1b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang/* 2b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * ProGuard -- shrinking, optimization, obfuscation, and preverification 3b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * of Java bytecode. 4b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * 5b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu) 6b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * 7b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * This program is free software; you can redistribute it and/or modify it 8b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * under the terms of the GNU General Public License as published by the Free 9b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Software Foundation; either version 2 of the License, or (at your option) 10b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * any later version. 11b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * 12b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * This program is distributed in the hope that it will be useful, but WITHOUT 13b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * more details. 16b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * 17b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * You should have received a copy of the GNU General Public License along 18b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * with this program; if not, write to the Free Software Foundation, Inc., 19b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang */ 21b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 22b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wangpackage proguard.util; 23b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 24b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang/** 25b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * This class contains utility methods operating on objects. 26b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang */ 27b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wangpublic class ObjectUtil 28b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang{ 29b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang /** 30b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Returns whether the given objects are the same. 31b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param object1 the first object, may be null. 32b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param object2 the second object, may be null. 33b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @return whether the objects are the same. 34b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang */ 35b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang public static boolean equal(Object object1, Object object2) 36b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 37b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang return object1 == null ? 38b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang object2 == null : 39b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang object1.equals(object2); 40b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 41b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 42b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 43b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang /** 44b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Returns the hash code of the given object, or 0 if it is null. 45b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param object the object, may be null. 46b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @return the hash code. 47b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang */ 48b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang public static int hashCode(Object object) 49b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 50b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang return object == null ? 0 : object.hashCode(); 51b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 52b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 53b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang 54b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang /** 55b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * Returns a comparison of the two given objects. 56b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param object1 the first object, may be null. 57b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @param object2 the second object, may be null. 58b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @return -1, 0, or 1. 59b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang * @see Comparable#compareTo(Object) 60b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang */ 61b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang public static int compare(Comparable object1, Comparable object2) 62b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang { 63b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang return object1 == null ? 64b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang object2 == null ? 0 : -1 : 65b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang object2 == null ? 1 : object1.compareTo(object2); 66b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang } 67b9cc48a43ed984587c939d02fba5316bf5c0df6eYing Wang} 68