001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.jxpath.servlet;
018
019 import java.util.Enumeration;
020
021 import javax.servlet.jsp.PageContext;
022
023 /**
024 * A lightweight wrapper for {@link PageContext} that restricts access
025 * to attributes of the "page" scope. This object is needed so that
026 * XPath "foo" would lookup the attribute "foo" in all scopes, while
027 * "$page/foo" would only look in the "page" scope.
028 *
029 * @author Dmitri Plotnikov
030 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
031 */
032 public class PageScopeContext {
033 private PageContext pageContext;
034
035 /**
036 * Create a new PageScopeContext.
037 * @param pageContext base
038 */
039 public PageScopeContext(PageContext pageContext) {
040 this.pageContext = pageContext;
041 }
042
043 /**
044 * Returns attributes of the pageContext declared in the "page" scope.
045 * @return Enumeration of attribute names
046 */
047 public Enumeration getAttributeNames() {
048 return pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
049 }
050
051 /**
052 * Get the value of the specified attribute.
053 * @param attribute name
054 * @return Object
055 */
056 public Object getAttribute(String attribute) {
057 return pageContext.getAttribute(attribute, PageContext.PAGE_SCOPE);
058 }
059
060 /**
061 * Set the specified attribute.
062 * @param attribute to set
063 * @param value to set
064 */
065 public void setAttribute(String attribute, Object value) {
066 pageContext.setAttribute(attribute, value, PageContext.PAGE_SCOPE);
067 }
068 }