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/***********************************************************************************************************************
 *
 * OpenBlueSky - NetBeans Platform Enhancements
 * Copyright (C) 2006-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * 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.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://openbluesky.kenai.com
 * SCM: https://kenai.com/hg/openbluesky~src
 *
 **********************************************************************************************************************/
package it.tidalwave.netbeans.dialog;

import java.awt.Component;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.openide.WizardDescriptor;
import org.openide.util.HelpCtx;

/*******************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 ******************************************************************************/
public class GenericWizardPanel implements WizardDescriptor.Panel
  {    
    /**
     * The visual component that displays this panel. If you need to access the
     * component from this class, just use getComponent().
     */
    protected Component component;
    
    private Class componentClass;
    
    private final Set listeners = new HashSet(1);
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public GenericWizardPanel (Class componentClass)
      {
        this.componentClass = componentClass;  
      }
     
    // Get the visual component for the panel. In this template, the component
    // is kept separate. This can be more efficient: if the wizard is created
    // but never displayed, or not all panels are displayed, it is better to
    // create only those which really need to be visible.
    /***************************************************************************
     *
     *
     **************************************************************************/
    public Component getComponent()
      {
        if (component == null)
          {
            try
              {
                component = (Component)componentClass.newInstance();
                component.addPropertyChangeListener(new PropertyChangeListener()
                  {
                    public void propertyChange (PropertyChangeEvent event)
                      {
                        fireChangeEvent();
                      }
                  });
              }
            catch (IllegalAccessException ex)
              {
                ex.printStackTrace();
              } 
            catch (InstantiationException ex)
              {
                ex.printStackTrace();
              }
          }
        
        return component;
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public HelpCtx getHelp()
      {
        return new HelpCtx(componentClass);
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public boolean isValid()
      {
        return true;
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public final void addChangeListener (ChangeListener l)
      {
        synchronized (listeners)
          {
            listeners.add(l);
          }
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public final void removeChangeListener (ChangeListener l)
      {
        synchronized (listeners)
          {
            listeners.remove(l);
          }
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    protected final void fireChangeEvent()
      {
        Iterator it;
        
        synchronized (listeners)
          {
            it = new HashSet(listeners).iterator();
          }
        
        ChangeEvent ev = new ChangeEvent(this);
        
        while (it.hasNext())
          {
            it.next().stateChanged(ev);
          }
      }
    
    // You can use a settings object to keep track of state. Normally the
    // settings object will be the WizardDescriptor, so you can use
    // WizardDescriptor.getProperty & putProperty to store information entered
    // by the user.
    /***************************************************************************
     *
     *
     **************************************************************************/
    public void readSettings (Object settings)
      {
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public void storeSettings (Object settings)
      {
      }    
  }