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com.tangosol.util
Class NullImplementation.NullDeltaCompressor

java.lang.Object
com.tangosol.util.NullImplementation.NullDeltaCompressor

All Implemented Interfaces:

DeltaCompressor

Enclosing class:

NullImplementation

public static class NullImplementation.NullDeltaCompressor

extends java.lang.Object

implements DeltaCompressor

An implementation of a DeltaCompressor that does nothing and always returns the new stream.

Field Summary

static DeltaCompressor

INSTANCE Singleton instance.

Constructor Summary

NullImplementation.NullDeltaCompressor()

Method Summary

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.

Field Detail

INSTANCE

public static final DeltaCompressor INSTANCE

Singleton instance.

Constructor Detail

NullImplementation.NullDeltaCompressor

public NullImplementation.NullDeltaCompressor()

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 DeltaCompressor.extractDelta(com.tangosol.io.ReadBuffer, com.tangosol.io.ReadBuffer) to apply to the old value

Returns:

the new value

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