| /* |
| * 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.lucene.spatial.composite; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.search.ConstantScoreScorer; |
| import org.apache.lucene.search.ConstantScoreWeight; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.TwoPhaseIterator; |
| import org.apache.lucene.search.Weight; |
| import org.apache.lucene.util.Bits; |
| |
| /** |
| * A Query that considers an "indexQuery" to have approximate results, and a follow-on |
| * {@link ValueSource}/{@link FunctionValues#boolVal(int)} is called to verify each hit |
| * from {@link TwoPhaseIterator#matches()}. |
| * |
| * @lucene.experimental |
| */ |
| public class CompositeVerifyQuery extends Query { |
| final Query indexQuery;//approximation (matches more than needed) |
| final ValueSource predicateValueSource;//we call boolVal(doc) |
| |
| public CompositeVerifyQuery(Query indexQuery, ValueSource predicateValueSource) { |
| this.indexQuery = indexQuery; |
| this.predicateValueSource = predicateValueSource; |
| } |
| |
| @Override |
| public Query rewrite(IndexReader reader) throws IOException { |
| final Query rewritten = indexQuery.rewrite(reader); |
| if (rewritten != indexQuery) { |
| return new CompositeVerifyQuery(rewritten, predicateValueSource); |
| } |
| return super.rewrite(reader); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| if (!super.equals(o)) return false; |
| |
| CompositeVerifyQuery that = (CompositeVerifyQuery) o; |
| |
| if (!indexQuery.equals(that.indexQuery)) return false; |
| if (!predicateValueSource.equals(that.predicateValueSource)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = super.hashCode(); |
| result = 31 * result + indexQuery.hashCode(); |
| result = 31 * result + predicateValueSource.hashCode(); |
| return result; |
| } |
| |
| @Override |
| public String toString(String field) { |
| //TODO verify this looks good |
| return getClass().getSimpleName() + "(" + indexQuery.toString(field) + ", " + predicateValueSource + ")"; |
| } |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher, boolean needsScores) throws IOException { |
| final Weight indexQueryWeight = indexQuery.createWeight(searcher, false);//scores aren't unsupported |
| final Map valueSourceContext = ValueSource.newContext(searcher); |
| |
| return new ConstantScoreWeight(this) { |
| |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| |
| final Scorer indexQueryScorer = indexQueryWeight.scorer(context); |
| if (indexQueryScorer == null) { |
| return null; |
| } |
| |
| final FunctionValues predFuncValues = predicateValueSource.getValues(valueSourceContext, context); |
| |
| final TwoPhaseIterator twoPhaseIterator = new TwoPhaseIterator(indexQueryScorer.iterator()) { |
| @Override |
| public boolean matches() throws IOException { |
| return predFuncValues.boolVal(indexQueryScorer.docID()); |
| } |
| |
| @Override |
| public float matchCost() { |
| return 100; // TODO: use cost of predFuncValues.boolVal() |
| } |
| }; |
| |
| return new ConstantScoreScorer(this, score(), twoPhaseIterator); |
| } |
| }; |
| } |
| } |