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    }