    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.ServletConfig;
    026
    027    /**
    028     * A configuration wrapper around a {@link ServletConfig}. This configuration
    029     * is read only, adding or removing a property will throw an
    030     * UnsupportedOperationException.
    031     *
    032     * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
    033     * @version $Id: ServletConfiguration.java 1211128 2011-12-06 20:56:41Z oheger $
    034     * @since 1.1
    035     */
    036    public class ServletConfiguration extends BaseWebConfiguration
    037    {
    038        /** Stores a reference to the wrapped {@code ServletConfig}.*/
    039        protected ServletConfig config;
    040
    041        /**
    042         * Create a ServletConfiguration using the initialization parameter of
    043         * the specified servlet.
    044         *
    045         * @param servlet the servlet
    046         */
    047        public ServletConfiguration(Servlet servlet)
    048        {
    049            this(servlet.getServletConfig());
    050        }
    051
    052        /**
    053         * Create a ServletConfiguration using the servlet initialization parameters.
    054         *
    055         * @param config the servlet configuration
    056         */
    057        public ServletConfiguration(ServletConfig config)
    058        {
    059            this.config = config;
    060        }
    061
    062        public Object getProperty(String key)
    063        {
    064            return handleDelimiters(config.getInitParameter(key));
    065        }
    066
    067        public Iterator<String> getKeys()
    068        {
    069            // According to the documentation of getInitParameterNames() the
    070            // enumeration is of type String.
    071            @SuppressWarnings("unchecked")
    072            Enumeration<String> en = config.getInitParameterNames();
    073            return Collections.list(en).iterator();
    074        }
    075    }