org.apache.lucene.search

Class PhraseQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.PhraseQuery

public class PhraseQuery
extends Query

A Query that matches documents containing a particular sequence of terms. A PhraseQuery is built by QueryParser for input like "new york".

This query may be combined with other terms or queries with a BooleanQuery.

NOTE: All terms in the phrase must match, even those at the same position. If you have terms at the same position, perhaps synonyms, you probably want MultiPhraseQuery instead which only requires one term at a position to match.
Also, Leading holes don't have any particular meaning for this query and will be ignored. For instance this query:

 PhraseQuery.Builder builder = new PhraseQuery.Builder();
 builder.add(new Term("body", "one"), 4);
 builder.add(new Term("body", "two"), 5);
 PhraseQuery pq = builder.build();
 

is equivalent to the below query:

 PhraseQuery.Builder builder = new PhraseQuery.Builder();
 builder.add(new Term("body", "one"), 0);
 builder.add(new Term("body", "two"), 1);
 PhraseQuery pq = builder.build();
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PhraseQuery.Builder A builder for phrase queries.

Constructor Summary

Constructors

Constructor and Description
PhraseQuery(int slop, String field, BytesRef... terms) Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field, and at a maximum edit distance of slop.
PhraseQuery(int slop, String field, String... terms) Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field, and at a maximum edit distance of slop.
PhraseQuery(String field, BytesRef... terms) Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field.
PhraseQuery(String field, String... terms) Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field.

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 iff o is equal to this.
int[]	getPositions() Returns the relative positions of terms in this phrase.
int	getSlop() Return the slop for this PhraseQuery.
Term[]	getTerms() Returns the list of terms in this 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

Constructor Detail

PhraseQuery

public PhraseQuery(int slop,
                   String field,
                   String... terms)

Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field, and at a maximum edit distance of slop. For more complicated use-cases, use PhraseQuery.Builder.

See Also:

getSlop()

PhraseQuery

public PhraseQuery(String field,
                   String... terms)

Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field.

PhraseQuery

public PhraseQuery(int slop,
                   String field,
                   BytesRef... terms)

Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field, and at a maximum edit distance of slop. For more complicated use-cases, use PhraseQuery.Builder.

See Also:

getSlop()

PhraseQuery

public PhraseQuery(String field,
                   BytesRef... terms)

Create a phrase query which will match documents that contain the given list of terms at consecutive positions in field.

Method Detail

getSlop

public int getSlop()

Return the slop for this PhraseQuery.

The slop is an edit distance between respective positions of terms as defined in this PhraseQuery and the positions of terms in a document.

For instance, when searching for "quick fox", it is expected that the difference between the positions of fox and quick is 1. So "a quick brown fox" would be at an edit distance of 1 since the difference of the positions of fox and quick is 2. Similarly, "the fox is quick" would be at an edit distance of 3 since the difference of the positions of fox and quick is -2. The slop defines the maximum edit distance for a document to match.

More exact matches are scored higher than sloppier matches, thus search results are sorted by exactness.

getTerms

public Term[] getTerms()

Returns the list of terms in this phrase.

getPositions

public int[] getPositions()

Returns the relative positions of terms in this phrase.

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 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 iff 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)