Field Detail

• COMPRESSION_BYTE_BUFFER_LENGTH

  public static final int COMPRESSION_BYTE_BUFFER_LENGTH

  See Also:

  Constant Field Values

Constructor Detail

• CompressionDescriptor

  public CompressionDescriptor()

• CompressionDescriptor

  public CompressionDescriptor(DataBuffer buffer)

  Create a compression descriptor from the given data buffer elements

  Parameters:

  buffer - the databuffer to create the compression descriptor from

• CompressionDescriptor

  public CompressionDescriptor(DataBuffer buffer,
                               String algorithm)

  Initialize a compression descriptor based on the given algorithm and data buffer

  Parameters:

  buffer - the data buffer to base the sizes off of

  algorithm - the algorithm used in the descriptor

• CompressionDescriptor

  public CompressionDescriptor(DataBuffer buffer,
                               NDArrayCompressor compressor)

  Initialize a compression descriptor based on the given data buffer (for the sizes) and the compressor to get the opType

  Parameters:

  buffer -

  compressor -

Method Detail

• fromByteBuffer

  public static CompressionDescriptor fromByteBuffer(ByteBuffer byteBuffer)

  Instantiate a compression descriptor from the given bytebuffer

  Parameters:

  byteBuffer - the bytebuffer to instantiate the descriptor from

  Returns:

  the instantiated descriptor based on the given bytebuffer

• toByteBuffer

  public ByteBuffer toByteBuffer()

  Return a direct allocated bytebuffer from the compression codec. The size of the bytebuffer is calculated to be: 40: 8 + 32 two ints representing their enum values for the compression algorithm and opType and 4 longs for the compressed and original sizes

  Returns:

  the bytebuffer described above

• clone

  public CompressionDescriptor clone()

  Overrides:

  clone in class Object