org.apache.lucene.search.spans

Class SpanPositionCheckQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.spans.SpanQuery

org.apache.lucene.search.spans.SpanPositionCheckQuery

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

SpanNearPayloadCheckQuery, SpanPayloadCheckQuery, SpanPositionRangeQuery

public abstract class SpanPositionCheckQuery
extends SpanQuery
implements Cloneable

Base class for filtering a SpanQuery based on the position of a match.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	SpanPositionCheckQuery.AcceptStatus Return value for acceptPosition(Spans).
protected class	SpanPositionCheckQuery.PositionCheckSpan

Field Summary

Fields

Modifier and Type	Field and Description
protected SpanQuery	match

Constructor Summary

Constructors

Constructor and Description
SpanPositionCheckQuery(SpanQuery match)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract SpanPositionCheckQuery.AcceptStatus	acceptPosition(Spans spans) Implementing classes are required to return whether the current position is a match for the passed in "match" SpanQuery.
void	extractTerms(Set<Term> terms) Expert: adds all terms occurring in this query to the terms set.
String	getField() Returns the name of the field matched by this query.
SpanQuery	getMatch()
Spans	getSpans(AtomicReaderContext context, Bits acceptDocs, Map<Term,TermContext> termContexts) Expert: Returns the matches for this query in an index.
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.

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

createWeight

Methods inherited from class org.apache.lucene.search.Query

clone, equals, getBoost, hashCode, setBoost, toString, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

match

protected SpanQuery match

Constructor Detail

SpanPositionCheckQuery

public SpanPositionCheckQuery(SpanQuery match)

Method Detail

getMatch

public SpanQuery getMatch()

Returns:

the SpanQuery whose matches are filtered.

getField

public String getField()

Description copied from class: SpanQuery

Returns the name of the field matched by this query.

Note that this may return null if the query matches no terms.

Specified by:

getField in class SpanQuery

extractTerms

public void extractTerms(Set<Term> terms)

Description copied from class: Query

Expert: adds all terms occurring in this query to the terms set. Only works if this query is in its rewritten form.

Overrides:

extractTerms in class Query

acceptPosition

protected abstract SpanPositionCheckQuery.AcceptStatus acceptPosition(Spans spans)
                                                               throws IOException

Implementing classes are required to return whether the current position is a match for the passed in "match" SpanQuery. This is only called if the underlying Spans.next() for the match is successful

Parameters:

spans - The Spans instance, positioned at the spot to check

Returns:

whether the match is accepted, rejected, or rejected and should move to the next doc.

Throws:

IOException

See Also:

Spans.next()

getSpans

public Spans getSpans(AtomicReaderContext context,
             Bits acceptDocs,
             Map<Term,TermContext> termContexts)
               throws IOException

Description copied from class: SpanQuery

Expert: Returns the matches for this query in an index. Used internally to search for spans.

Specified by:

getSpans in class SpanQuery

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