Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package org.apache.commons.exec.launcher; import java.io.File; import java.io.IOException; import java.util.Map; import org.apache.commons.exec.CommandLine; /** * Interface to shield the caller from the various platform-dependent * implementations. * * @version $Id: CommandLauncher.java 1636056 2014-11-01 21:12:52Z ggregory $ */ public interface CommandLauncher { /** * Launches the given command in a new process. * * @param cmd * The command to execute * @param env * The environment for the new process. If null, the environment * of the current process is used. * * @return the newly created process * @throws IOException * if attempting to run a command in a specific directory */ Process exec(final CommandLine cmd, final Map<String, String> env) throws IOException; /** * Launches the given command in a new process, in the given working * directory. * * @param cmd * The command to execute * @param env * The environment for the new process. If null, the environment * of the current process is used. * @param workingDir * The directory to start the command in. If null, the current * directory is used * * @return the newly created process * @throws IOException * if trying to change directory */ Process exec(final CommandLine cmd, final Map<String, String> env, final File workingDir) throws IOException; /** * Checks whether {@code exitValue} signals a failure on the current * system (OS specific). * <p> * <b>Note</b> that this method relies on the conventions of the OS, it * will return false results if the application you are running doesn't * follow these conventions. One notable exception is the Java VM provided * by HP for OpenVMS - it will return 0 if successful (like on any other * platform), but this signals a failure on OpenVMS. So if you execute a new * Java VM on OpenVMS, you cannot trust this method. * </p> * * @param exitValue the exit value (return code) to be checked * @return {@code true} if {@code exitValue} signals a failure */ boolean isFailure(final int exitValue); }