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1   /*
2    * Copyright 1999-2004 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  package org.apache.commons.jxpath.servlet;
17  
18  import java.util.Enumeration;
19  import java.util.HashSet;
20  
21  import javax.servlet.ServletContext;
22  
23  import org.apache.commons.jxpath.DynamicPropertyHandler;
24  
25  /***
26   * Implementation of the DynamicPropertyHandler interface that provides
27   * access to attributes of a ServletContext.
28   *
29   * @author Dmitri Plotnikov
30   * @version $Revision: 1.6 $ $Date: 2004/05/08 15:10:49 $
31   */
32  public class ServletContextHandler implements DynamicPropertyHandler {
33      
34      private static final String[] STRING_ARRAY = new String[0];
35  
36      public String[] getPropertyNames(Object context) {
37          HashSet list = new HashSet(16);
38          collectPropertyNames(list, context);
39          return (String[]) list.toArray(STRING_ARRAY);
40      }
41      
42      protected void collectPropertyNames(HashSet set, Object bean) {
43          Enumeration e = ((ServletContext) bean).getAttributeNames();
44          while (e.hasMoreElements()) {
45              set.add(e.nextElement());
46          }
47      }
48  
49      public Object getProperty(Object context, String property) {
50          return ((ServletContext) context).getAttribute(property);
51      }
52  
53      public void setProperty(Object context, String property, Object value) {
54          ((ServletContext) context).setAttribute(property, value);
55      }
56  }