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.configuration2.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 * @since 1.1
032 */
033public class ServletFilterConfiguration extends BaseWebConfiguration
034{
035    /** Stores the wrapped filter config.*/
036    protected FilterConfig config;
037
038    /**
039     * Create a ServletFilterConfiguration using the filter initialization parameters.
040     *
041     * @param config the filter configuration
042     */
043    public ServletFilterConfiguration(final FilterConfig config)
044    {
045        this.config = config;
046    }
047
048    @Override
049    protected Object getPropertyInternal(final String key)
050    {
051        return handleDelimiters(config.getInitParameter(key));
052    }
053
054    @Override
055    protected Iterator<String> getKeysInternal()
056    {
057        // According to the documentation of getInitParameterNames() the
058        // enumeration is of type String.
059        final Enumeration<String> en = config.getInitParameterNames();
060        return Collections.list(en).iterator();
061    }
062}