| /* |
| * 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.queries.function; |
| |
| import java.io.IOException; |
| import java.util.Objects; |
| import java.util.function.DoublePredicate; |
| |
| 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.DoubleValues; |
| import org.apache.lucene.search.DoubleValuesSource; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.QueryVisitor; |
| import org.apache.lucene.search.ScoreMode; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.TwoPhaseIterator; |
| import org.apache.lucene.search.Weight; |
| |
| /** |
| * A query that retrieves all documents with a {@link DoubleValues} value matching a predicate |
| * |
| * This query works by a linear scan of the index, and is best used in |
| * conjunction with other queries that can restrict the number of |
| * documents visited |
| */ |
| public final class FunctionMatchQuery extends Query { |
| |
| static final float DEFAULT_MATCH_COST = 100; |
| |
| private final DoubleValuesSource source; |
| private final DoublePredicate filter; |
| private final float matchCost; // not used in equals/hashCode |
| |
| /** |
| * Create a FunctionMatchQuery with default TwoPhaseIterator matchCost - |
| * {@link #DEFAULT_MATCH_COST} = {@value #DEFAULT_MATCH_COST} |
| * @param source a {@link DoubleValuesSource} to use for values |
| * @param filter the predicate to match against |
| */ |
| public FunctionMatchQuery(DoubleValuesSource source, DoublePredicate filter) { |
| this(source, filter, DEFAULT_MATCH_COST); |
| } |
| |
| /** |
| * Create a FunctionMatchQuery |
| * @param source a {@link DoubleValuesSource} to use for values |
| * @param filter the predicate to match against |
| * @param matchCost to be returned by {@link TwoPhaseIterator#matchCost()} |
| */ |
| public FunctionMatchQuery(DoubleValuesSource source, DoublePredicate filter, float matchCost) { |
| this.source = source; |
| this.filter = filter; |
| this.matchCost = matchCost; |
| } |
| |
| @Override |
| public String toString(String field) { |
| return "FunctionMatchQuery(" + source.toString() + ")"; |
| } |
| |
| @Override |
| public void visit(QueryVisitor visitor) { |
| visitor.visitLeaf(this); |
| } |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException { |
| DoubleValuesSource vs = source.rewrite(searcher); |
| return new ConstantScoreWeight(this, boost) { |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| DoubleValues values = vs.getValues(context, null); |
| DocIdSetIterator approximation = DocIdSetIterator.all(context.reader().maxDoc()); |
| TwoPhaseIterator twoPhase = new TwoPhaseIterator(approximation) { |
| @Override |
| public boolean matches() throws IOException { |
| return values.advanceExact(approximation.docID()) && filter.test(values.doubleValue()); |
| } |
| |
| @Override |
| public float matchCost() { |
| return matchCost; // TODO maybe DoubleValuesSource should have a matchCost? |
| } |
| }; |
| return new ConstantScoreScorer(this, score(), scoreMode, twoPhase); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return source.isCacheable(ctx); |
| } |
| |
| }; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| FunctionMatchQuery that = (FunctionMatchQuery) o; |
| return Objects.equals(source, that.source) && Objects.equals(filter, that.filter); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(source, filter); |
| } |
| |
| } |