org.elasticsearch.common.compress.lzf.impl
Class UnsafeChunkDecoder

java.lang.Object
  org.elasticsearch.common.compress.lzf.ChunkDecoder
      org.elasticsearch.common.compress.lzf.impl.UnsafeChunkDecoder

public class UnsafeChunkDecoder
extends ChunkDecoder

Highly optimized ChunkDecoder implementation that uses Sun JDK's Unsafe class (which may be included by other JDK's as well; IBM's apparently does).

Credits for the idea go to Dain Sundstrom, who kindly suggested this use, and is all-around great source for optimization tips and tricks.

Field Summary

Fields inherited from class org.elasticsearch.common.compress.lzf.ChunkDecoder

BYTE_NULL, HEADER_BYTES

Constructor Summary

UnsafeChunkDecoder()

Method Summary

void	decodeChunk(byte[] in, int inPos, byte[] out, int outPos, int outEnd) Main decode method for individual chunks.
int	decodeChunk(java.io.InputStream is, byte[] inputBuffer, byte[] outputBuffer) Main decode from a stream.

Methods inherited from class org.elasticsearch.common.compress.lzf.ChunkDecoder

calculateUncompressedSize, decode, decode, decode, decode, readFully, readHeader, uint16

Methods inherited from class java.lang.Object

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

Constructor Detail

UnsafeChunkDecoder

public UnsafeChunkDecoder()

Method Detail

decodeChunk

public final int decodeChunk(java.io.InputStream is,
                             byte[] inputBuffer,
                             byte[] outputBuffer)
                      throws java.io.IOException

Description copied from class: ChunkDecoder

Main decode from a stream. Decompressed bytes are placed in the outputBuffer, inputBuffer is a "scratch-area".

Specified by:

decodeChunk in class ChunkDecoder

Parameters:

is - An input stream of LZF compressed bytes

inputBuffer - A byte array used as a scratch area.

outputBuffer - A byte array in which the result is returned

Returns:

The number of bytes placed in the outputBuffer.

Throws:

java.io.IOException

decodeChunk

public final void decodeChunk(byte[] in,
                              int inPos,
                              byte[] out,
                              int outPos,
                              int outEnd)
                       throws java.io.IOException

Description copied from class: ChunkDecoder

Main decode method for individual chunks.

Specified by:

decodeChunk in class ChunkDecoder

Throws:

java.io.IOException