PageScopeContext


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  
20  import javax.servlet.jsp.PageContext  ;
21  
22  /**
23   * A lightweight wrapper for PageContext that restricts access
24   * to attributes of the "page" scope.  This object is needed so that
25   * XPath "foo" would lookup the attribute "foo" in all scopes, while
26   * "$page/foo" would only look in the "page" scope.
27   *
28   * @author Dmitri Plotnikov
29   * @version $Revision: 1.5 $ $Date: 2004/02/29 14:17:40 $
30   */
31  public class PageScopeContext {
32      private PageContext   pageContext;
33  
34      public PageScopeContext(PageContext   pageContext) {
35          this.pageContext = pageContext;
36      }
37  
38      /**
39       * Returns attributes of the pageContext declared in the "page" scope.
40       */
41      public Enumeration   getAttributeNames() {
42          return pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
43      }
44  
45      public Object   getAttribute(String   attribute) {
46          return pageContext.getAttribute(attribute, PageContext.PAGE_SCOPE);
47      }
48  
49      public void setAttribute(String   attribute, Object   value) {
50          pageContext.setAttribute(attribute, value, PageContext.PAGE_SCOPE);
51      }
52  }
53
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