org.apache.lucene.search.payloads
Class PayloadNearQuery

java.lang.Object
  org.apache.lucene.search.Query
      org.apache.lucene.search.spans.SpanQuery
          org.apache.lucene.search.spans.SpanNearQuery
              org.apache.lucene.search.payloads.PayloadNearQuery

All Implemented Interfaces:

Serializable, Cloneable

public class PayloadNearQuery
extends SpanNearQuery

This class is very similar to SpanNearQuery except that it factors in the value of the payloads located at each of the positions where the TermSpans occurs.

In order to take advantage of this, you must override Similarity.scorePayload(int, java.lang.String, int, int, byte[], int, int) which returns 1 by default.

Payload scores are aggregated using a pluggable PayloadFunction.

See Also:

Similarity.scorePayload(int, java.lang.String, int, int, byte[], int, int), Serialized Form

Nested Class Summary

class	PayloadNearQuery.PayloadNearSpanScorer
class	PayloadNearQuery.PayloadNearSpanWeight

Field Summary

protected String	fieldName
protected PayloadFunction	function

Fields inherited from class org.apache.lucene.search.spans.SpanNearQuery

clauses, field, inOrder, slop

Constructor Summary

PayloadNearQuery(SpanQuery[] clauses, int slop, boolean inOrder)

PayloadNearQuery(SpanQuery[] clauses, int slop, boolean inOrder, PayloadFunction function)

Method Summary

Object	clone() Returns a clone of this query.
Weight	createWeight(Searcher searcher) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object obj) Returns true iff o is equal to this.
int	hashCode()
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.SpanNearQuery

extractTerms, getClauses, getField, getSlop, getSpans, isInOrder, rewrite

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

combine, getBoost, getSimilarity, mergeBooleanQueries, setBoost, toString, weight

Methods inherited from class java.lang.Object

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

Field Detail

fieldName

protected String fieldName

function

protected PayloadFunction function

Constructor Detail

PayloadNearQuery

public PayloadNearQuery(SpanQuery[] clauses,
                        int slop,
                        boolean inOrder)

PayloadNearQuery

public PayloadNearQuery(SpanQuery[] clauses,
                        int slop,
                        boolean inOrder,
                        PayloadFunction function)

Method Detail

createWeight

public Weight createWeight(Searcher searcher)
                    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 SpanQuery

Throws:

IOException

clone

public Object clone()

Description copied from class: Query

Returns a clone of this query.

Overrides:

clone in class SpanNearQuery

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.

The representation used is one that is supposed to be readable by QueryParser. However, there are the following limitations:

• If the query was created by the parser, the printed representation may not be exactly what was parsed. For example, characters that need to be escaped will be represented without the required backslash.
• Some of the more complicated queries (e.g. span queries) don't have a representation that can be parsed by QueryParser.

Overrides:

toString in class SpanNearQuery

hashCode

public int hashCode()

Overrides:

hashCode in class SpanNearQuery

equals

public boolean equals(Object obj)

Description copied from class: SpanNearQuery

Returns true iff o is equal to this.

Overrides:

equals in class SpanNearQuery