| /* |
| * 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.lucene.spatial.util; |
| |
| import com.spatial4j.core.shape.Shape; |
| |
| 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.BoolDocValues; |
| import org.apache.lucene.search.Explanation; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.spatial.query.SpatialOperation; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * A boolean ValueSource that compares a shape from a provided ValueSource with a given Shape and sees |
| * if it matches a given {@link SpatialOperation} (the predicate). |
| * |
| * @lucene.experimental |
| */ |
| public class ShapePredicateValueSource extends ValueSource { |
| private final ValueSource shapeValuesource;//the left hand side |
| private final SpatialOperation op; |
| private final Shape queryShape;//the right hand side (constant) |
| |
| /** |
| * |
| * @param shapeValuesource Must yield {@link Shape} instances from its objectVal(doc). If null |
| * then the result is false. This is the left-hand (indexed) side. |
| * @param op the predicate |
| * @param queryShape The shape on the right-hand (query) side. |
| */ |
| public ShapePredicateValueSource(ValueSource shapeValuesource, SpatialOperation op, Shape queryShape) { |
| this.shapeValuesource = shapeValuesource; |
| this.op = op; |
| this.queryShape = queryShape; |
| } |
| |
| @Override |
| public String description() { |
| return shapeValuesource + " " + op + " " + queryShape; |
| } |
| |
| @Override |
| public void createWeight(Map context, IndexSearcher searcher) throws IOException { |
| shapeValuesource.createWeight(context, searcher); |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| final FunctionValues shapeValues = shapeValuesource.getValues(context, readerContext); |
| |
| return new BoolDocValues(this) { |
| @Override |
| public boolean boolVal(int doc) { |
| Shape indexedShape = (Shape) shapeValues.objectVal(doc); |
| if (indexedShape == null) |
| return false; |
| return op.evaluate(indexedShape, queryShape); |
| } |
| |
| @Override |
| public Explanation explain(int doc) { |
| Explanation exp = super.explain(doc); |
| List<Explanation> details = new ArrayList<>(Arrays.asList(exp.getDetails())); |
| details.add(shapeValues.explain(doc)); |
| return Explanation.match(exp.getValue(), exp.getDescription(), details); |
| } |
| }; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| ShapePredicateValueSource that = (ShapePredicateValueSource) o; |
| |
| if (!shapeValuesource.equals(that.shapeValuesource)) return false; |
| if (!op.equals(that.op)) return false; |
| if (!queryShape.equals(that.queryShape)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = shapeValuesource.hashCode(); |
| result = 31 * result + op.hashCode(); |
| result = 31 * result + queryShape.hashCode(); |
| return result; |
| } |
| } |