1dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond/* 2dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * Licensed to the Apache Software Foundation (ASF) under one or more 3dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * contributor license agreements. See the NOTICE file distributed with 4dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * this work for additional information regarding copyright ownership. 5dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * The ASF licenses this file to You under the Apache License, Version 2.0 6dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * (the "License"); you may not use this file except in compliance with 7dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * the License. You may obtain a copy of the License at 8dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * 9dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * http://www.apache.org/licenses/LICENSE-2.0 10dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * 11dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * Unless required by applicable law or agreed to in writing, software 12dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * distributed under the License is distributed on an "AS IS" BASIS, 13dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * See the License for the specific language governing permissions and 15dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * limitations under the License. 16dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond */ 17dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 18dee0849a9704d532af0b550146cbafbaa6ee1d19Raymondpackage org.apache.commons.math.stat.clustering; 19dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 20dee0849a9704d532af0b550146cbafbaa6ee1d19Raymondimport java.io.Serializable; 21dee0849a9704d532af0b550146cbafbaa6ee1d19Raymondimport java.util.Collection; 22dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 23dee0849a9704d532af0b550146cbafbaa6ee1d19Raymondimport org.apache.commons.math.util.MathUtils; 24dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 25dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond/** 26dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * A simple implementation of {@link Clusterable} for points with integer coordinates. 27dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * @version $Revision: 1042376 $ $Date: 2010-12-05 16:54:55 +0100 (dim. 05 déc. 2010) $ 28dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * @since 2.0 29dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond */ 30dee0849a9704d532af0b550146cbafbaa6ee1d19Raymondpublic class EuclideanIntegerPoint implements Clusterable<EuclideanIntegerPoint>, Serializable { 31dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 32dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** Serializable version identifier. */ 33dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond private static final long serialVersionUID = 3946024775784901369L; 34dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 35dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** Point coordinates. */ 36dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond private final int[] point; 37dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 38dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** 39dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * Build an instance wrapping an integer array. 40dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * <p>The wrapped array is referenced, it is <em>not</em> copied.</p> 41dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * @param point the n-dimensional point in integer space 42dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond */ 43dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public EuclideanIntegerPoint(final int[] point) { 44dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond this.point = point; 45dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 46dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 47dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** 48dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * Get the n-dimensional point in integer space. 49dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * @return a reference (not a copy!) to the wrapped array 50dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond */ 51dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public int[] getPoint() { 52dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return point; 53dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 54dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 55dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** {@inheritDoc} */ 56dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public double distanceFrom(final EuclideanIntegerPoint p) { 57dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return MathUtils.distance(point, p.getPoint()); 58dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 59dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 60dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** {@inheritDoc} */ 61dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public EuclideanIntegerPoint centroidOf(final Collection<EuclideanIntegerPoint> points) { 62dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond int[] centroid = new int[getPoint().length]; 63dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond for (EuclideanIntegerPoint p : points) { 64dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond for (int i = 0; i < centroid.length; i++) { 65dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond centroid[i] += p.getPoint()[i]; 66dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 67dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 68dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond for (int i = 0; i < centroid.length; i++) { 69dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond centroid[i] /= points.size(); 70dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 71dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return new EuclideanIntegerPoint(centroid); 72dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 73dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 74dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** {@inheritDoc} */ 75dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond @Override 76dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public boolean equals(final Object other) { 77dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond if (!(other instanceof EuclideanIntegerPoint)) { 78dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return false; 79dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 80dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond final int[] otherPoint = ((EuclideanIntegerPoint) other).getPoint(); 81dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond if (point.length != otherPoint.length) { 82dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return false; 83dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 84dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond for (int i = 0; i < point.length; i++) { 85dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond if (point[i] != otherPoint[i]) { 86dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return false; 87dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 88dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 89dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return true; 90dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 91dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 92dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** {@inheritDoc} */ 93dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond @Override 94dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public int hashCode() { 95dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond int hashCode = 0; 96dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond for (Integer i : point) { 97dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond hashCode += i.hashCode() * 13 + 7; 98dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 99dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return hashCode; 100dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 101dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 102dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond /** 103dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * {@inheritDoc} 104dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond * @since 2.1 105dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond */ 106dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond @Override 107dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond public String toString() { 108dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond final StringBuilder buff = new StringBuilder("("); 109dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond final int[] coordinates = getPoint(); 110dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond for (int i = 0; i < coordinates.length; i++) { 111dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond buff.append(coordinates[i]); 112dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond if (i < coordinates.length - 1) { 113dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond buff.append(","); 114dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 115dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 116dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond buff.append(")"); 117dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond return buff.toString(); 118dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond } 119dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond 120dee0849a9704d532af0b550146cbafbaa6ee1d19Raymond} 121