Package org.apache.lucene.search.spans

Class SpanNotQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.spans.SpanQuery

org.apache.lucene.search.spans.SpanNotQuery

public final class SpanNotQuery
extends SpanQuery

Removes matches which overlap with another SpanQuery or which are within x tokens before or y tokens after another SpanQuery.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	SpanNotQuery.SpanNotWeight

Constructor Summary

Constructors

Constructor	Description
SpanNotQuery(SpanQuery include, SpanQuery exclude)	Construct a SpanNotQuery matching spans from include which have no overlap with spans from exclude.
SpanNotQuery(SpanQuery include, SpanQuery exclude, int dist)	Construct a SpanNotQuery matching spans from include which have no overlap with spans from exclude within dist tokens of include.
SpanNotQuery(SpanQuery include, SpanQuery exclude, int pre, int post)	Construct a SpanNotQuery matching spans from include which have no overlap with spans from exclude within pre tokens before or post tokens of include.

Method Summary

Modifier and Type	Method	Description
SpanWeight	createWeight(IndexSearcher searcher, boolean needsScores, float boost)	Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object other)	Returns true iff o is equal to this.
SpanQuery	getExclude()	Return the SpanQuery whose matches must not overlap those returned.
String	getField()	Returns the name of the field matched by this query.
SpanQuery	getInclude()	Return the SpanQuery whose matches are filtered.
int	hashCode()	Override and implement query hash code properly in a subclass.
Query	rewrite(IndexReader reader)	Expert: called to re-write queries into primitive queries.
String	toString(String field)	Prints a query to a string, with field assumed to be the default field and omitted.

Methods inherited from class org.apache.lucene.search.spans.SpanQuery

getTermContexts, getTermContexts

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

SpanNotQuery

public SpanNotQuery(SpanQuery include,
                    SpanQuery exclude)

Construct a SpanNotQuery matching spans from include which have no overlap with spans from exclude.

SpanNotQuery

public SpanNotQuery(SpanQuery include,
                    SpanQuery exclude,
                    int dist)

Construct a SpanNotQuery matching spans from include which have no overlap with spans from exclude within dist tokens of include. Inversely, a negative dist value may be used to specify a certain amount of allowable overlap.

SpanNotQuery

public SpanNotQuery(SpanQuery include,
                    SpanQuery exclude,
                    int pre,
                    int post)

Construct a SpanNotQuery matching spans from include which have no overlap with spans from exclude within pre tokens before or post tokens of include. Inversely, negative values for pre and/or post allow a certain amount of overlap to occur.

Method Detail

getInclude

public SpanQuery getInclude()

Return the SpanQuery whose matches are filtered.

getExclude

public SpanQuery getExclude()

Return the SpanQuery whose matches must not overlap those returned.

getField

public String getField()

Description copied from class: SpanQuery

Returns the name of the field matched by this query.

Specified by:

getField in class SpanQuery

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

createWeight

public SpanWeight createWeight(IndexSearcher searcher,
                               boolean needsScores,
                               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.

Specified by:

createWeight in class SpanQuery

needsScores - True if document scores (Scorer.score()) are needed.

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

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()

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)