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
22 import javax.servlet.jsp.PageContext;
23
24 import org.apache.commons.jxpath.DynamicPropertyHandler;
25
26 /**
27 * Implementation of the {@link DynamicPropertyHandler} interface that provides
28 * access to attributes of a {@link PageContext} in all scopes.
29 *
30 * @author Dmitri Plotnikov
31 * @version $Revision: 668329 $ $Date: 2008-06-16 23:59:48 +0200 (Mo, 16 Jun 2008) $
32 */
33 public class PageContextHandler implements DynamicPropertyHandler {
34
35 public String[] getPropertyNames(Object pageContext) {
36 HashSet list = new HashSet();
37 Enumeration e =
38 ((PageContext) pageContext).getAttributeNamesInScope(
39 PageContext.PAGE_SCOPE);
40 while (e.hasMoreElements()) {
41 list.add(e.nextElement());
42 }
43 e =
44 ((PageContext) pageContext).getAttributeNamesInScope(
45 PageContext.REQUEST_SCOPE);
46 while (e.hasMoreElements()) {
47 list.add(e.nextElement());
48 }
49 e =
50 ((PageContext) pageContext).getAttributeNamesInScope(
51 PageContext.SESSION_SCOPE);
52 while (e.hasMoreElements()) {
53 list.add(e.nextElement());
54 }
55 e =
56 ((PageContext) pageContext).getAttributeNamesInScope(
57 PageContext.APPLICATION_SCOPE);
58 while (e.hasMoreElements()) {
59 list.add(e.nextElement());
60 }
61 return (String[]) list.toArray(new String[list.size()]);
62 }
63
64 /**
65 * Returns <code>pageContext.findAttribute(property)</code>.
66 * @param pageContext to search
67 * @param property name
68 * @return Object value
69 */
70 public Object getProperty(Object pageContext, String property) {
71 return ((PageContext) pageContext).findAttribute(property);
72 }
73
74 public void setProperty(Object pageContext, String property, Object value) {
75 ((PageContext) pageContext).setAttribute(
76 property,
77 value,
78 PageContext.PAGE_SCOPE);
79 }
80 }