    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.ServletContext;
    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 ServletContext}.
    029     *
    030     * @author Dmitri Plotnikov
    031     * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
    032     */
    033    public class ServletContextHandler implements DynamicPropertyHandler {
    034
    035        private static final int DEFAULT_PROPERTY_COUNT = 16;
    036
    037        public String[] getPropertyNames(Object context) {
    038            HashSet list = new HashSet(DEFAULT_PROPERTY_COUNT);
    039            collectPropertyNames(list, context);
    040            return (String[]) list.toArray(new String[list.size()]);
    041        }
    042
    043        /**
    044         * Collect the property names from bean, storing in set.
    045         * @param set destination
    046         * @param bean to read
    047         */
    048        protected void collectPropertyNames(HashSet set, Object bean) {
    049            Enumeration e = ((ServletContext) bean).getAttributeNames();
    050            while (e.hasMoreElements()) {
    051                set.add(e.nextElement());
    052            }
    053        }
    054
    055        public Object getProperty(Object context, String property) {
    056            return ((ServletContext) context).getAttribute(property);
    057        }
    058
    059        public void setProperty(Object context, String property, Object value) {
    060            ((ServletContext) context).setAttribute(property, value);
    061        }
    062    }