Package org.apache.lucene.search
Class ConstantScoreQuery
- java.lang.Object
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- org.apache.lucene.search.Query
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- org.apache.lucene.search.ConstantScoreQuery
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- All Implemented Interfaces:
Cloneable
public class ConstantScoreQuery extends Query
A query that wraps another query or a filter and simply returns a constant score equal to the query boost for every document that matches the filter or query. For queries it therefore simply strips of all scores and returns a constant one.
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected class
ConstantScoreQuery.ConstantScorer
protected class
ConstantScoreQuery.ConstantWeight
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Constructor Summary
Constructors Constructor Description ConstantScoreQuery(Filter filter)
Wraps a Filter as a Query.ConstantScoreQuery(Query query)
Strips off scores from the passed in Query.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Weight
createWeight(IndexSearcher searcher)
Expert: Constructs an appropriate Weight implementation for this query.boolean
equals(Object o)
void
extractTerms(Set<Term> terms)
Expert: adds all terms occurring in this query to the terms set.Filter
getFilter()
Returns the encapsulated filter, returnsnull
if a query is wrapped.Query
getQuery()
Returns the encapsulated query, returnsnull
if a filter is wrapped.int
hashCode()
Query
rewrite(IndexReader reader)
Expert: called to re-write queries into primitive queries.String
toString(String field)
Prints a query to a string, withfield
assumed to be the default field and omitted.
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Constructor Detail
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ConstantScoreQuery
public ConstantScoreQuery(Query query)
Strips off scores from the passed in Query. The hits will get a constant score dependent on the boost factor of this query.
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ConstantScoreQuery
public ConstantScoreQuery(Filter filter)
Wraps a Filter as a Query. The hits will get a constant score dependent on the boost factor of this query. If you simply want to strip off scores from a Query, no longer usenew ConstantScoreQuery(new QueryWrapperFilter(query))
, instead useConstantScoreQuery(Query)
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Method Detail
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getFilter
public Filter getFilter()
Returns the encapsulated filter, returnsnull
if a query is wrapped.
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getQuery
public Query getQuery()
Returns the encapsulated query, returnsnull
if a filter is wrapped.
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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 classQuery
- Throws:
IOException
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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 itsrewritten
form.- Overrides:
extractTerms
in classQuery
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createWeight
public Weight createWeight(IndexSearcher searcher) throws IOException
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 classQuery
- Throws:
IOException
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toString
public String toString(String field)
Description copied from class:Query
Prints a query to a string, withfield
assumed to be the default field and omitted.
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