Package org.apache.lucene.search
Class NormsFieldExistsQuery
- java.lang.Object
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- org.apache.lucene.search.Query
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- org.apache.lucene.search.NormsFieldExistsQuery
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public final class NormsFieldExistsQuery extends Query
AQuery
that matches documents that have a value for a given field as reported by field norms. This will not work for fields that omit norms, e.g.StringField
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Constructor Summary
Constructors Constructor Description NormsFieldExistsQuery(String field)
Create a query that will match that have a value for the givenfield
.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Weight
createWeight(IndexSearcher searcher, boolean needsScores, float boost)
Expert: Constructs an appropriate Weight implementation for this query.boolean
equals(Object other)
Override and implement query instance equivalence properly in a subclass.String
getField()
int
hashCode()
Override and implement query hash code properly in a subclass.String
toString(String field)
Prints a query to a string, withfield
assumed to be the default field and omitted.-
Methods inherited from class org.apache.lucene.search.Query
classHash, rewrite, sameClassAs, toString
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Constructor Detail
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NormsFieldExistsQuery
public NormsFieldExistsQuery(String field)
Create a query that will match that have a value for the givenfield
.
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Method Detail
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getField
public String getField()
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equals
public boolean equals(Object other)
Description copied from class:Query
Override and implement query instance equivalence properly in a subclass. This is required so thatQueryCache
works 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 that other instance. Utility methods are provided for certain repetitive code.- Specified by:
equals
in classQuery
- See Also:
Query.sameClassAs(Object)
,Query.classHash()
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hashCode
public int hashCode()
Description copied from class:Query
Override and implement query hash code properly in a subclass. This is required so thatQueryCache
works properly.- Specified by:
hashCode
in classQuery
- See Also:
Query.equals(Object)
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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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createWeight
public Weight createWeight(IndexSearcher searcher, boolean needsScores, float boost) 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
needsScores
- True if document scores (Scorer.score()
) are needed.boost
- The boost that is propagated by the parent queries.- Throws:
IOException
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