> Hmm,
>
> IMHO this seems not very Java-like as it also would require to augment all
> calls to lower
> level routines with error checking, just what one would like to avoid (Or
> did I get something wrong?)
>
> Wouldn´t it be better to use to use a user-defined exception to throw at
> the intended point
> of premature return and use try-catch in the run method (which
> unfortunatelly also would not leave the
> remaining source code totally unchanged, as one would need to declare all
> intermediate routines
> as "throws xxx", which however would only be required at the top of each
> method, not on each call..
>
> Just my ideas...
>
> I hhink some time ago we already had this topic somewhere in this forum!?
>
> Joachim
>
>
>
>
>
> Michael Doube
> <m.doube@IMPERIAL
> .AC.UK> An
> Gesendet von:
[hidden email]
> ImageJ Interest Kopie
> Group
> <
[hidden email]. Thema
> GOV> Re: Return On Error
>
>
> 06.11.2009 21:11
>
>
> Bitte antworten
> an
> ImageJ Interest
> Group
> <
[hidden email].
> GOV>
>
>
>
>
>
>
> Hi David
>
> In a PlugIn the run() method returns void so you can just
>
> return;
>
> If one of the other methods that run() calls finds an error it could
> return an error value to run(), which run() then uses to decide whether
> or not to return, or do something else.
>
> A common use is to call a showDialog() method in the run() method, which
> shows a dialog for user input and returns false if the dialog is
> cancelled. When the dialog method returns false then run() returns and
> the plugin terminates.
>
> public void run(String arg){
> if (!showDialog()){
> return;
> }
>
> //otherwise keep executing run()
>
> }
>
> If you hit OK, showDialog() returns true and the plugin continues.
>
> Michael
>
> David William Webster wrote:
>> Is there any way to return to ImageJ from a plugin when a potential error
>
>> is detected (e.g. if n input parameter has a bad value.) System.exit()
>> kicks me all the way out of ImageJ.
>>
>> David Webster
>
>
>
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