[Biococoa-dev] Using an untyped class sequence
Charles Parnot
charles.parnot at gmail.com
Mon Jul 4 17:55:50 EDT 2005
Here is one situation where an untyped sequence class can be simpler
to use. You have a BCSequence displayed in a nice BCSequenceView. The
user chooses 'Reverse Complement' in the toolbar of the sequence
window (the delegate is thus first responder and is self below). You
want to create a new sequence from it.
- (IBAction)reverseComplement:(id)sender
{
BCSequence *initialSequence = [self sequence];
[MyDocument newSequenceWindowWithSequence:[initialSequence
reverseComplement]];
}
Now, I tried to think of how to implement that with typed sequences,
though the overall architecture of the app might end up being quite
different.
- (IBAction)reverseComplement:(id)sender
{
BCSequence *initialSequence = [self selectedSequence];
BCSequence *newSequence;
if ( [originalSequence type] == BCSequenceDNA )
newSequence = [(BCDNASequence *)initialSequence
reverseComplement]; //cast to avoid compiler warnings
else if ( [originalSequence type] == BCSequenceDNA )
newSequence = [(BCDNASequence *)initialSequence
reverseComplement]; //cast to avoid compiler warnings
else
return;
[MyDocument newSequenceWindowWithSequence:newSequence];
}
I know it is a contrived example, but I am just thinking a general
sequence view program à-la DNAStrider.
charles
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Charles Parnot
charles.parnot at gmail.com
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