    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 *     https://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;
    023import java.util.Objects;
    024
    025import javax.servlet.FilterConfig;
    026
    027/**
    028 * A configuration wrapper around a {@link FilterConfig}. This configuration is read only, adding or removing a property
    029 * will throw an 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        this.config = Objects.requireNonNull(config, "config");
    045    }
    046
    047    @Override
    048    protected Iterator<String> getKeysInternal() {
    049        // According to the documentation of getInitParameterNames() the
    050        // enumeration is of type String.
    051        final Enumeration<String> en = config.getInitParameterNames();
    052        return Collections.list(en).iterator();
    053    }
    054
    055    @Override
    056    protected Object getPropertyInternal(final String key) {
    057        return handleDelimiters(config.getInitParameter(key));
    058    }
    059}