1 package Moose::Meta::TypeConstraint::Role;
7 use Scalar::Util 'blessed';
8 use Moose::Util::TypeConstraints ();
10 our $AUTHORITY = 'cpan:STEVAN';
12 use base 'Moose::Meta::TypeConstraint';
14 __PACKAGE__->meta->add_attribute('role' => (
19 my ( $class, %args ) = @_;
21 $args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Object');
22 my $self = $class->_new(\%args);
24 $self->_create_hand_optimized_type_constraint;
25 $self->compile_type_constraint();
30 sub _create_hand_optimized_type_constraint {
32 my $role = $self->role;
33 $self->hand_optimized_type_constraint(
34 sub { Moose::Util::does_role($_[0], $role) }
43 # FIXME find_type_constraint might find a TC named after the role but that isn't really it
44 # I did this anyway since it's a convention that preceded TypeConstraint::Role, and it should DWIM
45 # if anybody thinks this problematic please discuss on IRC.
46 # a possible fix is to add by attr indexing to the type registry to find types of a certain property
47 # regardless of their name
48 Moose::Util::TypeConstraints::find_type_constraint($_)
50 __PACKAGE__->new( role => $_, name => "__ANON__" )
51 } @{ Class::MOP::class_of($self->role)->get_roles },
56 my ( $self, $type_or_name ) = @_;
58 my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
60 return unless defined $other;
61 return unless $other->isa(__PACKAGE__);
63 return $self->role eq $other->role;
67 my ($self, $type_or_name) = @_;
69 my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
71 ($self->equals($type) || $self->is_subtype_of($type_or_name));
75 my ($self, $type_or_name_or_role ) = @_;
77 if ( not ref $type_or_name_or_role ) {
79 return 1 if Class::MOP::class_of($self->role)->does_role( $type_or_name_or_role );
82 my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_role);
84 return unless defined $type;
86 if ( $type->isa(__PACKAGE__) ) {
87 # if $type_or_name_or_role isn't a role, it might be the TC name of another ::Role type
88 # or it could also just be a type object in this branch
89 return Class::MOP::class_of($self->role)->does_role( $type->role );
91 # the only other thing we are a subtype of is Object
92 $self->SUPER::is_subtype_of($type);
96 sub create_child_type {
97 my ($self, @args) = @_;
98 return Moose::Meta::TypeConstraint->new(@args, parent => $self);
103 # ABSTRACT: Role/TypeConstraint parallel hierarchy
111 This class represents type constraints for a role.
115 C<Moose::Meta::TypeConstraint::Role> is a subclass of
116 L<Moose::Meta::TypeConstraint>.
122 =item B<< Moose::Meta::TypeConstraint::Role->new(%options) >>
124 This creates a new role type constraint based on the given
127 It takes the same options as its parent, with two exceptions. First,
128 it requires an additional option, C<role>, which is name of the
129 constraint's role. Second, it automatically sets the parent to the
132 The constructor also overrides the hand optimized type constraint with
133 one it creates internally.
135 =item B<< $constraint->role >>
137 Returns the role name associated with the constraint.
139 =item B<< $constraint->parents >>
141 Returns all the type's parent types, corresponding to the roles that
144 =item B<< $constraint->is_subtype_of($type_name_or_object) >>
146 If the given type is also a role type, then this checks that the
147 type's role does the other type's role.
149 Otherwise it falls back to the implementation in
150 L<Moose::Meta::TypeConstraint>.
152 =item B<< $constraint->create_child_type(%options) >>
154 This returns a new L<Moose::Meta::TypeConstraint> object with the type
157 Note that it does I<not> return a C<Moose::Meta::TypeConstraint::Role>
164 See L<Moose/BUGS> for details on reporting bugs.