instance of `Long` to a `DataOutput`.
`static void`	`writeLongArray(long[] array, java.io.DataOutput out)`	Writes an array of `long`s to a `DataOutput`.
`static void`	`writeNonPrimitiveClassName(java.lang.String className, java.io.DataOutput out)`	Writes class name to a `DataOutput`.
`static void`	`writeObject(java.lang.Object o, java.io.DataOutput out)`	Writes an arbitrary object to a `DataOutput` by calling `writeObject(Object, DataOutput, boolean)` with `true`.
`static void`	`writeObject(java.lang.Object o, java.io.DataOutput out, boolean allowJavaSerialization)`	Writes an arbitrary object to a `DataOutput` by serializing it into bytes.
`static void`	`writeObjectArray(java.lang.Object[] array, java.io.DataOutput out)`	Writes an array of `Object`s to a `DataOutput`.
`static void`	`writeObjectAsByteArray(java.lang.Object obj, java.io.DataOutput out)`	Serialize the given object `obj` into a byte array using `writeObject(Object, DataOutput)` and then writes the byte array to the given data output `out` in the same format `writeByteArray(byte[], DataOutput)` does.
`static <T> void`	`writeOptional(java.util.Optional<T> o, java.io.DataOutput out)`	Writes an `Optional` to a `DataOutput`.
`static void`	`writeOptionalDouble(java.util.OptionalDouble o, java.io.DataOutput out)`	Writes an `OptionalDouble` to a `DataOutput`.
`static void`	`writeOptionalInt(java.util.OptionalInt o, java.io.DataOutput out)`	Writes an `OptionalInt` to a `DataOutput`.
`static void`	`writeOptionalLong(java.util.OptionalLong o, java.io.DataOutput out)`	Writes an `OptionalLong` to a `DataOutput`.
`static void`	`writePrimitiveBoolean(boolean value, java.io.DataOutput out)`	Writes a primitive `boolean` to a `DataOutput`.
`static void`	`writePrimitiveByte(byte value, java.io.DataOutput out)`	Writes a primitive `byte` to a `DataOutput`.
`static void`	`writePrimitiveChar(char value, java.io.DataOutput out)`	Writes a primitive `char` to a `DataOutput`.
`static void`	`writePrimitiveDouble(double value, java.io.DataOutput out)`	Writes a primitive `double` to a `DataOutput`.
`static void`	`writePrimitiveFloat(float value, java.io.DataOutput out)`	Writes a primitive `float` to a `DataOutput`.
`static void`	`writePrimitiveInt(int value, java.io.DataOutput out)`	Writes a primitive `int` to a `DataOutput`.
`static void`	`writePrimitiveLong(long value, java.io.DataOutput out)`	Writes a primitive `long` to a `DataOutput`.
`static void`	`writePrimitiveShort(short value, java.io.DataOutput out)`	Writes a primitive `short` to a `DataOutput`.
`static void`	`writeProperties(java.util.Properties props, java.io.DataOutput out)`	Writes a `Properties` to a `DataOutput`.
`static void`	`writeRegion(Region<?,?> rgn, java.io.DataOutput out)`	Writes an instance of Region.
`static void`	`writeShort(java.lang.Short value, java.io.DataOutput out)`	Writes an instance of `Short` to a `DataOutput`.
`static void`	`writeShortArray(short[] array, java.io.DataOutput out)`	Writes an array of `short`s to a `DataOutput`.
`static void`	`writeStack(java.util.Stack<?> list, java.io.DataOutput out)`	Writes a `Stack` to a `DataOutput`.
`static void`	`writeString(java.lang.String value, java.io.DataOutput out)`	Writes an instance of `String` to a `DataOutput`.
`static void`	`writeStringArray(java.lang.String[] array, java.io.DataOutput out)`	Writes an array of `String`s to a `DataOutput`.
`static void`	`writeTreeMap(java.util.TreeMap<?,?> map, java.io.DataOutput out)`	Writes a `TreeMap` to a `DataOutput`.
`static void`	`writeTreeSet(java.util.TreeSet<?> set, java.io.DataOutput out)`	Writes a `TreeSet` to a `DataOutput`.
`static void`	`writeUnsignedByte(int value, java.io.DataOutput out)`	Writes a primitive `int` as an unsigned byte to a `DataOutput`.
`static void`	`writeUnsignedShort(int value, java.io.DataOutput out)`	Writes a primitive `int` as an unsigned short to a `DataOutput`.
`static void`	`writeVector(java.util.Vector<?> list, java.io.DataOutput out)`	Writes a `Vector` to a `DataOutput`.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PRESENT
```
protected static final byte PRESENT
```
    See Also:
    
    Constant Field Values
  - INT
```
protected static final byte INT
```
    See Also:
    
    Constant Field Values
  - LONG
```
protected static final byte LONG
```
    See Also:
    
    Constant Field Values
  - DOUBLE
```
protected static final byte DOUBLE
```
    See Also:
    
    Constant Field Values
  - TRACE_SERIALIZABLE
```
@Deprecated
protected static final boolean TRACE_SERIALIZABLE
```
    Deprecated.
    Use Boolean.getBoolean("DataSerializer.TRACE_SERIALIZABLE") instead.
  - DISALLOW_JAVA_SERIALIZATION
```
protected static final java.lang.ThreadLocal<java.lang.Boolean> DISALLOW_JAVA_SERIALIZATION
```
- Constructor Detail
  - DataSerializer
```
public DataSerializer()
```
    Creates a new DataSerializer. All class that implement DataSerializer must provide a zero-argument constructor.
    
    See Also:
    
    register(Class)
- Method Detail
  - writeClass
```
public static void writeClass(java.lang.Class<?> c,
                              java.io.DataOutput out)
                       throws java.io.IOException
```
    Writes an instance of Class to a DataOutput. This method will handle a null value and not throw a NullPointerException.
    
    Parameters:
    
    c - the Class to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readClass(java.io.DataInput)
  - writeNonPrimitiveClassName
```
public static void writeNonPrimitiveClassName(java.lang.String className,
                                              java.io.DataOutput out)
                                       throws java.io.IOException
```
    Writes class name to a DataOutput. This method will handle a null value and not throw a NullPointerException.
    
    Parameters:
    
    className - the class name to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readNonPrimitiveClassName(DataInput)
  - readClass
```
public static java.lang.Class<?> readClass(java.io.DataInput in)
                                    throws java.io.IOException,
                                           java.lang.ClassNotFoundException
```
    Reads an instance of Class from a DataInput. The class will be loaded using the current content class loader. The return value may be null.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Class
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class cannot be loaded
  - readNonPrimitiveClassName
```
public static java.lang.String readNonPrimitiveClassName(java.io.DataInput in)
                                                  throws java.io.IOException
```
    Reads name of an instance of Class from a DataInput. The return value may be null.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Class name
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeNonPrimitiveClassName(String, DataOutput)
  - writeRegion
```
public static void writeRegion(Region<?,?> rgn,
                               java.io.DataOutput out)
                        throws java.io.IOException
```
    Writes an instance of Region. A Region is serialized as just a reference to a full path only. It will be recreated on the other end by calling CacheFactory.getAnyInstance() and then calling getRegion on it. This method will handle a null value and not throw a NullPointerException.
    
    Parameters:
    
    rgn - the Region to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - if a problem occurs while reading from in
  - readRegion
```
public static <K,V> Region<K,V> readRegion(java.io.DataInput in)
                                                throws java.io.IOException,
                                                       java.lang.ClassNotFoundException
```
    Reads an instance of Region. A Region is serialized as a reference to a full path only. It is recreated on the other end by calling CacheFactory.getAnyInstance() and then calling getRegion on it. The return value may be null.
    
    Type Parameters:
    
    K - the type of keys in the region
    
    V - the type of values in the region
    
    Parameters:
    
    in - the input stream
    
    Returns:
    
    the Region instance
    
    Throws:
    
    CacheClosedException - if a cache has not been created or the only created one is closed.
    
    RegionNotFoundException - if there is no region by this name in the Cache. Since this exception is deprecated, please see RegionNotFoundException for alternatives.
    
    java.io.IOException - if a problem occurs while reading from in
    
    java.lang.ClassNotFoundException - if the class of one of the Region's elements cannot be found.
  - writeDate
```
public static void writeDate(java.util.Date date,
                             java.io.DataOutput out)
                      throws java.io.IOException
```
    Writes an instance of Date to a DataOutput. Note that even though date may be an instance of a subclass of Date, readDate will always return an instance of Date, not an instance of the subclass. To preserve the class type of date,\ writeObject(Object, DataOutput) should be used for data serialization. This method will handle a null value and not throw a NullPointerException.
    
    Parameters:
    
    date - the Date to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readDate(java.io.DataInput)
  - readDate
```
public static java.util.Date readDate(java.io.DataInput in)
                               throws java.io.IOException
```
    Reads an instance of Date from a DataInput. The return value may be null.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Date
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeFile
```
public static void writeFile(java.io.File file,
                             java.io.DataOutput out)
                      throws java.io.IOException
```
    Writes an instance of File to a DataOutput. Note that even though file may be an instance of a subclass of File, readFile will always return an instance of File, not an instance of the subclass. To preserve the class type of file, writeObject(Object, DataOutput) should be used for data serialization. This method will handle a null value and not throw a NullPointerException.
    
    Parameters:
    
    file - the File to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readFile(java.io.DataInput), File.getCanonicalPath()
  - readFile
```
public static java.io.File readFile(java.io.DataInput in)
                             throws java.io.IOException
```
    Reads an instance of File from a DataInput. The return value may be null.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized File
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeInetAddress
```
public static void writeInetAddress(java.net.InetAddress address,
                                    java.io.DataOutput out)
                             throws java.io.IOException
```
    Writes an instance of InetAddress to a DataOutput. The InetAddress is data serialized by writing its byte representation to the DataOutput. readInetAddress(java.io.DataInput) converts the byte representation to an instance of InetAddress using InetAddress.getAddress(). As a result, if address is an instance of a user-defined subclass of InetAddress (that is, not an instance of one of the subclasses from the java.net package), its class will not be preserved. In order to be able to read an instance of the user-defined class, writeObject(Object, DataOutput) should be used. This method will handle a null value and not throw a NullPointerException.
    
    Parameters:
    
    address - the InetAddress to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readInetAddress(java.io.DataInput)
  - readInetAddress
```
public static java.net.InetAddress readInetAddress(java.io.DataInput in)
                                            throws java.io.IOException
```
    Reads an instance of InetAddress from a DataInput. The return value may be null.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized InetAddress
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in or the address read from in is unknown
    
    See Also:
    
    InetAddress.getAddress()
  - writeString
```
public static void writeString(java.lang.String value,
                               java.io.DataOutput out)
                        throws java.io.IOException
```
    Writes an instance of String to a DataOutput. This method will handle a null value and not throw a NullPointerException.
    As of 5.7 strings longer than 0xFFFF can be serialized.
    
    Parameters:
    
    value - the String to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readString(java.io.DataInput)
  - readString
```
public static java.lang.String readString(java.io.DataInput in)
                                   throws java.io.IOException
```
    Reads an instance of String from a DataInput. The return value may be null.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized String
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeString(java.lang.String, java.io.DataOutput)
  - writeBoolean
```
public static void writeBoolean(java.lang.Boolean value,
                                java.io.DataOutput out)
                         throws java.io.IOException
```
    Writes an instance of Boolean to a DataOutput.
    
    Parameters:
    
    value - the Boolean to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readBoolean(java.io.DataInput)
  - readBoolean
```
public static java.lang.Boolean readBoolean(java.io.DataInput in)
                                     throws java.io.IOException
```
    Reads an instance of Boolean from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Boolean
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeCharacter
```
public static void writeCharacter(java.lang.Character value,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes an instance of Character to a DataOutput.
    
    Parameters:
    
    value - the Character to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readCharacter(java.io.DataInput)
  - readCharacter
```
public static java.lang.Character readCharacter(java.io.DataInput in)
                                         throws java.io.IOException
```
    Reads an instance of Character from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Character
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeByte
```
public static void writeByte(java.lang.Byte value,
                             java.io.DataOutput out)
                      throws java.io.IOException
```
    Writes an instance of Byte to a DataOutput.
    
    Parameters:
    
    value - the Byte to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readByte(java.io.DataInput)
  - readByte
```
public static java.lang.Byte readByte(java.io.DataInput in)
                               throws java.io.IOException
```
    Reads an instance of Byte from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Byte
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeShort
```
public static void writeShort(java.lang.Short value,
                              java.io.DataOutput out)
                       throws java.io.IOException
```
    Writes an instance of Short to a DataOutput.
    
    Parameters:
    
    value - the Short to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readShort(java.io.DataInput)
  - readShort
```
public static java.lang.Short readShort(java.io.DataInput in)
                                 throws java.io.IOException
```
    Reads an instance of Short from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Short
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeInteger
```
public static void writeInteger(java.lang.Integer value,
                                java.io.DataOutput out)
                         throws java.io.IOException
```
    Writes an instance of Integer to a DataOutput.
    
    Parameters:
    
    value - the Integer to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readInteger(java.io.DataInput)
  - readInteger
```
public static java.lang.Integer readInteger(java.io.DataInput in)
                                     throws java.io.IOException
```
    Reads an instance of Integer from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Integer
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeLong
```
public static void writeLong(java.lang.Long value,
                             java.io.DataOutput out)
                      throws java.io.IOException
```
    Writes an instance of Long to a DataOutput.
    
    Parameters:
    
    value - the Long to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readLong(java.io.DataInput)
  - readLong
```
public static java.lang.Long readLong(java.io.DataInput in)
                               throws java.io.IOException
```
    Reads an instance of Long from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Long
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeFloat
```
public static void writeFloat(java.lang.Float value,
                              java.io.DataOutput out)
                       throws java.io.IOException
```
    Writes an instance of Float to a DataOutput.
    
    Parameters:
    
    value - the Float to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readFloat(java.io.DataInput)
  - readFloat
```
public static java.lang.Float readFloat(java.io.DataInput in)
                                 throws java.io.IOException
```
    Reads an instance of Float from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Float
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeDouble
```
public static void writeDouble(java.lang.Double value,
                               java.io.DataOutput out)
                        throws java.io.IOException
```
    Writes an instance of Double to a DataOutput.
    
    Parameters:
    
    value - the Double to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if value is null.
    
    See Also:
    
    readDouble(java.io.DataInput)
  - readDouble
```
public static java.lang.Double readDouble(java.io.DataInput in)
                                   throws java.io.IOException
```
    Reads an instance of Double from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Double
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writePrimitiveBoolean
```
public static void writePrimitiveBoolean(boolean value,
                                         java.io.DataOutput out)
                                  throws java.io.IOException
```
    Writes a primitive boolean to a DataOutput.
    
    Parameters:
    
    value - the primitive boolean to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeBoolean(boolean)
  - readPrimitiveBoolean
```
public static boolean readPrimitiveBoolean(java.io.DataInput in)
                                    throws java.io.IOException
```
    Reads a primitive boolean from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized primitive boolean
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readBoolean()
  - writePrimitiveByte
```
public static void writePrimitiveByte(byte value,
                                      java.io.DataOutput out)
                               throws java.io.IOException
```
    Writes a primitive byte to a DataOutput.
    
    Parameters:
    
    value - the primitive byte to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeByte(int)
  - readPrimitiveByte
```
public static byte readPrimitiveByte(java.io.DataInput in)
                              throws java.io.IOException
```
    Reads a primitive byte from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized primitive byte
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readByte()
  - writePrimitiveChar
```
public static void writePrimitiveChar(char value,
                                      java.io.DataOutput out)
                               throws java.io.IOException
```
    Writes a primitive char to a DataOutput.
    
    Parameters:
    
    value - the primitive char to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeChar(int)
  - readPrimitiveChar
```
public static char readPrimitiveChar(java.io.DataInput in)
                              throws java.io.IOException
```
    Reads a primitive char from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized primitive char
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readChar()
  - writePrimitiveShort
```
public static void writePrimitiveShort(short value,
                                       java.io.DataOutput out)
                                throws java.io.IOException
```
    Writes a primitive short to a DataOutput.
    
    Parameters:
    
    value - the primitive short to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeShort(int)
  - readPrimitiveShort
```
public static short readPrimitiveShort(java.io.DataInput in)
                                throws java.io.IOException
```
    Reads a primitive short from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized primitive short
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readShort()
  - writeUnsignedByte
```
public static void writeUnsignedByte(int value,
                                     java.io.DataOutput out)
                              throws java.io.IOException
```
    Writes a primitive int as an unsigned byte to a DataOutput.
    
    Parameters:
    
    value - the primitive int as an unsigned byte to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeByte(int), DataInput.readUnsignedByte()
  - readUnsignedByte
```
public static int readUnsignedByte(java.io.DataInput in)
                            throws java.io.IOException
```
    Reads a primitive int as an unsigned byte from a DataInput using DataInput.readUnsignedByte().
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized primitive int as an unsigned byte
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
  - writeUnsignedShort
```
public static void writeUnsignedShort(int value,
                                      java.io.DataOutput out)
                               throws java.io.IOException
```
    Writes a primitive int as an unsigned short to a DataOutput.
    
    Parameters:
    
    value - the primitive int as an unsigned short to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeShort(int), DataInput.readUnsignedShort()
  - readUnsignedShort
```
public static int readUnsignedShort(java.io.DataInput in)
                             throws java.io.IOException
```
    Reads a primitive int as an unsigned short from a DataInput using DataInput.readUnsignedShort().
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized primitive int as an unsigned short
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
  - writePrimitiveInt
```
public static void writePrimitiveInt(int value,
                                     java.io.DataOutput out)
                              throws java.io.IOException
```
    Writes a primitive int to a DataOutput.
    
    Parameters:
    
    value - the primitive int to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    DataOutput.writeInt(int)
  - readPrimitiveInt
```
public static int readPrimitiveInt(java.io.DataInput in)
                            throws java.io.IOException
```
    Reads a primitive int from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    a primitive int
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readInt()
  - writePrimitiveLong
```
public static void writePrimitiveLong(long value,
                                      java.io.DataOutput out)
                               throws java.io.IOException
```
    Writes a primitive long to a DataOutput.
    
    Parameters:
    
    value - the primitive long to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeLong(long)
  - readPrimitiveLong
```
public static long readPrimitiveLong(java.io.DataInput in)
                              throws java.io.IOException
```
    Reads a primitive long from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    a primitive long
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readLong()
  - writePrimitiveFloat
```
public static void writePrimitiveFloat(float value,
                                       java.io.DataOutput out)
                                throws java.io.IOException
```
    Writes a primitive float to a DataOutput.
    
    Parameters:
    
    value - the primitive float to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeFloat(float)
  - readPrimitiveFloat
```
public static float readPrimitiveFloat(java.io.DataInput in)
                                throws java.io.IOException
```
    Reads a primitive float from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    a primitive float
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readFloat()
  - writePrimitiveDouble
```
public static void writePrimitiveDouble(double value,
                                        java.io.DataOutput out)
                                 throws java.io.IOException
```
    Writes a primitive double to a DataOutput.
    
    Parameters:
    
    value - the primitive double to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataOutput.writeDouble(double)
  - readPrimitiveDouble
```
public static double readPrimitiveDouble(java.io.DataInput in)
                                  throws java.io.IOException
```
    Reads a primitive double from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    a primitive double
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.1
    
    See Also:
    
    DataInput.readDouble()
  - writeByteArray
```
public static void writeByteArray(byte[] array,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes an array of bytes to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of bytes to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readByteArray(java.io.DataInput)
  - writeByteArray
```
public static void writeByteArray(byte[] array,
                                  int len,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes the first len elements of an array of bytes to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of bytes to write
    
    len - the actual number of entries to write. If len is greater than then length of the
    
    out - the DataOutput to write to array then the entire array is written.
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readByteArray(java.io.DataInput)
  - writeObjectAsByteArray
```
public static void writeObjectAsByteArray(java.lang.Object obj,
                                          java.io.DataOutput out)
                                   throws java.io.IOException
```
    Serialize the given object obj into a byte array using writeObject(Object, DataOutput) and then writes the byte array to the given data output out in the same format writeByteArray(byte[], DataOutput) does. This method will serialize a null obj and not throw a NullPointerException.
    
    Parameters:
    
    obj - the object to serialize and write
    
    out - the data output to write the byte array to
    
    Throws:
    
    java.lang.IllegalArgumentException - if a problem occurs while serialize obj
    
    java.io.IOException - if a problem occurs while writing to out
    
    Since:
    
    GemFire 5.0.2
    
    See Also:
    
    readByteArray(java.io.DataInput)
  - readByteArray
```
public static byte[] readByteArray(java.io.DataInput in)
                            throws java.io.IOException
```
    Reads an array of bytes from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of bytes
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeByteArray(byte[], DataOutput)
  - writeStringArray
```
public static void writeStringArray(java.lang.String[] array,
                                    java.io.DataOutput out)
                             throws java.io.IOException
```
    Writes an array of Strings to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of Strings to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readStringArray(java.io.DataInput), writeString(java.lang.String, java.io.DataOutput)
  - readStringArray
```
public static java.lang.String[] readStringArray(java.io.DataInput in)
                                          throws java.io.IOException
```
    Reads an array of Strings from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of Strings
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeStringArray(java.lang.String[], java.io.DataOutput)
  - writeShortArray
```
public static void writeShortArray(short[] array,
                                   java.io.DataOutput out)
                            throws java.io.IOException
```
    Writes an array of shorts to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of shorts to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readShortArray(java.io.DataInput)
  - readShortArray
```
public static short[] readShortArray(java.io.DataInput in)
                              throws java.io.IOException
```
    Reads an array of shorts from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of shorts
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeShortArray(short[], java.io.DataOutput)
  - writeCharArray
```
public static void writeCharArray(char[] array,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes an array of chars to a DataOutput.
    
    Parameters:
    
    array - the array of chars to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readCharArray(java.io.DataInput)
  - readCharArray
```
public static char[] readCharArray(java.io.DataInput in)
                            throws java.io.IOException
```
    Reads an array of chars from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of chars
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeCharArray(char[], java.io.DataOutput)
  - writeBooleanArray
```
public static void writeBooleanArray(boolean[] array,
                                     java.io.DataOutput out)
                              throws java.io.IOException
```
    Writes an array of booleans to a DataOutput.
    
    Parameters:
    
    array - the array of booleans to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readBooleanArray(java.io.DataInput)
  - readBooleanArray
```
public static boolean[] readBooleanArray(java.io.DataInput in)
                                  throws java.io.IOException
```
    Reads an array of booleans from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of booleans
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeBooleanArray(boolean[], java.io.DataOutput)
  - writeIntArray
```
public static void writeIntArray(int[] array,
                                 java.io.DataOutput out)
                          throws java.io.IOException
```
    Writes an int array to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of ints to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readIntArray(java.io.DataInput)
  - readIntArray
```
public static int[] readIntArray(java.io.DataInput in)
                          throws java.io.IOException
```
    Reads an int array from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of ints
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeIntArray(int[], java.io.DataOutput)
  - writeLongArray
```
public static void writeLongArray(long[] array,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes an array of longs to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of longs to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readLongArray(java.io.DataInput)
  - readLongArray
```
public static long[] readLongArray(java.io.DataInput in)
                            throws java.io.IOException
```
    Reads an array of longs from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of longs
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeLongArray(long[], java.io.DataOutput)
  - writeFloatArray
```
public static void writeFloatArray(float[] array,
                                   java.io.DataOutput out)
                            throws java.io.IOException
```
    Writes an array of floats to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of floats to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readFloatArray(java.io.DataInput)
  - readFloatArray
```
public static float[] readFloatArray(java.io.DataInput in)
                              throws java.io.IOException
```
    Reads an array of floats from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of floats
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeFloatArray(float[], java.io.DataOutput)
  - writeDoubleArray
```
public static void writeDoubleArray(double[] array,
                                    java.io.DataOutput out)
                             throws java.io.IOException
```
    Writes an array of doubles to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of doubles to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readDoubleArray(java.io.DataInput)
  - readDoubleArray
```
public static double[] readDoubleArray(java.io.DataInput in)
                                throws java.io.IOException
```
    Reads an array of doubles from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of doubles
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    See Also:
    
    writeDoubleArray(double[], java.io.DataOutput)
  - writeObjectArray
```
public static void writeObjectArray(java.lang.Object[] array,
                                    java.io.DataOutput out)
                             throws java.io.IOException
```
    Writes an array of Objects to a DataOutput. This method will serialize a null array and not throw a NullPointerException.
    
    Parameters:
    
    array - the array of Objects to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readObjectArray(java.io.DataInput), writeObject(Object, DataOutput)
  - readObjectArray
```
public static java.lang.Object[] readObjectArray(java.io.DataInput in)
                                          throws java.io.IOException,
                                                 java.lang.ClassNotFoundException
```
    Reads an array of Objects from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of Objects
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - if the class of one of the array's elements cannot be found.
    
    See Also:
    
    writeObjectArray(java.lang.Object[], java.io.DataOutput), readObject(java.io.DataInput)
  - writeArrayOfByteArrays
```
public static void writeArrayOfByteArrays(byte[][] array,
                                          java.io.DataOutput out)
                                   throws java.io.IOException
```
    Writes an array of byte[] to a DataOutput.
    
    Parameters:
    
    array - the array of byte[]s to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out.
  - readArrayOfByteArrays
```
public static byte[][] readArrayOfByteArrays(java.io.DataInput in)
                                      throws java.io.IOException
```
    Reads an array of byte[]s from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized array of byte[]s
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
  - writeArrayList
```
public static void writeArrayList(java.util.ArrayList<?> list,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes an ArrayList to a DataOutput. Note that even though list may be an instance of a subclass of ArrayList, readArrayList will always return an instance of ArrayList, not an instance of the subclass. To preserve the class type of list, writeObject(Object, DataOutput) should be used for data serialization. This method will serialize a null list and not throw a NullPointerException.
    
    Parameters:
    
    list - the ArrayList to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readArrayList(java.io.DataInput)
  - readArrayList
```
public static <E> java.util.ArrayList<E> readArrayList(java.io.DataInput in)
                                                throws java.io.IOException,
                                                       java.lang.ClassNotFoundException
```
    Reads an ArrayList from a DataInput.
    
    Type Parameters:
    
    E - – the type of elements in the list
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized ArrayList
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the ArrayList's elements cannot be found.
    
    See Also:
    
    writeArrayList(java.util.ArrayList<?>, java.io.DataOutput)
  - writeVector
```
public static void writeVector(java.util.Vector<?> list,
                               java.io.DataOutput out)
                        throws java.io.IOException
```
    Writes a Vector to a DataOutput. Note that even though list may be an instance of a subclass of Vector, readVector will always return an instance of Vector, not an instance of the subclass. To preserve the class type of list, writeObject(Object, DataOutput) should be used for data serialization.
    
    Parameters:
    
    list - the Vector to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readVector(java.io.DataInput)
  - readVector
```
public static <E> java.util.Vector<E> readVector(java.io.DataInput in)
                                          throws java.io.IOException,
                                                 java.lang.ClassNotFoundException
```
    Reads a Vector from a DataInput.
    
    Type Parameters:
    
    E - – the type of elements in the vector
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Vector
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the Vector's elements cannot be found.
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeVector(java.util.Vector<?>, java.io.DataOutput)
  - writeStack
```
public static void writeStack(java.util.Stack<?> list,
                              java.io.DataOutput out)
                       throws java.io.IOException
```
    Writes a Stack to a DataOutput. Note that even though list may be an instance of a subclass of Stack, readStack will always return an instance of Stack, not an instance of the subclass. To preserve the class type of list, writeObject(Object, DataOutput) should be used for data serialization.
    
    Parameters:
    
    list - the Stack to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readStack(java.io.DataInput)
  - readStack
```
public static <E> java.util.Stack<E> readStack(java.io.DataInput in)
                                        throws java.io.IOException,
                                               java.lang.ClassNotFoundException
```
    Reads a Stack from a DataInput.
    
    Type Parameters:
    
    E - – the type of elements in the stack
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Stack
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the Stack's elements cannot be found.
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeStack(java.util.Stack<?>, java.io.DataOutput)
  - writeLinkedList
```
public static void writeLinkedList(java.util.LinkedList<?> list,
                                   java.io.DataOutput out)
                            throws java.io.IOException
```
    Writes a LinkedList to a DataOutput. Note that even though list may be an instance of a subclass of LinkedList, readLinkedList will always return an instance of LinkedList, not an instance of the subclass. To preserve the class type of list, writeObject(Object, DataOutput) should be used for data serialization. This method will serialize a null list and not throw a NullPointerException.
    
    Parameters:
    
    list - the LinkedList to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readLinkedList(java.io.DataInput)
  - readLinkedList
```
public static <E> java.util.LinkedList<E> readLinkedList(java.io.DataInput in)
                                                  throws java.io.IOException,
                                                         java.lang.ClassNotFoundException
```
    Reads a LinkedList from a DataInput.
    
    Type Parameters:
    
    E - – the type of elements in the list
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized LinkedList
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the LinkedList's elements cannot be found.
    
    See Also:
    
    writeLinkedList(java.util.LinkedList<?>, java.io.DataOutput)
  - writeHashSet
```
public static void writeHashSet(java.util.HashSet<?> set,
                                java.io.DataOutput out)
                         throws java.io.IOException
```
    Writes a HashSet to a DataOutput. Note that even though set may be an instance of a subclass of HashSet, readHashSet will always return an instance of HashSet, not an instance of the subclass. To preserve the class type of set, writeObject(Object, DataOutput) should be used for data serialization. This method will serialize a null set and not throw a NullPointerException.
    
    Parameters:
    
    set - the HashSet to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readHashSet(java.io.DataInput)
  - readHashSet
```
public static <E> java.util.HashSet<E> readHashSet(java.io.DataInput in)
                                            throws java.io.IOException,
                                                   java.lang.ClassNotFoundException
```
    Reads a HashSet from a DataInput.
    
    Type Parameters:
    
    E - – the type of elements in the set
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized HashSet
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the HashSet's elements cannot be found.
    
    See Also:
    
    writeHashSet(java.util.HashSet<?>, java.io.DataOutput)
  - writeLinkedHashSet
```
public static void writeLinkedHashSet(java.util.LinkedHashSet<?> set,
                                      java.io.DataOutput out)
                               throws java.io.IOException
```
    Writes a LinkedHashSet to a DataOutput. Note that even though set may be an instance of a subclass of LinkedHashSet, readLinkedHashSet will always return an instance of LinkedHashSet, not an instance of the subclass. To preserve the class type of set, writeObject(Object, DataOutput) should be used for data serialization.
    
    Parameters:
    
    set - the LinkedHashSet to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readLinkedHashSet(java.io.DataInput)
  - readLinkedHashSet
```
public static <E> java.util.LinkedHashSet<E> readLinkedHashSet(java.io.DataInput in)
                                                        throws java.io.IOException,
                                                               java.lang.ClassNotFoundException
```
    Reads a LinkedHashSet from a DataInput.
    
    Type Parameters:
    
    E - – the type of elements in the set
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized LinkedHashSet
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the LinkedHashSet's elements cannot be found.
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeLinkedHashSet(java.util.LinkedHashSet<?>, java.io.DataOutput)
  - writeHashMap
```
public static void writeHashMap(java.util.Map<?,?> map,
                                java.io.DataOutput out)
                         throws java.io.IOException
```
    Writes a HashMap to a DataOutput. Note that even though map may be an instance of a subclass of HashMap, readHashMap will always return an instance of HashMap, not an instance of the subclass. To preserve the class type of map, writeObject(Object, DataOutput) should be used for data serialization. This method will serialize a null map and not throw a NullPointerException.
    
    Parameters:
    
    map - the HashMap to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readHashMap(java.io.DataInput)
  - readHashMap
```
public static <K,V> java.util.HashMap<K,V> readHashMap(java.io.DataInput in)
                                                            throws java.io.IOException,
                                                                   java.lang.ClassNotFoundException
```
    Reads a HashMap from a DataInput.
    
    Type Parameters:
    
    K - – the type of keys in the map
    
    V - – the type of mapped values
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized HashMap
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the HashMap's elements cannot be found.
    
    See Also:
    
    writeHashMap(java.util.Map<?, ?>, java.io.DataOutput)
  - writeIdentityHashMap
```
public static void writeIdentityHashMap(java.util.IdentityHashMap<?,?> map,
                                        java.io.DataOutput out)
                                 throws java.io.IOException
```
    Writes an IdentityHashMap to a DataOutput. Note that even though map may be an instance of a subclass of IdentityHashMap, readIdentityHashMap will always return an instance of IdentityHashMap, not an instance of the subclass. To preserve the class type of map, writeObject(Object, DataOutput) should be used for data serialization.
    
    Parameters:
    
    map - the IdentityHashMap to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readIdentityHashMap(java.io.DataInput)
  - readIdentityHashMap
```
public static <K,V> java.util.IdentityHashMap<K,V> readIdentityHashMap(java.io.DataInput in)
                                                                            throws java.io.IOException,
                                                                                   java.lang.ClassNotFoundException
```
    Reads an IdentityHashMap from a DataInput. Note that key identity is not preserved unless the keys belong to a class whose serialization preserves identity.
    
    Type Parameters:
    
    K - – the type of keys in the map
    
    V - – the type of mapped values
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized IdentityHashMap
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the IdentityHashMap's elements cannot be found.
    
    See Also:
    
    writeIdentityHashMap(java.util.IdentityHashMap<?, ?>, java.io.DataOutput)
  - writeConcurrentHashMap
```
public static void writeConcurrentHashMap(java.util.concurrent.ConcurrentHashMap<?,?> map,
                                          java.io.DataOutput out)
                                   throws java.io.IOException
```
    Writes a ConcurrentHashMap to a DataOutput. Note that even though map may be an instance of a subclass of ConcurrentHashMap, readConcurrentHashMap will always return an instance of ConcurrentHashMap, not an instance of the subclass. To preserve the class type of map, writeObject(Object, DataOutput) should be used for data serialization.
    At this time if writeObject(Object, DataOutput) is called with an instance of ConcurrentHashMap then it will be serialized with normal java.io Serialization. So if you want the keys and values of a ConcurrentHashMap to take advantage of GemFire serialization it must be serialized with this method.
    
    Parameters:
    
    map - the ConcurrentHashMap to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 6.6
    
    See Also:
    
    readConcurrentHashMap(java.io.DataInput)
  - readConcurrentHashMap
```
public static <K,V> java.util.concurrent.ConcurrentHashMap<K,V> readConcurrentHashMap(java.io.DataInput in)
                                                                                           throws java.io.IOException,
                                                                                                  java.lang.ClassNotFoundException
```
    Reads a ConcurrentHashMap from a DataInput.
    
    Type Parameters:
    
    K - – the type of keys in the map
    
    V - – the type of mapped values
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized ConcurrentHashMap
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the ConcurrentHashMap's elements cannot be found.
    
    Since:
    
    GemFire 6.6
    
    See Also:
    
    writeConcurrentHashMap(java.util.concurrent.ConcurrentHashMap<?, ?>, java.io.DataOutput)
  - writeHashtable
```
public static void writeHashtable(java.util.Hashtable<?,?> map,
                                  java.io.DataOutput out)
                           throws java.io.IOException
```
    Writes a Hashtable to a DataOutput. Note that even though map may be an instance of a subclass of Hashtable, readHashtable will always return an instance of Hashtable, not an instance of the subclass. To preserve the class type of map, writeObject(Object, DataOutput) should be used for data serialization.
    
    Parameters:
    
    map - the Hashtable to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readHashtable(java.io.DataInput)
  - readHashtable
```
public static <K,V> java.util.Hashtable<K,V> readHashtable(java.io.DataInput in)
                                                                throws java.io.IOException,
                                                                       java.lang.ClassNotFoundException
```
    Reads a Hashtable from a DataInput.
    
    Type Parameters:
    
    K - – the type of keys in the hashtable
    
    V - – the type of values in the hashtable
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Hashtable
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the Hashtable's elements cannot be found.
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeHashtable(java.util.Hashtable<?, ?>, java.io.DataOutput)
  - writeTreeMap
```
public static void writeTreeMap(java.util.TreeMap<?,?> map,
                                java.io.DataOutput out)
                         throws java.io.IOException
```
    Writes a TreeMap to a DataOutput. Note that even though map may be an instance of a subclass of TreeMap, readTreeMap will always return an instance of TreeMap, not an instance of the subclass. To preserve the class type of map, writeObject(Object, DataOutput) should be used for data serialization.
    If the map has a comparator then it must also be serializable.
    
    Parameters:
    
    map - the TreeMap to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    readTreeMap(java.io.DataInput)
  - readTreeMap
```
public static <K,V> java.util.TreeMap<K,V> readTreeMap(java.io.DataInput in)
                                                            throws java.io.IOException,
                                                                   java.lang.ClassNotFoundException
```
    Reads a TreeMap from a DataInput.
    
    Type Parameters:
    
    K - – the type of keys in the map
    
    V - – the type of mapped values
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized TreeMap
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the TreeMap's elements cannot be found.
    
    Since:
    
    GemFire 5.7
    
    See Also:
    
    writeTreeMap(java.util.TreeMap<?, ?>, java.io.DataOutput)
  - writeLinkedHashMap
```
public static void writeLinkedHashMap(java.util.Map<?,?> map,
                                      java.io.DataOutput out)
                               throws java.io.IOException
```
    Writes a LinkedHashMap to a DataOutput. Note that even though map may be an instance of a subclass of LinkedHashMap, readLinkedHashMap will always return an instance of LinkedHashMap, not an instance of the subclass. To preserve the class type of map, writeObject(Object, DataOutput) should be used for data serialization. This method will serialize a null map and not throw a NullPointerException.
    
    Parameters:
    
    map - the LinkedHashMap to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readLinkedHashMap(java.io.DataInput)
  - readLinkedHashMap
```
public static <K,V> java.util.LinkedHashMap<K,V> readLinkedHashMap(java.io.DataInput in)
                                                                        throws java.io.IOException,
                                                                               java.lang.ClassNotFoundException
```
    Reads a LinkedHashMap from a DataInput.
    
    Type Parameters:
    
    K - – the type of keys in the map
    
    V - – the type of mapped values
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized LinkedHashMap
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the HashMap's elements cannot be found.
    
    See Also:
    
    writeLinkedHashMap(java.util.Map<?, ?>, java.io.DataOutput)
  - writeTreeSet
```
public static void writeTreeSet(java.util.TreeSet<?> set,
                                java.io.DataOutput out)
                         throws java.io.IOException
```
    Writes a TreeSet to a DataOutput. Note that even though set may be an instance of a subclass of TreeSet, readTreeSet will always return an instance of TreeSet, not an instance of the subclass. To preserve the class type of set, writeObject(Object, DataOutput) should be used for data serialization.
    If the set has a comparator then it must also be serializable.
    
    Parameters:
    
    set - the TreeSet to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readTreeSet(java.io.DataInput)
  - readTreeSet
```
public static <E> java.util.TreeSet<E> readTreeSet(java.io.DataInput in)
                                            throws java.io.IOException,
                                                   java.lang.ClassNotFoundException
```
    Reads a TreeSet from a DataInput.
    
    Type Parameters:
    
    E - the type contained in the TreeSet
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized TreeSet
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of one of the TreeSet's elements cannot be found.
    
    See Also:
    
    writeTreeSet(java.util.TreeSet<?>, java.io.DataOutput)
  - writeProperties
```
public static void writeProperties(java.util.Properties props,
                                   java.io.DataOutput out)
                            throws java.io.IOException
```
    Writes a Properties to a DataOutput.
    NOTE: The defaults of the specified props are not serialized.
    Note that even though props may be an instance of a subclass of Properties, readProperties will always return an instance of Properties, not an instance of the subclass. To preserve the class type of props, writeObject(Object, DataOutput) should be used for data serialization.
    
    Parameters:
    
    props - the Properties to write
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    See Also:
    
    readProperties(java.io.DataInput)
  - readProperties
```
public static java.util.Properties readProperties(java.io.DataInput in)
                                           throws java.io.IOException,
                                                  java.lang.ClassNotFoundException
```
    Reads a Properties from a DataInput.
    NOTE: the defaults are always empty in the returned Properties.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Properties
    
    Throws:
    
    java.io.IOException - If this serializer cannot read an object from in.
    
    java.lang.ClassNotFoundException - If the class cannot be loaded
    
    See Also:
    
    writeProperties(java.util.Properties, java.io.DataOutput)
  - writeObject
```
public static void writeObject(java.lang.Object o,
                               java.io.DataOutput out,
                               boolean allowJavaSerialization)
                        throws java.io.IOException
```
    Writes an arbitrary object to a DataOutput by serializing it into bytes. Serialization is done with the following steps:
    
    If o is null then GemFire serialize it. Note that NullPointerException is not thrown.
    
    If o is an instance of DataSerializable.Replaceable then call writeObject with what replace returns.
    
    If o is an instance of PdxSerializable then GemFire serialize it as PDX.
    
    If o is an instance of DataSerializable then GemFire serialize it as DataSerializable.
    
    If o is a GemFire instance of PdxInstance then GemFire serialize it as PDX.
    
    If o is a GemFire instance of JsonDocument then GemFire serialize it.
    
    If o is an instance of the classes listed on getSupportedClasses() then GemFire serialize it.
    
    If o is an instance of a class that has a DataSerializer registered for it then GemFire serialize it.
    
    If a PdxSerializer has been registered, and it accepts o then GemFire serialize it. Note that this step includes ReflectionBasedAutoSerializer.
    
    Otherwise if allowJavaSerialization is true, attempt standard Java serialization. Note that once standard Java serialization is used, then it will also be used for all the objects referenced by o even if those objects would normally use GemFire serialization.
    Parameters:
    
    o - the object to write
    
    out - the DataOutput to write to
    
    allowJavaSerialization - If false, then a NotSerializableException is thrown in the case where standard Java serialization would otherwise be used for object o or for any nested sub-object of o. This is used to prevent Java serialization from being used when sending data to a non-Java client
    
    Throws:
    
    java.io.IOException - A problem occurs while writing o to out
    
    See Also:
    
    readObject(DataInput), Instantiator, ObjectOutputStream.writeObject(java.lang.Object)
  - writeObject
```
public static void writeObject(java.lang.Object o,
                               java.io.DataOutput out)
                        throws java.io.IOException
```
    Writes an arbitrary object to a DataOutput by calling writeObject(Object, DataOutput, boolean) with true.
    
    Parameters:
    
    o - the object to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing o to out
    
    See Also:
    
    writeObject(Object, DataOutput, boolean)
  - readObject
```
public static <T> T readObject(java.io.DataInput in)
                        throws java.io.IOException,
                               java.lang.ClassNotFoundException
```
    Reads an arbitrary object from a DataInput. Instances of classes that are not handled specially (such as String, Class, and DataSerializable) are read using standard Java serialization.
    Note that if an object is deserialized using standard Java serialization, its class will be loaded using the current thread's context class loader before the one normally used by Java serialization is consulted.
    
    Type Parameters:
    
    T - the type of the Object to read
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    an arbitrary deserialized object
    
    Throws:
    
    java.io.IOException - A problem occurred while reading from in (may wrap another exception)
    
    java.lang.ClassNotFoundException - The class of an object read from in could not be found
    
    See Also:
    
    writeObject(Object, DataOutput), ObjectInputStream.readObject()
  - register
```
public static DataSerializer register(java.lang.Class<?> c)
```
    Registers a DataSerializer class with the data serialization framework. This method uses reflection to create an instance of the DataSerializer class by invoking its zero-argument constructor.
    The DataSerializer instance will be consulted by the writeObject(Object, DataOutput) and readObject(java.io.DataInput) methods. Note that no two serializers can support the same class.
    This method invokes the DataSerializer instance's getSupportedClasses() method and keeps track of which classes can have their instances serialized by by this data serializer.
    
    Parameters:
    
    c - the DataSerializer class to create and register with the data serialization framework.
    
    Returns:
    
    the registered serializer instance
    
    Throws:
    
    java.lang.IllegalArgumentException - If c does not subclass DataSerializer, if c does not have a zero-argument constructor, if id is 0, if getSupportedClasses returns null or an empty array, if getSupportedClasses returns and array with null elements
    
    java.lang.IllegalStateException - if another serializer instance with id id has already been registered, if another serializer instance that supports one of this instances classes has already been registered, if an attempt is made to support any of the classes reserved by DataSerializer (see getSupportedClasses() for a list).
    
    See Also:
    
    getSupportedClasses()
  - getSupportedClasses
```
public abstract java.lang.Class<?>[] getSupportedClasses()
```
    Returns the Classes whose instances are data serialized by this DataSerializer. This method is invoked when this serializer is registered. This method is not allowed to return null nor an empty array. Only instances whose class name is the same as one of the class names in the result will be serialized by this DataSerializer. Two DataSerializers are not allowed to support the same class. The following classes can not be supported by user defined data serializers since they are all supported by the predefined data serializers:
    
    Class
    String
    Boolean
    Byte
    Character
    Short
    Integer
    Long
    Float
    Double
    File
    BigInteger
    BigDecimal
    InetAddress
    Inet4Address
    Inet6Address
    Timestamp
    ArrayList
    Date
    HashMap
    IdentityHashMap
    HashSet
    Hashtable
    LinkedHashSet
    LinkedList
    Optional
    OptionalInt
    OptionalLong
    OptionalDouble
    Properties
    Stack
    TreeMap
    TreeSet
    UUID
    Vector
    any array class Note: an Object[], with the exception of String[], can be handled by a user defined DataSerializer
    
    any enum class Note: Enum classes other than java.util.concurrent.TimeUnit can be handled by a user defined DataSerializer
    Returns:
    
    the Classes whose instances are data serialized by this DataSerializer
  - toData
```
public abstract boolean toData(java.lang.Object o,
                               java.io.DataOutput out)
                        throws java.io.IOException
```
    Data serializes an object to a DataOutput. It is very important that when performing the "switch" on o's class, your code test for a subclass before it tests for a superclass. Otherwise, the incorrect class id could be written to the serialization stream.
    
    Parameters:
    
    o - The object to data serialize. It will never be null.
    
    out - the DataInput to write to
    
    Returns:
    
    false if this DataSerializer does not know how to data serialize o.
    
    Throws:
    
    java.io.IOException - If this serializer cannot write an object to out.
  - fromData
```
public abstract java.lang.Object fromData(java.io.DataInput in)
                                   throws java.io.IOException,
                                          java.lang.ClassNotFoundException
```
    Reads an object from a DataInput. This implementation must support deserializing everything serialized by the matching toData(java.lang.Object, java.io.DataOutput).
    
    Parameters:
    
    in - the DataInput to write to
    
    Returns:
    
    the deserialized Object
    
    Throws:
    
    java.io.IOException - If this serializer cannot read an object from in.
    
    java.lang.ClassNotFoundException - If the class cannot be loaded
    
    See Also:
    
    toData(java.lang.Object, java.io.DataOutput)
  - getId
```
public abstract int getId()
```
    Returns the id of this DataSerializer.
    Returns an int instead of a byte
    
    Returns:
    
    the id of this DataSerializer
    
    Since:
    
    5.7.
  - equals
```
public boolean equals(java.lang.Object o)
```
    Two DataSerializers are consider to be equal if they have the same id and the same class
    
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - setEventId
```
public void setEventId(java.lang.Object eventId)
```
    For internal use only. Sets the unique eventId of this DataSerializer.
    
    Parameters:
    
    eventId - the unique eventId of this DataSerializer
    
    Since:
    
    GemFire 6.5
  - getEventId
```
public java.lang.Object getEventId()
```
    For internal use only. Returns the unique eventId of this DataSerializer.
    
    Returns:
    
    the unique eventId of this DataSerializer
    
    Since:
    
    GemFire 6.5
  - setContext
```
public void setContext(java.lang.Object context)
```
    For internal use only. Sets the context of this DataSerializer.
    
    Parameters:
    
    context - the context of this DataSerializer
    
    Since:
    
    GemFire 6.5
  - getContext
```
public java.lang.Object getContext()
```
    For internal use only. Returns the context of this DataSerializer.
    
    Returns:
    
    the context of this DataSerializer
    
    Since:
    
    GemFire 6.5
  - writeEnum
```
public static void writeEnum(java.lang.Enum<?> e,
                             java.io.DataOutput out)
                      throws java.io.IOException
```
    Writes the Enum constant to DataOutput. Unlike standard java serialization which serializes both the enum name String and the ordinal, GemFire only serializes the ordinal byte, so for backward compatibility new enum constants should only be added to the end of the enum type.
    Example: DataSerializer.writeEnum(DAY_OF_WEEK.SUN, out);
    
    Parameters:
    
    e - the Enum to serialize
    
    out - the DataInput to write to
    
    Throws:
    
    java.io.IOException - if a problem occurs while writing to out
    
    Since:
    
    GemFire 6.5
    
    See Also:
    
    readEnum(Class, DataInput)
  - readEnum
```
public static <E extends java.lang.Enum<E>> E readEnum(java.lang.Class<E> clazz,
                                                       java.io.DataInput in)
                                                throws java.io.IOException
```
    Reads an Enum constant from DataInput. Unlike standard java serialization which serializes both the enum name String and the ordinal, GemFire only serializes the ordinal byte, so be careful about using the correct enum class. Also, for backward compatibility new enum constants should only be added to the end of the enum type.
    Example: DAY_OF_WEEK d = DataSerializer.readEnum(DAY_OF_WEEK.class, in);
    
    Type Parameters:
    
    E - the type of Enum
    
    Parameters:
    
    clazz - the Enum class to deserialize to
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Enum
    
    Throws:
    
    java.io.IOException - if a problem occurs while reading from in
    
    java.lang.ArrayIndexOutOfBoundsException - if the wrong enum class/enum class with a different version and less enum constants is used
    
    Since:
    
    GemFire 6.5
    
    See Also:
    
    writeEnum(Enum, DataOutput)
  - writeOptional
```
public static <T> void writeOptional(java.util.Optional<T> o,
                                     java.io.DataOutput out)
                              throws java.io.IOException
```
    Writes an Optional to a DataOutput.
    
    Type Parameters:
    
    T - the type of value in the Optional
    
    Parameters:
    
    o - the Optional to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if o is null
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    readOptional(java.io.DataInput)
  - readOptional
```
public static <T> java.util.Optional<T> readOptional(java.io.DataInput in)
                                              throws java.io.IOException,
                                                     java.lang.ClassNotFoundException
```
    Reads an Optional from a DataInput.
    
    Type Parameters:
    
    T - – the type of value in the Optional
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized Optional
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    java.lang.ClassNotFoundException - The class of the Optional's elements cannot be found.
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    writeOptional(java.util.Optional<T>, java.io.DataOutput)
  - writeOptionalInt
```
public static void writeOptionalInt(java.util.OptionalInt o,
                                    java.io.DataOutput out)
                             throws java.io.IOException
```
    Writes an OptionalInt to a DataOutput.
    
    Parameters:
    
    o - the OptionalInt to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if o is null
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    readOptionalInt(java.io.DataInput)
  - readOptionalInt
```
public static java.util.OptionalInt readOptionalInt(java.io.DataInput in)
                                             throws java.io.IOException
```
    Reads an OptionalInt from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized OptionalInt
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    writeOptionalInt(java.util.OptionalInt, java.io.DataOutput)
  - writeOptionalLong
```
public static void writeOptionalLong(java.util.OptionalLong o,
                                     java.io.DataOutput out)
                              throws java.io.IOException
```
    Writes an OptionalLong to a DataOutput.
    
    Parameters:
    
    o - the OptionalLong to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if o is null
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    readOptionalLong(java.io.DataInput)
  - readOptionalLong
```
public static java.util.OptionalLong readOptionalLong(java.io.DataInput in)
                                               throws java.io.IOException
```
    Reads an OptionalLong from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized OptionalLong
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    writeOptionalLong(java.util.OptionalLong, java.io.DataOutput)
  - writeOptionalDouble
```
public static void writeOptionalDouble(java.util.OptionalDouble o,
                                       java.io.DataOutput out)
                                throws java.io.IOException
```
    Writes an OptionalDouble to a DataOutput.
    
    Parameters:
    
    o - the OptionalDouble to write
    
    out - the DataOutput to write to
    
    Throws:
    
    java.io.IOException - A problem occurs while writing to out
    
    java.lang.NullPointerException - if o is null
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    readOptionalDouble(java.io.DataInput)
  - readOptionalDouble
```
public static java.util.OptionalDouble readOptionalDouble(java.io.DataInput in)
                                                   throws java.io.IOException
```
    Reads an OptionalDouble from a DataInput.
    
    Parameters:
    
    in - the DataInput to read from
    
    Returns:
    
    the deserialized OptionalDouble
    
    Throws:
    
    java.io.IOException - A problem occurs while reading from in
    
    Since:
    
    GemFire 10.1
    
    See Also:
    
    writeOptionalDouble(java.util.OptionalDouble, java.io.DataOutput)
  - readOptionalPrimitive
```
protected static <T> T readOptionalPrimitive(java.io.DataInput in)
                                      throws java.io.IOException
```
    Throws:
    
    java.io.IOException

VMware GemFire Java API Reference

Class DataSerializer

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PRESENT

INT

LONG

DOUBLE

TRACE_SERIALIZABLE

DISALLOW_JAVA_SERIALIZATION

Constructor Detail

DataSerializer

Method Detail

writeClass

writeNonPrimitiveClassName

readClass

readNonPrimitiveClassName

writeRegion

readRegion

writeDate

readDate

writeFile

readFile

writeInetAddress

readInetAddress

writeString

readString

writeBoolean

readBoolean

writeCharacter

readCharacter

writeByte

readByte

writeShort

readShort

writeInteger

readInteger

writeLong

readLong

writeFloat

readFloat

writeDouble

readDouble

writePrimitiveBoolean

readPrimitiveBoolean

writePrimitiveByte

readPrimitiveByte

writePrimitiveChar

readPrimitiveChar

writePrimitiveShort

readPrimitiveShort

writeUnsignedByte

readUnsignedByte

writeUnsignedShort

readUnsignedShort

writePrimitiveInt

readPrimitiveInt

writePrimitiveLong

readPrimitiveLong

writePrimitiveFloat

readPrimitiveFloat

writePrimitiveDouble

readPrimitiveDouble

writeByteArray

writeByteArray

writeObjectAsByteArray

readByteArray

writeStringArray

readStringArray

writeShortArray

readShortArray

writeCharArray

readCharArray

writeBooleanArray

readBooleanArray

writeIntArray

readIntArray