Module org.apache.lucene.backward_codecs

Package org.apache.lucene.backward_codecs.packed

Class LegacyDirectMonotonicWriter

java.lang.Object

org.apache.lucene.backward_codecs.packed.LegacyDirectMonotonicWriter

public final class LegacyDirectMonotonicWriter
extends Object

Write monotonically-increasing sequences of integers. This writer splits data into blocks and then for each block, computes the average slope, the minimum value and only encode the delta from the expected value using a LegacyDirectWriter.

See Also:

• LegacyDirectMonotonicReader

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final long	baseDataPointer
(package private) final long[]	buffer
(package private) int	bufferSize
(package private) long	count
(package private) final IndexOutput	data
(package private) boolean	finished
static final int	MAX_BLOCK_SHIFT	max block shift
(package private) final IndexOutput	meta
static final int	MIN_BLOCK_SHIFT	min block shift
(package private) final long	numValues
(package private) long	previous

Constructor Summary

Constructors

Constructor	Description
LegacyDirectMonotonicWriter(IndexOutput metaOut, IndexOutput dataOut, long numValues, int blockShift)

Method Summary

Modifier and Type	Method	Description
void	add(long v)	Write a new value.
void	finish()	This must be called exactly once after all values have been added.
private void	flush()
static LegacyDirectMonotonicWriter	getInstance(IndexOutput metaOut, IndexOutput dataOut, long numValues, int blockShift)	Returns an instance suitable for encoding numValues into monotonic blocks of 2blockShift values.

Methods inherited from class java.lang.Object

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

Field Details

MIN_BLOCK_SHIFT

public static final int MIN_BLOCK_SHIFT

min block shift

See Also:

• Constant Field Values

MAX_BLOCK_SHIFT

public static final int MAX_BLOCK_SHIFT

max block shift

See Also:

• Constant Field Values

meta

final IndexOutput meta

data

final IndexOutput data

numValues

final long numValues

baseDataPointer

final long baseDataPointer

buffer

final long[] buffer

bufferSize

int bufferSize

count

long count

finished

boolean finished

previous

long previous

Constructor Details

LegacyDirectMonotonicWriter

LegacyDirectMonotonicWriter(IndexOutput metaOut,
 IndexOutput dataOut,
 long numValues,
 int blockShift)

Method Details

flush

private void flush()
            throws IOException

Throws:

IOException

add

public void add(long v)
         throws IOException

Write a new value. Note that data might not make it to storage until finish() is called.

Throws:

IllegalArgumentException - if values don't come in order

IOException

finish

public void finish()
            throws IOException

This must be called exactly once after all values have been added.

Throws:

IOException

getInstance

public static LegacyDirectMonotonicWriter getInstance(IndexOutput metaOut,
 IndexOutput dataOut,
 long numValues,
 int blockShift)

Returns an instance suitable for encoding numValues into monotonic blocks of 2^blockShift values. Metadata will be written to metaOut and actual data to dataOut.