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