org.apache.lucene.search

Class DisjunctionMaxQuery.DisjunctionMaxWeight

java.lang.Object

org.apache.lucene.search.Weight

org.apache.lucene.search.DisjunctionMaxQuery.DisjunctionMaxWeight

All Implemented Interfaces:

Serializable

Enclosing class:

DisjunctionMaxQuery

protected class DisjunctionMaxQuery.DisjunctionMaxWeight
extends Weight

Expert: the Weight for DisjunctionMaxQuery, used to normalize, score and explain these queries.

NOTE: this API and implementation is subject to change suddenly in the next release.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Similarity	similarity The Similarity implementation.
protected ArrayList<Weight>	weights The Weights for our subqueries, in 1-1 correspondence with disjuncts

Constructor Summary

Constructors

Constructor and Description
DisjunctionMaxQuery.DisjunctionMaxWeight(Searcher searcher) Construct the Weight for this Query searched by searcher.

Method Summary

Methods

Modifier and Type	Method and Description
Explanation	explain(IndexReader reader, int doc) Explain the score we computed for doc
Query	getQuery() Return our associated DisjunctionMaxQuery
float	getValue() Return our boost
void	normalize(float norm) Apply the computed normalization factor to our subqueries
Scorer	scorer(IndexReader reader, boolean scoreDocsInOrder, boolean topScorer) Create the scorer used to score our associated DisjunctionMaxQuery
float	sumOfSquaredWeights() Compute the sub of squared weights of us applied to our subqueries.

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

scoresDocsOutOfOrder

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

similarity

protected Similarity similarity

The Similarity implementation.

weights

protected ArrayList<Weight> weights

The Weights for our subqueries, in 1-1 correspondence with disjuncts

Constructor Detail

DisjunctionMaxQuery.DisjunctionMaxWeight

public DisjunctionMaxQuery.DisjunctionMaxWeight(Searcher searcher)
                                         throws IOException

Construct the Weight for this Query searched by searcher. Recursively construct subquery weights.

Throws:

IOException

Method Detail

getQuery

public Query getQuery()

Return our associated DisjunctionMaxQuery

Specified by:

getQuery in class Weight

getValue

public float getValue()

Return our boost

Specified by:

getValue in class Weight

sumOfSquaredWeights

public float sumOfSquaredWeights()
                          throws IOException

Compute the sub of squared weights of us applied to our subqueries. Used for normalization.

Specified by:

sumOfSquaredWeights in class Weight

Throws:

IOException

normalize

public void normalize(float norm)

Apply the computed normalization factor to our subqueries

Specified by:

normalize in class Weight

scorer

public Scorer scorer(IndexReader reader,
            boolean scoreDocsInOrder,
            boolean topScorer)
              throws IOException

Create the scorer used to score our associated DisjunctionMaxQuery

Specified by:

scorer in class Weight

Parameters:

reader - the IndexReader for which to return the Scorer.

scoreDocsInOrder - specifies whether in-order scoring of documents is required. Note that if set to false (i.e., out-of-order scoring is required), this method can return whatever scoring mode it supports, as every in-order scorer is also an out-of-order one. However, an out-of-order scorer may not support DocIdSetIterator.nextDoc() and/or DocIdSetIterator.advance(int), therefore it is recommended to request an in-order scorer if use of these methods is required.

topScorer - if true, Scorer.score(Collector) will be called; if false, DocIdSetIterator.nextDoc() and/or DocIdSetIterator.advance(int) will be called.

Returns:

a Scorer which scores documents in/out-of order.

Throws:

IOException

explain

public Explanation explain(IndexReader reader,
                  int doc)
                    throws IOException

Explain the score we computed for doc

Specified by:

explain in class Weight

Parameters:

reader - sub-reader containing the give doc

Returns:

an Explanation for the score

Throws:

IOException