| /* |
| * 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.function.distance; |
| import org.locationtech.spatial4j.distance.DistanceUtils; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.queries.function.docvalues.DoubleDocValues; |
| import org.apache.lucene.queries.function.valuesource.VectorValueSource; |
| import org.apache.lucene.search.IndexSearcher; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import static org.locationtech.spatial4j.distance.DistanceUtils.DEGREES_TO_RADIANS; |
| |
| /** |
| * Haversine function with one point constant |
| */ |
| public class HaversineConstFunction extends ValueSource { |
| |
| private final double latCenter; |
| private final double lonCenter; |
| private final VectorValueSource p2; // lat+lon, just saved for display/debugging |
| private final ValueSource latSource; |
| private final ValueSource lonSource; |
| |
| private final double latCenterRad_cos; // cos(latCenter) |
| private static final double EARTH_MEAN_DIAMETER = DistanceUtils.EARTH_MEAN_RADIUS_KM * 2; |
| |
| public HaversineConstFunction(double latCenter, double lonCenter, VectorValueSource vs) { |
| this.latCenter = latCenter; |
| this.lonCenter = lonCenter; |
| this.p2 = vs; |
| this.latSource = p2.getSources().get(0); |
| this.lonSource = p2.getSources().get(1); |
| this.latCenterRad_cos = Math.cos(latCenter * DEGREES_TO_RADIANS); |
| } |
| |
| protected String name() { |
| return "geodist"; |
| } |
| |
| @Override |
| public FunctionValues getValues(@SuppressWarnings({"rawtypes"})Map context, |
| LeafReaderContext readerContext) throws IOException { |
| @SuppressWarnings({"unchecked"}) |
| final FunctionValues latVals = latSource.getValues(context, readerContext); |
| @SuppressWarnings({"unchecked"}) |
| final FunctionValues lonVals = lonSource.getValues(context, readerContext); |
| final double latCenterRad = this.latCenter * DEGREES_TO_RADIANS; |
| final double lonCenterRad = this.lonCenter * DEGREES_TO_RADIANS; |
| final double latCenterRad_cos = this.latCenterRad_cos; |
| |
| return new DoubleDocValues(this) { |
| @Override |
| public double doubleVal(int doc) throws IOException { |
| double latRad = latVals.doubleVal(doc) * DEGREES_TO_RADIANS; |
| double lonRad = lonVals.doubleVal(doc) * DEGREES_TO_RADIANS; |
| double diffX = latCenterRad - latRad; |
| double diffY = lonCenterRad - lonRad; |
| double hsinX = Math.sin(diffX * 0.5); |
| double hsinY = Math.sin(diffY * 0.5); |
| double h = hsinX * hsinX + |
| (latCenterRad_cos * Math.cos(latRad) * hsinY * hsinY); |
| return (EARTH_MEAN_DIAMETER * Math.atan2(Math.sqrt(h), Math.sqrt(1 - h))); |
| } |
| @Override |
| public String toString(int doc) throws IOException { |
| return name() + '(' + latVals.toString(doc) + ',' + lonVals.toString(doc) + ',' + latCenter + ',' + lonCenter + ')'; |
| } |
| }; |
| } |
| |
| @Override |
| @SuppressWarnings({"unchecked"}) |
| public void createWeight(@SuppressWarnings({"rawtypes"})Map context, IndexSearcher searcher) throws IOException { |
| latSource.createWeight(context, searcher); |
| lonSource.createWeight(context, searcher); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof HaversineConstFunction)) return false; |
| HaversineConstFunction other = (HaversineConstFunction) o; |
| return this.latCenter == other.latCenter |
| && this.lonCenter == other.lonCenter |
| && this.p2.equals(other.p2); |
| |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = p2.hashCode(); |
| long temp; |
| temp = Double.doubleToRawLongBits(latCenter); |
| result = 31 * result + (int) (temp ^ (temp >>> 32)); |
| temp = Double.doubleToRawLongBits(lonCenter); |
| result = 31 * result + (int) (temp ^ (temp >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public String description() { |
| return name() + '(' + p2 + ',' + latCenter + ',' + lonCenter + ')'; |
| } |
| |
| } |