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    }