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     */
018    
019    package org.apache.commons.exec.launcher;
020    
021    import java.io.IOException;
022    import java.util.Map;
023    
024    import org.apache.commons.exec.CommandLine;
025    
026    /**
027     * A command launcher that proxies another command launcher. Sub-classes
028     * override exec(args, env, workdir)
029     */
030    public abstract class CommandLauncherProxy extends CommandLauncherImpl {
031    
032        public CommandLauncherProxy(final CommandLauncher launcher) {
033            myLauncher = launcher;
034        }
035    
036        private final CommandLauncher myLauncher;
037    
038        /**
039         * Launches the given command in a new process. Delegates this method to the
040         * proxied launcher
041         * 
042         * @param cmd
043         *            the command line to execute as an array of strings
044         * @param env
045         *            the environment to set as an array of strings
046         * @throws IOException
047         *             forwarded from the exec method of the command launcher
048         */
049        public Process exec(final CommandLine cmd, final Map env)
050                throws IOException {
051            return myLauncher.exec(cmd, env);
052        }
053    }