| /* |
| * 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.legacy; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.DoubleValues; |
| import org.apache.lucene.search.DoubleValuesSource; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.locationtech.spatial4j.distance.DistanceCalculator; |
| import org.locationtech.spatial4j.shape.Point; |
| |
| /** |
| * An implementation of the Lucene ValueSource model that returns the distance |
| * for a {@link PointVectorStrategy}. |
| * |
| * @lucene.internal |
| */ |
| public class DistanceValueSource extends DoubleValuesSource { |
| |
| private PointVectorStrategy strategy; |
| private final Point from; |
| private final double multiplier; |
| private final double nullValue; |
| |
| |
| /** |
| * Constructor. |
| */ |
| public DistanceValueSource(PointVectorStrategy strategy, Point from, double multiplier) { |
| this.strategy = strategy; |
| this.from = from; |
| this.multiplier = multiplier; |
| this.nullValue = |
| (strategy.getSpatialContext().isGeo() ? 180 * multiplier : Double.MAX_VALUE); |
| } |
| |
| /** |
| * Returns the ValueSource description. |
| */ |
| @Override |
| public String toString() { |
| return "DistanceValueSource("+strategy+", "+from+")"; |
| } |
| |
| /** |
| * Returns the FunctionValues used by the function query. |
| */ |
| @Override |
| public DoubleValues getValues(LeafReaderContext readerContext, DoubleValues scores) throws IOException { |
| |
| final DoubleValues ptX = DoubleValuesSource.fromDoubleField(strategy.getFieldNameX()).getValues(readerContext, null); |
| final DoubleValues ptY = DoubleValuesSource.fromDoubleField(strategy.getFieldNameY()).getValues(readerContext, null); |
| final DistanceCalculator calculator = strategy.getSpatialContext().getDistCalc(); |
| |
| return DoubleValues.withDefault(new DoubleValues() { |
| |
| @Override |
| public double doubleValue() throws IOException { |
| return calculator.distance(from, ptX.doubleValue(), ptY.doubleValue()) * multiplier; |
| } |
| |
| @Override |
| public boolean advanceExact(int doc) throws IOException { |
| return ptX.advanceExact(doc) && ptY.advanceExact(doc); |
| } |
| }, nullValue); |
| |
| } |
| |
| @Override |
| public boolean needsScores() { |
| return false; |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return DocValues.isCacheable(ctx, strategy.getFieldNameX(), strategy.getFieldNameY()); |
| } |
| |
| @Override |
| public DoubleValuesSource rewrite(IndexSearcher searcher) throws IOException { |
| return this; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| DistanceValueSource that = (DistanceValueSource) o; |
| |
| if (!from.equals(that.from)) return false; |
| if (!strategy.equals(that.strategy)) return false; |
| if (multiplier != that.multiplier) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return from.hashCode(); |
| } |
| } |