org.dellroad.jvser.client
Class MainClass

java.lang.Object
  org.dellroad.jvser.client.MainClass

Direct Known Subclasses:

Main

public abstract class MainClass
extends Object

Support superclass for command line classes.

Field Summary

protected Logger

log

Constructor Summary

protected

MainClass()

Method Summary

protected void	doMain(String[] args) Invokes run(java.lang.String[]), catching any exceptions thrown and exiting with a non-zero value if and only if an exception was caught.
protected void	errout(String message) Emit an error message an exit with exit value 1.
protected abstract int	run(String[] args) Subclass main implementation.
protected void	setupLogging(Level logLevel) Setup logging.
protected void	usageError() Print the usage message and exit with exit value 1.
protected abstract void	usageMessage() Display the usage message to standard error.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final Logger log

Constructor Detail

MainClass

protected MainClass()

Method Detail

run

protected abstract int run(String[] args)
                    throws Exception

Subclass main implementation. This method is free to throw exceptions; these will be displayed on standard error and converted into non-zero exit values.

Returns:

exit value

Throws:

Exception

usageMessage

protected abstract void usageMessage()

Display the usage message to standard error.

usageError

protected void usageError()

Print the usage message and exit with exit value 1.

setupLogging

protected void setupLogging(Level logLevel)

Setup logging.

errout

protected final void errout(String message)

Emit an error message an exit with exit value 1.

doMain

protected void doMain(String[] args)

Invokes run(java.lang.String[]), catching any exceptions thrown and exiting with a non-zero value if and only if an exception was caught.

The concrete class' main() method should invoke this method.