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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.myfaces.custom.redirectTracker;
20  
21  import javax.faces.el.VariableResolver;
22  import javax.faces.el.EvaluationException;
23  import javax.faces.context.FacesContext;
24  
25  /**
26   * try to capture all beans put into the request scope
27   */
28  public class RedirectTrackerVariableResolver extends VariableResolver
29  {
30      private final VariableResolver original;
31  
32      public RedirectTrackerVariableResolver(VariableResolver original)
33      {
34          this.original = original;
35      }
36  
37      public Object resolveVariable(FacesContext facesContext, String variable) throws EvaluationException
38      {
39          boolean exists = facesContext.getExternalContext().getRequestMap().containsKey(variable);
40  
41          Object value = original.resolveVariable(facesContext, variable);
42  
43          if (!exists && facesContext.getExternalContext().getRequestMap().containsKey(variable))
44          {
45              // variable created and put into the request scope
46  
47              RedirectTrackerManager manager = RedirectTrackerManager.getInstance(FacesContext.getCurrentInstance());
48              if (manager != null)
49              {
50                  manager.addSaveStateBean(variable, value);
51              }
52          }
53  
54          return value;
55      }
56  }