1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 package proguard.util; 23 24 /** 25 * This class contains utility methods operating on objects. 26 */ 27 public class ObjectUtil 28 { 29 /** 30 * Returns whether the given objects are the same. 31 * @param object1 the first object, may be null. 32 * @param object2 the second object, may be null. 33 * @return whether the objects are the same. 34 */ equal(Object object1, Object object2)35 public static boolean equal(Object object1, Object object2) 36 { 37 return object1 == null ? 38 object2 == null : 39 object1.equals(object2); 40 } 41 42 43 /** 44 * Returns the hash code of the given object, or 0 if it is null. 45 * @param object the object, may be null. 46 * @return the hash code. 47 */ hashCode(Object object)48 public static int hashCode(Object object) 49 { 50 return object == null ? 0 : object.hashCode(); 51 } 52 53 54 /** 55 * Returns a comparison of the two given objects. 56 * @param object1 the first object, may be null. 57 * @param object2 the second object, may be null. 58 * @return -1, 0, or 1. 59 * @see Comparable#compareTo(Object) 60 */ compare(Comparable object1, Comparable object2)61 public static int compare(Comparable object1, Comparable object2) 62 { 63 return object1 == null ? 64 object2 == null ? 0 : -1 : 65 object2 == null ? 1 : object1.compareTo(object2); 66 } 67 } 68