PageFlowActionListener


1   /*
2    * Copyright 2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   *
16   * $Header:$
17   */
18  package org.apache.beehive.netui.pageflow.faces.internal;
19  
20  import org.apache.beehive.netui.pageflow.internal.InternalUtils;
21  import org.apache.struts.action.ActionForm;
22  
23  import javax.faces.event.ActionListener;
24  import javax.faces.event.ActionEvent;
25  import javax.faces.event.AbortProcessingException;
26  import javax.faces.context.FacesContext;
27  import javax.faces.el.ValueBinding;
28  import javax.servlet.ServletRequest  ;
29  
30  /**
31   * Internal class used in JSF/Page Flow integration.  This exists to pass form beans from JSF pages to Page Flow
32   * actions, and to abort event processing if {@link PageFlowNavigationHandler} forwarded to an action.
33   * 
34   * @see org.apache.beehive.netui.pageflow.faces.PageFlowApplicationFactory
35   */ 
36  public class PageFlowActionListener
37          implements ActionListener
38  {
39      private ActionListener _delegate;
40      
41      public PageFlowActionListener( ActionListener delegate )
42      {
43          _delegate = delegate;
44      }
45      
46      public void processAction( ActionEvent event ) throws AbortProcessingException
47      {
48          Object   submitFormBean = event.getComponent().getAttributes().get( "submitFormBean" );
49          FacesContext context = FacesContext.getCurrentInstance();
50          
51          if ( submitFormBean != null )
52          {
53              ValueBinding binding = context.getApplication().createValueBinding( "#{" + submitFormBean + '}' );
54              Object   beanInstance = binding.getValue( context );
55              Object   request = context.getExternalContext().getRequest();
56              assert request instanceof ServletRequest   : request.getClass().getName();
57              ActionForm wrappedFormBean = InternalUtils.wrapFormBean( beanInstance );
58              InternalUtils.setForwardedFormBean( ( ServletRequest   ) request, wrappedFormBean );
59          }
60          
61          _delegate.processAction( event );
62          
63          Object   request = context.getExternalContext().getRequest();
64          assert request instanceof ServletRequest   : request.getClass().getName();
65          ServletRequest   servletRequest = ( ServletRequest   ) request;
66          
67          String   actionURI = ( String   ) servletRequest.getAttribute( PageFlowNavigationHandler.ALREADY_FORWARDED_ATTR );
68          
69          if ( actionURI != null )
70          {
71              throw new AbortProcessingException( "PageFlowNavigationHandler forwarded to: " + actionURI );
72          }
73      }
74  }
75
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