package org.apache.lucene.facet.taxonomy;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import java.util.List;
import org.apache.lucene.facet.FacetsCollector;
import org.apache.lucene.facet.FacetsCollector.MatchingDocs;
import org.apache.lucene.facet.FacetsConfig;
import org.apache.lucene.index.BinaryDocValues;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.util.BytesRef;
/** Computes facets counts, assuming the default encoding
* into DocValues was used.
*
* @lucene.experimental */
public class FastTaxonomyFacetCounts extends IntTaxonomyFacets {
/** Create {@code FastTaxonomyFacetCounts}, which also
* counts all facet labels. */
public FastTaxonomyFacetCounts(TaxonomyReader taxoReader, FacetsConfig config, FacetsCollector fc) throws IOException {
this(FacetsConfig.DEFAULT_INDEX_FIELD_NAME, taxoReader, config, fc);
}
/** Create {@code FastTaxonomyFacetCounts}, using the
* specified {@code indexFieldName} for ordinals. Use
* this if you had set {@link
* FacetsConfig#setIndexFieldName} to change the index
* field name for certain dimensions. */
public FastTaxonomyFacetCounts(String indexFieldName, TaxonomyReader taxoReader, FacetsConfig config, FacetsCollector fc) throws IOException {
super(indexFieldName, taxoReader, config);
count(fc.getMatchingDocs());
}
private final void count(List<MatchingDocs> matchingDocs) throws IOException {
for(MatchingDocs hits : matchingDocs) {
BinaryDocValues dv = hits.context.reader().getBinaryDocValues(indexFieldName);
if (dv == null) { // this reader does not have DocValues for the requested category list
continue;
}
DocIdSetIterator docs = hits.bits.iterator();
int doc;
while ((doc = docs.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
final BytesRef bytesRef = dv.get(doc);
byte[] bytes = bytesRef.bytes;
int end = bytesRef.offset + bytesRef.length;
int ord = 0;
int offset = bytesRef.offset;
int prev = 0;
while (offset < end) {
byte b = bytes[offset++];
if (b >= 0) {
prev = ord = ((ord << 7) | b) + prev;
++values[ord];
ord = 0;
} else {
ord = (ord << 7) | (b & 0x7F);
}
}
}
}
rollup();
}
}