```
public interface PdxReader
```
A PdxReader will be passed to fromData or PdxSerializer fromData by GemFire during deserialization of a PDX. The domain class needs to deserialize field members using this interface. This interface is implemented by GemFire. Each readXXX call will return the field's value. If the serialized PDX does not contain the named field then a default value will be returned. Standard Java defaults are used. For Objects this is null and for primitives it is 0 or 0.0.
You must read fields in the same order they were written by PdxWriter.
The methods on this interface are not thread safe so do not call them concurrently, on the same instance, from more than one thread.

Since:

GemFire 6.6

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`hasField(java.lang.String fieldName)`	Checks if the named field exists and returns the result.
`boolean`	`isIdentityField(java.lang.String fieldName)`	Checks if the named field was `marked` as an identity field.
`byte[][]`	`readArrayOfByteArrays(java.lang.String fieldName)`	Reads the named field and returns its value.
`boolean`	`readBoolean(java.lang.String fieldName)`	Reads the named field and returns its value.
`boolean[]`	`readBooleanArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`byte`	`readByte(java.lang.String fieldName)`	Reads the named field and returns its value.
`byte[]`	`readByteArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`char`	`readChar(java.lang.String fieldName)`	Reads the named field and returns its value.
`char[]`	`readCharArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`java.util.Date`	`readDate(java.lang.String fieldName)`	Reads the named field and returns its value.
`double`	`readDouble(java.lang.String fieldName)`	Reads the named field and returns its value.
`double[]`	`readDoubleArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`java.lang.Object`	`readField(java.lang.String fieldName)`	Reads the named field and returns its value.
`float`	`readFloat(java.lang.String fieldName)`	Reads the named field and returns its value.
`float[]`	`readFloatArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`int`	`readInt(java.lang.String fieldName)`	Reads the named field and returns its value.
`int[]`	`readIntArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`long`	`readLong(java.lang.String fieldName)`	Reads the named field and returns its value.
`long[]`	`readLongArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`java.lang.Object`	`readObject(java.lang.String fieldName)`	Reads the named field and returns its value.
`java.lang.Object[]`	`readObjectArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`short`	`readShort(java.lang.String fieldName)`	Reads the named field and returns its value.
`short[]`	`readShortArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`java.lang.String`	`readString(java.lang.String fieldName)`	Reads the named field and returns its value.
`java.lang.String[]`	`readStringArray(java.lang.String fieldName)`	Reads the named field and returns its value.
`PdxUnreadFields`	`readUnreadFields()`	This method returns an object that represents all the unread fields which must be passed to `writeUnreadFields` in the toData code.

- Method Detail
  - readChar
```
char readChar(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a char field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readBoolean
```
boolean readBoolean(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a boolean field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readByte
```
byte readByte(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a byte field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readShort
```
short readShort(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a short field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readInt
```
int readInt(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a int field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readLong
```
long readLong(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a long field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readFloat
```
float readFloat(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a float field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readDouble
```
double readDouble(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a double field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readString
```
java.lang.String readString(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxFieldTypeMismatchException - if the named field exists and is not a String field.
    
    PdxSerializationException - if deserialization of the field fails.
  - readObject
```
java.lang.Object readObject(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not an Object field.
  - readCharArray
```
char[] readCharArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a char[] field.
  - readBooleanArray
```
boolean[] readBooleanArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a boolean[] field.
  - readByteArray
```
byte[] readByteArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a byte[] field.
  - readShortArray
```
short[] readShortArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a short[] field.
  - readIntArray
```
int[] readIntArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a int[] field.
  - readLongArray
```
long[] readLongArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a long[] field.
  - readFloatArray
```
float[] readFloatArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a float[] field.
  - readDoubleArray
```
double[] readDoubleArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a double[] field.
  - readStringArray
```
java.lang.String[] readStringArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a String[] field.
  - readObjectArray
```
java.lang.Object[] readObjectArray(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a Object[] field.
  - readArrayOfByteArrays
```
byte[][] readArrayOfByteArrays(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a byte[][] field.
  - readDate
```
java.util.Date readDate(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
    
    PdxFieldTypeMismatchException - if the named field exists and is not a Date field.
  - hasField
```
boolean hasField(java.lang.String fieldName)
```
    Checks if the named field exists and returns the result.
    This can be useful when writing code that handles more than one version of a PDX class.
    
    Parameters:
    
    fieldName - the name of the field to check
    
    Returns:
    
    true if the named field exists; otherwise false
  - isIdentityField
```
boolean isIdentityField(java.lang.String fieldName)
```
    Checks if the named field was marked as an identity field.
    Note that if no fields have been marked then all the fields are used as identity fields even though this method will return false since none of them have been marked.
    
    Parameters:
    
    fieldName - the name of the field to check
    
    Returns:
    
    true if the named field exists and was marked as an identify field; otherwise false
  - readField
```
java.lang.Object readField(java.lang.String fieldName)
```
    Reads the named field and returns its value.
    
    Parameters:
    
    fieldName - the name of the field to read
    
    Returns:
    
    the value of the field if the field exists; otherwise a default value
    
    Throws:
    
    PdxSerializationException - if deserialization of the field fails.
  - readUnreadFields
```
PdxUnreadFields readUnreadFields()
```
    This method returns an object that represents all the unread fields which must be passed to writeUnreadFields in the toData code.
    Note that if setPdxIgnoreUnreadFields or client setPdxIgnoreUnreadFields are set to true then this method will always return an object that has no unread fields.
    
    Returns:
    
    an object that represents the unread fields.

VMware GemFire Java API Reference

Interface PdxReader

Method Summary

Method Detail

readChar

readBoolean

readByte

readShort

readInt

readLong

readFloat

readDouble

readString

readObject

readCharArray

readBooleanArray

readByteArray

readShortArray

readIntArray

readLongArray

readFloatArray

readDoubleArray

readStringArray

readObjectArray

readArrayOfByteArrays

readDate

hasField

isIdentityField

readField

readUnreadFields