Re: firing property change events: use copies or originals?

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#7323

From: Torsten Welches
Date: Wed, 27 Jun 2001 05:24

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"dnoyeB" <lamont_gilbert @ rigidsoftware.com> wrote:

>I would prefer to pass a copy of the object, but is this 
>proper?  Am I just paranoid? Which is the correct thing to 
>pass, the original object the events are firing about, or 
>copies?

There's nothing in the documentation that implies handing out 
clones would be improper. It merely says:
"the old value for the property, expressed as an Object"

I don't think there is a correct and an incorrect way. It
totally depends on what your application is doing, whether it 
really would be dangerous to "use" the old value object and so 
on. A receiver of a PropertyChangeEvent knows that the old value
no longer is valid, he/she probably wouldn't care to change it 
anyway. 
And then comes paranoia... <g>

If you do pass a clone you should document it IMO.

Torsten

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