Package org.apache.lucene.facet

Class MultiLongValuesSource

java.lang.Object

org.apache.lucene.facet.MultiLongValuesSource

All Implemented Interfaces:

SegmentCacheable

public abstract class MultiLongValuesSource
extends Object
implements SegmentCacheable

Base class for producing MultiLongValues. See also LongValuesSource for a single-valued version.

MultiLongValuesSource objects for long and int-valued NumericDocValues/SortedNumericDocValues fields can be obtained by calling fromLongField(String) and fromIntField(String). This is valid for both multi-valued and single-valued fields.

To obtain a MultiLongValuesSource from a float or double-valued NumericDocValues/SortedNumericDocValues field, use MultiDoubleValuesSource.fromFloatField(String) or MultiDoubleValuesSource.fromDoubleField(String) and then call MultiDoubleValuesSource.toMultiLongValuesSource().

To obtain a MultiLongValuesSource from an existing LongValuesSource, see fromSingleValued(LongValuesSource). Instances created in this way can be "unwrapped" using unwrapSingleton(MultiLongValuesSource) if necessary. Note that scores are never provided to the underlying LongValuesSource. LongValuesSource.rewrite(IndexSearcher) will also never be called. The user should be aware of this if using a LongValuesSource 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
MultiLongValuesSource()	Instantiates a new MultiLongValuesSource

Method Summary

Modifier and Type	Method	Description
abstract boolean	equals(Object o)
static MultiLongValuesSource	fromIntField(String field)	Creates a MultiLongValuesSource that wraps an int-valued field
static MultiLongValuesSource	fromLongField(String field)	Creates a MultiLongValuesSource that wraps a long-valued field
static MultiLongValuesSource	fromSingleValued(LongValuesSource singleValued)	Creates a MultiLongValuesSource that wraps a single-valued LongValuesSource
abstract MultiLongValues	getValues(LeafReaderContext ctx)	Returns a MultiLongValues instance for the passed-in LeafReaderContext
abstract int	hashCode()
final MultiDoubleValuesSource	toMultiDoubleValuesSource()	Convert to a MultiDoubleValuesSource by casting long values to doubles
abstract String	toString()
static LongValuesSource	unwrapSingleton(MultiLongValuesSource in)	Returns a single-valued view of the MultiLongValuesSource if it was previously wrapped with fromSingleValued(LongValuesSource), 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

MultiLongValuesSource

public MultiLongValuesSource()

Instantiates a new MultiLongValuesSource

Method Details

getValues

public abstract MultiLongValues getValues(LeafReaderContext ctx)
                                   throws IOException

Returns a MultiLongValues 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

fromLongField

public static MultiLongValuesSource fromLongField(String field)

Creates a MultiLongValuesSource that wraps a long-valued field

fromIntField

public static MultiLongValuesSource fromIntField(String field)

Creates a MultiLongValuesSource that wraps an int-valued field

fromSingleValued

public static MultiLongValuesSource fromSingleValued(LongValuesSource singleValued)

Creates a MultiLongValuesSource that wraps a single-valued LongValuesSource

unwrapSingleton

public static LongValuesSource unwrapSingleton(MultiLongValuesSource in)

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

toMultiDoubleValuesSource

public final MultiDoubleValuesSource toMultiDoubleValuesSource()

Convert to a MultiDoubleValuesSource by casting long values to doubles