From: dblack@...
Date: 2003-11-04T09:49:24+09:00
Subject: Re: exceptions

Hi --

On Tue, 4 Nov 2003, Joel VanderWerf wrote:

> Simon Kitching wrote:
> > Hi,
> >
> > I'm puzzled about how to associate custom information with an Exception
> > class I am throwing.
> >
> > In Java, I would do this
> >
> >   MyException e = new MyException("foo", "bar", "baz");
> >   e.doSomething();
> >   e.setWidget(widget);
> >   // now e is all set up, so throw it
> >   throw e;
> >
> > Can this sort of thing be done in Ruby??
>
> Yep:
>
> class MyException < Exception
>    def initialize(*args); @args = args; end

I'm not sure what Exception's initialize does, but it might be good
to call super here too.

>    def doSomething; end
>    def setWidget(widget); @widget = widget; end

That's also a nice place for:

  attr_accessor :widget  # or just attr_writer if that's what's wanted

which then allows for:

  e.widget = "whatever"


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav