org.apache.lucene.queries.payloads

Class PayloadScoreQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.spans.SpanQuery

org.apache.lucene.queries.payloads.PayloadScoreQuery

public class PayloadScoreQuery
extends SpanQuery

A Query class that uses a PayloadFunction to modify the score of a wrapped SpanQuery NOTE: In order to take advantage of this with the default scoring implementation (ClassicSimilarity), you must override ClassicSimilarity.scorePayload(int, int, int, BytesRef), which returns 1 by default.

See Also:

Similarity.SimScorer.computePayloadFactor(int, int, int, BytesRef)

Constructor Summary

Constructors

Constructor and Description
PayloadScoreQuery(SpanQuery wrappedQuery, PayloadFunction function) Creates a new PayloadScoreQuery that includes the underlying span scores
PayloadScoreQuery(SpanQuery wrappedQuery, PayloadFunction function, boolean includeSpanScore) Creates a new PayloadScoreQuery

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 other) Override and implement query instance equivalence properly in a subclass.
String	getField() Returns the name of the field matched by this query.
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.

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

getTermContexts, getTermContexts

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

Constructor Detail

PayloadScoreQuery

public PayloadScoreQuery(SpanQuery wrappedQuery,
                         PayloadFunction function,
                         boolean includeSpanScore)

Creates a new PayloadScoreQuery

Parameters:

wrappedQuery - the query to wrap

function - a PayloadFunction to use to modify the scores

includeSpanScore - include both span score and payload score in the scoring algorithm

PayloadScoreQuery

public PayloadScoreQuery(SpanQuery wrappedQuery,
                         PayloadFunction function)

Creates a new PayloadScoreQuery that includes the underlying span scores

Parameters:

wrappedQuery - the query to wrap

function - a PayloadFunction to use to modify the scores

Method Detail

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)
                        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

equals

public 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 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)