Package org.apache.lucene.facet.sortedset

Class SortedSetDocValuesFacetCounts

java.lang.Object

org.apache.lucene.facet.Facets

org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts

public class SortedSetDocValuesFacetCounts
extends Facets

Compute facets counts from previously indexed SortedSetDocValuesFacetField, without require a separate taxonomy index. Faceting is a bit slower (~25%), and there is added cost on every IndexReader open to create a new SortedSetDocValuesReaderState. Furthermore, this does not support hierarchical facets; only flat (dimension + label) facets, but it uses quite a bit less RAM to do so.

NOTE: this class should be instantiated and then used from a single thread, because it holds a thread-private instance of SortedSetDocValues.

NOTE: tie-break is by unicode sort order

NOTE: if you have multi-valued dims that require dim counts (see FacetsConfig, make sure to provide your FacetsConfig instance when instantiating SortedSetDocValuesReaderState, or else dim counts can be inaccurate

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

Constructor Summary

Constructors

Constructor	Description
SortedSetDocValuesFacetCounts(SortedSetDocValuesReaderState state)	Returns all facet counts, same result as searching on MatchAllDocsQuery but faster.
SortedSetDocValuesFacetCounts(SortedSetDocValuesReaderState state, FacetsCollector hits)	Counts all facet dimensions across the provided hits.

Method Summary

Modifier and Type	Method	Description
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.
List<FacetResult>	getTopDims(int topNDims, int topNChildren)	Returns labels for topN dimensions and their topNChildren sorted by the number of hits/aggregated values that dimension matched; Results should be the same as calling getAllDims and then only using the first topNDims; Sub-classes may want to override this implementation with a more efficient one if they are able.

Methods inherited from class org.apache.lucene.facet.Facets

validateTopN

Methods inherited from class java.lang.Object

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

Constructor Detail

SortedSetDocValuesFacetCounts

public SortedSetDocValuesFacetCounts(SortedSetDocValuesReaderState state)
                              throws IOException

Returns all facet counts, same result as searching on MatchAllDocsQuery but faster.

Throws:

IOException

SortedSetDocValuesFacetCounts

public SortedSetDocValuesFacetCounts(SortedSetDocValuesReaderState state,
                                     FacetsCollector hits)
                              throws IOException

Counts all facet dimensions across the provided hits.

Throws:

IOException

Method Detail

getTopChildren

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

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

Throws:

IOException

getSpecificValue

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

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

Throws:

IOException

getAllDims

public List<FacetResult> getAllDims(int topN)
                             throws IOException

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

Throws:

IOException

getTopDims

public List<FacetResult> getTopDims(int topNDims,
                                    int topNChildren)
                             throws IOException

Description copied from class: Facets

Returns labels for topN dimensions and their topNChildren sorted by the number of hits/aggregated values that dimension matched; Results should be the same as calling getAllDims and then only using the first topNDims; Sub-classes may want to override this implementation with a more efficient one if they are able.

Overrides:

getTopDims in class Facets

Throws:

IOException