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

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(Object other) Returns true if o is equal to this.
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.
String	toString(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

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 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:

IOException

createWeight

public Weight createWeight(IndexSearcher searcher,
                           boolean needsScores)
                    throws 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:

IOException

toString

public final String toString(String f)

Prints a user-readable version of this query.

Specified by:

toString in class Query

equals

public boolean equals(Object other)

Returns true if o is equal to this.

Specified by:

equals in class Query

See Also:

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

hashCode

public int hashCode()

Returns a hash code value for this object.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)