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jfreechart example source code file (DatasetChangeEvent.java)

This example jfreechart source code file (DatasetChangeEvent.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

dataset, dataset, datasetchangeevent, datasetchangeevent

The jfreechart DatasetChangeEvent.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.]
 *
 * -----------------------
 * DatasetChangeEvent.java
 * -----------------------
 * (C) Copyright 2000-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes (from 24-Aug-2001)
 * --------------------------
 * 24-Aug-2001 : Added standard source header. Fixed DOS encoding problem (DG);
 * 15-Oct-2001 : Move to new package (com.jrefinery.data.*) (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 11-Jun-2002 : Separated the event source from the dataset to cover the case
 *               where the dataset is changed to null in the Plot class.
 *               Updated Javadocs (DG);
 * 04-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 05-Oct-2004 : Minor Javadoc updates (DG);
 *
 */

package org.jfree.data.general;

/**
 * A change event that encapsulates information about a change to a dataset.
 */
public class DatasetChangeEvent extends java.util.EventObject {

    /**
     * The dataset that generated the change event.
     */
    private Dataset dataset;

    /**
     * Constructs a new event.  The source is either the dataset or the
     * {@link org.jfree.chart.plot.Plot} class.  The dataset can be
     * <code>null (in this case the source will be the
     * {@link org.jfree.chart.plot.Plot} class).
     *
     * @param source  the source of the event.
     * @param dataset  the dataset that generated the event (<code>null
     *                 permitted).
     */
    public DatasetChangeEvent(Object source, Dataset dataset) {
        super(source);
        this.dataset = dataset;
    }

    /**
     * Returns the dataset that generated the event.  Note that the dataset
     * may be <code>null since adding a null dataset to a
     * plot will generated a change event.
     *
     * @return The dataset (possibly <code>null).
     */
    public Dataset getDataset() {
        return this.dataset;
    }

}

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