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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
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  package org.apache.cayenne.swing;
  
  import java.awt.Component;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.beans.BeanInfo;
  import java.beans.EventSetDescriptor;
  import java.beans.Introspector;
  
  import org.apache.cayenne.CayenneRuntimeException;
  
  /**
   * A binding that registers for action events of an arbitrary Component JavaBean that
   * provides a way to add an ActionListener via BeanDescriptor.
   * 
   */
  public class BeanActionBinding extends BindingBase {
  
      protected Component view;
  
      public BeanActionBinding(Component component, String actionExpression) {
          super(actionExpression);
          this.view = component;
  
          boolean foundActionEvents = false;
  
          try {
              BeanInfo info = Introspector.getBeanInfo(component.getClass());
              EventSetDescriptor[] events = info.getEventSetDescriptors();
  
              if (events != null && events.length > 0) {
                  for (EventSetDescriptor event : events) {
                      if (ActionListener.class
                              .isAssignableFrom(event.getListenerType())) {
  
                          event.getAddListenerMethod().invoke(component, new ActionListener() {
                                      public void actionPerformed(ActionEvent e) {
                                          fireAction();
                                      }
                                  });
  
                          foundActionEvents = true;
                          break;
                      }
                  }
              }
  
          }
          catch (Exception e) {
              throw new CayenneRuntimeException("Error binding to component", e);
          }
  
          if (!foundActionEvents) {
              throw new CayenneRuntimeException("Component does not define action events: %s", component);
          }
      }
  
      public Component getView() {
          if (view == null) {
              throw new BindingException("headless action");
          }
  
          return view;
      }
  
      public void updateView() {
          // noop
      }
  
      protected void fireAction() {
          // TODO: catch exceptions...
          getValue();
      }
  }
  