com.tangosol.util

Class ExternalizableHelper.FormatAwareCompressor

java.lang.Object

com.tangosol.util.ExternalizableHelper.FormatAwareCompressor

All Implemented Interfaces:

DeltaCompressor

Enclosing class:

ExternalizableHelper

public static class ExternalizableHelper.FormatAwareCompressor
extends Object
implements DeltaCompressor

A DeltaCompressor wrapper implementation that removes/replaces the serialization format byte (FMT_EXT) before/after delegating to the underlying compressor.

Field Summary

Fields

Modifier and Type	Field and Description
protected DeltaCompressor	m_compressor The wrapped DeltaCompressor.

Constructor Summary

Constructors

Constructor and Description
FormatAwareCompressor(DeltaCompressor compressor) Construct a FormatAwareCompressor.

Method Summary

Modifier and Type	Method and Description
ReadBuffer	applyDelta(ReadBuffer bufOld, ReadBuffer bufDelta) Apply a delta to an old value in order to create a new value.
ReadBuffer	extractDelta(ReadBuffer bufOld, ReadBuffer bufNew) Compare an old value to a new value and generate a delta that represents the changes that must be made to the old value in order to transform it into the new value.
String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

m_compressor

protected DeltaCompressor m_compressor

The wrapped DeltaCompressor.

Constructor Detail

FormatAwareCompressor

public FormatAwareCompressor(DeltaCompressor compressor)

Construct a FormatAwareCompressor.

Parameters:

compressor - the underlying compressor

Method Detail

extractDelta

public ReadBuffer extractDelta(ReadBuffer bufOld,
                               ReadBuffer bufNew)

Compare an old value to a new value and generate a delta that represents the changes that must be made to the old value in order to transform it into the new value. The generated delta must be a ReadBuffer of non-zero length.

If the old value is null, the generated delta must be a "replace", meaning that applying it to any value must produce the specified new value.

Specified by:

extractDelta in interface DeltaCompressor

Parameters:

bufOld - the old value

bufNew - the new value; must not be null

Returns:

the changes that must be made to the old value in order to transform it into the new value, or null to indicate no change

applyDelta

public ReadBuffer applyDelta(ReadBuffer bufOld,
                             ReadBuffer bufDelta)

Apply a delta to an old value in order to create a new value.

Specified by:

applyDelta in interface DeltaCompressor

Parameters:

bufOld - the old value

bufDelta - the delta information returned from extractDelta(com.tangosol.io.ReadBuffer, com.tangosol.io.ReadBuffer) to apply to the old value

Returns:

the new value

toString

public String toString()

Returns a string representation of the object.

Overrides:

toString in class Object

Returns:

a string representation of the object