    001/* ===================================================
    002 * JFreeSVG : an SVG library for the Java(tm) platform
    003 * ===================================================
    004 *
    005 * (C)opyright 2013, 2014, 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</code> if the objects are equal or both
    047     * <code>null</code>, and <code>false</code> otherwise.
    048     * <br><br>
    049     * In Java 7, we could use methods in the <code>Objects</code> class
    050     * instead, but for now JFreeSVG is supporting Java 6 and above.
    051     *
    052     * @param obj1  object 1 (<code>null</code> permitted).
    053     * @param obj2  object 2 (<code>null</code> 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</code> if the object is
    067     * <code>null</code>.
    068     * <br><br>
    069     * In Java 7, we could use methods in the <code>Objects</code> class
    070     * instead, but for now JFreeSVG is supporting Java 6 and above.
    071     *
    072     * @param obj  the object (<code>null</code> 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}