org.apache.lucene.codecs.lucene84

Class ForDeltaUtil

java.lang.Object

org.apache.lucene.codecs.lucene84.ForDeltaUtil

public class ForDeltaUtil
extends java.lang.Object

Utility class to encode/decode increasing sequences of 128 integers.

Field Summary

Fields

Modifier and Type	Field and Description
private ForUtil	forUtil
private static long[]	IDENTITY_PLUS_ONE

Constructor Summary

Constructors

Constructor and Description
ForDeltaUtil(ForUtil forUtil)

Method Summary

Modifier and Type	Method and Description
(package private) void	decodeAndPrefixSum(DataInput in, long base, long[] longs) Decode deltas, compute the prefix sum and add base to all decoded longs.
(package private) void	encodeDeltas(long[] longs, DataOutput out) Encode deltas of a strictly monotonically increasing sequence of integers.
private static void	prefixSumOfOnes(long[] arr, long base)
(package private) void	skip(DataInput in) Skip a sequence of 128 longs.

Methods inherited from class java.lang.Object

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

Field Detail

IDENTITY_PLUS_ONE

private static final long[] IDENTITY_PLUS_ONE

forUtil

private final ForUtil forUtil

Constructor Detail

ForDeltaUtil

ForDeltaUtil(ForUtil forUtil)

Method Detail

prefixSumOfOnes

private static void prefixSumOfOnes(long[] arr,
                                    long base)

encodeDeltas

void encodeDeltas(long[] longs,
                  DataOutput out)
           throws java.io.IOException

Encode deltas of a strictly monotonically increasing sequence of integers. The provided longs are expected to be deltas between consecutive values.

Throws:

java.io.IOException

decodeAndPrefixSum

void decodeAndPrefixSum(DataInput in,
                        long base,
                        long[] longs)
                 throws java.io.IOException

Decode deltas, compute the prefix sum and add base to all decoded longs.

Throws:

java.io.IOException

skip

void skip(DataInput in)
   throws java.io.IOException

Skip a sequence of 128 longs.

Throws:

java.io.IOException