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
018package org.apache.commons.configuration.web;
019
020import java.util.Collections;
021import java.util.Enumeration;
022import java.util.Iterator;
023
024import 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 */
035public 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}