/* ===========================================================
 
* JFreeChart : a free chart library for the Java(tm) platform
 
* ===========================================================
 
*
 
* (C) Copyright 2000-2016, 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.]
 
*
 
* -----------------
 
* PieChartTest.java
 
* -----------------
 
* (C) Copyright 2002-2016, by Object Refinery Limited.
 
*
 
* Original Author:
  
David Gilbert (for Object Refinery Limited);
 
* Contributor(s):
   
-;
 
*
 
* Changes:
 
* --------
 
* 11-Jun-2002 : Version 1 (DG);
 
* 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 
*
 
*/

package org.jfree.chart;

import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

/**
 
* Tests for a pie chart.
 
*
 
*/
public class PieChartTest
  
{

    
/** A chart. */
    
private JFreeChart pieChart;

    
/**
     
* Common test setup.
     
*/
    
@Before
    
public void setUp() {
        
this.pieChart = createPieChart();
    
}

    
/**
     
* Using a regular pie chart, we replace the dataset with null.
  
Expect to
     
* receive notification of a chart change event, and (of course) the
     
* dataset should be null.
     
*/

    
@Test
    
public void testReplaceDatasetOnPieChart() {
        
LocalListener l = new LocalListener();
        
this.pieChart.addChangeListener(l);
        
PiePlot plot = (PiePlot) this.pieChart.getPlot();
        
plot.setDataset(null);
        
assertEquals(true, l.flag);
        
assertNull(plot.getDataset());
    
}

    
/**
     
* Creates a pie chart.
     
*
     
* @return The pie chart.
     
*/
    
private static JFreeChart createPieChart() {
        
DefaultPieDataset data = new DefaultPieDataset();
        
data.setValue("Java", new Double(43.2));
        
data.setValue("Visual Basic", new Double(0.0));
        
data.setValue("C/C++", new Double(17.5));
        
return ChartFactory.createPieChart("Pie Chart", data);
    
}

    
/**
     
* A chart change listener.
     
*
     
*/
    
static class LocalListener implements ChartChangeListener {

        
/** A flag. */
        
private boolean flag;

        
/**
         
* Event handler.
         
*
         
* @param event
  
the event.
         
*/

        
@Override
        
public void chartChanged(ChartChangeEvent event) {
            
this.flag = true;
        
}

    
}

}