| /* |
| * 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 java.io.IOException; |
| |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.valuesource.MultiValueSource; |
| |
| /** |
| * While not strictly a distance, the Sq. Euclidean Distance is often all that is needed in many applications |
| * that require a distance, thus saving a sq. rt. calculation |
| */ |
| public class SquaredEuclideanFunction extends VectorDistanceFunction { |
| protected String name = "sqedist"; |
| |
| public SquaredEuclideanFunction(MultiValueSource source1, MultiValueSource source2) { |
| super(-1, source1, source2);//overriding distance, so power doesn't matter here |
| } |
| |
| |
| @Override |
| protected String name() { |
| |
| return name; |
| } |
| |
| /** |
| * @param doc The doc to score |
| */ |
| @Override |
| protected double distance(int doc, FunctionValues dv1, FunctionValues dv2) throws IOException { |
| |
| double[] vals1 = new double[source1.dimension()]; |
| double[] vals2 = new double[source1.dimension()]; |
| dv1.doubleVal(doc, vals1); |
| dv2.doubleVal(doc, vals2); |
| |
| return distSquaredCartesian(vals1, vals2); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (!(o instanceof SquaredEuclideanFunction)) return false; |
| if (!super.equals(o)) return false; |
| |
| SquaredEuclideanFunction that = (SquaredEuclideanFunction) o; |
| |
| if (!name.equals(that.name)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = super.hashCode(); |
| result = 31 * result + name.hashCode(); |
| return result; |
| } |
| } |