[Biococoa-dev] Using an untyped class sequence

[Charles Parnot]

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