Package 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 Details

    • m_compressor

      protected DeltaCompressor m_compressor
      The wrapped DeltaCompressor.

  • Constructor Details

    • FormatAwareCompressor

      public FormatAwareCompressor(DeltaCompressor compressor)
      Construct a FormatAwareCompressor.
      Parameters:
      compressor - the underlying compressor

  • Method Details

    • 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