    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 jakarta.servlet.Servlet;
    026import jakarta.servlet.ServletContext;
    027
    028/**
    029 * A configuration wrapper to read the initialization parameters of a servlet context. This configuration is read only,
    030 * adding or removing a property will throw an UnsupportedOperationException.
    031 *
    032 * @since 2.12.0
    033 */
    034public class JakartaServletContextConfiguration extends BaseWebConfiguration {
    035
    036    /** Stores the wrapped servlet context. */
    037    protected ServletContext context;
    038
    039    /**
    040     * Create a ServletContextConfiguration using the context of the specified servlet.
    041     *
    042     * @param servlet the servlet
    043     */
    044    public JakartaServletContextConfiguration(final Servlet servlet) {
    045        this.context = Objects.requireNonNull(servlet, "servlet").getServletConfig().getServletContext();
    046    }
    047
    048    /**
    049     * Create a ServletContextConfiguration using the servlet context initialization parameters.
    050     *
    051     * @param context the servlet context
    052     */
    053    public JakartaServletContextConfiguration(final ServletContext context) {
    054        this.context = Objects.requireNonNull(context, "context");
    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 = context.getInitParameterNames();
    062        return Collections.list(en).iterator();
    063    }
    064
    065    @Override
    066    protected Object getPropertyInternal(final String key) {
    067        return handleDelimiters(context.getInitParameter(key));
    068    }
    069}