org.apache.commons.exec.launcher

Class VmsCommandLauncher

java.lang.Object

org.apache.commons.exec.launcher.CommandLauncherImpl

org.apache.commons.exec.launcher.Java13CommandLauncher

org.apache.commons.exec.launcher.VmsCommandLauncher

All Implemented Interfaces:

CommandLauncher

public class VmsCommandLauncher
extends Java13CommandLauncher

A command launcher for VMS that writes the command to a temporary DCL script before launching commands. This is due to limitations of both the DCL interpreter and the Java VM implementation.

Constructor Summary

Constructors

Constructor and Description
VmsCommandLauncher()

Method Summary

Methods

Modifier and Type	Method and Description
Process	exec(CommandLine cmd, Map env) Launches the given command in a new process.
Process	exec(CommandLine cmd, Map env, 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

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

Constructor Detail

VmsCommandLauncher

public VmsCommandLauncher()

Method Detail

exec

public Process exec(CommandLine cmd,
           Map env)
             throws IOException

Launches the given command in a new process.

Specified by:

exec in interface CommandLauncher

Overrides:

exec in class CommandLauncherImpl

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:

IOException - if attempting to run a command in a specific directory

exec

public Process exec(CommandLine cmd,
           Map env,
           File workingDir)
             throws IOException

Launches the given command in a new process, in the given working directory. Note that under Java 1.3.1, 1.4.0 and 1.4.1 on VMS this method only works if workingDir is null or the logical JAVA$FORK_SUPPORT_CHDIR needs to be set to TRUE.

Specified by:

exec in interface CommandLauncher

Overrides:

exec in class Java13CommandLauncher

Parameters:

cmd - the command line to execute as an array of strings

env - the environment to set as an array of strings

workingDir - the working directory where the command should run

Returns:

the newly created process

Throws:

IOException - probably forwarded from Runtime#exec

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

Overrides:

isFailure in class CommandLauncherImpl

Parameters:

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

Returns:

true if exitValue signals a failure

See Also:

CommandLauncher.isFailure(int)