Package org.apache.lucene.facet.range

Class DoubleRangeFacetCounts

java.lang.Object

org.apache.lucene.facet.Facets

org.apache.lucene.facet.range.DoubleRangeFacetCounts

public class DoubleRangeFacetCounts
extends Facets

Facets implementation that computes counts for dynamic double ranges from a provided DoubleValuesSource. 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.). If you have indexed your field using FloatDocValuesField, then you should use a DoubleValuesSource generated from DoubleValuesSource.fromFloatField(String).

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
DoubleRangeFacetCounts(String field, FacetsCollector hits, DoubleRange... ranges)	Create RangeFacetCounts, using DoubleValues from the specified field.
DoubleRangeFacetCounts(String field, DoubleValuesSource valueSource, FacetsCollector hits, DoubleRange... ranges)	Create RangeFacetCounts using the provided DoubleValuesSource
DoubleRangeFacetCounts(String field, DoubleValuesSource valueSource, FacetsCollector hits, Query fastMatchQuery, DoubleRange... ranges)	Create RangeFacetCounts, using the provided DoubleValuesSource, and using the provided Query as a fastmatch: only documents matching the query are checked for the matching ranges.

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.
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

DoubleRangeFacetCounts

public DoubleRangeFacetCounts(String field,
                              FacetsCollector hits,
                              DoubleRange... ranges)
                       throws IOException

Create RangeFacetCounts, using DoubleValues from the specified field. N.B This assumes that the field was indexed with DoubleDocValuesField. For float-valued fields, use DoubleRangeFacetCounts(String, DoubleValuesSource, FacetsCollector, DoubleRange...)

Throws:

IOException

DoubleRangeFacetCounts

public DoubleRangeFacetCounts(String field,
                              DoubleValuesSource valueSource,
                              FacetsCollector hits,
                              DoubleRange... ranges)
                       throws IOException

Create RangeFacetCounts using the provided DoubleValuesSource

Throws:

IOException

DoubleRangeFacetCounts

public DoubleRangeFacetCounts(String field,
                              DoubleValuesSource valueSource,
                              FacetsCollector hits,
                              Query fastMatchQuery,
                              DoubleRange... ranges)
                       throws IOException

Create RangeFacetCounts, using the provided DoubleValuesSource, and using the provided Query as a fastmatch: only documents matching the query are checked for the matching ranges.

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

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