/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2009 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.modules.gui.base.parameters;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigDecimal;
import java.util.Date;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.pentaho.reporting.engine.classic.core.ReportDataFactoryException;
import org.pentaho.reporting.engine.classic.core.modules.gui.commonswing.KeyedComboBoxModel;
import org.pentaho.reporting.engine.classic.core.parameters.ListParameter;
import org.pentaho.reporting.engine.classic.core.parameters.ParameterContext;
/**
* Todo: Document me!
* <p/>
* Date: 15.05.2009
* Time: 17:04:13
*
* @author Thomas Morgner.
*/
public class DropDownParameterComponent extends JComboBox implements ParameterComponent
{
private class ComboBoxUpdateHandler implements ChangeListener
{
private ComboBoxUpdateHandler()
{
}
public void stateChanged(final ChangeEvent e)
{
try
{
initialize();
}
catch (ReportDataFactoryException rdfe)
{
throw new IndexOutOfBoundsException("Failed: " + rdfe.getMessage());
}
}
}
private class SingleValueListParameterHandler implements ActionListener
{
private String key;
public SingleValueListParameterHandler(final String key)
{
this.key = key;
}
public void actionPerformed(final ActionEvent e)
{
if (adjustingToExternalInput)
{
return;
}
final Object theSource = e.getSource();
if (theSource instanceof JComboBox)
{
final JComboBox theComboBox = (JComboBox) theSource;
final KeyedComboBoxModel theModel = (KeyedComboBoxModel) theComboBox.getModel();
updateContext.setParameterValue(key, theModel.getSelectedKey());
}
}
}
private ListParameter listParameter;
private ParameterUpdateContext updateContext;
private ParameterContext parameterContext;
private boolean adjustingToExternalInput;
/**
* Creates a <code>JComboBox</code> with a default data model.
* The default data model is an empty list of objects.
* Use <code>addItem</code> to add items. By default the first item
* in the data model becomes selected.
*
* @see javax.swing.DefaultComboBoxModel
*/
public DropDownParameterComponent(final ListParameter listParameter,
final ParameterUpdateContext updateContext,
final ParameterContext parameterContext)
{
if (listParameter == null)
{
throw new NullPointerException();
}
if (updateContext == null)
{
throw new NullPointerException();
}
if (parameterContext == null)
{
throw new NullPointerException();
}
this.listParameter = listParameter;
this.updateContext = updateContext;
this.parameterContext = parameterContext;
addActionListener(new SingleValueListParameterHandler(listParameter.getName()));
updateContext.addChangeListener(new ComboBoxUpdateHandler());
}
public void initialize() throws ReportDataFactoryException
{
adjustingToExternalInput = true;
try
{
final KeyedComboBoxModel keyedComboBoxModel =
DefaultParameterComponentFactory.createModel(listParameter, parameterContext);
final Object value = updateContext.getParameterValue(listParameter.getName());
setSelectedValue(value, keyedComboBoxModel);
setModel(keyedComboBoxModel);
}
finally
{
adjustingToExternalInput = false;
}
}
private void setSelectedValue(final Object key, final KeyedComboBoxModel model)
{
final int size = model.getSize();
for (int i = 0; i < size; i++)
{
final Object value = model.getKeyAt(i);
if (key == value)
{
model.setSelectedKey(value);
return;
}
if (key != null && key.equals(value))
{
model.setSelectedKey(value);
return;
}
if (key instanceof Number && value instanceof Number)
{
final BigDecimal bdK = new BigDecimal(key.toString());
final BigDecimal bdV = new BigDecimal(value.toString());
if (bdK.compareTo(bdV) == 0)
{
model.setSelectedKey(value);
return;
}
}
if (key instanceof Date && value instanceof Date)
{
final Date d1 = (Date) key;
final Date d2 = (Date) value;
if (d1.getTime() == d2.getTime())
{
model.setSelectedKey(value);
return;
}
}
}
model.setSelectedKey(null);
}
public JComponent getUIComponent()
{
return this;
}
}