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java.lang.Object org.apache.lucene.search.Weight org.apache.lucene.search.DisjunctionMaxQuery.DisjunctionMaxWeight
protected class DisjunctionMaxQuery.DisjunctionMaxWeight
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.
Field Summary | |
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protected Similarity |
similarity
The Similarity implementation. |
protected ArrayList |
weights
The Weights for our subqueries, in 1-1 correspondence with disjuncts |
Constructor Summary | |
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DisjunctionMaxQuery.DisjunctionMaxWeight(Searcher searcher)
|
Method Summary | |
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Explanation |
explain(IndexReader reader,
int doc)
An explanation of the score computation for the named document. |
Query |
getQuery()
The query that this concerns. |
float |
getValue()
The weight for this query. |
void |
normalize(float norm)
Assigns the query normalization factor to this. |
Scorer |
scorer(IndexReader reader,
boolean scoreDocsInOrder,
boolean topScorer)
Returns a Scorer which scores documents in/out-of order according
to scoreDocsInOrder . |
float |
sumOfSquaredWeights()
The sum of squared weights of contained query clauses. |
Methods inherited from class org.apache.lucene.search.Weight |
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scoresDocsOutOfOrder |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected Similarity similarity
protected ArrayList weights
Constructor Detail |
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public DisjunctionMaxQuery.DisjunctionMaxWeight(Searcher searcher) throws IOException
IOException
Method Detail |
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public Query getQuery()
Weight
getQuery
in class Weight
public float getValue()
Weight
getValue
in class Weight
public float sumOfSquaredWeights() throws IOException
Weight
sumOfSquaredWeights
in class Weight
IOException
public void normalize(float norm)
Weight
normalize
in class Weight
public Scorer scorer(IndexReader reader, boolean scoreDocsInOrder, boolean topScorer) throws IOException
Weight
Scorer
which scores documents in/out-of order according
to scoreDocsInOrder
.
NOTE: even if scoreDocsInOrder
is false, it is
recommended to check whether the returned Scorer
indeed scores
documents out of order (i.e., call Weight.scoresDocsOutOfOrder()
), as
some Scorer
implementations will always return documents
in-order.
NOTE: null can be returned if no documents will be scored by this
query.
scorer
in class Weight
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.
Scorer
which scores documents in/out-of order.
IOException
public Explanation explain(IndexReader reader, int doc) throws IOException
Weight
explain
in class Weight
reader
- sub-reader containing the give doc
IOException
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