org.apache.lucene.search
Class MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite

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


Copyright © 2000-2013 Apache Software Foundation. All Rights Reserved.