org.apache.lucene.search
Class ConstantScoreQuery

java.lang.Object
  extended by org.apache.lucene.search.Query
      extended by org.apache.lucene.search.ConstantScoreQuery
All Implemented Interfaces:
Serializable, Cloneable

public class ConstantScoreQuery
extends Query

A query that wraps a filter and simply returns a constant score equal to the query boost for every document in the filter.

See Also:
Serialized Form

Nested Class Summary
protected  class ConstantScoreQuery.ConstantScorer
           
protected  class ConstantScoreQuery.ConstantWeight
           
 
Field Summary
protected  Filter filter
           
 
Constructor Summary
ConstantScoreQuery(Filter filter)
           
 
Method Summary
 Weight createWeight(Searcher searcher)
          Expert: Constructs an appropriate Weight implementation for this query.
 boolean equals(Object o)
          Returns true if o is equal to this.
 void extractTerms(Set<Term> terms)
          Expert: adds all terms occurring in this query to the terms set.
 Filter getFilter()
          Returns the encapsulated filter
 int hashCode()
          Returns a hash code value for this object.
 Query rewrite(IndexReader reader)
          Expert: called to re-write queries into primitive queries.
 String toString(String field)
          Prints a user-readable version of this query.
 
Methods inherited from class org.apache.lucene.search.Query
clone, combine, getBoost, getSimilarity, mergeBooleanQueries, setBoost, toString, weight
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

filter

protected final Filter filter
Constructor Detail

ConstantScoreQuery

public ConstantScoreQuery(Filter filter)
Method Detail

getFilter

public Filter getFilter()
Returns the encapsulated filter


rewrite

public Query rewrite(IndexReader reader)
              throws IOException
Description copied from class: Query
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.

Overrides:
rewrite in class Query
Throws:
IOException

extractTerms

public void extractTerms(Set<Term> terms)
Description copied from class: Query
Expert: adds all terms occurring in this query to the terms set. Only works if this query is in its rewritten form.

Overrides:
extractTerms in class Query

createWeight

public Weight createWeight(Searcher searcher)
Description copied from class: Query
Expert: Constructs an appropriate Weight implementation for this query.

Only implemented by primitive queries, which re-write to themselves.

Overrides:
createWeight in class Query

toString

public String toString(String field)
Prints a user-readable version of this query.

Specified by:
toString in class Query

equals

public boolean equals(Object o)
Returns true if o is equal to this.

Overrides:
equals in class Query

hashCode

public int hashCode()
Returns a hash code value for this object.

Overrides:
hashCode in class Query


Copyright © 2000-2010 Apache Software Foundation. All Rights Reserved.