org.apache.lucene.search

Class NormsFieldExistsQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.NormsFieldExistsQuery

public final class NormsFieldExistsQuery
extends Query

A Query 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.

Constructor Summary

Constructors

Constructor and Description
NormsFieldExistsQuery(String field) Create a query that will match that have a value for the given field.

Method Summary

Modifier and Type	Method and 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, with field assumed to be the default field and omitted.

Methods inherited from class org.apache.lucene.search.Query

classHash, rewrite, sameClassAs, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

NormsFieldExistsQuery

public NormsFieldExistsQuery(String field)

Create a query that will match that have a value for the given field.

Method Detail

getField

public String getField()

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 that QueryCache 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 class Query

See Also:

Query.sameClassAs(Object), Query.classHash()

hashCode

public int hashCode()

Description copied from class: Query

Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)

toString

public String toString(String field)

Description copied from class: Query

Prints a query to a string, with field assumed to be the default field and omitted.

Specified by:

toString in class Query

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 class Query

needsScores - True if document scores (Scorer.score()) are needed.

boost - The boost that is propagated by the parent queries.

Throws:

IOException