001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 * PieLabelLinkStyle.java
029 * ----------------------
030 * (C) Copyright 2008, by Object Refinery Limited.
031 *
032 * Original Author:  David Gilbert (for Object Refinery Limited);
033 * Contributor(s):   -;
034 *
035 * Changes:
036 * --------
037 * 31-Mar-2008 : Version 1 (DG);
038 *
039 */
040
041package org.jfree.chart.plot;
042
043import java.io.ObjectStreamException;
044import java.io.Serializable;
045
046/**
047 * Used to indicate the style for the lines linking pie sections to their
048 * corresponding labels.
049 *
050 * @since 1.0.10
051 */
052public final class PieLabelLinkStyle implements Serializable {
053
054    /** STANDARD. */
055    public static final PieLabelLinkStyle STANDARD
056            = new PieLabelLinkStyle("PieLabelLinkStyle.STANDARD");
057
058    /** QUAD_CURVE. */
059    public static final PieLabelLinkStyle QUAD_CURVE
060            = new PieLabelLinkStyle("PieLabelLinkStyle.QUAD_CURVE");
061
062    /** CUBIC_CURVE. */
063    public static final PieLabelLinkStyle CUBIC_CURVE
064            = new PieLabelLinkStyle("PieLabelLinkStyle.CUBIC_CURVE");
065
066    /** The name. */
067    private String name;
068
069    /**
070     * Private constructor.
071     *
072     * @param name  the name.
073     */
074    private PieLabelLinkStyle(String name) {
075        this.name = name;
076    }
077
078    /**
079     * Returns a string representing the object.
080     *
081     * @return The string.
082     */
083    public String toString() {
084        return this.name;
085    }
086
087    /**
088     * Returns <code>true</code> if this object is equal to the specified
089     * object, and <code>false</code> otherwise.
090     *
091     * @param obj  the object (<code>null</code> permitted).
092     *
093     * @return A boolean.
094     */
095    public boolean equals(Object obj) {
096        if (this == obj) {
097            return true;
098        }
099        if (!(obj instanceof PieLabelLinkStyle)) {
100            return false;
101        }
102        PieLabelLinkStyle style = (PieLabelLinkStyle) obj;
103        if (!this.name.equals(style.toString())) {
104            return false;
105        }
106        return true;
107    }
108
109    /**
110     * Returns a hash code for this instance.
111     *
112     * @return A hash code.
113     */
114    public int hashCode() {
115        return this.name.hashCode();
116    }
117
118    /**
119     * Ensures that serialization returns the unique instances.
120     *
121     * @return The object.
122     *
123     * @throws ObjectStreamException if there is a problem.
124     */
125    private Object readResolve() throws ObjectStreamException {
126        Object result = null;
127        if (this.equals(PieLabelLinkStyle.STANDARD)) {
128            result = PieLabelLinkStyle.STANDARD;
129        }
130        else if (this.equals(PieLabelLinkStyle.QUAD_CURVE)) {
131            result = PieLabelLinkStyle.QUAD_CURVE;
132        }
133        else if (this.equals(PieLabelLinkStyle.CUBIC_CURVE)) {
134            result = PieLabelLinkStyle.CUBIC_CURVE;
135        }
136        return result;
137    }
138
139}