Package org.apache.lucene.search

Class TopTermsRewrite<Q extends Query>

java.lang.Object

org.apache.lucene.search.MultiTermQuery.RewriteMethod

org.apache.lucene.search.TopTermsRewrite<Q>

Direct Known Subclasses:

MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite, MultiTermQuery.TopTermsScoringBooleanQueryRewrite

public abstract class TopTermsRewrite<Q extends Query>
extends MultiTermQuery.RewriteMethod

Base rewrite method for collecting only the top terms via a priority queue.

Constructor Summary

Constructors

Constructor	Description
TopTermsRewrite(int size)	Create a TopTermsBooleanQueryRewrite for at most size terms.

Method Summary

Modifier and Type	Method	Description
protected void	addClause(Q topLevel, Term term, int docCount, float boost)	Add a MultiTermQuery term to the top-level query
protected abstract void	addClause(Q topLevel, Term term, int docCount, float boost, TermContext states)
boolean	equals(Object obj)
protected abstract int	getMaxSize()	return the maximum size of the priority queue (for boolean rewrites this is BooleanQuery#getMaxClauseCount).
int	getSize()	return the maximum priority queue size
protected abstract Q	getTopLevelQuery()	Return a suitable top-level Query for holding all expanded terms.
int	hashCode()
Q	rewrite(IndexReader reader, MultiTermQuery query)

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

TopTermsRewrite

public TopTermsRewrite(int size)

Create a TopTermsBooleanQueryRewrite for at most size terms.

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

Method Detail

getSize

public int getSize()

return the maximum priority queue size

getMaxSize

protected abstract int getMaxSize()

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

rewrite

public final Q rewrite(IndexReader reader,
                       MultiTermQuery query)
                throws IOException

Specified by:

rewrite in class MultiTermQuery.RewriteMethod

Throws:

IOException

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

getTopLevelQuery

protected abstract Q getTopLevelQuery()
                               throws IOException

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

Throws:

IOException

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

addClause

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

Throws:

IOException