    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jfreechart/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * -------------------------
    028     * LegendRenderingOrder.java
    029     * -------------------------
    030     * (C) Copyright 2004-2007, by Object Refinery Limited and Contributors.
    031     *
    032     * Original Author:  Angel;
    033     * Contributor(s):   -;
    034     *
    035     * Changes
    036     * -------
    037     * 26-Mar-2004 : Version 1 (DG);
    038     *
    039     */
    040
    041    package org.jfree.chart;
    042
    043    import java.io.ObjectStreamException;
    044    import java.io.Serializable;
    045
    046    /**
    047     * Represents the order for rendering legend items.
    048     */
    049    public final class LegendRenderingOrder implements Serializable {
    050
    051        /** For serialization. */
    052        private static final long serialVersionUID = -3832486612685808616L;
    053
    054        /** In order. */
    055        public static final LegendRenderingOrder STANDARD
    056            = new LegendRenderingOrder("LegendRenderingOrder.STANDARD");
    057
    058        /** In reverse order. */
    059        public static final LegendRenderingOrder REVERSE
    060            = new LegendRenderingOrder("LegendRenderingOrder.REVERSE");
    061
    062        /** The name. */
    063        private String name;
    064
    065        /**
    066         * Private constructor.
    067         *
    068         * @param name  the name.
    069         */
    070        private LegendRenderingOrder(String name) {
    071            this.name = name;
    072        }
    073
    074        /**
    075         * Returns a string representing the object.
    076         *
    077         * @return The string.
    078         */
    079        public String toString() {
    080            return this.name;
    081        }
    082
    083        /**
    084         * Returns <code>true</code> if this object is equal to the specified
    085         * object, and <code>false</code> otherwise.
    086         *
    087         * @param obj  the other object.
    088         *
    089         * @return A boolean.
    090         */
    091        public boolean equals(Object obj) {
    092            if (this == obj) {
    093                return true;
    094            }
    095            if (!(obj instanceof LegendRenderingOrder)) {
    096                return false;
    097            }
    098            LegendRenderingOrder order = (LegendRenderingOrder) obj;
    099            if (!this.name.equals(order.toString())) {
    100                return false;
    101            }
    102            return true;
    103        }
    104
    105        /**
    106         * Ensures that serialization returns the unique instances.
    107         *
    108         * @return The object.
    109         *
    110         * @throws ObjectStreamException if there is a problem.
    111         */
    112        private Object readResolve() throws ObjectStreamException {
    113            if (this.equals(LegendRenderingOrder.STANDARD)) {
    114                return LegendRenderingOrder.STANDARD;
    115            }
    116            else if (this.equals(LegendRenderingOrder.REVERSE)) {
    117                return LegendRenderingOrder.REVERSE;
    118            }
    119            return null;
    120        }
    121
    122    }