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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * -----------------------
 * 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
     * 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 (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 null since adding a null dataset to a
     * plot will generated a change event.
     *
     * @return The dataset (possibly null).
     */
    public Dataset getDataset() {
        return this.dataset;
    }

}