1 package Moose::Meta::Role::Composite;
7 use Scalar::Util 'blessed';
10 $VERSION = eval $VERSION;
11 our $AUTHORITY = 'cpan:STEVAN';
13 use base 'Moose::Meta::Role';
16 # we need to override the ->name
17 # method from Class::MOP::Package
18 # since we don't have an actual
21 __PACKAGE__->meta->add_attribute('name' => (reader => 'name'));
24 # Again, since we don't have a real
25 # package to store our methods in,
26 # we use a HASH ref instead.
28 __PACKAGE__->meta->add_attribute('_methods' => (
29 reader => '_method_map',
33 __PACKAGE__->meta->add_attribute(
34 'application_role_summation_class',
35 reader => 'application_role_summation_class',
36 default => 'Moose::Meta::Role::Application::RoleSummation',
40 my ($class, %params) = @_;
42 # the roles param is required ...
43 foreach ( @{$params{roles}} ) {
44 unless ( $_->isa('Moose::Meta::Role') ) {
46 Moose->throw_error("The list of roles must be instances of Moose::Meta::Role, not $_");
50 my @composition_roles = map {
51 $_->composition_class_roles
52 } @{ $params{roles} };
54 if (@composition_roles) {
55 my $meta = Moose::Meta::Class->create_anon_class(
56 superclasses => [ $class ],
57 roles => [ @composition_roles ],
60 $meta->add_method(meta => sub { $meta });
64 # and the name is created from the
65 # roles if one has not been provided
66 $params{name} ||= (join "|" => map { $_->name } @{$params{roles}});
67 $class->_new(\%params);
70 # This is largely a cope of what's in Moose::Meta::Role (itself
71 # largely a copy of Class::MOP::Class). However, we can't actually
72 # call add_package_symbol, because there's no package to which which
75 my ($self, $method_name, $method) = @_;
77 unless ( defined $method_name && $method_name ) {
78 Moose->throw_error("You must define a method name");
82 if (blessed($method)) {
83 $body = $method->body;
84 if ($method->package_name ne $self->name) {
85 $method = $method->clone(
86 package_name => $self->name,
88 ) if $method->can('clone');
93 $method = $self->wrap_method_body( body => $body, name => $method_name );
96 $self->_method_map->{$method_name} = $method;
101 return keys %{ $self->_method_map };
105 my ($self, $method_name) = @_;
107 return exists $self->_method_map->{$method_name};
111 my ($self, $method_name) = @_;
113 return $self->_method_map->{$method_name};
117 my ($self, $role_params) = @_;
118 Class::MOP::load_class($self->application_role_summation_class);
120 $self->application_role_summation_class->new(
121 role_params => $role_params,
128 my ( $class, $old_meta, @args ) = @_;
131 'Moose::Meta::Role::Composite instances can only be reinitialized from an existing metaclass instance'
133 if !blessed $old_meta
134 || !$old_meta->isa('Moose::Meta::Role::Composite');
136 my %existing_classes = map { $_ => $old_meta->$_() } qw(
137 application_role_summation_class
140 return $old_meta->meta->clone_object( $old_meta, %existing_classes, @args );
151 Moose::Meta::Role::Composite - An object to represent the set of roles
155 A composite is a role that consists of a set of two or more roles.
157 The API of a composite role is almost identical to that of a regular
162 C<Moose::Meta::Role::Composite> is a subclass of L<Moose::Meta::Role>.
168 =item B<< Moose::Meta::Role::Composite->new(%options) >>
170 This returns a new composite role object. It accepts the same
171 options as its parent class, with a few changes:
177 This option is an array reference containing a list of
178 L<Moose::Meta::Role> object. This is a required option.
182 If a name is not given, one is generated from the roles provided.
184 =item * apply_params(\%role_params)
186 Creates a new RoleSummation role application with C<%role_params> and applies
187 the composite role to it. The RoleSummation role application class used is
188 determined by the composite role's C<application_role_summation_class>
191 =item * reinitialize($metaclass)
193 Like C<< Class::MOP::Package->reinitialize >>, but doesn't allow passing a
194 string with the package name, as there is no real package for composite roles.
202 See L<Moose/BUGS> for details on reporting bugs.
206 Stevan Little E<lt>stevan@iinteractive.comE<gt>
208 =head1 COPYRIGHT AND LICENSE
210 Copyright 2006-2010 by Infinity Interactive, Inc.
212 L<http://www.iinteractive.com>
214 This library is free software; you can redistribute it and/or modify
215 it under the same terms as Perl itself.