What you're doing will work, but storing the class name in each instance is overkill.
sub isFile {
my $self = shift if ref $_[0] && ref $_[0] eq $_[0]->{class};
my $file = shift; # a file in current directory expected
is still going to break if someone passes a reference argument that isn't an instance of the class. ($file will end up holding the errant reference.) You might as well just do
sub isFile {
my $self = shift if ref $_[0];
my $file = shift;
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