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.ArrayList;
020    import java.util.Enumeration;
021    
022    import org.apache.commons.jxpath.DynamicPropertyHandler;
023    
024    /**
025     * Implementation of the {@link DynamicPropertyHandler} interface that provides
026     * access to attributes of a {@link PageScopeContext}.
027     *
028     * @author Dmitri Plotnikov
029     * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
030     */
031    public class PageScopeContextHandler implements DynamicPropertyHandler {
032    
033        private static final int DEFAULT_LIST_SIZE = 16;
034    
035        public String[] getPropertyNames(Object pageScope) {
036            Enumeration e = ((PageScopeContext) pageScope).getAttributeNames();
037            ArrayList list = new ArrayList(DEFAULT_LIST_SIZE);
038            while (e.hasMoreElements()) {
039                list.add(e.nextElement());
040            }
041            return (String[]) list.toArray(new String[list.size()]);
042        }
043    
044        public Object getProperty(Object pageScope, String property) {
045            return ((PageScopeContext) pageScope).getAttribute(property);
046        }
047    
048        public void setProperty(Object pageScope, String property, Object value) {
049            ((PageScopeContext) pageScope).setAttribute(property, value);
050        }
051    }