001/* =================================================== 002 * JFreeSVG : an SVG library for the Java(tm) platform 003 * =================================================== 004 * 005 * (C)opyright 2013-2021, by Object Refinery Limited. All rights reserved. 006 * 007 * Project Info: http://www.jfree.org/jfreesvg/index.html 008 * 009 * This program is free software: you can redistribute it and/or modify 010 * it under the terms of the GNU General Public License as published by 011 * the Free Software Foundation, either version 3 of the License, or 012 * (at your option) any later version. 013 * 014 * This program is distributed in the hope that it will be useful, 015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 017 * GNU General Public License for more details. 018 * 019 * You should have received a copy of the GNU General Public License 020 * along with this program. If not, see <http://www.gnu.org/licenses/>. 021 * 022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 023 * Other names may be trademarks of their respective owners.] 024 * 025 * If you do not wish to be bound by the terms of the GPL, an alternative 026 * commercial license can be purchased. For details, please see visit the 027 * JFreeSVG home page: 028 * 029 * http://www.jfree.org/jfreesvg 030 * 031 */ 032 033package org.jfree.graphics2d; 034 035/** 036 * Provides a couple of static utility methods used throughout 037 * <b>JFreeSVG</b>. 038 */ 039public final class ObjectUtils { 040 041 private ObjectUtils() { 042 // no need to instantiate 043 } 044 045 /** 046 * Returns {@code true} if the objects are equal or both 047 * {@code null}, and {@code false} otherwise. 048 * <br><br> 049 * In Java 7, we could use methods in the {@code Objects} class 050 * instead, but for now JFreeSVG is supporting Java 6 and above. 051 * 052 * @param obj1 object 1 ({@code null} permitted). 053 * @param obj2 object 2 ({@code null} permitted). 054 * 055 * @return A boolean. 056 */ 057 public static boolean equals(Object obj1, Object obj2) { 058 if (obj1 == null) { 059 return obj2 == null; 060 } else { 061 return obj1.equals(obj2); 062 } 063 } 064 065 /** 066 * Returns the hash code for the object, or {@code 0} if the object is 067 * {@code null}. 068 * <br><br> 069 * In Java 7, we could use methods in the {@code Objects} class 070 * instead, but for now JFreeSVG is supporting Java 6 and above. 071 * 072 * @param obj the object ({@code null} permitted). 073 * 074 * @return The hash code or 0. 075 */ 076 public static int hashCode(Object obj) { 077 if (obj == null) { 078 return 0; 079 } 080 return obj.hashCode(); 081 } 082}