org.apache.lucene.search

Class MultiPhraseQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.MultiPhraseQuery

public class MultiPhraseQuery
extends Query

A generalized version of PhraseQuery, with the possibility of adding more than one term at the same position that are treated as a disjunction (OR). To use this class to search for the phrase "Microsoft app*" first create a Builder and use MultiPhraseQuery.Builder.add(Term) on the term "microsoft" (assuming lowercase analysis), then find all terms that have "app" as prefix using LeafReader.terms(String), seeking to "app" then iterating and collecting terms until there is no longer that prefix, and finally use MultiPhraseQuery.Builder.add(Term[]) to add them. MultiPhraseQuery.Builder.build() returns the fully constructed (and immutable) MultiPhraseQuery.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MultiPhraseQuery.Builder A builder for multi-phrase queries
private class	MultiPhraseQuery.MultiPhraseWeight
(package private) static class	MultiPhraseQuery.UnionPostingsEnum Takes the logical union of multiple PostingsEnum iterators.

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.String	field
private int[]	positions
private int	slop
private Term[][]	termArrays

Constructor Summary

Constructors

Modifier	Constructor and Description
private	MultiPhraseQuery(java.lang.String field, Term[][] termArrays, int[] positions, int slop)

Method Summary

Modifier and Type	Method and Description
Weight	createWeight(IndexSearcher searcher, boolean needsScores) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(java.lang.Object other) Returns true if o is equal to this.
private boolean	equalsTo(MultiPhraseQuery other)
int[]	getPositions() Returns the relative positions of terms in this phrase.
int	getSlop() Sets the phrase slop for this query.
Term[][]	getTermArrays() Returns the arrays of arrays of terms in the multi-phrase.
int	hashCode() Returns a hash code value for this object.
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.
private boolean	termArraysEquals(Term[][] termArrays1, Term[][] termArrays2)
private int	termArraysHashCode()
java.lang.String	toString(java.lang.String f) Prints a user-readable version of this query.

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

classHash, sameClassAs, toString

Methods inherited from class java.lang.Object

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

Field Detail

field

private final java.lang.String field

termArrays

private final Term[][] termArrays

positions

private final int[] positions

slop

private final int slop

Constructor Detail

MultiPhraseQuery

private MultiPhraseQuery(java.lang.String field,
                         Term[][] termArrays,
                         int[] positions,
                         int slop)

Method Detail

getSlop

public int getSlop()

Sets the phrase slop for this query.

See Also:

PhraseQuery.getSlop()

getTermArrays

public Term[][] getTermArrays()

Returns the arrays of arrays of terms in the multi-phrase. Do not modify!

getPositions

public int[] getPositions()

Returns the relative positions of terms in this phrase. Do not modify!

rewrite

public Query rewrite(IndexReader reader)
              throws java.io.IOException

Description copied from class: Query

Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.

Overrides:

rewrite in class Query

Throws:

java.io.IOException

createWeight

public Weight createWeight(IndexSearcher searcher,
                           boolean needsScores)
                    throws java.io.IOException

Description copied from class: Query

Expert: Constructs an appropriate Weight implementation for this query.

Only implemented by primitive queries, which re-write to themselves.

Overrides:

createWeight in class Query

needsScores - True if document scores (Scorer.score()) or match frequencies (Scorer.freq()) are needed.

Throws:

java.io.IOException

toString

public final java.lang.String toString(java.lang.String f)

Prints a user-readable version of this query.

Specified by:

toString in class Query

equals

public boolean equals(java.lang.Object other)

Returns true if o is equal to this.

Specified by:

equals in class Query

See Also:

Query.sameClassAs(Object), Query.classHash()

equalsTo

private boolean equalsTo(MultiPhraseQuery other)

hashCode

public int hashCode()

Returns a hash code value for this object.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)

termArraysHashCode

private int termArraysHashCode()

termArraysEquals

private boolean termArraysEquals(Term[][] termArrays1,
                                 Term[][] termArrays2)