| package org.apache.lucene.spatial.vector; |
| |
| /* |
| * 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.distance.DistanceCalculator; |
| import com.spatial4j.core.shape.Point; |
| import org.apache.lucene.index.AtomicReader; |
| import org.apache.lucene.index.AtomicReaderContext; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.search.FieldCache; |
| import org.apache.lucene.util.Bits; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * An implementation of the Lucene ValueSource model that returns the distance |
| * for a {@link PointVectorStrategy}. |
| * |
| * @lucene.internal |
| */ |
| public class DistanceValueSource extends ValueSource { |
| |
| private PointVectorStrategy strategy; |
| private final Point from; |
| private final double multiplier; |
| |
| /** |
| * Constructor. |
| */ |
| public DistanceValueSource(PointVectorStrategy strategy, Point from, double multiplier) { |
| this.strategy = strategy; |
| this.from = from; |
| this.multiplier = multiplier; |
| } |
| |
| /** |
| * Returns the ValueSource description. |
| */ |
| @Override |
| public String description() { |
| return "DistanceValueSource("+strategy+", "+from+")"; |
| } |
| |
| /** |
| * Returns the FunctionValues used by the function query. |
| */ |
| @Override |
| public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException { |
| AtomicReader reader = readerContext.reader(); |
| |
| final FieldCache.Doubles ptX = FieldCache.DEFAULT.getDoubles(reader, strategy.getFieldNameX(), true); |
| final FieldCache.Doubles ptY = FieldCache.DEFAULT.getDoubles(reader, strategy.getFieldNameY(), true); |
| final Bits validX = FieldCache.DEFAULT.getDocsWithField(reader, strategy.getFieldNameX()); |
| final Bits validY = FieldCache.DEFAULT.getDocsWithField(reader, strategy.getFieldNameY()); |
| |
| return new FunctionValues() { |
| |
| private final Point from = DistanceValueSource.this.from; |
| private final DistanceCalculator calculator = strategy.getSpatialContext().getDistCalc(); |
| private final double nullValue = |
| (strategy.getSpatialContext().isGeo() ? 180 * multiplier : Double.MAX_VALUE); |
| |
| @Override |
| public float floatVal(int doc) { |
| return (float) doubleVal(doc); |
| } |
| |
| @Override |
| public double doubleVal(int doc) { |
| // make sure it has minX and area |
| if (validX.get(doc)) { |
| assert validY.get(doc); |
| return calculator.distance(from, ptX.get(doc), ptY.get(doc)) * multiplier; |
| } |
| return nullValue; |
| } |
| |
| @Override |
| public String toString(int doc) { |
| return description() + "=" + floatVal(doc); |
| } |
| }; |
| } |
| |
| @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(); |
| } |
| } |