DefaultParameterResolver


1   /* ***** BEGIN LICENSE BLOCK *****
2    * Version: MPL 1.1
3    * The contents of this file are subject to the Mozilla Public License Version
4    * 1.1 (the "License"); you may not use this file except in compliance with
5    * the License. You may obtain a copy of the License at
6    * http://www.mozilla.org/MPL/
7    * 
8    * Software distributed under the License is distributed on an "AS IS" basis,
9    * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10   * for the specific language governing rights and limitations under the
11   * License.
12   * 
13   * The Original Code is Riot.
14   * 
15   * The Initial Developer of the Original Code is
16   * Neteye GmbH.
17   * Portions created by the Initial Developer are Copyright (C) 2006
18   * the Initial Developer. All Rights Reserved.
19   * 
20   * Contributor(s):
21   *   Felix Gnass [fgnass at neteye dot de]
22   * 
23   * ***** END LICENSE BLOCK ***** */
24  package org.riotfamily.website.generic.model.hibernate;
25  
26  import javax.servlet.http.HttpServletRequest  ;
27  
28  /**
29   * ParameterResolver that first looks for a request attribute with the name 
30   * returned by <code>getAttribute()</code>. If no attribute is found, it looks 
31   * for a request parameter with the name returned by <code>getName()</code>.
32   * If the parameter is an empty String, <code>null</code> is returned.
33   */
34  public class DefaultParameterResolver extends AbstractParameterResolver {
35  
36      private String   attribute;
37      
38      public void setAttribute(String   attribute) {
39          this.attribute = attribute;
40      }
41      
42      public String   getAttribute() {
43          return attribute != null ? attribute : getName();
44      }
45  
46      public Object   getValueInternal(HttpServletRequest   request) {
47          Object   value = request.getAttribute(getAttribute());
48          if (value != null) {
49              return value;
50          }
51          String   s = (String  ) request.getParameter(getName());
52          return (s == null || s.length() == 0) ? null : s;
53      }
54      
55  }
56
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