2 package Moose::Meta::Class;
10 use Scalar::Util 'weaken', 'blessed', 'reftype';
12 our $VERSION = '0.06';
14 use base 'Class::MOP::Class';
16 __PACKAGE__->meta->add_attribute('roles' => (
24 $class->SUPER::initialize($pkg,
25 ':attribute_metaclass' => 'Moose::Meta::Attribute',
26 ':instance_metaclass' => 'Moose::Meta::Instance',
31 my ($self, $role) = @_;
32 (blessed($role) && $role->isa('Moose::Meta::Role'))
33 || confess "Roles must be instances of Moose::Meta::Role";
34 push @{$self->roles} => $role;
38 my ($self, $role_name) = @_;
40 || confess "You must supply a role name to look for";
41 foreach my $role (@{$self->roles}) {
42 return 1 if $role->does_role($role_name);
48 my ($self, $role_name) = @_;
50 || confess "You must supply a role name to look for";
51 foreach my $role (@{$self->roles}) {
52 return 1 if $role->excludes_role($role_name);
58 my ($class, %params) = @_;
59 my $self = $class->SUPER::new_object(%params);
60 foreach my $attr ($class->compute_all_applicable_attributes()) {
61 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
62 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
67 sub construct_instance {
68 my ($class, %params) = @_;
69 my $meta_instance = $class->get_meta_instance;
71 # the code below is almost certainly incorrect
72 # but this is foreign inheritence, so we might
73 # have to kludge it in the end.
74 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
75 foreach my $attr ($class->compute_all_applicable_attributes()) {
76 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
82 my ($self, $method_name) = @_;
83 (defined $method_name && $method_name)
84 || confess "You must define a method name";
86 my $sub_name = ($self->name . '::' . $method_name);
89 return 0 if !defined(&{$sub_name});
90 my $method = \&{$sub_name};
92 return 1 if blessed($method) && $method->isa('Moose::Meta::Role::Method');
93 return $self->SUPER::has_method($method_name);
96 sub add_override_method_modifier {
97 my ($self, $name, $method, $_super_package) = @_;
98 (!$self->has_method($name))
99 || confess "Cannot add an override method if a local method is already present";
100 # need this for roles ...
101 $_super_package ||= $self->name;
102 my $super = $self->find_next_method_by_name($name);
104 || confess "You cannot override '$name' because it has no super method";
105 $self->add_method($name => bless sub {
108 no warnings 'redefine';
109 local *{$_super_package . '::super'} = sub { $super->(@args) };
110 return $method->(@args);
111 } => 'Moose::Meta::Method::Overriden');
114 sub add_augment_method_modifier {
115 my ($self, $name, $method) = @_;
116 (!$self->has_method($name))
117 || confess "Cannot add an augment method if a local method is already present";
118 my $super = $self->find_next_method_by_name($name);
120 || confess "You cannot augment '$name' because it has no super method";
121 my $_super_package = $super->package_name;
122 # BUT!,... if this is an overriden method ....
123 if ($super->isa('Moose::Meta::Method::Overriden')) {
124 # we need to be sure that we actually
125 # find the next method, which is not
126 # an 'override' method, the reason is
127 # that an 'override' method will not
128 # be the one calling inner()
129 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
130 $_super_package = $real_super->package_name;
132 $self->add_method($name => sub {
135 no warnings 'redefine';
136 local *{$_super_package . '::inner'} = sub { $method->(@args) };
137 return $super->(@args);
141 sub _find_next_method_by_name_which_is_not_overridden {
142 my ($self, $name) = @_;
143 my @methods = $self->find_all_methods_by_name($name);
144 foreach my $method (@methods) {
145 return $method->{code}
146 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
151 package Moose::Meta::Method::Overriden;
156 our $VERSION = '0.01';
158 use base 'Class::MOP::Method';
168 Moose::Meta::Class - The Moose metaclass
172 This is a subclass of L<Class::MOP::Class> with Moose specific
175 For the most part, the only time you will ever encounter an
176 instance of this class is if you are doing some serious deep
177 introspection. To really understand this class, you need to refer
178 to the L<Class::MOP::Class> documentation.
188 We override this method to support the C<trigger> attribute option.
190 =item B<construct_instance>
192 This provides some Moose specific extensions to this method, you
193 almost never call this method directly unless you really know what
196 This method makes sure to handle the moose weak-ref, type-constraint
197 and type coercion features.
199 =item B<has_method ($name)>
201 This accomidates Moose::Meta::Role::Method instances, which are
202 aliased, instead of added, but still need to be counted as valid
205 =item B<add_override_method_modifier ($name, $method)>
207 This will create an C<override> method modifier for you, and install
210 =item B<add_augment_method_modifier ($name, $method)>
212 This will create an C<augment> method modifier for you, and install
217 This will return an array of C<Moose::Meta::Role> instances which are
218 attached to this class.
220 =item B<add_role ($role)>
222 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
223 to the list of associated roles.
225 =item B<does_role ($role_name)>
227 This will test if this class C<does> a given C<$role_name>. It will
228 not only check it's local roles, but ask them as well in order to
229 cascade down the role hierarchy.
231 =item B<excludes_role ($role_name)>
233 This will test if this class C<excludes> a given C<$role_name>. It will
234 not only check it's local roles, but ask them as well in order to
235 cascade down the role hierarchy.
237 =item B<add_attribute $attr_name, %params>
239 This method does the same thing as L<Class::MOP::Class/add_attribute>, but adds
240 suport for delegation.
244 =head1 INTERNAL METHODS
248 =item compute_delegation
250 =item generate_delegation_list
252 =item generate_delgate_method
254 =item get_delegatable_methods
256 =item filter_delegations
262 All complex software has bugs lurking in it, and this module is no
263 exception. If you find a bug please either email me, or add the bug
268 Stevan Little E<lt>stevan@iinteractive.comE<gt>
270 =head1 COPYRIGHT AND LICENSE
272 Copyright 2006 by Infinity Interactive, Inc.
274 L<http://www.iinteractive.com>
276 This library is free software; you can redistribute it and/or modify
277 it under the same terms as Perl itself.