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 $class ($self->class_precedence_list) {
42 foreach my $role (@{$class->meta->roles}) {
43 return 1 if $role->does_role($role_name);
50 my ($self, $role_name) = @_;
52 || confess "You must supply a role name to look for";
53 foreach my $class ($self->class_precedence_list) {
54 foreach my $role (@{$class->meta->roles}) {
55 return 1 if $role->excludes_role($role_name);
62 my ($class, %params) = @_;
63 my $self = $class->SUPER::new_object(%params);
64 foreach my $attr ($class->compute_all_applicable_attributes()) {
65 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
66 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
71 sub construct_instance {
72 my ($class, %params) = @_;
73 my $meta_instance = $class->get_meta_instance;
75 # the code below is almost certainly incorrect
76 # but this is foreign inheritence, so we might
77 # have to kludge it in the end.
78 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
79 foreach my $attr ($class->compute_all_applicable_attributes()) {
80 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
86 my ($self, $method_name) = @_;
87 (defined $method_name && $method_name)
88 || confess "You must define a method name";
90 my $sub_name = ($self->name . '::' . $method_name);
93 return 0 if !defined(&{$sub_name});
94 my $method = \&{$sub_name};
96 return 1 if blessed($method) && $method->isa('Moose::Meta::Role::Method');
97 return $self->SUPER::has_method($method_name);
100 sub add_override_method_modifier {
101 my ($self, $name, $method, $_super_package) = @_;
102 (!$self->has_method($name))
103 || confess "Cannot add an override method if a local method is already present";
104 # need this for roles ...
105 $_super_package ||= $self->name;
106 my $super = $self->find_next_method_by_name($name);
108 || confess "You cannot override '$name' because it has no super method";
109 $self->add_method($name => bless sub {
112 no warnings 'redefine';
113 local *{$_super_package . '::super'} = sub { $super->(@args) };
114 return $method->(@args);
115 } => 'Moose::Meta::Method::Overriden');
118 sub add_augment_method_modifier {
119 my ($self, $name, $method) = @_;
120 (!$self->has_method($name))
121 || confess "Cannot add an augment method if a local method is already present";
122 my $super = $self->find_next_method_by_name($name);
124 || confess "You cannot augment '$name' because it has no super method";
125 my $_super_package = $super->package_name;
126 # BUT!,... if this is an overriden method ....
127 if ($super->isa('Moose::Meta::Method::Overriden')) {
128 # we need to be sure that we actually
129 # find the next method, which is not
130 # an 'override' method, the reason is
131 # that an 'override' method will not
132 # be the one calling inner()
133 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
134 $_super_package = $real_super->package_name;
136 $self->add_method($name => sub {
139 no warnings 'redefine';
140 local *{$_super_package . '::inner'} = sub { $method->(@args) };
141 return $super->(@args);
145 sub _find_next_method_by_name_which_is_not_overridden {
146 my ($self, $name) = @_;
147 my @methods = $self->find_all_methods_by_name($name);
148 foreach my $method (@methods) {
149 return $method->{code}
150 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
155 package Moose::Meta::Method::Overriden;
160 our $VERSION = '0.01';
162 use base 'Class::MOP::Method';
172 Moose::Meta::Class - The Moose metaclass
176 This is a subclass of L<Class::MOP::Class> with Moose specific
179 For the most part, the only time you will ever encounter an
180 instance of this class is if you are doing some serious deep
181 introspection. To really understand this class, you need to refer
182 to the L<Class::MOP::Class> documentation.
192 We override this method to support the C<trigger> attribute option.
194 =item B<construct_instance>
196 This provides some Moose specific extensions to this method, you
197 almost never call this method directly unless you really know what
200 This method makes sure to handle the moose weak-ref, type-constraint
201 and type coercion features.
203 =item B<has_method ($name)>
205 This accomidates Moose::Meta::Role::Method instances, which are
206 aliased, instead of added, but still need to be counted as valid
209 =item B<add_override_method_modifier ($name, $method)>
211 This will create an C<override> method modifier for you, and install
214 =item B<add_augment_method_modifier ($name, $method)>
216 This will create an C<augment> method modifier for you, and install
221 This will return an array of C<Moose::Meta::Role> instances which are
222 attached to this class.
224 =item B<add_role ($role)>
226 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
227 to the list of associated roles.
229 =item B<does_role ($role_name)>
231 This will test if this class C<does> a given C<$role_name>. It will
232 not only check it's local roles, but ask them as well in order to
233 cascade down the role hierarchy.
235 =item B<excludes_role ($role_name)>
237 This will test if this class C<excludes> a given C<$role_name>. It will
238 not only check it's local roles, but ask them as well in order to
239 cascade down the role hierarchy.
241 =item B<add_attribute $attr_name, %params>
243 This method does the same thing as L<Class::MOP::Class/add_attribute>, but adds
244 suport for delegation.
248 =head1 INTERNAL METHODS
252 =item compute_delegation
254 =item generate_delegation_list
256 =item generate_delgate_method
258 =item get_delegatable_methods
260 =item filter_delegations
266 All complex software has bugs lurking in it, and this module is no
267 exception. If you find a bug please either email me, or add the bug
272 Stevan Little E<lt>stevan@iinteractive.comE<gt>
274 =head1 COPYRIGHT AND LICENSE
276 Copyright 2006 by Infinity Interactive, Inc.
278 L<http://www.iinteractive.com>
280 This library is free software; you can redistribute it and/or modify
281 it under the same terms as Perl itself.