[Jsynthlib-devel] Fwd: Overriding calculateChecksum

[Jeff W. <jww...@ya...>]

--- Joe Emenaker <jo...@em...> wrote:

> Date: Thu, 24 Feb 2005 03:01:42 +0000
> From: Joe Emenaker <jo...@em...>
> To: Jeff Weber <jww...@ya...>
> Subject: Overriding calculateChecksum
> 
> I came across this in your DM5 drivers....
> 
>         /** Calculates the checksum for the DM5 by
calling
>             * this.calculateChecksum(Patch patch,
int start, int end, int offset). This
>             * needs to be included to override the
version in the Driver class.
>             */
>         protected void calculateChecksum(Patch p) {
>             calculateChecksum(p, checksumStart,
checksumEnd, checksumOffset);
>         }
> 
> Actually, I don't think you have to include this. If
> you delete it, the 
> /un-overridden/ *calculateChecksum(Patch)* in Driver
> should /still/ call 
> your /overridden/ version of
> *calculateChecksum(Patch,int,int,int).
> 
> One of the nice things about inheritance.....
> 

Funny you should mention this. I was reviewing my code
and came across this just last week and I thought the
same thing. When I removed it I found that it actually
does not call the overridden method. It calls the
method in the Driver class. I used a debugger to
confirm it. I don't understand why this happens. Maybe
it's just something flakey with my system (OSX).

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