View Javadoc

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  package org.apache.commons.jxpath.servlet;
18  
19  import java.util.Enumeration;
20  import java.util.HashSet;
21  import java.util.Set;
22  
23  import javax.servlet.ServletContext;
24  
25  import org.apache.commons.jxpath.DynamicPropertyHandler;
26  
27  /**
28   * Implementation of the {@link DynamicPropertyHandler} interface that provides
29   * access to attributes of a {@link ServletContext}.
30   *
31   * @author Dmitri Plotnikov
32   * @version $Revision: 1190148 $ $Date: 2011-10-28 00:00:29 -0400 (Fri, 28 Oct 2011) $
33   */
34  public class ServletContextHandler implements DynamicPropertyHandler {
35  
36      private static final int DEFAULT_PROPERTY_COUNT = 16;
37  
38      public String[] getPropertyNames(Object context) {
39          Set list = new HashSet(DEFAULT_PROPERTY_COUNT);
40          collectPropertyNames(list, context);
41          return (String[]) list.toArray(new String[list.size()]);
42      }
43  
44      /**
45       * Collect the property names from bean, storing in set.
46       * @param set destination
47       * @param bean to read
48       */
49      protected void collectPropertyNames(Set set, Object bean) {
50          if (bean instanceof HttpSessionAndServletContext) {
51              bean = ((HttpSessionAndServletContext) bean).getServletContext();
52          }
53          Enumeration e = ((ServletContext) bean).getAttributeNames();
54          while (e.hasMoreElements()) {
55              set.add(e.nextElement());
56          }
57      }
58  
59      public Object getProperty(Object context, String property) {
60          return ((ServletContext) context).getAttribute(property);
61      }
62  
63      public void setProperty(Object context, String property, Object value) {
64          ((ServletContext) context).setAttribute(property, value);
65      }
66  }