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
21 import javax.servlet.jsp.PageContext;
22
23 /**
24 * A lightweight wrapper for {@link PageContext} that restricts access
25 * to attributes of the "page" scope. This object is needed so that
26 * XPath "foo" would lookup the attribute "foo" in all scopes, while
27 * "$page/foo" would only look in the "page" scope.
28 *
29 * @author Dmitri Plotnikov
30 * @version $Revision: 652845 $ $Date: 2008-05-02 19:46:46 +0200 (Fr, 02 Mai 2008) $
31 */
32 public class PageScopeContext {
33 private PageContext pageContext;
34
35 /**
36 * Create a new PageScopeContext.
37 * @param pageContext base
38 */
39 public PageScopeContext(PageContext pageContext) {
40 this.pageContext = pageContext;
41 }
42
43 /**
44 * Returns attributes of the pageContext declared in the "page" scope.
45 * @return Enumeration of attribute names
46 */
47 public Enumeration getAttributeNames() {
48 return pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
49 }
50
51 /**
52 * Get the value of the specified attribute.
53 * @param attribute name
54 * @return Object
55 */
56 public Object getAttribute(String attribute) {
57 return pageContext.getAttribute(attribute, PageContext.PAGE_SCOPE);
58 }
59
60 /**
61 * Set the specified attribute.
62 * @param attribute to set
63 * @param value to set
64 */
65 public void setAttribute(String attribute, Object value) {
66 pageContext.setAttribute(attribute, value, PageContext.PAGE_SCOPE);
67 }
68 }