// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.workbench.chart;
import java.awt.Color;
import java.awt.Paint;
import java.util.ArrayList;
import java.util.List;
import org.apache.hivemind.HiveMind;
import org.apache.tapestry.IAsset;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.event.PageBeginRenderListener;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.html.BasePage;
import org.apache.tapestry.valid.IValidationDelegate;
import org.jCharts.Chart;
import org.jCharts.chartData.ChartDataException;
import org.jCharts.chartData.PieChartDataSet;
import org.jCharts.nonAxisChart.PieChart2D;
import org.jCharts.properties.ChartProperties;
import org.jCharts.properties.LegendProperties;
import org.jCharts.properties.PieChart2DProperties;
import org.jCharts.test.TestDataGenerator;
/**
* Demonstrates more complex form handling (including loops and dynamic addition/deletion of rows)
* as well as dynamic image generation using JCharts.
*
* @author Howard Lewis Ship, Luis Neves
* @since 1.0.10
*/
public abstract class ChartPage extends BasePage implements IChartProvider, PageBeginRenderListener
{
/**
* Invokes {@link #getPlotValues()}, which ensures that (on the very first request cycle), the
* persistent values property is set <em>before</em> the page recorder is locked.
*/
public void pageBeginRender(PageEvent event)
{
if (getPlotValues() == null)
{
List plotValues = new ArrayList();
plotValues.add(new PlotValue("Fred", 10));
plotValues.add(new PlotValue("Barney", 15));
plotValues.add(new PlotValue("Dino", 7));
setPlotValues(plotValues);
}
}
public abstract List getPlotValues();
public abstract void setPlotValues(List plotValues);
public abstract PlotValue getPlotValue();
public abstract List getRemoveValues();
public abstract void setRemoveValues(List removeValues);
/**
* Invoked during the render; always returns false.
*/
public boolean isMarkedForDeletion()
{
return false;
}
/**
* Invoked by the deleted checkbox (for each plotValue). If true, the the current plotValue is
* added to the list of plotValues to remove (though the actual removing is done inside
* {@link #delete(IRequestCycle)}, after the loop.
*/
public void setMarkedForDeletion(boolean value)
{
if (value)
{
List removeValues = getRemoveValues();
if (removeValues == null)
{
removeValues = new ArrayList();
setRemoveValues(removeValues);
}
removeValues.add(getPlotValue());
// Deleting things screws up the validation delegate.
// That's because the errors are associated with the form name
// (not the component id), and deleting elements causes
// all the names to shift.
IValidationDelegate delegate = (IValidationDelegate) getBeans().getBean("delegate");
delegate.clear();
}
}
/**
* Listener method for the add button, adds an additional (blank) plot value.
*/
public void add()
{
List plotValues = getPlotValues();
plotValues.add(new PlotValue());
setPlotValues(plotValues);
}
/**
* Listener method for the remove button, removes any checked plot values.
*
* @see #setMarkedForDeletion(boolean)
*/
public void delete()
{
List removeValues = getRemoveValues();
if (removeValues != null)
{
List plotValues = getPlotValues();
plotValues.removeAll(removeValues);
setPlotValues(plotValues);
}
}
private IAsset chartImageAsset;
public IAsset getChartImageAsset()
{
return new ChartAsset(getRequestCycle(), this);
}
/**
* This method is invoked by the service (in a seperate request cycle from all the form handling
* stuff). The {@link #getChartImageAsset()}method provides an {@link IAsset}that is handled
* by the {@link ChartService}, and the asset encodes the identity of this page.
*/
public Chart getChart()
{
LegendProperties legendProperties = new LegendProperties();
legendProperties.setNumColumns(2);
legendProperties.setPlacement(LegendProperties.RIGHT);
ChartProperties chartProperties = new ChartProperties();
chartProperties.setBackgroundPaint(Color.decode("#ffffcc"));
Chart result = new PieChart2D(getData(), legendProperties, chartProperties, 400, 350);
return result;
}
private PieChartDataSet getData()
{
List plotValues = getPlotValues();
int count = plotValues.size();
double[] data = new double[count];
String[] labels = new String[count];
PieChart2DProperties properties = new PieChart2DProperties();
for (int i = 0; i < count; i++)
{
PlotValue pv = (PlotValue) plotValues.get(i);
String name = pv.getName();
if (HiveMind.isBlank(name))
name = "<New>";
data[i] = new Double(pv.getValue()).doubleValue();
labels[i] = new String(name);
}
Paint[] paints = TestDataGenerator.getRandomPaints(count);
try
{
return new PieChartDataSet("Pie Chart", data, labels, paints, properties);
}
catch (ChartDataException e)
{
return null;
}
}
}