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}