org.apache.lucene.search.spans

Class SpanBoostQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.spans.SpanQuery

org.apache.lucene.search.spans.SpanBoostQuery

public final class SpanBoostQuery
extends SpanQuery

Counterpart of BoostQuery for spans.

Constructor Summary

Constructors

Constructor and Description
SpanBoostQuery(SpanQuery query, float boost) Sole constructor: wrap query in such a way that the produced scores will be boosted by boost.

Method Summary

Modifier and Type	Method and Description
SpanWeight	createWeight(IndexSearcher searcher, boolean needsScores) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object obj)
float	getBoost() Return the applied boost.
String	getField() Returns the name of the field matched by this query.
SpanQuery	getQuery() Return the wrapped SpanQuery.
int	hashCode()
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

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SpanBoostQuery

public SpanBoostQuery(SpanQuery query,
                      float boost)

Sole constructor: wrap query in such a way that the produced scores will be boosted by boost.

Method Detail

getQuery

public SpanQuery getQuery()

Return the wrapped SpanQuery.

getBoost

public float getBoost()

Return the applied boost.

equals

public boolean equals(Object obj)

Overrides:

equals in class Query

hashCode

public int hashCode()

Overrides:

hashCode in class Query

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

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

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

createWeight

public SpanWeight 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.

Specified by:

createWeight in class SpanQuery

needsScores - True if document scores (Scorer.score()) or match frequencies (Scorer.freq()) are needed.

Throws:

IOException