org.apache.lucene.util.bkd

Class BKDReader

java.lang.Object

org.apache.lucene.index.PointValues

org.apache.lucene.util.bkd.BKDReader

public final class BKDReader
extends PointValues

Handles intersection of an multi-dimensional shape in byte[] space with a block KD-tree previously written with BKDWriter.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	BKDReader.BKDReaderDocIDSetIterator Reusable DocIdSetIterator to handle low cardinality leaves.
class	BKDReader.IndexTree Used to walk the off-heap index.
static class	BKDReader.IntersectState Used to track all state for a single call to intersect(org.apache.lucene.index.PointValues.IntersectVisitor).

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

PointValues.IntersectVisitor, PointValues.Relation

Field Summary

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

MAX_DIMENSIONS, MAX_INDEX_DIMENSIONS, MAX_NUM_BYTES

Constructor Summary

Constructors

Constructor and 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 and Description
long	estimatePointCount(PointValues.IntersectVisitor visitor) Estimate the number of points that would be visited by PointValues.intersect(org.apache.lucene.index.PointValues.IntersectVisitor) with the given PointValues.IntersectVisitor.
int	getBytesPerDimension() Returns the number of bytes per dimension
int	getDocCount() Returns the total number of documents that have indexed at least one point.
BKDReader.IntersectState	getIntersectState(PointValues.IntersectVisitor visitor) Create a new BKDReader.IntersectState
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
void	intersect(PointValues.IntersectVisitor visitor) Finds all documents and points matching the provided visitor.
boolean	isLeafNode(int nodeID)
long	size() Returns the total number of indexed points across all documents.
void	visitLeafBlockValues(BKDReader.IndexTree index, BKDReader.IntersectState state) Visits all docIDs and packed values in a single leaf block

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

estimateDocCount, getDocCount, getMaxPackedValue, getMinPackedValue, size

Methods inherited from class java.lang.Object

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

Constructor Detail

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 Detail

intersect

public void intersect(PointValues.IntersectVisitor visitor)
               throws IOException

Description copied from class: PointValues

Finds all documents and points matching the provided visitor. This method does not enforce live documents, so it's up to the caller to test whether each document is deleted, if necessary.

Specified by:

intersect in class PointValues

Throws:

IOException

estimatePointCount

public long estimatePointCount(PointValues.IntersectVisitor visitor)

Description copied from class: PointValues

Estimate the number of points that would be visited by PointValues.intersect(org.apache.lucene.index.PointValues.IntersectVisitor) with the given PointValues.IntersectVisitor. This should run many times faster than PointValues.intersect(IntersectVisitor).

Specified by:

estimatePointCount in class PointValues

getIntersectState

public BKDReader.IntersectState getIntersectState(PointValues.IntersectVisitor visitor)

Create a new BKDReader.IntersectState

visitLeafBlockValues

public void visitLeafBlockValues(BKDReader.IndexTree index,
                                 BKDReader.IntersectState state)
                          throws IOException

Visits all docIDs and packed values in a single leaf block

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()

Description copied from class: PointValues

Returns how many dimensions are represented in the values

Specified by:

getNumDimensions in class PointValues

getNumIndexDimensions

public int getNumIndexDimensions()

Description copied from class: PointValues

Returns how many dimensions are used for the index

Specified by:

getNumIndexDimensions in class PointValues

getBytesPerDimension

public int getBytesPerDimension()

Description copied from class: PointValues

Returns the number of bytes per dimension

Specified by:

getBytesPerDimension in class PointValues

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

isLeafNode

public boolean isLeafNode(int nodeID)