| /* |
| * 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.client.solrj.io.eval; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| import org.apache.commons.math3.geometry.enclosing.EnclosingBall; |
| import org.apache.commons.math3.geometry.enclosing.WelzlEncloser; |
| import org.apache.commons.math3.geometry.euclidean.twod.DiskGenerator; |
| import org.apache.commons.math3.geometry.euclidean.twod.Euclidean2D; |
| import org.apache.commons.math3.geometry.euclidean.twod.Vector2D; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| public class EnclosingDiskEvaluator extends RecursiveObjectEvaluator implements ManyValueWorker { |
| protected static final long serialVersionUID = 1L; |
| |
| public EnclosingDiskEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{ |
| super(expression, factory); |
| } |
| |
| @Override |
| public Object doWork(Object... objects) throws IOException{ |
| |
| if(objects[0] instanceof Matrix) { |
| return getEnclosingDisk((Matrix)objects[0]); |
| } else { |
| throw new IOException("The enclosingDisk function operates on a matrix of 2D vectors"); |
| } |
| } |
| |
| @SuppressWarnings({"rawtypes"}) |
| public static EnclosingBall getEnclosingDisk(Matrix matrix) throws IOException { |
| double[][] data = matrix.getData(); |
| List<Vector2D> points = new ArrayList<>(data.length); |
| if(data[0].length == 2) { |
| for(double[] row : data) { |
| points.add(new Vector2D(row[0], row[1])); |
| } |
| |
| |
| @SuppressWarnings({"unchecked"}) |
| WelzlEncloser<Euclidean2D, Vector2D> welzlEncloser = new WelzlEncloser(.001, new DiskGenerator()); |
| EnclosingBall enclosingBall = welzlEncloser.enclose(points); |
| return enclosingBall; |
| } else { |
| throw new IOException("The enclosingDisk function operates on a matrix of 2D vectors"); |
| } |
| } |
| |
| } |