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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.configuration.web;
19  
20  import java.util.Iterator;
21  import java.util.List;
22  import javax.servlet.Servlet;
23  import javax.servlet.ServletContext;
24  
25  import org.apache.commons.collections.iterators.EnumerationIterator;
26  import org.apache.commons.configuration.PropertyConverter;
27  
28  /***
29   * A configuration wrapper to read the initialization parameters of a servlet
30   * context. This configuration is read only, adding or removing a property will
31   * throw an UnsupportedOperationException.
32   *
33   * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
34   * @version $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02 Sep 2006) $
35   * @since 1.1
36   */
37  public class ServletContextConfiguration extends BaseWebConfiguration
38  {
39      /*** Stores the wrapped servlet context.*/
40      protected ServletContext context;
41  
42      /***
43       * Create a ServletContextConfiguration using the context of
44       * the specified servlet.
45       *
46       * @param servlet the servlet
47       */
48      public ServletContextConfiguration(Servlet servlet)
49      {
50          this.context = servlet.getServletConfig().getServletContext();
51      }
52  
53      /***
54       * Create a ServletContextConfiguration using the servlet context
55       * initialization parameters.
56       *
57       * @param context the servlet context
58       */
59      public ServletContextConfiguration(ServletContext context)
60      {
61          this.context = context;
62      }
63  
64      public Object getProperty(String key)
65      {
66          Object value = context.getInitParameter(key);
67          if (!isDelimiterParsingDisabled())
68          {
69              List list = PropertyConverter.split((String) value, getListDelimiter());
70              value = list.size() > 1 ? list : value;
71          }
72  
73          return value;
74      }
75  
76      public Iterator getKeys()
77      {
78          return new EnumerationIterator(context.getInitParameterNames());
79      }
80  }