org.apache.lucene.facet.util

Class OrdinalMappingAtomicReader

java.lang.Object

org.apache.lucene.index.IndexReader

org.apache.lucene.index.AtomicReader

org.apache.lucene.index.FilterAtomicReader

org.apache.lucene.facet.util.OrdinalMappingAtomicReader

All Implemented Interfaces:

Closeable

public class OrdinalMappingAtomicReader
extends FilterAtomicReader

A FilterAtomicReader for updating facets ordinal references, based on an ordinal map. You should use this code in conjunction with merging taxonomies - after you merge taxonomies, you receive an DirectoryTaxonomyWriter.OrdinalMap which maps the 'old' ordinals to the 'new' ones. You can use that map to re-map the doc values which contain the facets information (ordinals) either before or while merging the indexes.

For re-mapping the ordinals during index merge, do the following:

 // merge the old taxonomy with the new one.
 OrdinalMap map = new MemoryOrdinalMap();
 DirectoryTaxonomyWriter.addTaxonomy(srcTaxoDir, map);
 int[] ordmap = map.getMap();
 
 // Add the index and re-map ordinals on the go
 DirectoryReader reader = DirectoryReader.open(oldDir);
 IndexWriterConfig conf = new IndexWriterConfig(VER, ANALYZER);
 IndexWriter writer = new IndexWriter(newDir, conf);
 List<AtomicReaderContext> leaves = reader.leaves();
   AtomicReader wrappedLeaves[] = new AtomicReader[leaves.size()];
   for (int i = 0; i < leaves.size(); i++) {
     wrappedLeaves[i] = new OrdinalMappingAtomicReader(leaves.get(i).reader(), ordmap);
   }
 writer.addIndexes(new MultiReader(wrappedLeaves));
 writer.commit();
 

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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.FilterAtomicReader

FilterAtomicReader.FilterDocsAndPositionsEnum, FilterAtomicReader.FilterDocsEnum, FilterAtomicReader.FilterFields, FilterAtomicReader.FilterTerms, FilterAtomicReader.FilterTermsEnum

Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader

IndexReader.ReaderClosedListener

Field Summary

Fields inherited from class org.apache.lucene.index.FilterAtomicReader

in

Constructor Summary

Constructors

Constructor and Description
OrdinalMappingAtomicReader(AtomicReader in, int[] ordinalMap) Wraps an AtomicReader, mapping ordinals according to the ordinalMap.
OrdinalMappingAtomicReader(AtomicReader in, int[] ordinalMap, FacetIndexingParams indexingParams) Wraps an AtomicReader, mapping ordinals according to the ordinalMap, using the provided indexingParams.

Method Summary

Methods

Modifier and Type	Method and Description
BinaryDocValues	getBinaryDocValues(String field)

Methods inherited from class org.apache.lucene.index.FilterAtomicReader

doClose, document, fields, getDocsWithField, getFieldInfos, getLiveDocs, getNormValues, getNumericDocValues, getSortedDocValues, getSortedSetDocValues, getTermVectors, maxDoc, numDocs, toString

Methods inherited from class org.apache.lucene.index.AtomicReader

docFreq, getContext, getDocCount, getSumDocFreq, getSumTotalTermFreq, hasNorms, termDocsEnum, termPositionsEnum, terms, totalTermFreq

Methods inherited from class org.apache.lucene.index.IndexReader

addReaderClosedListener, close, decRef, document, document, ensureOpen, equals, getCombinedCoreAndDeletesKey, getCoreCacheKey, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, numDeletedDocs, open, open, open, open, open, registerParentReader, removeReaderClosedListener, tryIncRef

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

OrdinalMappingAtomicReader

public OrdinalMappingAtomicReader(AtomicReader in,
                          int[] ordinalMap)

Wraps an AtomicReader, mapping ordinals according to the ordinalMap. Calls OrdinalMappingAtomicReader(in, ordinalMap, new DefaultFacetIndexingParams())

OrdinalMappingAtomicReader

public OrdinalMappingAtomicReader(AtomicReader in,
                          int[] ordinalMap,
                          FacetIndexingParams indexingParams)

Wraps an AtomicReader, mapping ordinals according to the ordinalMap, using the provided indexingParams.

Method Detail

getBinaryDocValues

public BinaryDocValues getBinaryDocValues(String field)
                                   throws IOException

Overrides:

getBinaryDocValues in class FilterAtomicReader

Throws:

IOException