Oracle® Coherence Java API Reference
v3.5

E14977-01

com.tangosol.util.transformer
Class SemiLiteEventTransformer

java.lang.Object
  extended by com.tangosol.util.Base
      extended by com.tangosol.util.BitHelper
          extended by com.tangosol.util.ExternalizableHelper
              extended by 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

Oracle® Coherence Java API Reference
v3.5

E14977-01

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