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jfreechart example source code file (ChartChangeEventType.java)

This example jfreechart source code file (ChartChangeEventType.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

chartchangeeventtype, chartchangeeventtype, dataset_updated, general, general, io, new_dataset, object, object, objectstreamexception, serializable, string, string

The jfreechart ChartChangeEventType.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -------------------------
 * ChartChangeEventType.java
 * -------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 18-Feb-2005 : Version 1 (DG);
 *
 */

package org.jfree.chart.event;

import java.io.ObjectStreamException;
import java.io.Serializable;

/**
 * Defines tokens used to indicate an event type.
 */
public final class ChartChangeEventType implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 5481917022435735602L;

    /** GENERAL. */
    public static final ChartChangeEventType GENERAL
            = new ChartChangeEventType("ChartChangeEventType.GENERAL");

    /** NEW_DATASET. */
    public static final ChartChangeEventType NEW_DATASET
            = new ChartChangeEventType("ChartChangeEventType.NEW_DATASET");

    /** DATASET_UPDATED. */
    public static final ChartChangeEventType DATASET_UPDATED
            = new ChartChangeEventType("ChartChangeEventType.DATASET_UPDATED");

    /** The name. */
    private String name;

    /**
     * Private constructor.
     *
     * @param name  the name.
     */
    private ChartChangeEventType(String name) {
        this.name = name;
    }

    /**
     * Returns a string representing the object.
     *
     * @return The string.
     */
    public String toString() {
        return this.name;
    }

    /**
     * Returns <code>true if this object is equal to the specified
     * object, and <code>false otherwise.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof ChartChangeEventType)) {
            return false;
        }
        ChartChangeEventType that = (ChartChangeEventType) obj;
        if (!this.name.equals(that.toString())) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        return this.name.hashCode();
    }

    /**
     * Ensures that serialization returns the unique instances.
     *
     * @return The object.
     *
     * @throws ObjectStreamException if there is a problem.
     */
    private Object readResolve() throws ObjectStreamException {
        if (this.equals(ChartChangeEventType.GENERAL)) {
            return ChartChangeEventType.GENERAL;
        }
        else if (this.equals(ChartChangeEventType.NEW_DATASET)) {
            return ChartChangeEventType.NEW_DATASET;
        }
        else if (this.equals(ChartChangeEventType.DATASET_UPDATED)) {
            return ChartChangeEventType.DATASET_UPDATED;
        }
        return null;
    }

}

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