package FlexibleEncoding.Parquet;
/*
* adapted from Parquet*
*/
/**
* Packs and unpacks into ints
*
* packing unpacking treats:
* - 32 values at a time
* - bitWidth ints at a time.
*
* @author Julien Le Dem
*
*/
public abstract class IntPacker {
private final int bitWidth;
IntPacker(int bitWidth) {
this.bitWidth = bitWidth;
}
/**
* @return the width in bits used for encoding, also how many ints are packed/unpacked at a time
*/
public final int getBitWidth() {
return bitWidth;
}
/**
* pack 32 values from input at inPos into bitWidth ints in output at outPos.
* nextPosition: inPos += 32; outPos += getBitWidth()
* @param input the input values
* @param inPos where to read from in input
* @param output the output ints
* @param outPos where to write to in output
*/
public abstract void pack32Values(int[] input, int inPos, int[] output, int outPos);
/**
* unpack bitWidth ints from input at inPos into 32 values in output at outPos.
* nextPosition: inPos += getBitWidth(); outPos += 32
* @param input the input int
* @param inPos where to read from in input
* @param output the output values
* @param outPos where to write to in output
*/
public abstract void unpack32Values(int[] input, int inPos, int[] output, int outPos);
}