org.terrier.compression.integer.codec

Class VIntCodec

java.lang.Object

org.terrier.compression.integer.codec.IntegerCodec

org.terrier.compression.integer.codec.VIntCodec

public final class VIntCodec
extends IntegerCodec

IntegerCoding implementation which uses Varible byte encoding. It leverages Hadoop VInt functions.

Since:

4.0

Author:

Matteo Catena

Field Summary

Fields inherited from class org.terrier.compression.integer.codec.IntegerCodec

inBuffer, outBuffer, supportArray

Constructor Summary

Constructors

Constructor and Description
VIntCodec()

Method Summary

Methods

Modifier and Type	Method and Description
void	compress(int[] in, int len, ByteOut out) Compress and write down an integer array
void	compress(long[] in, int len, ByteOut out)
void	decompress(ByteIn in, int[] out, int num) Read and decompress an integer array
void	decompress(ByteIn in, long[] out, int num)
void	skip(ByteIn in) avoid to decompress the next block (the size of the block is written on the input stream)

Methods inherited from class org.terrier.compression.integer.codec.IntegerCodec

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

VIntCodec

public VIntCodec()

Method Detail

compress

public final void compress(int[] in,
            int len,
            ByteOut out)
                    throws IOException

Description copied from class: IntegerCodec

Compress and write down an integer array

Specified by:

compress in class IntegerCodec

Parameters:

in - the array to compress

len - number of in's elements to compress

out - the output channel

Throws:

IOException

decompress

public final void decompress(ByteIn in,
              int[] out,
              int num)
                      throws IOException

Description copied from class: IntegerCodec

Read and decompress an integer array

Specified by:

decompress in class IntegerCodec

Parameters:

in - the input channel

out - the decompressed array

num - expected number of decompressed elements

Throws:

IOException

compress

public void compress(long[] in,
            int len,
            ByteOut out)
              throws IOException

Throws:

IOException

decompress

public void decompress(ByteIn in,
              long[] out,
              int num)
                throws IOException

Throws:

IOException

skip

public final void skip(ByteIn in)
                throws IOException

Description copied from class: IntegerCodec

avoid to decompress the next block (the size of the block is written on the input stream)

Specified by:

skip in class IntegerCodec

Parameters:

in - the input channel

Throws:

IOException