UserAttributeBinding


1   // Copyright 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.portlet.bindings;
16  
17  import java.util.Map  ;
18  
19  import javax.portlet.PortletRequest;
20  
21  import org.apache.hivemind.ApplicationRuntimeException;
22  import org.apache.hivemind.Location;
23  import org.apache.hivemind.util.Defense;
24  import org.apache.tapestry.binding.AbstractBinding;
25  import org.apache.tapestry.coerce.ValueConverter;
26  
27  /**
28   * Allows access to a Portlet user attrbute.
29   * 
30   * @author Howard M. Lewis Ship
31   * @since 4.0
32   */
33  public class UserAttributeBinding extends AbstractBinding
34  {
35      private PortletRequest _request;
36  
37      private String   _attributeName;
38  
39      public UserAttributeBinding(String   description, ValueConverter valueConverter,
40              Location location, PortletRequest request, String   attributeName)
41      {
42          super(description, valueConverter, location);
43  
44          Defense.notNull(request, "request");
45          Defense.notNull(attributeName, "attributeName");
46  
47          _request = request;
48          _attributeName = attributeName;
49      }
50  
51      public boolean isInvariant()
52      {
53          // These can always be changed.
54          return false;
55      }
56  
57      private Map   getUserInfo()
58      {
59          Map   result = (Map  ) _request.getAttribute(PortletRequest.USER_INFO);
60  
61          if (result == null)
62              throw new ApplicationRuntimeException(BindingsMessages.noUserInfo(), getLocation(),
63                      null);
64  
65          return result;
66      }
67  
68      public Object   getObject()
69      {
70          return getUserInfo().get(_attributeName);
71      }
72  
73      public void setObject(Object   value)
74      {
75          String   asString = (String  ) getValueConverter().coerceValue(value, String  .class);
76  
77          getUserInfo().put(_attributeName, asString);
78      }
79  }
80
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