| /* |
| * 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.join; |
| |
| import java.io.IOException; |
| import java.util.Objects; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.ConstantScoreScorer; |
| import org.apache.lucene.search.ConstantScoreWeight; |
| import org.apache.lucene.search.DocIdSetIterator; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.QueryVisitor; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.Weight; |
| import org.apache.lucene.search.join.BitSetProducer; |
| import org.apache.lucene.search.join.QueryBitSetProducer; |
| import org.apache.lucene.search.join.ScoreMode; |
| import org.apache.lucene.search.join.ToParentBlockJoinQuery; |
| import org.apache.lucene.util.BitSet; |
| import org.apache.lucene.util.BitSetIterator; |
| import org.apache.solr.common.params.SolrParams; |
| import org.apache.solr.request.SolrQueryRequest; |
| import org.apache.solr.search.ExtendedQueryBase; |
| import org.apache.solr.search.QParser; |
| import org.apache.solr.search.SolrCache; |
| import org.apache.solr.search.SyntaxError; |
| |
| public class BlockJoinParentQParser extends FiltersQParser { |
| /** implementation detail subject to change */ |
| public static final String CACHE_NAME="perSegFilter"; |
| |
| protected String getParentFilterLocalParamName() { |
| return "which"; |
| } |
| |
| @Override |
| protected String getFiltersParamName() { |
| return "filters"; |
| } |
| |
| BlockJoinParentQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { |
| super(qstr, localParams, params, req); |
| } |
| |
| protected Query parseParentFilter() throws SyntaxError { |
| String filter = localParams.get(getParentFilterLocalParamName()); |
| QParser parentParser = subQuery(filter, null); |
| Query parentQ = parentParser.getQuery(); |
| return parentQ; |
| } |
| |
| @Override |
| protected Query wrapSubordinateClause(Query subordinate) throws SyntaxError { |
| String scoreMode = localParams.get("score", ScoreMode.None.name()); |
| Query parentQ = parseParentFilter(); |
| return createQuery(parentQ, subordinate, scoreMode); |
| } |
| |
| @Override |
| protected Query noClausesQuery() throws SyntaxError { |
| return new BitSetProducerQuery(getBitSetProducer(parseParentFilter())); |
| } |
| |
| protected Query createQuery(final Query parentList, Query query, String scoreMode) throws SyntaxError { |
| return new AllParentsAware(query, getBitSetProducer(parentList), ScoreModeParser.parse(scoreMode), parentList); |
| } |
| |
| BitSetProducer getBitSetProducer(Query query) { |
| return getCachedBitSetProducer(req, query); |
| } |
| |
| public static BitSetProducer getCachedBitSetProducer(final SolrQueryRequest request, Query query) { |
| @SuppressWarnings("unchecked") |
| SolrCache<Query, BitSetProducer> parentCache = request.getSearcher().getCache(CACHE_NAME); |
| // lazily retrieve from solr cache |
| if (parentCache != null) { |
| return parentCache.computeIfAbsent(query, QueryBitSetProducer::new); |
| } else { |
| return new QueryBitSetProducer(query); |
| } |
| } |
| |
| static final class AllParentsAware extends ToParentBlockJoinQuery { |
| private final Query parentQuery; |
| |
| private AllParentsAware(Query childQuery, BitSetProducer parentsFilter, ScoreMode scoreMode, |
| Query parentList) { |
| super(childQuery, parentsFilter, scoreMode); |
| parentQuery = parentList; |
| } |
| |
| public Query getParentQuery(){ |
| return parentQuery; |
| } |
| } |
| |
| /** A constant score query based on a {@link BitSetProducer}. */ |
| static class BitSetProducerQuery extends ExtendedQueryBase { |
| |
| final BitSetProducer bitSetProducer; |
| |
| public BitSetProducerQuery(BitSetProducer bitSetProducer) { |
| this.bitSetProducer = bitSetProducer; |
| setCache(false); // because we assume the bitSetProducer is itself cached |
| } |
| |
| @Override |
| public String toString(String field) { |
| return getClass().getSimpleName() + "(" + bitSetProducer + ")"; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| return sameClassAs(other) && Objects.equals(bitSetProducer, getClass().cast(other).bitSetProducer); |
| } |
| |
| @Override |
| public int hashCode() { |
| return classHash() + bitSetProducer.hashCode(); |
| } |
| |
| @Override |
| public void visit(QueryVisitor visitor) { |
| visitor.visitLeaf(this); |
| } |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher, org.apache.lucene.search.ScoreMode scoreMode, float boost) throws IOException { |
| return new ConstantScoreWeight(BitSetProducerQuery.this, boost) { |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| BitSet bitSet = bitSetProducer.getBitSet(context); |
| if (bitSet == null) { |
| return null; |
| } |
| DocIdSetIterator disi = new BitSetIterator(bitSet, bitSet.approximateCardinality()); |
| return new ConstantScoreScorer(this, boost, scoreMode, disi); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return getCache(); |
| } |
| }; |
| } |
| } |
| |
| } |