Package 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 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	Description
CommandLauncherImpl()

Method Summary

Modifier and Type	Method	Description
Process	exec(CommandLine cmd, Map<String,String> env)	Executes the given command in a new process.
abstract Process	exec(CommandLine cmd, Map<String,String> env, File workingDir)	Executes 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

CommandLauncherImpl

public CommandLauncherImpl()

Method Details

exec

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

Description copied from interface: CommandLauncher

Executes 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:

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

exec

public abstract Process exec(CommandLine cmd,
 Map<String,String> env,
 File workingDir)
                      throws IOException

Description copied from interface: CommandLauncher

Executes 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:

IOException - if trying to change directory.

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

Parameters:

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

Returns:

true if exitValue signals a failure.

See Also:

• CommandLauncher.isFailure(int)