/*
    * @(#)$Id: DataBinding.java 742 2009-08-15 17:15:49Z kurmannu $
    *
    * Author   : Ueli Kurmann, igesture@uelikurmann.ch
    *                                   
    *                                   
    * Purpose  : 
    *
    * -----------------------------------------------------------------------
   *
   * Revision Information:
   *
   * Date       Who     Reason
   *
   * 23.03.2008 ukurmann  Initial Release
   *
   * -----------------------------------------------------------------------
   *
   * Copyright 1999-2009 ETH Zurich. All Rights Reserved.
   *
   * This software is the proprietary information of ETH Zurich.
   * Use is subject to license terms.
   * 
   */
  
  package org.ximtec.igesture.tool.binding;
  
  import java.awt.event.FocusEvent;
  import java.awt.event.FocusListener;
  import java.beans.PropertyChangeEvent;
  import java.beans.PropertyChangeListener;
  import java.beans.PropertyVetoException;
  import java.lang.reflect.InvocationTargetException;
  
  import javax.swing.JComponent;
  import javax.swing.SwingUtilities;
  
  import org.apache.commons.beanutils.BeanUtils;
  import org.ximtec.igesture.core.DataObject;
  
  public abstract class DataBinding<T extends JComponent> implements FocusListener, PropertyChangeListener {
  
    private DataObject dataObject;
    private String property;
  
    /**
     * Constructor
     * 
     * @param dataObject
     *          the data object
     * @param property
     *          the name of the property
     * @param key
     *          the key used by the localization handler (can be null)
     */
    public DataBinding(DataObject dataObject, String property) {
      this.dataObject = dataObject;
      this.dataObject.addPropertyChangeListener(this);
      this.property = property;
    }
  
    /**
     * This method provides functionality to update the view in case of model
     * changes. This method is invoked on a propertyChange event.
     */
    protected abstract void updateView();
  
    /**
     * This method provides functionality to update the model.
     */
    protected abstract void updateModel();
  
    /**
     * Returns the JComponent which is involved in the binding process.
     * 
     * @return
     */
    public abstract T getComponent();
  
    /**
     * Set a value in the dataobject
     * 
     * @param object
     * @throws PropertyVetoException
     */
    protected void setValue(Object object) {
      try {
        BeanUtils.setProperty(dataObject, property, object);
      } catch (SecurityException e) {
      } catch (IllegalAccessException e) {
      } catch (InvocationTargetException e) {
  
      }
    }
  
    /**
     * Read a value from the data object
     * 
     * @return
    */
   protected String getValue() {
     try {
       return BeanUtils.getProperty(dataObject, property);
     } catch (IllegalAccessException e) {
     } catch (InvocationTargetException e) {
     } catch (NoSuchMethodException e) {
     }
     return null;
   }
 
   /**
    * Returns the data object
    * 
    * @return
    */
   public Object getObject() {
     return dataObject;
   }
 
   /**
    * Returns the property name
    * 
    * @return
    */
   public String getProperty() {
     return property;
   }
 
   @Override
   public void focusGained(FocusEvent arg0) {
     // do nothing
   }
 
   @Override
   public void focusLost(FocusEvent arg0) {
     updateModel();
   }
 
   @Override
   public final void propertyChange(PropertyChangeEvent evt) {
     if (SwingUtilities.isEventDispatchThread()) {
       updateView();
     } else {
       SwingUtilities.invokeLater(new Runnable() {
 
         @Override
         public void run() {
           updateView();
         }
       });
     }
   }
 }