com.kamikaze.pfordelta

Class Simple16

java.lang.Object

com.kamikaze.pfordelta.Simple16

public class Simple16
extends Object

Implementation of the Simple16 algorithm for sorted integer arrays. The basic ideas are based on papers from 1. http://www2008.org/papers/pdf/p387-zhangA.pdf 2. http://www2009.org/proceedings/pdf/p401.pdf The maximum possible integer value Simple16 can encode is less than 2^28 (this is dertermined by the Simple16 algorithm itself). Therefore, in order to use Simple16, the application must write their own code to encode numbers in the range of [2^28, 2^32). A simple way is just write those numbers as 32-bit integers (that is, no compression for very big numbers).

Constructor Summary

Constructors

Constructor and Description
Simple16()

Method Summary

Modifier and Type	Method and Description
static int	s16Compress(int[] out, int outOffset, int[] in, int inOffset, int n, int blockSize) Compress an integer array using Simple16
static int	s16Decompress(int[] out, int outOffset, int[] in, int inOffset, int n) Decompress an integer array using Simple16

Methods inherited from class java.lang.Object

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

Constructor Detail

Simple16

public Simple16()

Method Detail

s16Compress

public static final int s16Compress(int[] out,
                                    int outOffset,
                                    int[] in,
                                    int inOffset,
                                    int n,
                                    int blockSize)

Compress an integer array using Simple16

Parameters:

out - the compressed output

outOffset - the offset of the output in the number of integers

in - the integer input array

inOffset - the offset of the input in the number of integers

n - the number of elements to be compressed

blockSize - block size

Returns:

the number of compressed integers

s16Decompress

public static final int s16Decompress(int[] out,
                                      int outOffset,
                                      int[] in,
                                      int inOffset,
                                      int n)

Decompress an integer array using Simple16

Parameters:

out - the decompressed output

outOffset - the offset of the output in the number of integers

in - the compressed input array

inOffset - the offset of the input in the number of integers

n - the number of elements to be compressed

Returns:

the number of processed integers