org.apache.solr.search.facet.BlockJoin Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.solr.search.facet;
import java.io.IOException;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.util.FixedBitSet;
import org.apache.solr.search.BitDocSet;
import org.apache.solr.search.DocIterator;
import org.apache.solr.search.DocSet;
import org.apache.solr.search.DocSetCollector;
import org.apache.solr.search.QueryContext;
/** @lucene.experimental */
public class BlockJoin {
/** acceptDocs will normally be used to avoid deleted documents from being generated as part of the answer DocSet (just use *:*)
* although it can be used to further constrain the generated documents.
*/
public static DocSet toChildren(DocSet parentInput, BitDocSet parentList, DocSet acceptDocs, QueryContext qcontext) throws IOException {
FixedBitSet parentBits = parentList.getBits();
DocSetCollector collector = new DocSetCollector(qcontext.searcher().maxDoc());
DocIterator iter = parentInput.iterator();
while (iter.hasNext()) {
int parentDoc = iter.nextDoc();
if (!parentList.exists(parentDoc) || parentDoc == 0) { // test for parentDoc==0 here to avoid passing -1 to prevSetBit later on
// not a parent, or parent has no children
continue;
}
int prevParent = parentBits.prevSetBit(parentDoc - 1);
for (int childDoc = prevParent+1; childDoc