Package org.apache.lucene.queries.function

Class FunctionQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.queries.function.FunctionQuery

public class FunctionQuery
extends Query

Returns a score for each document based on a ValueSource, often some function of the value of a field.

See Also:

• ValueSourceScorer

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	FunctionQuery.AllScorer	Scores all documents, applying the function to each document
protected class	FunctionQuery.FunctionWeight	Creates FunctionQuery scorer instances

Constructor Summary

Constructors

Constructor	Description
FunctionQuery(ValueSource func)

Method Summary

Modifier and Type	Method	Description
Weight	createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)
boolean	equals(Object other)	Returns true if o is equal to this.
ValueSource	getValueSource()
int	hashCode()
String	toString(String field)	Prints a user-readable version of this query.
void	visit(QueryVisitor visitor)

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

classHash, rewrite, rewrite, sameClassAs, toString

Methods inherited from class java.lang.Object

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

Constructor Details

FunctionQuery

public FunctionQuery(ValueSource func)

Parameters:

func - defines the function to be used for scoring

Method Details

getValueSource

public ValueSource getValueSource()

Returns:

The associated ValueSource

visit

public void visit(QueryVisitor visitor)

Specified by:

visit in class Query

createWeight

public Weight createWeight(IndexSearcher searcher,
 ScoreMode scoreMode,
 float boost)
                    throws IOException

Overrides:

createWeight in class Query

Throws:

IOException

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 other)

Returns true if o is equal to this.

Specified by:

equals in class Query

hashCode

public int hashCode()

Specified by:

hashCode in class Query