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[catagits/Gitalist.git] / local-lib5 / man / man3 / Moose::Meta::Role.3pm

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.\" ========================================================================
.\"
.IX Title "Moose::Meta::Role 3"
.TH Moose::Meta::Role 3 "2009-11-19" "perl v5.8.7" "User Contributed Perl Documentation"
.SH "NAME"
Moose::Meta::Role \- The Moose Role metaclass
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class is a subclass of Class::MOP::Module that provides
additional Moose-specific functionality.
.PP
It's \s-1API\s0 looks a lot like Moose::Meta::Class, but internally it
implements many things differently. This may change in the future.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
\&\f(CW\*(C`Moose::Meta::Role\*(C'\fR is a subclass of Class::MOP::Module.
.SH "METHODS"
.IX Header "METHODS"
.Sh "Construction"
.IX Subsection "Construction"
.IP "\fBMoose::Meta::Role\->initialize($role_name)\fR" 4
.IX Item "Moose::Meta::Role->initialize($role_name)"
This method creates a new role object with the provided name.
.ie n .IP "\fBMoose::Meta::Role\->combine( [ \fB$role\fB => { ... } ], [ \f(BI$role\fB ], ... )\fR" 4
.el .IP "\fBMoose::Meta::Role\->combine( [ \f(CB$role\fB => { ... } ], [ \f(CB$role\fB ], ... )\fR" 4
.IX Item "Moose::Meta::Role->combine( [ $role => { ... } ], [ $role ], ... )"
This method accepts a list of array references. Each array reference
should contain a role name as its first element. The second element is
an optional hash reference. The hash reference can contain \f(CW\*(C`\-excludes\*(C'\fR
and \f(CW\*(C`\-alias\*(C'\fR keys to control how methods are composed from the role.
.Sp
The return value is a new Moose::Meta::Role::Composite that
represents the combined roles.
.ie n .IP "\fBMoose::Meta::Role\->create($name, \fB%options\fB)\fR" 4
.el .IP "\fBMoose::Meta::Role\->create($name, \f(CB%options\fB)\fR" 4
.IX Item "Moose::Meta::Role->create($name, %options)"
This method is identical to the Moose::Meta::Class \f(CW\*(C`create\*(C'\fR
method.
.IP "\fBMoose::Meta::Role\->create_anon_role\fR" 4
.IX Item "Moose::Meta::Role->create_anon_role"
This method is identical to the Moose::Meta::Class
\&\f(CW\*(C`create_anon_class\*(C'\fR method.
.IP "\fB$metarole\->is_anon_role\fR" 4
.IX Item "$metarole->is_anon_role"
Returns true if the role is an anonymous role.
.Sh "Role application"
.IX Subsection "Role application"
.ie n .IP "\fB$metarole\->apply( \fB$thing\fB, \f(BI@options\fB )\fR" 4
.el .IP "\fB$metarole\->apply( \f(CB$thing\fB, \f(CB@options\fB )\fR" 4
.IX Item "$metarole->apply( $thing, @options )"
This method applies a role to the given \f(CW$thing\fR. That can be another
Moose::Meta::Role, object, a Moose::Meta::Class object, or a
(non\-meta) object instance.
.Sp
The options are passed directly to the constructor for the appropriate
Moose::Meta::Role::Application subclass.
.Sp
Note that this will apply the role even if the \f(CW$thing\fR in question already
\&\f(CW\*(C`does\*(C'\fR this role.  \*(L"does_role\*(R" in Moose::Util is a convenient wrapper for
finding out if role application is necessary.
.Sh "Roles and other roles"
.IX Subsection "Roles and other roles"
.IP "\fB$metarole\->get_roles\fR" 4
.IX Item "$metarole->get_roles"
This returns an array reference of roles which this role does. This
list may include duplicates.
.IP "\fB$metarole\->calculate_all_roles\fR" 4
.IX Item "$metarole->calculate_all_roles"
This returns a \fIunique\fR list of all roles that this role does, and
all the roles that its roles do.
.IP "\fB$metarole\->does_role($role_name)\fR" 4
.IX Item "$metarole->does_role($role_name)"
Given a role \fIname\fR, returns true if this role does the given
role.
.IP "\fB$metarole\->add_role($role)\fR" 4
.IX Item "$metarole->add_role($role)"
Given a Moose::Meta::Role object, this adds the role to the list of
roles that the role does.
.IP "\fB$metarole\->get_excluded_roles_list\fR" 4
.IX Item "$metarole->get_excluded_roles_list"
Returns a list of role names which this role excludes.
.IP "\fB$metarole\->excludes_role($role_name)\fR" 4
.IX Item "$metarole->excludes_role($role_name)"
Given a role \fIname\fR, returns true if this role excludes the named
role.
.IP "\fB$metarole\->add_excluded_roles(@role_names)\fR" 4
.IX Item "$metarole->add_excluded_roles(@role_names)"
Given one or more role names, adds those roles to the list of excluded
roles.
.Sh "Methods"
.IX Subsection "Methods"
The methods for dealing with a role's methods are all identical in \s-1API\s0
and behavior to the same methods in Class::MOP::Class.
.IP "\fB$metarole\->method_metaclass\fR" 4
.IX Item "$metarole->method_metaclass"
Returns the method metaclass name for the role. This defaults to
Moose::Meta::Role::Method.
.IP "\fB$metarole\->get_method($name)\fR" 4
.IX Item "$metarole->get_method($name)"
.PD 0
.IP "\fB$metarole\->has_method($name)\fR" 4
.IX Item "$metarole->has_method($name)"
.ie n .IP "\fB$metarole\->add_method( \fB$name\fB, \f(BI$body\fB )\fR" 4
.el .IP "\fB$metarole\->add_method( \f(CB$name\fB, \f(CB$body\fB )\fR" 4
.IX Item "$metarole->add_method( $name, $body )"
.IP "\fB$metarole\->get_method_list\fR" 4
.IX Item "$metarole->get_method_list"
.IP "\fB$metarole\->find_method_by_name($name)\fR" 4
.IX Item "$metarole->find_method_by_name($name)"
.PD
These methods are all identical to the methods of the same name in
Class::MOP::Package
.Sh "Attributes"
.IX Subsection "Attributes"
As with methods, the methods for dealing with a role's attribute are
all identical in \s-1API\s0 and behavior to the same methods in
Class::MOP::Class.
.PP
However, attributes stored in this class are \fInot\fR stored as
objects. Rather, the attribute definition is stored as a hash
reference. When a role is composed into a class, this hash reference
is passed directly to the metaclass's \f(CW\*(C`add_attribute\*(C'\fR method.
.PP
This is quite likely to change in the future.
.IP "\fB$metarole\->get_attribute($attribute_name)\fR" 4
.IX Item "$metarole->get_attribute($attribute_name)"
.PD 0
.IP "\fB$metarole\->has_attribute($attribute_name)\fR" 4
.IX Item "$metarole->has_attribute($attribute_name)"
.IP "\fB$metarole\->get_attribute_list\fR" 4
.IX Item "$metarole->get_attribute_list"
.ie n .IP "\fB$metarole\->add_attribute($name, \fB%options\fB)\fR" 4
.el .IP "\fB$metarole\->add_attribute($name, \f(CB%options\fB)\fR" 4
.IX Item "$metarole->add_attribute($name, %options)"
.IP "\fB$metarole\->remove_attribute($attribute_name)\fR" 4
.IX Item "$metarole->remove_attribute($attribute_name)"
.PD
.Sh "Required methods"
.IX Subsection "Required methods"
.IP "\fB$metarole\->get_required_method_list\fR" 4
.IX Item "$metarole->get_required_method_list"
Returns the list of methods required by the role.
.IP "\fB$metarole\->requires_method($name)\fR" 4
.IX Item "$metarole->requires_method($name)"
Returns true if the role requires the named method.
.IP "\fB$metarole\->add_required_methods(@names)\fR" 4
.IX Item "$metarole->add_required_methods(@names)"
Adds the named methods to the role's list of required methods.
.IP "\fB$metarole\->remove_required_methods(@names)\fR" 4
.IX Item "$metarole->remove_required_methods(@names)"
Removes the named methods from the role's list of required methods.
.IP "\fB$metarole\->add_conflicting_method(%params)\fR" 4
.IX Item "$metarole->add_conflicting_method(%params)"
Instantiate the parameters as a Moose::Meta::Role::Method::Conflicting
object, then add it to the required method list.
.Sh "Method modifiers"
.IX Subsection "Method modifiers"
These methods act like their counterparts in Class::Mop::Class and
Moose::Meta::Class.
.PP
However, method modifiers are simply stored internally, and are not
applied until the role itself is applied to a class.
.ie n .IP "\fB$metarole\->add_after_method_modifier($method_name, \fB$method\fB)\fR" 4
.el .IP "\fB$metarole\->add_after_method_modifier($method_name, \f(CB$method\fB)\fR" 4
.IX Item "$metarole->add_after_method_modifier($method_name, $method)"
.PD 0
.ie n .IP "\fB$metarole\->add_around_method_modifier($method_name, \fB$method\fB)\fR" 4
.el .IP "\fB$metarole\->add_around_method_modifier($method_name, \f(CB$method\fB)\fR" 4
.IX Item "$metarole->add_around_method_modifier($method_name, $method)"
.ie n .IP "\fB$metarole\->add_before_method_modifier($method_name, \fB$method\fB)\fR" 4
.el .IP "\fB$metarole\->add_before_method_modifier($method_name, \f(CB$method\fB)\fR" 4
.IX Item "$metarole->add_before_method_modifier($method_name, $method)"
.ie n .IP "\fB$metarole\->add_override_method_modifier($method_name, \fB$method\fB)\fR" 4
.el .IP "\fB$metarole\->add_override_method_modifier($method_name, \f(CB$method\fB)\fR" 4
.IX Item "$metarole->add_override_method_modifier($method_name, $method)"
.PD
These methods all add an appropriate modifier to the internal list of
modifiers.
.IP "\fB$metarole\->has_after_method_modifiers\fR" 4
.IX Item "$metarole->has_after_method_modifiers"
.PD 0
.IP "\fB$metarole\->has_around_method_modifiers\fR" 4
.IX Item "$metarole->has_around_method_modifiers"
.IP "\fB$metarole\->has_before_method_modifiers\fR" 4
.IX Item "$metarole->has_before_method_modifiers"
.IP "\fB$metarole\->has_override_method_modifier\fR" 4
.IX Item "$metarole->has_override_method_modifier"
.PD
Return true if the role has any modifiers of the given type.
.IP "\fB$metarole\->get_after_method_modifiers($method_name)\fR" 4
.IX Item "$metarole->get_after_method_modifiers($method_name)"
.PD 0
.IP "\fB$metarole\->get_around_method_modifiers($method_name)\fR" 4
.IX Item "$metarole->get_around_method_modifiers($method_name)"
.IP "\fB$metarole\->get_before_method_modifiers($method_name)\fR" 4
.IX Item "$metarole->get_before_method_modifiers($method_name)"
.PD
Given a method name, returns a list of the appropriate modifiers for
that method.
.IP "\fB$metarole\->get_override_method_modifier($method_name)\fR" 4
.IX Item "$metarole->get_override_method_modifier($method_name)"
Given a method name, returns the override method modifier for that
method, if it has one.
.Sh "Introspection"
.IX Subsection "Introspection"
.IP "\fBMoose::Meta::Role\->meta\fR" 4
.IX Item "Moose::Meta::Role->meta"
This will return a Class::MOP::Class instance for this class.
.SH "BUGS"
.IX Header "BUGS"
All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan\-RT.
.SH "AUTHOR"
.IX Header "AUTHOR"
Stevan Little <stevan@iinteractive.com>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2006\-2009 by Infinity Interactive, Inc.
.PP
<http://www.iinteractive.com>
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.