Package org.apache.lucene.queries.function.valuesource

Class DoubleFieldSource

java.lang.Object

org.apache.lucene.queries.function.ValueSource

org.apache.lucene.queries.function.valuesource.FieldCacheSource

org.apache.lucene.queries.function.valuesource.DoubleFieldSource

Direct Known Subclasses:

MultiValuedDoubleFieldSource

public class DoubleFieldSource
extends FieldCacheSource

Obtains double field values from LeafReader.getNumericDocValues(java.lang.String) and makes those values available as other numeric types, casting as needed.

Field Summary

Fields inherited from class org.apache.lucene.queries.function.valuesource.FieldCacheSource

field

Constructor Summary

Constructors

Constructor	Description
DoubleFieldSource(String field)

Method Summary

Modifier and Type	Method	Description
String	description()	description of field, used in explain()
boolean	equals(Object o)
protected NumericDocValues	getNumericDocValues(Map<Object,Object> context, LeafReaderContext readerContext)
SortField	getSortField(boolean reverse)	EXPERIMENTAL: This method is subject to change.
FunctionValues	getValues(Map<Object,Object> context, LeafReaderContext readerContext)	Gets the values for this reader and the context that was previously passed to createWeight().
int	hashCode()

Methods inherited from class org.apache.lucene.queries.function.valuesource.FieldCacheSource

getField

Methods inherited from class org.apache.lucene.queries.function.ValueSource

asDoubleValuesSource, asLongValuesSource, createWeight, fromDoubleValuesSource, newContext, toString

Methods inherited from class java.lang.Object

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

Constructor Details

DoubleFieldSource

public DoubleFieldSource(String field)

Method Details

description

public String description()

Description copied from class: ValueSource

description of field, used in explain()

Overrides:

description in class FieldCacheSource

getSortField

public SortField getSortField(boolean reverse)

Description copied from class: ValueSource

EXPERIMENTAL: This method is subject to change.

Get the SortField for this ValueSource. Uses the ValueSource.getValues(java.util.Map, org.apache.lucene.index.LeafReaderContext) to populate the SortField.

Overrides:

getSortField in class ValueSource

Parameters:

reverse - true if this is a reverse sort.

Returns:

The SortField for the ValueSource

getValues

public FunctionValues getValues(Map<Object,Object> context,
 LeafReaderContext readerContext)
                         throws IOException

Description copied from class: ValueSource

Gets the values for this reader and the context that was previously passed to createWeight(). The values must be consumed in a forward docID manner, and you must call this method again to iterate through the values again.

Specified by:

getValues in class ValueSource

Throws:

IOException

getNumericDocValues

protected NumericDocValues getNumericDocValues(Map<Object,Object> context,
 LeafReaderContext readerContext)
                                        throws IOException

Throws:

IOException

equals

public boolean equals(Object o)

Overrides:

equals in class FieldCacheSource

hashCode

public int hashCode()

Overrides:

hashCode in class FieldCacheSource