/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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
* <code>null</code> (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</code>
* 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</code> since adding a <code>null</code> dataset to a
* plot will generated a change event.
*
* @return The dataset (possibly <code>null</code>).
*/
public Dataset getDataset() {
return this.dataset;
}
}
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