Module org.apache.lucene.core

Package org.apache.lucene.util.bkd

Class BKDReader

java.lang.Object

org.apache.lucene.index.PointValues

org.apache.lucene.util.bkd.BKDReader

public class BKDReader
extends PointValues

Handles reading a block KD-tree in byte[] space previously written with BKDWriter.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	BKDReader.BKDPointTree
private static class	BKDReader.BKDReaderDocIDSetIterator	Reusable DocIdSetIterator to handle low cardinality leaves.

Nested classes/interfaces inherited from class org.apache.lucene.index.PointValues

PointValues.IntersectVisitor, PointValues.PointTree, PointValues.Relation

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final BKDConfig	config
(package private) final int	docCount
(package private) final IndexInput	in
private final boolean	isTreeBalanced
(package private) final byte[]	maxPackedValue
(package private) final long	minLeafBlockFP
(package private) final byte[]	minPackedValue
(package private) final int	numLeaves
(package private) final IndexInput	packedIndex
(package private) final long	pointCount
(package private) final int	version

Fields inherited from class org.apache.lucene.index.PointValues

MAX_DIMENSIONS, MAX_INDEX_DIMENSIONS, MAX_NUM_BYTES

Constructor Summary

Constructors

Constructor	Description
BKDReader(IndexInput metaIn, IndexInput indexIn, IndexInput dataIn)	Caller must pre-seek the provided IndexInput to the index location that BKDWriter.finish(org.apache.lucene.store.IndexOutput, org.apache.lucene.store.IndexOutput, org.apache.lucene.store.IndexOutput) returned.

Method Summary

Modifier and Type	Method	Description
int	getBytesPerDimension()	Returns the number of bytes per dimension
int	getDocCount()	Returns the total number of documents that have indexed at least one point.
byte[]	getMaxPackedValue()	Returns maximum value for each dimension, packed, or null if PointValues.size(org.apache.lucene.index.IndexReader, java.lang.String) is 0
byte[]	getMinPackedValue()	Returns minimum value for each dimension, packed, or null if PointValues.size(org.apache.lucene.index.IndexReader, java.lang.String) is 0
int	getNumDimensions()	Returns how many dimensions are represented in the values
int	getNumIndexDimensions()	Returns how many dimensions are used for the index
PointValues.PointTree	getPointTree()	Create a new PointValues.PointTree to navigate the index
private boolean	isTreeBalanced()
long	size()	Returns the total number of indexed points across all documents.

Methods inherited from class org.apache.lucene.index.PointValues

estimateDocCount, estimatePointCount, getDocCount, getMaxPackedValue, getMinPackedValue, intersect, isEstimatedPointCountGreaterThanOrEqualTo, size

Methods inherited from class java.lang.Object

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

Field Details

config

final BKDConfig config

numLeaves

final int numLeaves

in

final IndexInput in

minPackedValue

final byte[] minPackedValue

maxPackedValue

final byte[] maxPackedValue

pointCount

final long pointCount

docCount

final int docCount

version

final int version

minLeafBlockFP

final long minLeafBlockFP

packedIndex

final IndexInput packedIndex

isTreeBalanced

private final boolean isTreeBalanced

Constructor Details

BKDReader

public BKDReader(IndexInput metaIn,
 IndexInput indexIn,
 IndexInput dataIn)
          throws IOException

Caller must pre-seek the provided IndexInput to the index location that BKDWriter.finish(org.apache.lucene.store.IndexOutput, org.apache.lucene.store.IndexOutput, org.apache.lucene.store.IndexOutput) returned. BKD tree is always stored off-heap.

Throws:

IOException

Method Details

isTreeBalanced

private boolean isTreeBalanced()
                        throws IOException

Throws:

IOException

getPointTree

public PointValues.PointTree getPointTree()
                                   throws IOException

Description copied from class: PointValues

Create a new PointValues.PointTree to navigate the index

Specified by:

getPointTree in class PointValues

Throws:

IOException

getMinPackedValue

public byte[] getMinPackedValue()

Description copied from class: PointValues

Returns minimum value for each dimension, packed, or null if PointValues.size(org.apache.lucene.index.IndexReader, java.lang.String) is 0

Specified by:

getMinPackedValue in class PointValues

getMaxPackedValue

public byte[] getMaxPackedValue()

Description copied from class: PointValues

Returns maximum value for each dimension, packed, or null if PointValues.size(org.apache.lucene.index.IndexReader, java.lang.String) is 0

Specified by:

getMaxPackedValue in class PointValues

getNumDimensions

public int getNumDimensions()
                     throws IOException

Description copied from class: PointValues

Returns how many dimensions are represented in the values

Specified by:

getNumDimensions in class PointValues

Throws:

IOException

getNumIndexDimensions

public int getNumIndexDimensions()
                          throws IOException

Description copied from class: PointValues

Returns how many dimensions are used for the index

Specified by:

getNumIndexDimensions in class PointValues

Throws:

IOException

getBytesPerDimension

public int getBytesPerDimension()
                         throws IOException

Description copied from class: PointValues

Returns the number of bytes per dimension

Specified by:

getBytesPerDimension in class PointValues

Throws:

IOException

size

public long size()

Description copied from class: PointValues

Returns the total number of indexed points across all documents.

Specified by:

size in class PointValues

getDocCount

public int getDocCount()

Description copied from class: PointValues

Returns the total number of documents that have indexed at least one point.

Specified by:

getDocCount in class PointValues