NAME
Moose::Meta::Role - The Moose Role metaclass
VERSION
version 2.2012
DESCRIPTION
This class is a subclass of Class::MOP::Module that provides additional Moose-specific functionality.
Its API looks a lot like Moose::Meta::Class, but internally it implements many things differently. This may change in the future.
INHERITANCE
Moose::Meta::Role is a subclass of Class::MOP::Module.
METHODS
Construction
Moose::Meta::Role->initialize($role_name)
This method creates a new role object with the provided name.
Moose::Meta::Role->combine( [ $role => { ... } ], [ $role ], ... )
This method accepts a list of array references. Each array reference should contain a role name or Moose::Meta::Role object as its first element. The second element is an optional hash reference. The hash reference can contain -excludes and -alias keys to control how methods are composed from the role.
The return value is a new Moose::Meta::Role::Composite that represents the combined roles.
$metarole->composition_class_roles
When combining multiple roles using combine, this method is used to obtain a list of role names to be applied to the Moose::Meta::Role::Composite instance returned by combine. The default implementation returns an empty list. Extensions that need to hook into role combination may wrap this method to return additional role names.
Moose::Meta::Role->create($name, %options)
This method is identical to the Moose::Meta::Class create method.
Moose::Meta::Role->create_anon_role
This method is identical to the Moose::Meta::Class create_anon_class method.
$metarole->is_anon_role
Returns true if the role is an anonymous role.
$metarole->consumers
Returns a list of names of classes and roles which consume this role.
Role application
$metarole->apply( $thing, @options )
This method applies a role to the given $thing. That can be another Moose::Meta::Role, object, a Moose::Meta::Class object, or a (non-meta) object instance.
The options are passed directly to the constructor for the appropriate Moose::Meta::Role::Application subclass.
Note that this will apply the role even if the $thing in question already does this role. "does_role" in Moose::Util is a convenient wrapper for finding out if role application is necessary.
Roles and other roles
$metarole->get_roles
This returns an array reference of roles which this role does. This list may include duplicates.
$metarole->calculate_all_roles
This returns a unique list of all roles that this role does, and all the roles that its roles do.
$metarole->does_role($role)
Given a role name or Moose::Meta::Role object, returns true if this role does the given role.
$metarole->add_role($role)
Given a Moose::Meta::Role object, this adds the role to the list of roles that the role does.
$metarole->get_excluded_roles_list
Returns a list of role names which this role excludes.
$metarole->excludes_role($role_name)
Given a role name, returns true if this role excludes the named role.
$metarole->add_excluded_roles(@role_names)
Given one or more role names, adds those roles to the list of excluded roles.
Methods
The methods for dealing with a role's methods are all identical in API and behavior to the same methods in Class::MOP::Class.
$metarole->method_metaclass
Returns the method metaclass name for the role. This defaults to Moose::Meta::Role::Method.
$metarole->get_method($name)
$metarole->has_method($name)
$metarole->add_method( $name, $body )
$metarole->get_method_list
$metarole->find_method_by_name($name)
These methods are all identical to the methods of the same name in Class::MOP::Package
Attributes
As with methods, the methods for dealing with a role's attribute are all identical in API and behavior to the same methods in Class::MOP::Class.
However, attributes stored in this class are not stored as objects. Rather, the attribute definition is stored as a hash reference. When a role is composed into a class, this hash reference is passed directly to the metaclass's add_attribute method.
This is quite likely to change in the future.
$metarole->get_attribute($attribute_name)
$metarole->has_attribute($attribute_name)
$metarole->get_attribute_list
$metarole->add_attribute($name, %options)
$metarole->remove_attribute($attribute_name)
Overload introspection and creation
The methods for dealing with a role's overloads are all identical in API and behavior to the same methods in Class::MOP::Class.
$metarole->is_overloaded
$metarole->get_overloaded_operator($op)
$metarole->has_overloaded_operator($op)
$metarole->get_overload_list
$metarole->get_all_overloaded_operators
$metarole->add_overloaded_operator($op, $impl)
$metarole->remove_overloaded_operator($op)
Required methods
$metarole->get_required_method_list
Returns the list of methods required by the role.
$metarole->requires_method($name)
Returns true if the role requires the named method.
$metarole->add_required_methods(@names)
Adds the named methods to the role's list of required methods.
$metarole->remove_required_methods(@names)
Removes the named methods from the role's list of required methods.
$metarole->add_conflicting_method(%params)
Instantiate the parameters as a Moose::Meta::Role::Method::Conflicting object, then add it to the required method list.
Method modifiers
These methods act like their counterparts in Class::MOP::Class and Moose::Meta::Class.
However, method modifiers are simply stored internally, and are not applied until the role itself is applied to a class or object.
$metarole->add_after_method_modifier($method_name, $method)
$metarole->add_around_method_modifier($method_name, $method)
$metarole->add_before_method_modifier($method_name, $method)
$metarole->add_override_method_modifier($method_name, $method)
These methods all add an appropriate modifier to the internal list of modifiers.
$metarole->has_after_method_modifiers
$metarole->has_around_method_modifiers
$metarole->has_before_method_modifiers
$metarole->has_override_method_modifier
Return true if the role has any modifiers of the given type.
$metarole->get_after_method_modifiers($method_name)
$metarole->get_around_method_modifiers($method_name)
$metarole->get_before_method_modifiers($method_name)
Given a method name, returns a list of the appropriate modifiers for that method.
$metarole->get_override_method_modifier($method_name)
Given a method name, returns the override method modifier for that method, if it has one.
Introspection
Moose::Meta::Role->meta
This will return a Class::MOP::Class instance for this class.
BUGS
See "BUGS" in Moose for details on reporting bugs.
AUTHORS
Stevan Little <stevan.little@iinteractive.com>
Dave Rolsky <autarch@urth.org>
Jesse Luehrs <doy@tozt.net>
Shawn M Moore <code@sartak.org>
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
Karen Etheridge <ether@cpan.org>
Florian Ragwitz <rafl@debian.org>
Hans Dieter Pearcey <hdp@weftsoar.net>
Chris Prather <chris@prather.org>
Matt S Trout <mst@shadowcat.co.uk>
COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by Infinity Interactive, Inc.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.