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 ($class, %params) = @_;
49 my $self = $class->SUPER::new_object(%params);
50 foreach my $attr ($class->compute_all_applicable_attributes()) {
51 next unless $params{$attr->init_arg} && $attr->can('has_trigger') && $attr->has_trigger;
52 $attr->trigger->($self, $params{$attr->init_arg}, $attr);
57 sub construct_instance {
58 my ($class, %params) = @_;
59 my $meta_instance = $class->get_meta_instance;
61 # the code below is almost certainly incorrect
62 # but this is foreign inheritence, so we might
63 # have to kludge it in the end.
64 my $instance = $params{'__INSTANCE__'} || $meta_instance->create_instance();
65 foreach my $attr ($class->compute_all_applicable_attributes()) {
66 $attr->initialize_instance_slot($meta_instance, $instance, \%params)
72 my ($self, $method_name) = @_;
73 (defined $method_name && $method_name)
74 || confess "You must define a method name";
76 my $sub_name = ($self->name . '::' . $method_name);
79 return 0 if !defined(&{$sub_name});
80 my $method = \&{$sub_name};
82 return 1 if blessed($method) && $method->isa('Moose::Meta::Role::Method');
83 return $self->SUPER::has_method($method_name);
86 sub add_override_method_modifier {
87 my ($self, $name, $method, $_super_package) = @_;
88 (!$self->has_method($name))
89 || confess "Cannot add an override method if a local method is already present";
90 # need this for roles ...
91 $_super_package ||= $self->name;
92 my $super = $self->find_next_method_by_name($name);
94 || confess "You cannot override '$name' because it has no super method";
95 $self->add_method($name => bless sub {
98 no warnings 'redefine';
99 local *{$_super_package . '::super'} = sub { $super->(@args) };
100 return $method->(@args);
101 } => 'Moose::Meta::Method::Overriden');
104 sub add_augment_method_modifier {
105 my ($self, $name, $method) = @_;
106 (!$self->has_method($name))
107 || confess "Cannot add an augment method if a local method is already present";
108 my $super = $self->find_next_method_by_name($name);
110 || confess "You cannot augment '$name' because it has no super method";
111 my $_super_package = $super->package_name;
112 # BUT!,... if this is an overriden method ....
113 if ($super->isa('Moose::Meta::Method::Overriden')) {
114 # we need to be sure that we actually
115 # find the next method, which is not
116 # an 'override' method, the reason is
117 # that an 'override' method will not
118 # be the one calling inner()
119 my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name);
120 $_super_package = $real_super->package_name;
122 $self->add_method($name => sub {
125 no warnings 'redefine';
126 local *{$_super_package . '::inner'} = sub { $method->(@args) };
127 return $super->(@args);
131 sub _find_next_method_by_name_which_is_not_overridden {
132 my ($self, $name) = @_;
133 my @methods = $self->find_all_methods_by_name($name);
134 foreach my $method (@methods) {
135 return $method->{code}
136 if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden');
141 package Moose::Meta::Method::Overriden;
146 our $VERSION = '0.01';
148 use base 'Class::MOP::Method';
158 Moose::Meta::Class - The Moose metaclass
162 This is a subclass of L<Class::MOP::Class> with Moose specific
165 For the most part, the only time you will ever encounter an
166 instance of this class is if you are doing some serious deep
167 introspection. To really understand this class, you need to refer
168 to the L<Class::MOP::Class> documentation.
178 We override this method to support the C<trigger> attribute option.
180 =item B<construct_instance>
182 This provides some Moose specific extensions to this method, you
183 almost never call this method directly unless you really know what
186 This method makes sure to handle the moose weak-ref, type-constraint
187 and type coercion features.
189 =item B<has_method ($name)>
191 This accomidates Moose::Meta::Role::Method instances, which are
192 aliased, instead of added, but still need to be counted as valid
195 =item B<add_override_method_modifier ($name, $method)>
197 This will create an C<override> method modifier for you, and install
200 =item B<add_augment_method_modifier ($name, $method)>
202 This will create an C<augment> method modifier for you, and install
207 This will return an array of C<Moose::Meta::Role> instances which are
208 attached to this class.
210 =item B<add_role ($role)>
212 This takes an instance of C<Moose::Meta::Role> in C<$role>, and adds it
213 to the list of associated roles.
215 =item B<does_role ($role_name)>
217 This will test if this class C<does> a given C<$role_name>. It will
218 not only check it's local roles, but ask them as well in order to
219 cascade down the role hierarchy.
221 =item B<add_attribute $attr_name, %params>
223 This method does the same thing as L<Class::MOP::Class/add_attribute>, but adds
224 suport for delegation.
228 =head1 INTERNAL METHODS
232 =item compute_delegation
234 =item generate_delegation_list
236 =item generate_delgate_method
238 =item get_delegatable_methods
240 =item filter_delegations
246 All complex software has bugs lurking in it, and this module is no
247 exception. If you find a bug please either email me, or add the bug
252 Stevan Little E<lt>stevan@iinteractive.comE<gt>
254 =head1 COPYRIGHT AND LICENSE
256 Copyright 2006 by Infinity Interactive, Inc.
258 L<http://www.iinteractive.com>
260 This library is free software; you can redistribute it and/or modify
261 it under the same terms as Perl itself.