    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.Servlet;
    025import javax.servlet.ServletConfig;
    026
    027/**
    028 * A configuration wrapper around a {@link ServletConfig}. This configuration is read only, adding or removing a
    029 * property will throw an UnsupportedOperationException.
    030 *
    031 * @since 1.1
    032 */
    033public class ServletConfiguration extends BaseWebConfiguration {
    034
    035    /** Stores a reference to the wrapped {@code ServletConfig}. */
    036    protected ServletConfig config;
    037
    038    /**
    039     * Creates a ServletConfiguration using the initialization parameter of the specified servlet.
    040     *
    041     * @param servlet the servlet
    042     */
    043    public ServletConfiguration(final Servlet servlet) {
    044        this(servlet.getServletConfig());
    045    }
    046
    047    /**
    048     * Creates a ServletConfiguration using the servlet initialization parameters.
    049     *
    050     * @param config the servlet configuration
    051     */
    052    public ServletConfiguration(final ServletConfig config) {
    053        this.config = config;
    054    }
    055
    056    @Override
    057    protected Object getPropertyInternal(final String key) {
    058        return handleDelimiters(config.getInitParameter(key));
    059    }
    060
    061    @Override
    062    protected Iterator<String> getKeysInternal() {
    063        // According to the documentation of getInitParameterNames() the
    064        // enumeration is of type String.
    065        final Enumeration<String> en = config.getInitParameterNames();
    066        return Collections.list(en).iterator();
    067    }
    068}