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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------- 28: * ArrayUtilities.java 29: * ------------------- 30: * (C) Copyright 2003-2005, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: ArrayUtilities.java,v 1.6 2006/07/04 10:20:40 taqua Exp $ 36: * 37: * Changes 38: * ------- 39: * 21-Aug-2003 : Version 1 (DG); 40: * 04-Oct-2004 : Renamed ArrayUtils --> ArrayUtilities (DG); 41: * 42: */ 43: 44: package org.jfree.util; 45: 46: import java.util.Arrays; 47: 48: /** 49: * Utility methods for working with arrays. 50: * 51: * @author David Gilbert 52: */ 53: public class ArrayUtilities { 54: 55: /** 56: * Private constructor prevents object creation. 57: */ 58: private ArrayUtilities() { 59: } 60: 61: /** 62: * Clones a two dimensional array of floats. 63: * 64: * @param array the array. 65: * 66: * @return A clone of the array. 67: */ 68: public static float[][] clone(final float[][] array) { 69: 70: if (array == null) { 71: return null; 72: } 73: final float[][] result = new float[array.length][]; 74: System.arraycopy(array, 0, result, 0, array.length); 75: 76: for (int i = 0; i < array.length; i++) { 77: final float[] child = array[i]; 78: final float[] copychild = new float[child.length]; 79: System.arraycopy(child, 0, copychild, 0, child.length); 80: result[i] = copychild; 81: } 82: 83: return result; 84: 85: } 86: 87: /** 88: * Returns <code>true</code> if all the references in <code>array1</code> 89: * are equal to all the references in <code>array2</code> (two 90: * <code>null</code> references are considered equal for this test). 91: * 92: * @param array1 the first array (<code>null</code> permitted). 93: * @param array2 the second array (<code>null</code> permitted). 94: * 95: * @return A boolean. 96: */ 97: public static boolean equalReferencesInArrays(final Object[] array1, 98: final Object[] array2) { 99: if (array1 == null) { 100: return (array2 == null); 101: } 102: if (array2 == null) { 103: return false; 104: } 105: if (array1.length != array2.length) { 106: return false; 107: } 108: for (int i = 0; i < array1.length; i++) { 109: if (array1[i] == null) { 110: if (array2[i] != null) { 111: return false; 112: } 113: } 114: if (array2[i] == null) { 115: if (array1[i] != null) { 116: return false; 117: } 118: } 119: if (array1[i] != array2[i]) { 120: return false; 121: } 122: } 123: return true; 124: } 125: 126: /** 127: * Tests two float arrays for equality. 128: * 129: * @param array1 the first array (<code>null</code> permitted). 130: * @param array2 the second arrray (<code>null</code> permitted). 131: * 132: * @return A boolean. 133: */ 134: public static boolean equal(final float[][] array1, 135: final float[][] array2) { 136: if (array1 == null) { 137: return (array2 == null); 138: } 139: 140: if (array2 == null) { 141: return false; 142: } 143: 144: if (array1.length != array2.length) { 145: return false; 146: } 147: 148: for (int i = 0; i < array1.length; i++) { 149: if (!Arrays.equals(array1[i], array2[i])) { 150: return false; 151: } 152: } 153: return true; 154: } 155: 156: /** 157: * Returns <code>true</code> if any two items in the array are equal to 158: * one another. Any <code>null</code> values in the array are ignored. 159: * 160: * @param array the array to check. 161: * 162: * @return A boolean. 163: */ 164: public static boolean hasDuplicateItems(final Object[] array) { 165: for (int i = 0; i < array.length; i++) { 166: for (int j = 0; j < i; j++) { 167: final Object o1 = array[i]; 168: final Object o2 = array[j]; 169: if (o1 != null && o2 != null) { 170: if (o1.equals(o2)) { 171: return true; 172: } 173: } 174: } 175: } 176: return false; 177: } 178: 179: public static int compareVersionArrays (Comparable[] a1, Comparable[] a2) 180: { 181: int length = Math.min (a1.length, a2.length); 182: for (int i = 0; i < length; i++) 183: { 184: Comparable o1 = a1[i]; 185: Comparable o2 = a2[i]; 186: if (o1 == null && o2 == null) 187: { 188: // cannot decide .. 189: continue; 190: } 191: if (o1 == null) 192: { 193: return 1; 194: } 195: if (o2 == null) 196: { 197: return -1; 198: } 199: int retval = o1.compareTo(o2); 200: if (retval != 0) 201: { 202: return retval; 203: } 204: } 205: return 0; 206: } 207: 208: }