001/* ======================================================
002 * Orson : a free chart beans library based on JFreeChart
003 * ======================================================
004 *
005 * (C) Copyright 2007, by Object Refinery Limited.
006 *
007 * Project Info:  http://www.jfree.org/orson/
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
029package org.jfree.beans;
030
031import java.io.ObjectStreamException;
032import java.io.Serializable;
033
034/**
035 * A token representing the axis scale type.
036 */
037public final class AxisScale implements Serializable {
038    
039    /** Integer. */
040    public static final AxisScale INTEGER = new AxisScale("AxisScale.INTEGER");
041
042    /** Floating point. */
043    public static final AxisScale FLOAT = new AxisScale("AxisScale.FLOAT");
044
045    /** The name. */
046    private String name;
047
048    /**
049     * Private constructor.
050     *
051     * @param name  the name.
052     */
053    private AxisScale(String name) {
054        this.name = name;
055    }
056
057    /**
058     * Returns a string representing the object.
059     *
060     * @return the string (never <code>null</code>).
061     */
062    public String toString() {
063        return this.name;
064    }
065
066
067    /**
068     * Compares this object for equality with an other object.
069     * Implementation note: This simply compares the factor instead
070     * of the name.
071     *
072     * @param obj  the other object
073     * 
074     * @return true or false
075     */
076    public boolean equals(Object obj) {
077        if (this == obj) {
078            return true;
079        }
080        if (!(obj instanceof AxisScale)) {
081            return false;
082        }
083        AxisScale that = (AxisScale) obj;
084        return this.name.equals(that.name);
085    }
086
087    /**
088     * Returns a hash code value for the object.
089     *
090     * @return the hashcode
091     */
092    public int hashCode() {
093        return this.name.hashCode();
094    }
095
096    /**
097     * Ensures that serialization returns the unique instances.
098     * 
099     * @return the object.
100     * 
101     * @throws ObjectStreamException if there is a problem.
102     */
103    private Object readResolve() throws ObjectStreamException {
104        if (this.equals(AxisScale.INTEGER)) {
105            return AxisScale.INTEGER;
106        }
107        else if (this.equals(AxisScale.FLOAT)) {
108            return AxisScale.FLOAT;
109        }           
110        return null;
111    }
112
113}