/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2014, 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.]
*
* ---------------------
* LabelChangeEvent.java
* ---------------------
* (C) Copyright 2013, 2014, by Michael Zinsmaier and Contributors.
*
* Original Author: Michael Zinsmaier;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes
* -------
* 17-Sep-2013 : Version 1 (MZ);
*
*/
package org.jfree.data.general;
import java.util.EventObject;
import org.jfree.data.extension.DatasetCursor;
import org.jfree.data.extension.DatasetLabelExtension;
import org.jfree.data.extension.DatasetSelectionExtension;
/**
* A change event that notifies about a change to the labeling of data items
*
* @author zinsmaie
*/
public class LabelChangeEvent<CURSOR extends DatasetCursor>
extends EventObject {
/** a generated serial id */
private static final long serialVersionUID = 2289987249349231381L;
/**
* Constructs a new event.
*
* @param source the source of the event aka the label extension that
* changed (the object has to be of type DatasetLabelExtension and
* must not be null!)
*/
public LabelChangeEvent(Object source) {
super(source);
}
/**
* @return the label selection extension that triggered the event.
*/
public DatasetSelectionExtension<CURSOR> getLabelExtension() {
if (getSource() instanceof DatasetLabelExtension) {
return (DatasetSelectionExtension<CURSOR>) this.getSource();
}
//implementation error
return null;
}
}