118 lines
2.2 KiB
Plaintext
118 lines
2.2 KiB
Plaintext
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:- object(class,
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implements(classp),
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instantiates(class),
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specializes(abstract_class)).
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:- info([
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version is 1.0,
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authors is 'Paulo Moura',
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date is 2000/7/24,
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comment is 'Default metaclass for all classes.']).
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:- private(instance_counter_/1).
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:- dynamic(instance_counter_/1).
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:- mode(instance_counter_(?integer), zero_or_one).
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:- info(instance_counter_/1, [
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comment is 'Stores a counter of created instances.',
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argnames is ['Counter']]).
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new(Object) :-
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::new(Object, []).
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new(Object, Options) :-
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valid_new_identifier(Object),
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self(Self),
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create_object(Object, [instantiates(Self)], [], []),
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Object::init(Options).
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clone(Object, Clone) :-
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self(Self),
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sender(Sender),
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throw(error(subclass_responsability, Self::clone(Object, Clone), Sender)).
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delete(Object) :-
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::delete(Object, []).
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delete(Object, Options) :-
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::instance(Object),
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Object::free(Options),
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abolish_object(Object).
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delete_all :-
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::delete_all([]).
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delete_all(Options) :-
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::instance(Instance),
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object_property(Instance, (dynamic)),
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::delete(Instance, Options),
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fail.
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delete_all(_) :-
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\+ (::instance(Instance),
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object_property(Instance, (dynamic))).
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instance_base_name(i).
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instance_counter_(0).
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valid_new_identifier(Identifier) :-
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var(Identifier), !,
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retract(instance_counter_(Last)),
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::instance_base_name(Base),
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functor(Base, Functor, Arity),
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number_codes(Arity, Codes),
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atom_codes(Atom, Codes),
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repeat,
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next_integer(Last, Next),
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number_codes(Next, Codes2),
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atom_codes(Atom2, Codes2),
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atom_concat(Functor, Atom2, Identifier),
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atom_concat(Identifier, Atom, Prefix),
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\+ current_predicate(Prefix/_),
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asserta(instance_counter_(Next)),
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!.
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valid_new_identifier(Identifier) :-
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once((atom(Identifier); compound(Identifier))),
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functor(Identifier, Functor, Arity),
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number_codes(Arity, Codes),
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atom_codes(Atom, Codes),
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atom_concat(Functor, Atom, Prefix),
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\+ current_predicate(Prefix/_).
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next_integer(N, N1) :-
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N1 is N + 1.
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next_integer(N, N2) :-
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N1 is N + 1,
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next_integer(N1, N2).
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equals(Instance1, Instance2) :-
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self(Self),
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sender(Sender),
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throw(error(subclass_responsability, Self::equals(Instance1, Instance2), Sender)).
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abstract_class :-
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fail.
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:- end_object.
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