    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.FilterConfig;
    025
    026    /**
    027     * A configuration wrapper around a {@link FilterConfig}. This configuration is
    028     * read only, adding or removing a property will throw an
    029     * UnsupportedOperationException.
    030     *
    031     * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
    032     * @version $Id: ServletFilterConfiguration.java 1211130 2011-12-06 20:57:19Z oheger $
    033     * @since 1.1
    034     */
    035    public class ServletFilterConfiguration extends BaseWebConfiguration
    036    {
    037        /** Stores the wrapped filter config.*/
    038        protected FilterConfig config;
    039
    040        /**
    041         * Create a ServletFilterConfiguration using the filter initialization parameters.
    042         *
    043         * @param config the filter configuration
    044         */
    045        public ServletFilterConfiguration(FilterConfig config)
    046        {
    047            this.config = config;
    048        }
    049
    050        public Object getProperty(String key)
    051        {
    052            return handleDelimiters(config.getInitParameter(key));
    053        }
    054
    055        public Iterator<String> getKeys()
    056        {
    057            // According to the documentation of getInitParameterNames() the
    058            // enumeration is of type String.
    059            @SuppressWarnings("unchecked")
    060            Enumeration<String> en = config.getInitParameterNames();
    061            return Collections.list(en).iterator();
    062        }
    063    }