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The methods that are provided to get and set object attributes are known in object-oriented circles as accessors and mutators. Despite this jargon, they are really just subroutines that set values in a hash, array, or whatever data type we used to implement the object. Here is an example of accessor and mutator methods for the suit attribute of the Game::Card class (we can just duplicate them for the name attribute): # get passed card object and return suit attribute sub get_suit ($) { return shift->{suit}; } # set suit attribute on passed card object sub set_suit ($$) { $_[0]->{suit} = $_[1]; } Note that the prototypes here are purely for our reading benefit. While Perl accepts them, the interpreter does not know, at the time it compiles the call, which object class will actually be called as a result. Consequently, Perl cannot verify that the prototype is correct. If we were to call the method as a subroutine without using ->, the prototype would be honored, but, of course, we would lose the ability to inherit. (This limitation of prototypes will be lifted in Perl 6.)

Having separate accessor and mutator methods can be a little awkward, however, especially if we have a lot of attributes to deal with An object with 20 possible attributes needs 40 subroutine definitions to handle them A popular alternative is to combine accessors and mutators into one method, using the number of arguments passed to determine what to do For example: sub suit ($;$) { my ($self, $suit) = @_; if ($suit) { my $oldsuit = $self->{suit}; $self->{suit} = $suit; return $oldsuit; } return $self->{suit}; } This accessor/mutator method gets the current value of the suit attribute if no value is passed or sets it if one is As a bonus, it also makes a note of and returns the old value of the attribute.

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Either way, it s still a change of habit for most people so it requires effort to avoid the anemic domain model Hibernate works natively on your beans so you can put your business logic directly into those beans and work with a rich domain model, without having to worry about adding business logic somewhere else, just to suit the ORM..

We do not need to check whether the attribute exists because we know (because we wrote the class and defined the behavior of its interface) that the constructor always sets the hash keys up, even if they have undefined values This method does not allow us to unset the suit either, in this case intentionally If we want to permit the suit to be unset, we will have to check to see if we were passed a second argument of undef as opposed to no second argument at all We can do that by replacing the line if ($suit) { with if (scalar(@_)>1) { Or, more tersely: if ($#_) { Either replacement checks that at least two arguments were passed to the method, without checking what the second argument is, so undef can be passed as the new attribute value, as can an empty string.

However, since the fullname method concatenates this attribute into a string, we probably do not want to allow undef, so this is probably the best variation to use: sub suit ($;$) { my ($self, $suit) = @_; if (defined $suit) { my $oldsuit = $self->{suit}; $self->{suit} = $suit; return $oldsuit; } return $self->{suit}; } This will allow an empty string to set the attribute, but not undef..

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Combining accessors and mutators into one method is an improvement over the case of separate accessors and mutators methods, at least in terms of the number of subroutines we define, but it comes at the cost of increased code complexity.

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