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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, 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. <p/> 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(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(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.
String	toString() Provide a human-readable representation of this object.
MapEvent	transform(MapEvent event) Remove an old value from the specified MapEvent.
void	writeExternal(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(DataInput in)
                  throws 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:

IOException - if an I/O exception occurs

NotActiveException - if the object is not in its initial state, and therefore cannot be deserialized into

writeExternal

public void writeExternal(DataOutput out)
                   throws 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:

IOException - if an I/O exception occurs

readExternal

public void readExternal(PofReader in)
                  throws 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:

IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter out)
                   throws 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:

IOException - if an I/O error occurs

equals

public boolean equals(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 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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