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Oracle® Coherence Java API Reference
v3.5.3
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## com.tangosol.util.transformer
Class SemiLiteEventTransformer

    java.lang.Object
      com.tangosol.util.Base
          com.tangosol.util.BitHelper
              com.tangosol.util.ExternalizableHelper
                  com.tangosol.util.transformer.SemiLiteEventTransformer

All Implemented Interfaces:
  ExternalizableLite, PortableObject, MapEventTransformer, java.io.Serializable

    public class SemiLiteEventTransformer

extends ExternalizableHelper
implements MapEventTransformer, ExternalizableLite, PortableObject

SemiLiteEventTransformer is a special purpose MapEventTransformer implementation that removes an OldValue from the MapEvent object for the purpose of reducing the amount of data that has to be sent over the network to event consumers.

Usage example:

        cache.addMapListener(listener, new MapEventTransformerFilter(null,
            SemiLiteEventTransformer.INSTANCE), false);

Since:
  Coherence 3.4
Author:
  gg/jh 2008.05.01

Field Summary
`static SemiLiteEventTransformer` | `INSTANCE` The SemiLiteEventTransformer singleton.

Constructor Summary
`SemiLiteEventTransformer()` No-argument constructor for lite deserialization.

Method Summary
`boolean` | `equals(java.lang.Object o)` Compare the SemiLiteEventTransformer with another object to determine equality.
`int` | `hashCode()` Determine a hash value for the SemiLiteEventTransformer object according to the general `Object.hashCode()` contract.
`void` | `readExternal(java.io.DataInput in)` Restore the contents of this object by loading the object's state from the passed DataInput object.
`void` | `readExternal(PofReader in)` Restore the contents of a user type instance by reading its state using the specified PofReader object.
`java.lang.String` | `toString()` Provide a human-readable representation of this object.
`MapEvent` | `transform(MapEvent event)` Remove an old value from the specified MapEvent.
`void` | `writeExternal(java.io.DataOutput out)` Save the contents of this object by storing the object's state into the passed DataOutput object.
`void` | `writeExternal(PofWriter out)` Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Methods inherited from class com.tangosol.util.BitHelper
`countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString`

Field Detail

### INSTANCE

    public static final SemiLiteEventTransformer INSTANCE

  The SemiLiteEventTransformer singleton.

Constructor Detail

### SemiLiteEventTransformer

    public SemiLiteEventTransformer()

  No-argument constructor for lite deserialization.

Method Detail

### transform

    public MapEvent transform(MapEvent event)

  Remove an old value from the specified MapEvent.

  Specified by:
    `transform` in interface `MapEventTransformer`
  Parameters:
    `event` - the original MapEvent object
  Returns:
    modified MapEvent object that does not contain the old value

### readExternal

    public void readExternal(java.io.DataInput in)
                      throws java.io.IOException

  Restore the contents of this object by loading the object's state from the passed DataInput object.

  Specified by:
    `readExternal` in interface `ExternalizableLite`
  Parameters:
    `in` - the DataInput stream to read data from in order to restore the state of this object
  Throws:
    `java.io.IOException` - if an I/O exception occurs
    `java.io.NotActiveException` - if the object is not in its initial state, and therefore cannot be deserialized into

### writeExternal

    public void writeExternal(java.io.DataOutput out)
                       throws java.io.IOException

  Save the contents of this object by storing the object's state into the passed DataOutput object.

  Specified by:
    `writeExternal` in interface `ExternalizableLite`
  Parameters:
    `out` - the DataOutput stream to write the state of this object to
  Throws:
    `java.io.IOException` - if an I/O exception occurs

### readExternal

    public void readExternal(PofReader in)
                      throws java.io.IOException

  Restore the contents of a user type instance by reading its state using the specified PofReader object.

  Specified by:
    `readExternal` in interface `PortableObject`
  Parameters:
    `in` - the PofReader from which to read the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

### writeExternal

    public void writeExternal(PofWriter out)
                       throws java.io.IOException

  Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

  Specified by:
    `writeExternal` in interface `PortableObject`
  Parameters:
    `out` - the PofWriter to which to write the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

### equals

    public boolean equals(java.lang.Object o)

  Compare the SemiLiteEventTransformer with another object to determine equality.

  Returns:
    true iff this SemiLiteEventTransformer and the passed object are equivalent

### hashCode

    public int hashCode()

  Determine a hash value for the SemiLiteEventTransformer object according to the general `Object.hashCode()` contract.

  Returns:
    an integer hash value for this object

### toString

    public java.lang.String toString()

  Provide a human-readable representation of this object.

  Returns:
    a String whose contents represent the value of this object

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Oracle® Coherence Java API Reference
v3.5.3
E15583-01
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