On Jun 23, 2008, at 11:27 AM, Mike Schrag wrote:
Well, this works, but seems like I'm reinventing the wheel.
NSMutableArray<Finished> descendantFinisheds = new
NSMutableArray<Finished>();
for (Part aPart : descendantParts()) {
if (aPart instanceof Finished) {
descendantFinisheds.addObject((Finished) aPart);
}
}
And if I can force the casting of one object, why can't I force the
casting of the Array using (NSArray<Finished>) EOQual...?
Filtering with a qualifier is a generic (uh .. not generic like
generics) implementation of this filtering, so it's impossible to
enforce the rule you're specifying statically. You are going to
have to cast somewhere. In your case, you're casting the objects
inside the array, but you should be able to cast the resultant array
from the original filter also. You may need to specify your
original array as NSMutableArray<? extends Part> instead of
NSMutableArray<Part>, but regardless you're going to have to cast
somewhere in the chain to do this.
Here's my original code, which gives me a compile error (not warning):
public NSArray<Finished> descendantFinisheds() {
NSMutableArray<Object> args = new NSMutableArray<Object>();
args.addObject(_PartType.fetchOneFinished(editingContext()));
EOQualifier qual = EOQualifier.qualifierWithQualifierFormat("partType
= %@", args);
NSArray<Finished> descendantFinisheds =
EOQualifier.filteredArrayWithQualifier(descendantParts(), qual);
return descendantFinisheds;
}
It errors on the
EOQualifier.filteredArrayWithQualifier(descendantParts(), qual)
stating "Type mismatch: cannot convert from NSArray<Part> to
NSArray<Finished>"
If I try casting the results of the filteredArrayWithQualifier like so:
NSArray<Finished> descendantFinisheds =
(NSArray<Finished>)
EOQualifier.filteredArrayWithQualifier(descendantParts(), qual);
I get the same Type mismatch compiler error.
I tried using <? extends Part> instead in the method signature, but
later when I use the results of this method, I must have a Finished
because I call methods that only a Finished has.
Grr..
Dave
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