Package org.apache.lucene.search

Class MultiTermQueryConstantScoreWrapper<Q extends MultiTermQuery>

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.MultiTermQueryConstantScoreWrapper<Q>

final class MultiTermQueryConstantScoreWrapper<Q extends MultiTermQuery>
extends Query

This class also provides the functionality behind MultiTermQuery.CONSTANT_SCORE_REWRITE. It tries to rewrite per-segment as a boolean query that returns a constant score and otherwise fills a bit set with matches and builds a Scorer on top of this bit set.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	MultiTermQueryConstantScoreWrapper.TermAndState
private static class	MultiTermQueryConstantScoreWrapper.WeightOrDocIdSet

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	BOOLEAN_REWRITE_TERM_COUNT_THRESHOLD
protected final Q	query

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	MultiTermQueryConstantScoreWrapper(Q query)	Wrap a MultiTermQuery as a Filter.

Method Summary

Modifier and Type	Method	Description
Weight	createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)	Expert: Constructs an appropriate Weight implementation for this query.
final boolean	equals(Object other)	Override and implement query instance equivalence properly in a subclass.
final String	getField()	Returns the field name for this query
Q	getQuery()	Returns the encapsulated query
final int	hashCode()	Override and implement query hash code properly in a subclass.
String	toString(String field)	Prints a query to a string, with field assumed to be the default field and omitted.
void	visit(QueryVisitor visitor)	Recurse through the query tree, visiting any child queries

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

Field Details

BOOLEAN_REWRITE_TERM_COUNT_THRESHOLD

private static final int BOOLEAN_REWRITE_TERM_COUNT_THRESHOLD

See Also:

• Constant Field Values

query

protected final Q extends MultiTermQuery query

Constructor Details

MultiTermQueryConstantScoreWrapper

protected MultiTermQueryConstantScoreWrapper(Q query)

Wrap a MultiTermQuery as a Filter.

Method Details

toString

public String toString(String field)

Description copied from class: Query

Prints a query to a string, with field assumed to be the default field and omitted.

Specified by:

toString in class Query

equals

public final boolean equals(Object other)

Description copied from class: Query

Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.

Specified by:

equals in class Query

See Also:

• Query.sameClassAs(Object)
• Query.classHash()

hashCode

public final 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)

getQuery

public Q getQuery()

Returns the encapsulated query

getField

public final String getField()

Returns the field name for this query

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

Parameters:

scoreMode - How the produced scorers will be consumed.

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

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