| 1 | /* |
| 2 | * Copyright 2001-2005 Daniel F. Savarese |
| 3 | * Copyright 2006-2009 Savarese Software Research Corporation |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * https://www.savarese.com/software/ApacheLicense-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | package com.savarese.spatial; |
| 19 | |
| 20 | /** |
| 21 | * A Point implementation supporting k dimensions. |
| 22 | */ |
| 23 | public class GenericPoint<Coord extends Comparable<? super Coord>> |
| 24 | implements Point<Coord> |
| 25 | { |
| 26 | private Comparable<? super Coord>[] __coordinates; |
| 27 | |
| 28 | /** |
| 29 | * Constructs a GenericPoint with the specified dimensions. |
| 30 | * |
| 31 | * @param dimensions The number of dimensions in the point. Must be |
| 32 | * greater than 0. |
| 33 | */ |
| 34 | public GenericPoint(int dimensions) { |
| 35 | assert(dimensions > 0); |
| 36 | __coordinates = new Comparable[dimensions]; |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Two-dimensional convenience constructor. |
| 41 | * |
| 42 | * @param x The coordinate value of the first dimension. |
| 43 | * @param y The coordinate value of the second dimension. |
| 44 | */ |
| 45 | public GenericPoint(Coord x, Coord y) { |
| 46 | this(2); |
| 47 | setCoord(0, x); |
| 48 | setCoord(1, y); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Three-dimensional convenience constructor. |
| 53 | * |
| 54 | * @param x The coordinate value of the first dimension. |
| 55 | * @param y The coordinate value of the second dimension. |
| 56 | * @param z The coordinate value of the third dimension. |
| 57 | */ |
| 58 | public GenericPoint(Coord x, Coord y, Coord z) { |
| 59 | this(3); |
| 60 | setCoord(0, x); |
| 61 | setCoord(1, y); |
| 62 | setCoord(2, z); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Four-dimensional convenience constructor. |
| 67 | * |
| 68 | * @param x The coordinate value of the first dimension. |
| 69 | * @param y The coordinate value of the second dimension. |
| 70 | * @param z The coordinate value of the third dimension. |
| 71 | * @param w The coordinate value of the fourth dimension. |
| 72 | */ |
| 73 | public GenericPoint(Coord x, Coord y, Coord z, Coord w) { |
| 74 | this(4); |
| 75 | setCoord(0, x); |
| 76 | setCoord(1, y); |
| 77 | setCoord(2, z); |
| 78 | setCoord(3, w); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Sets the value of the coordinate for the specified dimension. |
| 83 | * |
| 84 | * @param dimension The dimension (starting from 0) of the |
| 85 | * coordinate value to set. |
| 86 | * @param value The new value of the coordinate. |
| 87 | * @exception ArrayIndexOutOfBoundsException If the dimension is |
| 88 | * outside of the range [0,getDimensions()-1]. |
| 89 | */ |
| 90 | public void setCoord(int dimension, Coord value) |
| 91 | throws ArrayIndexOutOfBoundsException |
| 92 | { |
| 93 | __coordinates[dimension] = value; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Returns the value of the coordinate for the specified dimension. |
| 98 | * |
| 99 | * @param dimension The dimension (starting from 0) of the |
| 100 | * coordinate value to retrieve. |
| 101 | * @return The value of the coordinate for the specified dimension. |
| 102 | * @exception ArrayIndexOutOfBoundsException If the dimension is |
| 103 | * outside of the range [0,getDimensions()-1]. |
| 104 | */ |
| 105 | public Coord getCoord(int dimension) { |
| 106 | return (Coord)__coordinates[dimension]; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Returns the number of dimensions of the point. |
| 111 | * |
| 112 | * @return The number of dimensions of the point. |
| 113 | */ |
| 114 | public int getDimensions() { return __coordinates.length; } |
| 115 | |
| 116 | /** |
| 117 | * Returns the hash code value for this point. |
| 118 | * |
| 119 | * @return The hash code value for this point. |
| 120 | */ |
| 121 | public int hashCode() { |
| 122 | int hash = 0; |
| 123 | for(Comparable<? super Coord> c : __coordinates) |
| 124 | hash+=c.hashCode(); |
| 125 | return hash; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Returns true if the specified object is equal to the GenericPoint. |
| 130 | * |
| 131 | * @param obj The object to test for equality. |
| 132 | * @return true if the specified object is equal to the |
| 133 | * GenericPoint, false if not. |
| 134 | */ |
| 135 | public boolean equals(Object obj) { |
| 136 | if(!(obj instanceof GenericPoint)) |
| 137 | return false; |
| 138 | |
| 139 | GenericPoint point = (GenericPoint)obj; |
| 140 | |
| 141 | for(int i = 0; i < __coordinates.length; ++i) |
| 142 | if(!__coordinates[i].equals(point.getCoord(i))) |
| 143 | return false; |
| 144 | |
| 145 | return true; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Returns a copy of the point. |
| 150 | * |
| 151 | * @return A copy of the point. |
| 152 | */ |
| 153 | public Object clone() { |
| 154 | GenericPoint<Coord> point = |
| 155 | new GenericPoint<Coord>(__coordinates.length); |
| 156 | for(int i = 0; i < __coordinates.length; ++i) |
| 157 | point.setCoord(i, (Coord)__coordinates[i]); |
| 158 | return point; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Returns a string representation of the point, listing its |
| 163 | * coordinate values in order. |
| 164 | * |
| 165 | * @return A string representation of the point. |
| 166 | */ |
| 167 | public String toString() { |
| 168 | StringBuffer buffer = new StringBuffer(); |
| 169 | |
| 170 | buffer.append("[ "); |
| 171 | buffer.append(__coordinates[0].toString()); |
| 172 | |
| 173 | for(int i = 1; i < __coordinates.length; ++i) { |
| 174 | buffer.append(", "); |
| 175 | buffer.append(__coordinates[i].toString()); |
| 176 | } |
| 177 | |
| 178 | buffer.append(" ]"); |
| 179 | |
| 180 | return buffer.toString(); |
| 181 | } |
| 182 | } |
