org.apache.lucene.search

Class BooleanQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.BooleanQuery

All Implemented Interfaces:

Iterable<BooleanClause>

public class BooleanQuery
extends Query
implements Iterable<BooleanClause>

A Query that matches documents matching boolean combinations of other queries, e.g. TermQuerys, PhraseQuerys or other BooleanQuerys.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BooleanQuery.Builder A builder for boolean queries.
static class	BooleanQuery.TooManyClauses Thrown when an attempt is made to add more than getMaxClauseCount() clauses.

Method Summary

Modifier and Type	Method and Description
List<BooleanClause>	clauses() Return a list of the clauses of this BooleanQuery.
Weight	createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object o) Compares the specified object with this boolean query for equality.
static int	getMaxClauseCount() Return the maximum number of clauses permitted, 1024 by default.
int	getMinimumNumberShouldMatch() Gets the minimum number of the optional BooleanClauses which must be satisfied.
int	hashCode() Override and implement query hash code properly in a subclass.
Iterator<BooleanClause>	iterator() Returns an iterator on the clauses in this query.
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.
static void	setMaxClauseCount(int maxClauseCount) Set the maximum number of clauses permitted per BooleanQuery.
String	toString(String field) Prints a user-readable version of this query.
void	visit(QueryVisitor visitor) Recurse through the query tree, visiting any child queries

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Detail

getMaxClauseCount

public static int getMaxClauseCount()

Return the maximum number of clauses permitted, 1024 by default. Attempts to add more than the permitted number of clauses cause BooleanQuery.TooManyClauses to be thrown.

See Also:

setMaxClauseCount(int)

setMaxClauseCount

public static void setMaxClauseCount(int maxClauseCount)

Set the maximum number of clauses permitted per BooleanQuery. Default value is 1024.

getMinimumNumberShouldMatch

public int getMinimumNumberShouldMatch()

Gets the minimum number of the optional BooleanClauses which must be satisfied.

clauses

public List<BooleanClause> clauses()

Return a list of the clauses of this BooleanQuery.

iterator

public final Iterator<BooleanClause> iterator()

Returns an iterator on the clauses in this query. It implements the Iterable interface to make it possible to do:

for (BooleanClause clause : booleanQuery) {}

Specified by:

iterator in interface Iterable<BooleanClause>

createWeight

public Weight createWeight(IndexSearcher searcher,
                           ScoreMode scoreMode,
                           float boost)
                    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

scoreMode - How the produced scorers will be consumed.

boost - The boost that is propagated by the parent queries.

Throws:

IOException

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

visit

public void visit(QueryVisitor visitor)

Description copied from class: Query

Recurse through the query tree, visiting any child queries

Overrides:

visit in class Query

Parameters:

visitor - a QueryVisitor to be called by each query in the tree

toString

public String toString(String field)

Prints a user-readable version of this query.

Specified by:

toString in class Query

equals

public boolean equals(Object o)

Compares the specified object with this boolean query for equality. Returns true if and only if the provided object

• is also a BooleanQuery,
• has the same value of getMinimumNumberShouldMatch()
• has the same BooleanClause.Occur.SHOULD clauses, regardless of the order
• has the same BooleanClause.Occur.MUST clauses, regardless of the order
• has the same set of BooleanClause.Occur.FILTER clauses, regardless of the order and regardless of duplicates
• has the same set of BooleanClause.Occur.MUST_NOT clauses, regardless of the order and regardless of duplicates

Specified by:

equals in class Query

See Also:

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

hashCode

public int hashCode()

Description copied from class: Query

Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)