    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
    018    package org.apache.commons.configuration.web;
    019
    020    import java.util.Collections;
    021    import java.util.Enumeration;
    022    import java.util.Iterator;
    023
    024    import javax.servlet.Servlet;
    025    import javax.servlet.ServletContext;
    026
    027    /**
    028     * A configuration wrapper to read the initialization parameters of a servlet
    029     * context. This configuration is read only, adding or removing a property will
    030     * throw an UnsupportedOperationException.
    031     *
    032     * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
    033     * @version $Id: ServletContextConfiguration.java 1211129 2011-12-06 20:57:01Z oheger $
    034     * @since 1.1
    035     */
    036    public class ServletContextConfiguration extends BaseWebConfiguration
    037    {
    038        /** Stores the wrapped servlet context.*/
    039        protected ServletContext context;
    040
    041        /**
    042         * Create a ServletContextConfiguration using the context of
    043         * the specified servlet.
    044         *
    045         * @param servlet the servlet
    046         */
    047        public ServletContextConfiguration(Servlet servlet)
    048        {
    049            this.context = servlet.getServletConfig().getServletContext();
    050        }
    051
    052        /**
    053         * Create a ServletContextConfiguration using the servlet context
    054         * initialization parameters.
    055         *
    056         * @param context the servlet context
    057         */
    058        public ServletContextConfiguration(ServletContext context)
    059        {
    060            this.context = context;
    061        }
    062
    063        public Object getProperty(String key)
    064        {
    065            return handleDelimiters(context.getInitParameter(key));
    066        }
    067
    068        public Iterator<String> getKeys()
    069        {
    070            // According to the documentation of getInitParameterNames() the
    071            // enumeration is of type String.
    072            @SuppressWarnings("unchecked")
    073            Enumeration<String> en = context.getInitParameterNames();
    074            return Collections.list(en).iterator();
    075        }
    076    }