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1   /*
2    * Copyright 2004-2005 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  
17  package org.apache.commons.configuration.web;
18  
19  import java.util.Iterator;
20  import java.util.List;
21  import javax.servlet.Servlet;
22  import javax.servlet.ServletConfig;
23  
24  import org.apache.commons.collections.iterators.EnumerationIterator;
25  import org.apache.commons.configuration.PropertyConverter;
26  
27  /***
28   * A configuration wrapper around a {@link ServletConfig}. This configuration
29   * is read only, adding or removing a property will throw an
30   * UnsupportedOperationException.
31   *
32   * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
33   * @version $Revision$, $Date: 2005-10-12 21:01:43 +0200 (Wed, 12 Oct 2005) $
34   * @since 1.1
35   */
36  public class ServletConfiguration extends BaseWebConfiguration
37  {
38      /*** Stores a reference to the wrapped <code>ServletConfig</code>.*/
39      protected ServletConfig config;
40  
41      /***
42       * Create a ServletConfiguration using the initialization parameter of
43       * the specified servlet.
44       *
45       * @param servlet the servlet
46       */
47      public ServletConfiguration(Servlet servlet)
48      {
49          this(servlet.getServletConfig());
50      }
51  
52      /***
53       * Create a ServletConfiguration using the servlet initialization parameters.
54       *
55       * @param config the servlet configuration
56       */
57      public ServletConfiguration(ServletConfig config)
58      {
59          this.config = config;
60      }
61  
62      public Object getProperty(String key)
63      {
64          Object value = config.getInitParameter(key);
65          List list = PropertyConverter.split((String) value, getDelimiter());
66  
67          return list.size() > 1 ? list : value;
68      }
69  
70      public Iterator getKeys()
71      {
72          return new EnumerationIterator(config.getInitParameterNames());
73      }
74  }