org.apache.lucene.facet.sortedset
Class SortedSetDocValuesReaderState

java.lang.Object
  org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState

public final class SortedSetDocValuesReaderState
extends Object

Wraps a IndexReader and resolves ords using existing SortedSetDocValues APIs without a separate taxonomy index. This only supports flat facets (dimension + label), and it makes faceting a bit slower, adds some cost at reopen time, but avoids managing the separate taxonomy index. It also requires less RAM than the taxonomy index, as it manages the flat (2-level) hierarchy more efficiently. In addition, the tie-break during faceting is now meaningful (in label sorted order).

NOTE: creating an instance of this class is somewhat costly, as it computes per-segment ordinal maps, so you should create it once and re-use that one instance for a given IndexReader.

Field Summary

static String

FACET_FIELD_EXTENSION Extension added to CategoryListParams.field to determin which field to read/write facet ordinals from/to.

Constructor Summary

SortedSetDocValuesReaderState(FacetIndexingParams fip, IndexReader reader)
Create an instance, scanning the SortedSetDocValues from the provided reader and FacetIndexingParams.

SortedSetDocValuesReaderState(IndexReader reader)
Create an instance, scanning the SortedSetDocValues from the provided reader, with default FacetIndexingParams.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

FACET_FIELD_EXTENSION

public static final String FACET_FIELD_EXTENSION

Extension added to CategoryListParams.field to determin which field to read/write facet ordinals from/to.

See Also:

Constant Field Values

Constructor Detail

SortedSetDocValuesReaderState

public SortedSetDocValuesReaderState(IndexReader reader)
                              throws IOException

Create an instance, scanning the SortedSetDocValues from the provided reader, with default FacetIndexingParams.

Throws:

IOException

SortedSetDocValuesReaderState

public SortedSetDocValuesReaderState(FacetIndexingParams fip,
                                     IndexReader reader)
                              throws IOException

Create an instance, scanning the SortedSetDocValues from the provided reader and FacetIndexingParams.

Throws:

IOException