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 import java.util.HashSet;
021
022 import javax.servlet.jsp.PageContext;
023
024 import org.apache.commons.jxpath.DynamicPropertyHandler;
025
026 /**
027 * Implementation of the {@link DynamicPropertyHandler} interface that provides
028 * access to attributes of a {@link PageContext} in all scopes.
029 *
030 * @author Dmitri Plotnikov
031 * @version $Revision: 668329 $ $Date: 2008-06-16 16:59:48 -0500 (Mon, 16 Jun 2008) $
032 */
033 public class PageContextHandler implements DynamicPropertyHandler {
034
035 public String[] getPropertyNames(Object pageContext) {
036 HashSet list = new HashSet();
037 Enumeration e =
038 ((PageContext) pageContext).getAttributeNamesInScope(
039 PageContext.PAGE_SCOPE);
040 while (e.hasMoreElements()) {
041 list.add(e.nextElement());
042 }
043 e =
044 ((PageContext) pageContext).getAttributeNamesInScope(
045 PageContext.REQUEST_SCOPE);
046 while (e.hasMoreElements()) {
047 list.add(e.nextElement());
048 }
049 e =
050 ((PageContext) pageContext).getAttributeNamesInScope(
051 PageContext.SESSION_SCOPE);
052 while (e.hasMoreElements()) {
053 list.add(e.nextElement());
054 }
055 e =
056 ((PageContext) pageContext).getAttributeNamesInScope(
057 PageContext.APPLICATION_SCOPE);
058 while (e.hasMoreElements()) {
059 list.add(e.nextElement());
060 }
061 return (String[]) list.toArray(new String[list.size()]);
062 }
063
064 /**
065 * Returns <code>pageContext.findAttribute(property)</code>.
066 * @param pageContext to search
067 * @param property name
068 * @return Object value
069 */
070 public Object getProperty(Object pageContext, String property) {
071 return ((PageContext) pageContext).findAttribute(property);
072 }
073
074 public void setProperty(Object pageContext, String property, Object value) {
075 ((PageContext) pageContext).setAttribute(
076 property,
077 value,
078 PageContext.PAGE_SCOPE);
079 }
080 }