Package me.lemire.longcompression

Class LongAs2IntsCodec

java.lang.Object

me.lemire.longcompression.LongAs2IntsCodec

All Implemented Interfaces:

LongCODEC

public class LongAs2IntsCodec
extends Object
implements LongCODEC

A LongCODEC which split each long in a highpart (32 first bits) and a low part (32 last bits).

Author:

Benoit Lacelle

Constructor Summary

Constructors

Constructor	Description
LongAs2IntsCodec()	By default, we expect longs to be slightly above Integer.MAX_VALUE.
LongAs2IntsCodec(IntegerCODEC highPartsCodec, IntegerCODEC lowPartsCodec)

Method Summary

Modifier and Type	Method	Description
void	compress(long[] in, IntWrapper inpos, int inlength, long[] out, IntWrapper outpos)	Compress data from an array to another array.
void	uncompress(long[] in, IntWrapper inpos, int inlength, long[] out, IntWrapper outpos)	inlength is ignored by this codec.

Methods inherited from class java.lang.Object

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

Constructor Details

LongAs2IntsCodec

public LongAs2IntsCodec(IntegerCODEC highPartsCodec,
 IntegerCODEC lowPartsCodec)

LongAs2IntsCodec

public LongAs2IntsCodec()

By default, we expect longs to be slightly above Integer.MAX_VALUE. Hence highParts to be small and positive integers. For lowParts, we rely on IntCompressor default IntegerCODEC

Method Details

compress

public void compress(long[] in,
 IntWrapper inpos,
 int inlength,
 long[] out,
 IntWrapper outpos)

Description copied from interface: LongCODEC

Compress data from an array to another array. Both inpos and outpos are modified to represent how much data was read and written to. If 12 longs (inlength = 12) are compressed to 3 longs, then inpos will be incremented by 12 while outpos will be incremented by 3. We use IntWrapper to pass the values by reference.

Specified by:

compress in interface LongCODEC

Parameters:

in - input array

inpos - where to start reading in the array

inlength - how many longs to compress

out - output array

outpos - where to write in the output array

uncompress

public void uncompress(long[] in,
 IntWrapper inpos,
 int inlength,
 long[] out,
 IntWrapper outpos)

inlength is ignored by this codec. We may rely on it instead of storing the compressedLowPart length

Specified by:

uncompress in interface LongCODEC

Parameters:

in - array containing data in compressed form

inpos - where to start reading in the array

inlength - length of the compressed data (ignored by some schemes)

out - array where to write the uncompressed output

outpos - where to start writing the uncompressed output in out