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

Class SortedSetFieldSource

java.lang.Object

org.apache.lucene.queries.function.ValueSource

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

org.apache.lucene.queries.function.valuesource.SortedSetFieldSource

public class SortedSetFieldSource
extends FieldCacheSource

Retrieves FunctionValues instances for multi-valued string based fields.

A SortedSetDocValues contains multiple values for a field, so this technique "selects" a value as the representative value for the document.

See Also:

SortedSetSelector

Field Summary

Fields

Modifier and Type	Field	Description
protected SortedSetSelector.Type	selector

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

field

Constructor Summary

Constructors

Constructor	Description
SortedSetFieldSource(String field)
SortedSetFieldSource(String field, SortedSetSelector.Type selector)

Method Summary

Modifier and Type	Method	Description
String	description()	description of field, used in explain()
boolean	equals(Object obj)
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

Field Detail

selector

protected final SortedSetSelector.Type selector

Constructor Detail

SortedSetFieldSource

public SortedSetFieldSource(String field)

SortedSetFieldSource

public SortedSetFieldSource(String field,
                            SortedSetSelector.Type selector)

Method Detail

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

description

public String description()

Description copied from class: ValueSource

description of field, used in explain()

Overrides:

description in class FieldCacheSource

hashCode

public int hashCode()

Overrides:

hashCode in class FieldCacheSource

equals

public boolean equals(Object obj)

Overrides:

equals in class FieldCacheSource