| package org.apache.lucene.spatial.util; |
| |
| /* |
| * 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. |
| */ |
| |
| import com.spatial4j.core.context.SpatialContext; |
| import com.spatial4j.core.distance.DistanceCalculator; |
| import com.spatial4j.core.shape.Point; |
| import com.spatial4j.core.shape.Shape; |
| import org.apache.lucene.index.AtomicReaderContext; |
| 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.search.Explanation; |
| import org.apache.lucene.search.IndexSearcher; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * The distance from a provided Point to a Point retrieved from a ValueSource via |
| * {@link org.apache.lucene.queries.function.FunctionValues#objectVal(int)}. The distance |
| * is calculated via a {@link com.spatial4j.core.distance.DistanceCalculator}. |
| * |
| * @lucene.experimental |
| */ |
| public class DistanceToShapeValueSource extends ValueSource { |
| private final ValueSource shapeValueSource; |
| private final Point queryPoint; |
| private final double multiplier; |
| private final DistanceCalculator distCalc; |
| |
| //TODO if FunctionValues returns NaN; will things be ok? |
| private final double nullValue;//computed |
| |
| public DistanceToShapeValueSource(ValueSource shapeValueSource, Point queryPoint, |
| double multiplier, SpatialContext ctx) { |
| this.shapeValueSource = shapeValueSource; |
| this.queryPoint = queryPoint; |
| this.multiplier = multiplier; |
| this.distCalc = ctx.getDistCalc(); |
| this.nullValue = |
| (ctx.isGeo() ? 180 * multiplier : Double.MAX_VALUE); |
| } |
| |
| @Override |
| public String description() { |
| return "distance(" + queryPoint + " to " + shapeValueSource.description() + ")*" + multiplier + ")"; |
| } |
| |
| @Override |
| public void createWeight(Map context, IndexSearcher searcher) throws IOException { |
| shapeValueSource.createWeight(context, searcher); |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException { |
| final FunctionValues shapeValues = shapeValueSource.getValues(context, readerContext); |
| |
| return new DoubleDocValues(this) { |
| @Override |
| public double doubleVal(int doc) { |
| Shape shape = (Shape) shapeValues.objectVal(doc); |
| if (shape == null || shape.isEmpty()) |
| return nullValue; |
| Point pt = shape.getCenter(); |
| return distCalc.distance(queryPoint, pt) * multiplier; |
| } |
| |
| @Override |
| public Explanation explain(int doc) { |
| Explanation exp = super.explain(doc); |
| exp.addDetail(shapeValues.explain(doc)); |
| return exp; |
| } |
| }; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| DistanceToShapeValueSource that = (DistanceToShapeValueSource) o; |
| |
| if (!queryPoint.equals(that.queryPoint)) return false; |
| if (Double.compare(that.multiplier, multiplier) != 0) return false; |
| if (!shapeValueSource.equals(that.shapeValueSource)) return false; |
| if (!distCalc.equals(that.distCalc)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result; |
| long temp; |
| result = shapeValueSource.hashCode(); |
| result = 31 * result + queryPoint.hashCode(); |
| temp = Double.doubleToLongBits(multiplier); |
| result = 31 * result + (int) (temp ^ (temp >>> 32)); |
| return result; |
| } |
| } |