org.apache.commons.exec.launcher

Class CommandLauncherImpl

java.lang.Object

org.apache.commons.exec.launcher.CommandLauncherImpl

All Implemented Interfaces:

CommandLauncher

Direct Known Subclasses:

CommandLauncherProxy, Java13CommandLauncher

public abstract class CommandLauncherImpl
extends java.lang.Object
implements CommandLauncher

A command launcher for a particular JVM/OS platform. This class is a general purpose command launcher which can only launch commands in the current working directory.

Constructor Summary

Constructors

Constructor and Description
CommandLauncherImpl()

Method Summary

Modifier and Type	Method and Description
java.lang.Process	exec(CommandLine cmd, java.util.Map<java.lang.String,java.lang.String> env) Launches the given command in a new process.
abstract java.lang.Process	exec(CommandLine cmd, java.util.Map<java.lang.String,java.lang.String> env, java.io.File workingDir) Launches the given command in a new process, in the given working directory.
boolean	isFailure(int exitValue) Checks whether exitValue signals a failure on the current system (OS specific).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CommandLauncherImpl

public CommandLauncherImpl()

Method Detail

exec

public java.lang.Process exec(CommandLine cmd,
                              java.util.Map<java.lang.String,java.lang.String> env)
                       throws java.io.IOException

Description copied from interface: CommandLauncher

Launches the given command in a new process.

Specified by:

exec in interface CommandLauncher

Parameters:

cmd - The command to execute

env - The environment for the new process. If null, the environment of the current process is used.

Returns:

the newly created process

Throws:

java.io.IOException - if attempting to run a command in a specific directory

exec

public abstract java.lang.Process exec(CommandLine cmd,
                                       java.util.Map<java.lang.String,java.lang.String> env,
                                       java.io.File workingDir)
                                throws java.io.IOException

Description copied from interface: CommandLauncher

Launches the given command in a new process, in the given working directory.

Specified by:

exec in interface CommandLauncher

Parameters:

cmd - The command to execute

env - The environment for the new process. If null, the environment of the current process is used.

workingDir - The directory to start the command in. If null, the current directory is used

Returns:

the newly created process

Throws:

java.io.IOException - if trying to change directory

isFailure

public boolean isFailure(int exitValue)

Description copied from interface: CommandLauncher

Checks whether exitValue signals a failure on the current system (OS specific).

Note 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.

Specified by:

isFailure in interface CommandLauncher

Parameters:

exitValue - the exit value (return code) to be checked

Returns:

true if exitValue signals a failure

See Also:

CommandLauncher.isFailure(int)