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

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)

Constructor Summary

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

Method Summary

protected void	addClause(BooleanQuery topLevel, Term term, int docFreq, float boost, TermContext states)
protected void	addClause(Q topLevel, Term term, int docCount, float boost) Add a MultiTermQuery term to the top-level query
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,
                         int docFreq,
                         float boost,
                         TermContext states)

addClause

protected final void addClause(Q topLevel,
                               Term term,
                               int docCount,
                               float boost)
                        throws IOException

Add a MultiTermQuery term to the top-level query

Throws:

IOException