org.apache.commons.exec.launcher
Class CommandLauncherImpl

java.lang.Object
  extended by 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
CommandLauncherImpl()
           
 
Method Summary
 Process exec(CommandLine cmd, Map env)
          Launches the given command in a new process.
abstract  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

CommandLauncherImpl

public CommandLauncherImpl()
Method Detail

exec

public Process exec(CommandLine cmd,
                    Map env)
             throws 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:
IOException - if attempting to run a command in a specific directory

exec

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


Copyright © 2009 Apache Software Foundation. All Rights Reserved.