Package 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	Description
VmsCommandLauncher()

Method Summary

Modifier and Type	Method	Description
Process	exec(CommandLine cmd, Map<String,String> env)	Launches the given command in a new process.
Process	exec(CommandLine cmd, Map<String,String> env, File workingDir)	Launches the given command in a new process, in the given working directory.
boolean	isFailure(int exitValue)	Tests 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 Details

VmsCommandLauncher

public VmsCommandLauncher()

Method Details

exec

public Process exec(CommandLine cmd,
 Map<String,String> 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<String,String> 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(String[], String[], File).

isFailure

public boolean isFailure(int exitValue)

Description copied from interface: CommandLauncher

Tests 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)