Package org.apache.lucene.facet

Class MultiDoubleValuesSource

java.lang.Object

org.apache.lucene.facet.MultiDoubleValuesSource

All Implemented Interfaces:

SegmentCacheable

public abstract class MultiDoubleValuesSource
extends Object
implements SegmentCacheable

Base class for producing MultiDoubleValues. See also DoubleValuesSource for a single-valued version.

MultiDoubleValuesSource objects for NumericDocValues/SortedNumericDocValues fields can be obtained by calling fromFloatField(String), fromDoubleField(String), fromIntField(String), or fromLongField(String). If custom long-to-double logic is required, fromField(String, LongToDoubleFunction) can be used. This is valid for both multi-valued and single-valued fields.

To obtain a MultiDoubleValuesSource from an existing DoubleValuesSource, see fromSingleValued(DoubleValuesSource). Instances created in this way can be "unwrapped" using unwrapSingleton(MultiDoubleValuesSource) if necessary. Note that scores are never provided to the underlying DoubleValuesSource. DoubleValuesSource.rewrite(IndexSearcher) will also never be called. The user should be aware of this if using a DoubleValuesSource that relies on rewriting or scores. The faceting use-cases don't call rewrite or provide scores, which is why this simplification was made.

Currently meant only for use within the faceting module. Could be further generalized and made available for more use-cases outside faceting if there is a desire to do so.

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

Constructor Summary

Constructors

Constructor	Description
MultiDoubleValuesSource()	Instantiates a new MultiDoubleValuesSource

Method Summary

Modifier and Type	Method	Description
abstract boolean	equals(Object o)
static MultiDoubleValuesSource	fromDoubleField(String field)	Creates a MultiDoubleValuesSource that wraps a double-valued field
static MultiDoubleValuesSource	fromField(String field, LongToDoubleFunction decoder)	Creates a MultiDoubleValuesSource that wraps a generic NumericDocValues/SortedNumericDocValues field.
static MultiDoubleValuesSource	fromFloatField(String field)	Creates a MultiDoubleValuesSource that wraps a float-valued field
static MultiDoubleValuesSource	fromIntField(String field)	Creates a MultiDoubleValuesSource that wraps an int-valued field
static MultiDoubleValuesSource	fromLongField(String field)	Creates a MultiDoubleValuesSource that wraps a long-valued field
static MultiDoubleValuesSource	fromSingleValued(DoubleValuesSource singleValued)	Creates a MultiDoubleValuesSource that wraps a single-valued DoubleValuesSource
abstract MultiDoubleValues	getValues(LeafReaderContext ctx)	Returns a MultiDoubleValues instance for the passed-in LeafReaderContext
abstract int	hashCode()
final MultiLongValuesSource	toMultiLongValuesSource()	Convert to a MultiLongValuesSource by casting the double values to longs
abstract String	toString()
static DoubleValuesSource	unwrapSingleton(MultiDoubleValuesSource in)	Returns a single-valued view of the MultiDoubleValuesSource if it was previously wrapped with fromSingleValued(DoubleValuesSource), or null.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.search.SegmentCacheable

isCacheable

Constructor Details

MultiDoubleValuesSource

public MultiDoubleValuesSource()

Instantiates a new MultiDoubleValuesSource

Method Details

getValues

public abstract MultiDoubleValues getValues(LeafReaderContext ctx)
                                     throws IOException

Returns a MultiDoubleValues instance for the passed-in LeafReaderContext

Throws:

IOException

hashCode

public abstract int hashCode()

Overrides:

hashCode in class Object

equals

public abstract boolean equals(Object o)

Overrides:

equals in class Object

toString

public abstract String toString()

Overrides:

toString in class Object

fromField

public static MultiDoubleValuesSource fromField(String field,
 LongToDoubleFunction decoder)

Creates a MultiDoubleValuesSource that wraps a generic NumericDocValues/SortedNumericDocValues field. Uses the long-to-double decoding logic specified in decoder for converting the stored value to a double.

fromDoubleField

public static MultiDoubleValuesSource fromDoubleField(String field)

Creates a MultiDoubleValuesSource that wraps a double-valued field

fromFloatField

public static MultiDoubleValuesSource fromFloatField(String field)

Creates a MultiDoubleValuesSource that wraps a float-valued field

fromLongField

public static MultiDoubleValuesSource fromLongField(String field)

Creates a MultiDoubleValuesSource that wraps a long-valued field

fromIntField

public static MultiDoubleValuesSource fromIntField(String field)

Creates a MultiDoubleValuesSource that wraps an int-valued field

fromSingleValued

public static MultiDoubleValuesSource fromSingleValued(DoubleValuesSource singleValued)

Creates a MultiDoubleValuesSource that wraps a single-valued DoubleValuesSource

unwrapSingleton

public static DoubleValuesSource unwrapSingleton(MultiDoubleValuesSource in)

Returns a single-valued view of the MultiDoubleValuesSource if it was previously wrapped with fromSingleValued(DoubleValuesSource), or null.

toMultiLongValuesSource

public final MultiLongValuesSource toMultiLongValuesSource()

Convert to a MultiLongValuesSource by casting the double values to longs