Package org.apache.lucene.facet

Class LongValueFacetCounts

java.lang.Object

org.apache.lucene.facet.Facets

org.apache.lucene.facet.LongValueFacetCounts

public class LongValueFacetCounts
extends Facets

Facets implementation that computes counts for all unique long values, more efficiently counting small values (0-1023) using an int array, and switching to a HashMap for values above 1023. Retrieve all facet counts, in value order, with getAllChildrenSortByValue(), or get the topN values sorted by count with getTopChildrenSortByCount(int).

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

Constructor Summary

Constructors

Constructor	Description
LongValueFacetCounts(String field, FacetsCollector hits)	Create LongValueFacetCounts, using either single-valued NumericDocValues or multi-valued SortedNumericDocValues from the specified field (depending on what has been indexed).
LongValueFacetCounts(String field, IndexReader reader)	Counts all facet values for this reader.
LongValueFacetCounts(String field, LongValuesSource valueSource, FacetsCollector hits)	Create LongValueFacetCounts, using the provided LongValuesSource if non-null.
LongValueFacetCounts(String field, LongValuesSource valueSource, IndexReader reader)	Counts all facet values for the provided LongValuesSource if non-null.

Method Summary

Modifier and Type	Method	Description
FacetResult	getAllChildrenSortByValue()	Returns all unique values seen, sorted by value.
List<FacetResult>	getAllDims(int topN)	Returns topN labels for any dimension that had hits, sorted by the number of hits that dimension matched; this is used for "sparse" faceting, where many different dimensions were indexed, for example depending on the type of document.
Number	getSpecificValue(String dim, String... path)	Return the count or value for a specific path.
FacetResult	getTopChildren(int topN, String dim, String... path)	Returns the topN child labels under the specified path.
FacetResult	getTopChildrenSortByCount(int topN)	Returns the specified top number of facets, sorted by count.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LongValueFacetCounts

public LongValueFacetCounts(String field,
                            FacetsCollector hits)
                     throws IOException

Create LongValueFacetCounts, using either single-valued NumericDocValues or multi-valued SortedNumericDocValues from the specified field (depending on what has been indexed).

Throws:

IOException

LongValueFacetCounts

public LongValueFacetCounts(String field,
                            LongValuesSource valueSource,
                            FacetsCollector hits)
                     throws IOException

Create LongValueFacetCounts, using the provided LongValuesSource if non-null. If valueSource is null, doc values from the provided field will be used.

Throws:

IOException

LongValueFacetCounts

public LongValueFacetCounts(String field,
                            IndexReader reader)
                     throws IOException

Counts all facet values for this reader. This produces the same result as computing facets on a MatchAllDocsQuery, but is more efficient.

Throws:

IOException

LongValueFacetCounts

public LongValueFacetCounts(String field,
                            LongValuesSource valueSource,
                            IndexReader reader)
                     throws IOException

Counts all facet values for the provided LongValuesSource if non-null. If valueSource is null, doc values from the provided field will be used. This produces the same result as computing facets on a MatchAllDocsQuery, but is more efficient.

Throws:

IOException

Method Detail

getTopChildren

public FacetResult getTopChildren(int topN,
                                  String dim,
                                  String... path)

Description copied from class: Facets

Returns the topN child labels under the specified path. Returns null if the specified path doesn't exist or if this dimension was never seen.

Specified by:

getTopChildren in class Facets

getTopChildrenSortByCount

public FacetResult getTopChildrenSortByCount(int topN)

Returns the specified top number of facets, sorted by count.

getAllChildrenSortByValue

public FacetResult getAllChildrenSortByValue()

Returns all unique values seen, sorted by value.

getSpecificValue

public Number getSpecificValue(String dim,
                               String... path)

Description copied from class: Facets

Return the count or value for a specific path. Returns -1 if this path doesn't exist, else the count.

Specified by:

getSpecificValue in class Facets

getAllDims

public List<FacetResult> getAllDims(int topN)

Description copied from class: Facets

Returns topN labels for any dimension that had hits, sorted by the number of hits that dimension matched; this is used for "sparse" faceting, where many different dimensions were indexed, for example depending on the type of document.

Specified by:

getAllDims in class Facets

toString

public String toString()

Overrides:

toString in class Object