    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;
    023import java.util.Objects;
    024
    025import javax.servlet.Servlet;
    026import javax.servlet.ServletConfig;
    027
    028/**
    029 * A configuration wrapper around a {@link ServletConfig}. This configuration is read only, adding or removing a
    030 * property will throw an UnsupportedOperationException.
    031 *
    032 * @since 1.1
    033 */
    034public class ServletConfiguration extends BaseWebConfiguration {
    035
    036    /** Stores a reference to the wrapped {@code ServletConfig}. */
    037    protected ServletConfig config;
    038
    039    /**
    040     * Creates a ServletConfiguration using the initialization parameter of the specified servlet.
    041     *
    042     * @param servlet the servlet
    043     */
    044    public ServletConfiguration(final Servlet servlet) {
    045        this(Objects.requireNonNull(servlet, "servlet").getServletConfig());
    046    }
    047
    048    /**
    049     * Creates a ServletConfiguration using the servlet initialization parameters.
    050     *
    051     * @param config the servlet configuration
    052     */
    053    public ServletConfiguration(final ServletConfig config) {
    054        this.config = Objects.requireNonNull(config, "config");
    055    }
    056
    057    @Override
    058    protected Iterator<String> getKeysInternal() {
    059        // According to the documentation of getInitParameterNames() the
    060        // enumeration is of type String.
    061        final Enumeration<String> en = config.getInitParameterNames();
    062        return Collections.list(en).iterator();
    063    }
    064
    065    @Override
    066    protected Object getPropertyInternal(final String key) {
    067        return handleDelimiters(config.getInitParameter(key));
    068    }
    069}