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/*
* 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 static org.locationtech.spatial4j.distance.DistanceUtils.DEGREES_TO_RADIANS;
import java.io.IOException;
import java.util.Map;
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 org.locationtech.spatial4j.distance.DistanceUtils;
/** 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(Map