comparing two MDMFile

gistfile1.m

- (NSComparisonResult)compare:(id)object
{
    if ([[self identifier] isEqualToString:[object identifier]]) return NSOrderedSame;
    NSComparisonResult result = [[self identifier] compare:[object identifier]];
    if (result != NSOrderedSame) return result;
    return [[self fileName] compare:[object fileName]];
}