    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 * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
    032 * @since 1.1
    033 */
    034public class ServletFilterConfiguration extends BaseWebConfiguration
    035{
    036    /** Stores the wrapped filter config.*/
    037    protected FilterConfig config;
    038
    039    /**
    040     * Create a ServletFilterConfiguration using the filter initialization parameters.
    041     *
    042     * @param config the filter configuration
    043     */
    044    public ServletFilterConfiguration(final FilterConfig config)
    045    {
    046        this.config = config;
    047    }
    048
    049    @Override
    050    protected Object getPropertyInternal(final String key)
    051    {
    052        return handleDelimiters(config.getInitParameter(key));
    053    }
    054
    055    @Override
    056    protected Iterator<String> getKeysInternal()
    057    {
    058        // According to the documentation of getInitParameterNames() the
    059        // enumeration is of type String.
    060        final Enumeration<String> en = config.getInitParameterNames();
    061        return Collections.list(en).iterator();
    062    }
    063}