    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    }