org.apache.lucene.search
Class MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite

java.lang.Object
  org.apache.lucene.search.MultiTermQuery.RewriteMethod
      org.apache.lucene.search.TopTermsRewrite<BooleanQuery>
          org.apache.lucene.search.MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite

All Implemented Interfaces:

Serializable

Enclosing class:

MultiTermQuery

public static final class MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite
extends TopTermsRewrite<BooleanQuery>

A rewrite method that first translates each term into BooleanClause.Occur.SHOULD clause in a BooleanQuery, but the scores are only computed as the boost.

This rewrite method only uses the top scoring terms so it will not overflow the boolean max clause count.

See Also:

MultiTermQuery.setRewriteMethod(org.apache.lucene.search.MultiTermQuery.RewriteMethod), Serialized Form

Nested Class Summary

protected static interface

TermCollectingRewrite.TermCollector

Constructor Summary

MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite(int size)
Create a TopTermsBoostOnlyBooleanQueryRewrite for at most size terms.

Method Summary

protected void	addClause(BooleanQuery topLevel, Term term, float boost) Add a MultiTermQuery term to the top-level query
protected void	collectTerms(IndexReader reader, MultiTermQuery query, TermCollectingRewrite.TermCollector collector)
protected int	getMaxSize() return the maximum size of the priority queue (for boolean rewrites this is BooleanQuery#getMaxClauseCount).
protected BooleanQuery	getTopLevelQuery() Return a suitable top-level Query for holding all expanded terms.

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

equals, getSize, hashCode, rewrite

Methods inherited from class org.apache.lucene.search.MultiTermQuery.RewriteMethod

getTermsEnum

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite

public MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite(int size)

Create a TopTermsBoostOnlyBooleanQueryRewrite for at most size terms.

NOTE: if BooleanQuery.getMaxClauseCount() is smaller than size, then it will be used instead.

Method Detail

getMaxSize

protected int getMaxSize()

Description copied from class: TopTermsRewrite

return the maximum size of the priority queue (for boolean rewrites this is BooleanQuery#getMaxClauseCount).

Specified by:

getMaxSize in class TopTermsRewrite<BooleanQuery>

getTopLevelQuery

protected BooleanQuery getTopLevelQuery()

Return a suitable top-level Query for holding all expanded terms.

addClause

protected void addClause(BooleanQuery topLevel,
                         Term term,
                         float boost)

Add a MultiTermQuery term to the top-level query

collectTerms

protected final void collectTerms(IndexReader reader,
                                  MultiTermQuery query,
                                  TermCollectingRewrite.TermCollector collector)
                           throws IOException

Throws:

IOException