Package org.apache.lucene.search
Class ConstantScoreQuery
java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.ConstantScoreQuery
A query that wraps another query and simply returns a constant score equal to 1 for every
document that matches the query. It therefore simply strips of all scores and always returns 1.
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected static classWe return this as ourBulkScorerso that if the CSQ wraps a query with its own optimized top-level scorer (e.g. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncreateWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) Expert: Constructs an appropriate Weight implementation for this query.booleanOverride and implement query instance equivalence properly in a subclass.getQuery()Returns the encapsulated query.inthashCode()Override and implement query hash code properly in a subclass.rewrite(IndexSearcher indexSearcher) Expert: called to re-write queries into primitive queries.Prints a query to a string, withfieldassumed to be the default field and omitted.voidvisit(QueryVisitor visitor) Recurse through the query tree, visiting any child queries.Methods inherited from class org.apache.lucene.search.Query
classHash, sameClassAs, toString
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Constructor Details
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ConstantScoreQuery
Strips off scores from the passed in Query. The hits will get a constant score of 1.
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Method Details
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getQuery
Returns the encapsulated query. -
rewrite
Description copied from class:QueryExpert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.Callers are expected to call
rewritemultiple times if necessary, until the rewritten query is the same as the original query.The rewrite process may be able to make use of IndexSearcher's executor and be executed in parallel if the executor is provided.
- Overrides:
rewritein classQuery- Throws:
IOException- See Also:
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visit
Description copied from class:QueryRecurse through the query tree, visiting any child queries. -
createWeight
public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException Description copied from class:QueryExpert: Constructs an appropriate Weight implementation for this query.Only implemented by primitive queries, which re-write to themselves.
- Overrides:
createWeightin classQuery- Parameters:
scoreMode- How the produced scorers will be consumed.boost- The boost that is propagated by the parent queries.- Throws:
IOException
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toString
Description copied from class:QueryPrints a query to a string, withfieldassumed to be the default field and omitted. -
equals
Description copied from class:QueryOverride and implement query instance equivalence properly in a subclass. This is required so thatQueryCacheworks properly.Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical to those of the other instance. Utility methods are provided for certain repetitive code.
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hashCode
public int hashCode()Description copied from class:QueryOverride and implement query hash code properly in a subclass. This is required so thatQueryCacheworks properly.
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