uk.ac.starlink.table.gui
Class SaveWorker

java.lang.Object
  uk.ac.starlink.table.gui.SaveWorker

public abstract class SaveWorker
extends java.lang.Object

Handles asynchronous table saving. To save a table, create an instance of this class with a suitable implementation of the attemptSave(uk.ac.starlink.table.StarTable[]) method and call invoke() on it from the event dispatch thread. A progress bar will advise the user on how the save is going, and if the save fails a popup will advise of the error. When the save has completed one way or another, the done(boolean) method will be called.

Since:

24 Feb 2005

Constructor Summary

protected	SaveWorker(java.awt.Component parent, StarTable[] tables, java.lang.String location) Constructs a save worker which will use its own popup widow for progress display.
protected	SaveWorker(javax.swing.JProgressBar progBar, StarTable[] tables, java.lang.String location) Constructs a save worker which will use a given progress bar for progress display.

Method Summary

protected abstract void	attemptSave(StarTable[] tables) This method should do the work of saving the given tables.
void	cancel() Interrupts any save which is in progress.
protected abstract void	done(boolean success) Called from the event dispatch thread when the save has completed.
void	invoke() Begins the save.

Methods inherited from class java.lang.Object

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

Constructor Detail

SaveWorker

protected SaveWorker(java.awt.Component parent,
                     StarTable[] tables,
                     java.lang.String location)

Constructs a save worker which will use its own popup widow for progress display.

Parameters:

parent - parent component used for progress bar popup

tables - tables to be saved

location - string identifying the save destination - used for display purposes only

SaveWorker

protected SaveWorker(javax.swing.JProgressBar progBar,
                     StarTable[] tables,
                     java.lang.String location)

Constructs a save worker which will use a given progress bar for progress display.

Parameters:

progBar - progress bar which will be updated to display progress

tables - tables to be saved

location - string identifying the save destination - used for display purposes only

Method Detail

attemptSave

protected abstract void attemptSave(StarTable[] tables)
                             throws java.io.IOException

This method should do the work of saving the given tables. It will not be called on the event dispatch thread, so may take some time to execute.

Parameters:

tables - tables to save

Throws:

java.io.IOException - if the table cannot be saved

done

protected abstract void done(boolean success)

Called from the event dispatch thread when the save has completed. The success argument indicates whether the table was saved successfully or not. If it was not, the user will already have been informed of this.

The default implementation does nothing, but subclasses may override it to react in some way to the save's completion.

Parameters:

success - save status

cancel

public void cancel()

Interrupts any save which is in progress. Call from the event dispatch thread.

invoke

public void invoke()

Begins the save. Should be invoked from the event dispatch thread.