org.apache.lucene.spatial.prefix

Class WithinPrefixTreeQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.spatial.prefix.AbstractPrefixTreeQuery

org.apache.lucene.spatial.prefix.AbstractVisitingPrefixTreeQuery

org.apache.lucene.spatial.prefix.WithinPrefixTreeQuery

public class WithinPrefixTreeQuery
extends AbstractVisitingPrefixTreeQuery

Finds docs where its indexed shape is WITHIN the query shape. It works by looking at cells outside of the query shape to ensure documents there are excluded. By default, it will examine all cells, and it's fairly slow. If you know that the indexed shapes are never comprised of multiple disjoint parts (which also means it is not multi-valued), then you can pass SpatialPrefixTree.getDistanceForLevel(maxLevels) as the queryBuffer constructor parameter to minimally look this distance beyond the query shape's edge. Even if the indexed shapes are sometimes comprised of multiple disjoint parts, you might want to use this option with a large buffer as a faster approximation with minimal false-positives.

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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.spatial.prefix.AbstractVisitingPrefixTreeQuery

AbstractVisitingPrefixTreeQuery.VisitorTemplate, AbstractVisitingPrefixTreeQuery.VNode

Nested classes/interfaces inherited from class org.apache.lucene.spatial.prefix.AbstractPrefixTreeQuery

AbstractPrefixTreeQuery.BaseTermsEnumTraverser

Field Summary

Fields inherited from class org.apache.lucene.spatial.prefix.AbstractVisitingPrefixTreeQuery

prefixGridScanLevel

Fields inherited from class org.apache.lucene.spatial.prefix.AbstractPrefixTreeQuery

detailLevel, fieldName, grid, queryShape

Constructor Summary

Constructors

Constructor and Description
WithinPrefixTreeQuery(org.locationtech.spatial4j.shape.Shape queryShape, String fieldName, SpatialPrefixTree grid, int detailLevel, int prefixGridScanLevel, double queryBuffer) See AbstractVisitingPrefixTreeQuery.AbstractVisitingPrefixTreeQuery(org.locationtech.spatial4j.shape.Shape, String, org.apache.lucene.spatial.prefix.tree.SpatialPrefixTree, int, int).

Method Summary

Modifier and Type	Method and Description
protected org.locationtech.spatial4j.shape.Shape	bufferShape(org.locationtech.spatial4j.shape.Shape shape, double distErr) Returns a new shape that is larger than shape by at distErr.
boolean	equals(Object o)
protected DocIdSet	getDocIdSet(LeafReaderContext context)
int	hashCode()
String	toString(String field)

Methods inherited from class org.apache.lucene.spatial.prefix.AbstractPrefixTreeQuery

createWeight, visit

Methods inherited from class org.apache.lucene.search.Query

classHash, rewrite, sameClassAs, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

WithinPrefixTreeQuery

public WithinPrefixTreeQuery(org.locationtech.spatial4j.shape.Shape queryShape,
                             String fieldName,
                             SpatialPrefixTree grid,
                             int detailLevel,
                             int prefixGridScanLevel,
                             double queryBuffer)

See AbstractVisitingPrefixTreeQuery.AbstractVisitingPrefixTreeQuery(org.locationtech.spatial4j.shape.Shape, String, org.apache.lucene.spatial.prefix.tree.SpatialPrefixTree, int, int). queryBuffer is the (minimum) distance beyond the query shape edge where non-matching documents are looked for so they can be excluded. If -1 is used then the whole world is examined (a good default for correctness).

Method Detail

equals

public boolean equals(Object o)

Overrides:

equals in class AbstractPrefixTreeQuery

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractPrefixTreeQuery

toString

public String toString(String field)

Specified by:

toString in class Query

bufferShape

protected org.locationtech.spatial4j.shape.Shape bufferShape(org.locationtech.spatial4j.shape.Shape shape,
                                                             double distErr)

Returns a new shape that is larger than shape by at distErr.

getDocIdSet

protected DocIdSet getDocIdSet(LeafReaderContext context)
                        throws IOException

Specified by:

getDocIdSet in class AbstractPrefixTreeQuery

Throws:

IOException