Package org.apache.lucene.facet.range

Class LongRangeFacetCounts

java.lang.Object

org.apache.lucene.facet.Facets

org.apache.lucene.facet.range.LongRangeFacetCounts

public class LongRangeFacetCounts
extends Facets

Facets implementation that computes counts for dynamic long ranges. Use this for dimensions that change in real-time (e.g. a relative time based dimension like "Past day", "Past 2 days", etc.) or that change for each request (e.g. distance from the user's location, "< 1 km", "< 2 km", etc.).

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

Field Summary

Fields

Modifier and Type	Field	Description
protected int[]	counts	Counts, initialized in by subclass.
protected Query	fastMatchQuery	Optional: if specified, we first test this Query to see whether the document should be checked for matching ranges.
protected String	field	Our field name.
protected Range[]	ranges	Ranges passed to constructor.
protected int	totCount	Total number of hits.

Constructor Summary

Constructors

Constructor	Description
LongRangeFacetCounts(String field, FacetsCollector hits, LongRange... ranges)	Create LongRangeFacetCounts using long values from the specified field.
LongRangeFacetCounts(String field, LongValuesSource valueSource, FacetsCollector hits, LongRange... ranges)	Create LongRangeFacetCounts, using the provided LongValuesSource if non-null.
LongRangeFacetCounts(String field, LongValuesSource valueSource, FacetsCollector hits, Query fastMatchQuery, LongRange... ranges)	Create LongRangeFacetCounts, using the provided LongValuesSource if non-null.

Method Summary

Modifier and Type	Method	Description
protected void	count(String field, List<FacetsCollector.MatchingDocs> matchingDocs)	Counts from the provided field.
protected DocIdSetIterator	createIterator(FacetsCollector.MatchingDocs hits)	Create a DocIdSetIterator from the provided hits that relies on fastMatchQuery if available for first-pass filtering.
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.
protected LongRange[]	getLongRanges()
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.
protected long	mapDocValue(long l)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

ranges

protected final Range[] ranges

Ranges passed to constructor.

counts

protected final int[] counts

Counts, initialized in by subclass.

fastMatchQuery

protected final Query fastMatchQuery

Optional: if specified, we first test this Query to see whether the document should be checked for matching ranges. If this is null, all documents are checked.

field

protected final String field

Our field name.

totCount

protected int totCount

Total number of hits.

Constructor Detail

LongRangeFacetCounts

public LongRangeFacetCounts(String field,
                            FacetsCollector hits,
                            LongRange... ranges)
                     throws IOException

Create LongRangeFacetCounts using long values from the specified field. The field may be single-valued (NumericDocValues) or multi-valued (SortedNumericDocValues), and will be interpreted as containing long values.

Throws:

IOException

LongRangeFacetCounts

public LongRangeFacetCounts(String field,
                            LongValuesSource valueSource,
                            FacetsCollector hits,
                            LongRange... ranges)
                     throws IOException

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

Throws:

IOException

LongRangeFacetCounts

public LongRangeFacetCounts(String field,
                            LongValuesSource valueSource,
                            FacetsCollector hits,
                            Query fastMatchQuery,
                            LongRange... ranges)
                     throws IOException

Create LongRangeFacetCounts, using the provided LongValuesSource if non-null. If valueSource is null, doc values from the provided field will be used. Use the provided Query as a fastmatch: only documents passing the filter are checked for the matching ranges, which is helpful when the provided LongValuesSource is costly per-document, such as a geo distance.

Throws:

IOException

Method Detail

getLongRanges

protected LongRange[] getLongRanges()

createIterator

protected DocIdSetIterator createIterator(FacetsCollector.MatchingDocs hits)
                                   throws IOException

Create a DocIdSetIterator from the provided hits that relies on fastMatchQuery if available for first-pass filtering. A null response indicates no documents will match.

Throws:

IOException

mapDocValue

protected long mapDocValue(long l)

count

protected void count(String field,
                     List<FacetsCollector.MatchingDocs> matchingDocs)
              throws IOException

Counts from the provided field.

Throws:

IOException

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

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

toString

public String toString()

Overrides:

toString in class Object