org.eigenbase.util
Class MainApp

java.lang.Object
  org.eigenbase.util.MainApp

public abstract class MainApp
extends Object

Abstract base class for a Java application invoked from the command-line.

Example usage:

public class MyClass extends MainApp {
     public static void main(String[] args) {
         new MyClass(args).run();
     }
     public void mainImpl() {
         System.out.println("Hello, world!");
     }
 }

Since:

Aug 31, 2003

Version:

$Id: //open/dev/farrago/src/org/eigenbase/util/MainApp.java#9 $

Author:

jhyde

Field Summary

protected String[]	args
private int	exitCode
private OptionsList	options

Constructor Summary

protected

MainApp(String[] args)

Method Summary

void	handle(Throwable throwable) Handles an error.
protected void	initializeOptions() Initializes the application.
abstract void	mainImpl() Does the work of the application.
void	parseOptions(OptionsList.OptionHandler values)
void	run() Does the work of the application, handles any errors, then calls System.exit(int) to terminate the application.
void	setExitCode(int exitCode) Sets the code which this program will return to the operating system.

Methods inherited from class java.lang.Object

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

Field Detail

args

protected final String[] args

options

private OptionsList options

exitCode

private int exitCode

Constructor Detail

MainApp

protected MainApp(String[] args)

Method Detail

mainImpl

public abstract void mainImpl()
                       throws Exception

Does the work of the application. Derived classes must implement this method; they can throw any exception they like, and run() will clean up after them.

Throws:

Exception

run

public final void run()

Does the work of the application, handles any errors, then calls System.exit(int) to terminate the application.

setExitCode

public void setExitCode(int exitCode)

Sets the code which this program will return to the operating system.

Parameters:

exitCode - Exit code

See Also:

System.exit(int)

handle

public void handle(Throwable throwable)

Handles an error. Derived classes may override this method to provide their own error-handling.

Parameters:

throwable - Error to handle.

parseOptions

public void parseOptions(OptionsList.OptionHandler values)

initializeOptions

protected void initializeOptions()

Initializes the application.