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Diffstat (limited to 'lib/Moose/Meta/Role.pm')
| -rw-r--r-- | lib/Moose/Meta/Role.pm | 1095 |
1 files changed, 1095 insertions, 0 deletions
diff --git a/lib/Moose/Meta/Role.pm b/lib/Moose/Meta/Role.pm new file mode 100644 index 0000000..fbd8c1e --- /dev/null +++ b/lib/Moose/Meta/Role.pm @@ -0,0 +1,1095 @@ +package Moose::Meta::Role; +our $VERSION = '2.1405'; + +use strict; +use warnings; +use metaclass; + +use Scalar::Util 'blessed'; + +use Moose::Meta::Class; +use Moose::Meta::Role::Attribute; +use Moose::Meta::Role::Method; +use Moose::Meta::Role::Method::Required; +use Moose::Meta::Role::Method::Conflicting; +use Moose::Meta::Method::Meta; +use Moose::Util qw/throw_exception/; +use Class::MOP::MiniTrait; + +use parent 'Class::MOP::Module', + 'Class::MOP::Mixin::HasAttributes', + 'Class::MOP::Mixin::HasMethods', + 'Class::MOP::Mixin::HasOverloads'; + +Class::MOP::MiniTrait::apply(__PACKAGE__, 'Moose::Meta::Object::Trait'); + +## ------------------------------------------------------------------ +## NOTE: +## I normally don't do this, but I am doing +## a whole bunch of meta-programmin' in this +## module, so it just makes sense. For a clearer +## picture of what is going on in the next +## several lines of code, look at the really +## big comment at the end of this file (right +## before the POD). +## - SL +## ------------------------------------------------------------------ + +my $META = __PACKAGE__->meta; + +## ------------------------------------------------------------------ +## attributes ... + +# NOTE: +# since roles are lazy, we hold all the attributes +# of the individual role in 'stasis' until which +# time when it is applied to a class. This means +# keeping a lot of things in hash maps, so we are +# using a little of that meta-programmin' magic +# here and saving lots of extra typin'. And since +# many of these attributes above require similar +# functionality to support them, so we again use +# the wonders of meta-programmin' to deliver a +# very compact solution to this normally verbose +# problem. +# - SL + +foreach my $action ( + { + name => 'excluded_roles_map', + attr_reader => 'get_excluded_roles_map' , + methods => { + add => 'add_excluded_roles', + get_keys => 'get_excluded_roles_list', + existence => 'excludes_role', + } + }, + { + name => 'required_methods', + attr_reader => 'get_required_methods_map', + methods => { + remove => 'remove_required_methods', + get_values => 'get_required_method_list', + existence => 'requires_method', + } + }, +) { + + my $attr_reader = $action->{attr_reader}; + my $methods = $action->{methods}; + + # create the attribute + $META->add_attribute($action->{name} => ( + reader => $attr_reader, + default => sub { {} }, + Class::MOP::_definition_context(), + )); + + # create some helper methods + $META->add_method($methods->{add} => sub { + my ($self, @values) = @_; + $self->$attr_reader->{$_} = undef foreach @values; + }) if exists $methods->{add}; + + $META->add_method($methods->{get_keys} => sub { + my ($self) = @_; + keys %{$self->$attr_reader}; + }) if exists $methods->{get_keys}; + + $META->add_method($methods->{get_values} => sub { + my ($self) = @_; + values %{$self->$attr_reader}; + }) if exists $methods->{get_values}; + + $META->add_method($methods->{get} => sub { + my ($self, $name) = @_; + $self->$attr_reader->{$name} + }) if exists $methods->{get}; + + $META->add_method($methods->{existence} => sub { + my ($self, $name) = @_; + exists $self->$attr_reader->{$name} ? 1 : 0; + }) if exists $methods->{existence}; + + $META->add_method($methods->{remove} => sub { + my ($self, @values) = @_; + delete $self->$attr_reader->{$_} foreach @values; + }) if exists $methods->{remove}; +} + +$META->add_attribute( + 'method_metaclass', + reader => 'method_metaclass', + default => 'Moose::Meta::Role::Method', + Class::MOP::_definition_context(), +); + +$META->add_attribute( + 'required_method_metaclass', + reader => 'required_method_metaclass', + default => 'Moose::Meta::Role::Method::Required', + Class::MOP::_definition_context(), +); + +$META->add_attribute( + 'conflicting_method_metaclass', + reader => 'conflicting_method_metaclass', + default => 'Moose::Meta::Role::Method::Conflicting', + Class::MOP::_definition_context(), +); + +$META->add_attribute( + 'application_to_class_class', + reader => 'application_to_class_class', + default => 'Moose::Meta::Role::Application::ToClass', + Class::MOP::_definition_context(), +); + +$META->add_attribute( + 'application_to_role_class', + reader => 'application_to_role_class', + default => 'Moose::Meta::Role::Application::ToRole', + Class::MOP::_definition_context(), +); + +$META->add_attribute( + 'application_to_instance_class', + reader => 'application_to_instance_class', + default => 'Moose::Meta::Role::Application::ToInstance', + Class::MOP::_definition_context(), +); + +$META->add_attribute( + 'applied_attribute_metaclass', + reader => 'applied_attribute_metaclass', + default => 'Moose::Meta::Attribute', + Class::MOP::_definition_context(), +); + +# More or less copied from Moose::Meta::Class +sub initialize { + my $class = shift; + my @args = @_; + unshift @args, 'package' if @args % 2; + my %opts = @args; + my $package = delete $opts{package}; + return Class::MOP::get_metaclass_by_name($package) + || $class->SUPER::initialize($package, + 'attribute_metaclass' => 'Moose::Meta::Role::Attribute', + %opts, + ); +} + +sub reinitialize { + my $self = shift; + my $pkg = shift; + + my $meta = blessed $pkg ? $pkg : Class::MOP::class_of($pkg); + + my %existing_classes; + if ($meta) { + %existing_classes = map { $_ => $meta->$_() } qw( + attribute_metaclass + method_metaclass + wrapped_method_metaclass + required_method_metaclass + conflicting_method_metaclass + application_to_class_class + application_to_role_class + application_to_instance_class + applied_attribute_metaclass + ); + } + + my %options = @_; + $options{weaken} = Class::MOP::metaclass_is_weak($meta->name) + if !exists $options{weaken} + && blessed($meta) + && $meta->isa('Moose::Meta::Role'); + + # don't need to remove generated metaobjects here yet, since we don't + # yet generate anything in roles. this may change in the future though... + # keep an eye on that + my $new_meta = $self->SUPER::reinitialize( + $pkg, + %existing_classes, + %options, + ); + $new_meta->_restore_metaobjects_from($meta) + if $meta && $meta->isa('Moose::Meta::Role'); + return $new_meta; +} + +sub _restore_metaobjects_from { + my $self = shift; + my ($old_meta) = @_; + + $self->_restore_metamethods_from($old_meta); + $self->_restore_metaattributes_from($old_meta); + + for my $role ( @{ $old_meta->get_roles } ) { + $self->add_role($role); + } +} + +sub add_attribute { + my $self = shift; + + if (blessed $_[0] && ! $_[0]->isa('Moose::Meta::Role::Attribute') ) { + my $class = ref $_[0]; + throw_exception( CannotAddAsAnAttributeToARole => role_name => $self->name, + attribute_class => $class, + ); + } + elsif (!blessed($_[0]) && defined($_[0]) && $_[0] =~ /^\+(.*)/) { + throw_exception( AttributeExtensionIsNotSupportedInRoles => attribute_name => $_[0], + role_name => $self->name, + ); + } + + return $self->SUPER::add_attribute(@_); +} + +sub _attach_attribute { + my ( $self, $attribute ) = @_; + + $attribute->attach_to_role($self); +} + +sub add_required_methods { + my $self = shift; + + for (@_) { + my $method = $_; + if (!blessed($method)) { + $method = $self->required_method_metaclass->new( + name => $method, + ); + } + $self->get_required_methods_map->{$method->name} = $method; + } +} + +sub add_conflicting_method { + my $self = shift; + + my $method; + if (@_ == 1 && blessed($_[0])) { + $method = shift; + } + else { + $method = $self->conflicting_method_metaclass->new(@_); + } + + $self->add_required_methods($method); +} + +## ------------------------------------------------------------------ +## method modifiers + +# NOTE: +# the before/around/after method modifiers are +# stored by name, but there can be many methods +# then associated with that name. So again we have +# lots of similar functionality, so we can do some +# meta-programmin' and save some time. +# - SL + +foreach my $modifier_type (qw[ before around after ]) { + + my $attr_reader = "get_${modifier_type}_method_modifiers_map"; + + # create the attribute ... + $META->add_attribute("${modifier_type}_method_modifiers" => ( + reader => $attr_reader, + default => sub { {} }, + Class::MOP::_definition_context(), + )); + + # and some helper methods ... + $META->add_method("get_${modifier_type}_method_modifiers" => sub { + my ($self, $method_name) = @_; + #return () unless exists $self->$attr_reader->{$method_name}; + my $mm = $self->$attr_reader->{$method_name}; + $mm ? @$mm : (); + }); + + $META->add_method("has_${modifier_type}_method_modifiers" => sub { + my ($self, $method_name) = @_; + # NOTE: + # for now we assume that if it exists,.. + # it has at least one modifier in it + (exists $self->$attr_reader->{$method_name}) ? 1 : 0; + }); + + $META->add_method("add_${modifier_type}_method_modifier" => sub { + my ($self, $method_name, $method) = @_; + + $self->$attr_reader->{$method_name} = [] + unless exists $self->$attr_reader->{$method_name}; + + my $modifiers = $self->$attr_reader->{$method_name}; + + # NOTE: + # check to see that we aren't adding the + # same code twice. We err in favor of the + # first on here, this may not be as expected + foreach my $modifier (@{$modifiers}) { + return if $modifier == $method; + } + + push @{$modifiers} => $method; + }); + +} + +## ------------------------------------------------------------------ +## override method modifiers + +$META->add_attribute('override_method_modifiers' => ( + reader => 'get_override_method_modifiers_map', + default => sub { {} }, + Class::MOP::_definition_context(), +)); + +# NOTE: +# these are a little different because there +# can only be one per name, whereas the other +# method modifiers can have multiples. +# - SL + +sub add_override_method_modifier { + my ($self, $method_name, $method) = @_; + (!$self->has_method($method_name)) + || throw_exception( CannotOverrideALocalMethod => method_name => $method_name, + role_name => $self->name, + ); + $self->get_override_method_modifiers_map->{$method_name} = $method; +} + +sub has_override_method_modifier { + my ($self, $method_name) = @_; + # NOTE: + # for now we assume that if it exists,.. + # it has at least one modifier in it + (exists $self->get_override_method_modifiers_map->{$method_name}) ? 1 : 0; +} + +sub get_override_method_modifier { + my ($self, $method_name) = @_; + $self->get_override_method_modifiers_map->{$method_name}; +} + +## general list accessor ... + +sub get_method_modifier_list { + my ($self, $modifier_type) = @_; + my $accessor = "get_${modifier_type}_method_modifiers_map"; + keys %{$self->$accessor}; +} + +sub _meta_method_class { 'Moose::Meta::Method::Meta' } + +## ------------------------------------------------------------------ +## subroles + +$META->add_attribute('roles' => ( + reader => 'get_roles', + default => sub { [] }, + Class::MOP::_definition_context(), +)); + +sub add_role { + my ($self, $role) = @_; + (blessed($role) && $role->isa('Moose::Meta::Role')) + || throw_exception( AddRoleToARoleTakesAMooseMetaRole => role_to_be_added => $role, + role_name => $self->name, + ); + push @{$self->get_roles} => $role; + $self->reset_package_cache_flag; +} + +sub calculate_all_roles { + my $self = shift; + my %seen; + grep { + !$seen{$_->name}++ + } ($self, map { + $_->calculate_all_roles + } @{ $self->get_roles }); +} + +sub does_role { + my ($self, $role) = @_; + (defined $role) + || throw_exception( RoleNameRequiredForMooseMetaRole => role_name => $self->name ); + my $role_name = blessed $role ? $role->name : $role; + # if we are it,.. then return true + return 1 if $role_name eq $self->name; + # otherwise.. check our children + foreach my $role (@{$self->get_roles}) { + return 1 if $role->does_role($role_name); + } + return 0; +} + +sub find_method_by_name { (shift)->get_method(@_) } + +## ------------------------------------------------------------------ +## role construction +## ------------------------------------------------------------------ + +sub apply { + my ($self, $other, %args) = @_; + + (blessed($other)) + || throw_exception( ApplyTakesABlessedInstance => param => $other, + role_name => $self->name, + ); + + my $application_class; + if ($other->isa('Moose::Meta::Role')) { + $application_class = $self->application_to_role_class; + } + elsif ($other->isa('Moose::Meta::Class')) { + $application_class = $self->application_to_class_class; + } + else { + $application_class = $self->application_to_instance_class; + } + + Moose::Util::_load_user_class($application_class); + + if ( exists $args{'-excludes'} ) { + # I wish we had coercion here :) + $args{'-excludes'} = ( + ref $args{'-excludes'} eq 'ARRAY' + ? $args{'-excludes'} + : [ $args{'-excludes'} ] + ); + } + + return $application_class->new(%args)->apply($self, $other, \%args); +} + +sub composition_class_roles { } + +sub combine { + my ($class, @role_specs) = @_; + + require Moose::Meta::Role::Composite; + + my (@roles, %role_params); + while (@role_specs) { + my ($role, $params) = @{ splice @role_specs, 0, 1 }; + my $requested_role + = blessed $role + ? $role + : Class::MOP::class_of($role); + + my $actual_role = $requested_role->_role_for_combination($params); + push @roles => $actual_role; + + next unless defined $params; + $role_params{$actual_role->name} = $params; + } + + my $c = Moose::Meta::Role::Composite->new(roles => \@roles); + return $c->apply_params(\%role_params); +} + +sub _role_for_combination { + my ($self, $params) = @_; + return $self; +} + +sub create { + my $class = shift; + my @args = @_; + + unshift @args, 'package' if @args % 2 == 1; + my %options = @args; + + (ref $options{attributes} eq 'HASH') + || throw_exception( CreateTakesHashRefOfAttributes => params => \%options, + attribute_class => $class + ) + if exists $options{attributes}; + + (ref $options{methods} eq 'HASH') + || throw_exception( CreateTakesHashRefOfMethods => params => \%options, + attribute_class => $class + ) + if exists $options{methods}; + + (ref $options{roles} eq 'ARRAY') + || throw_exception( CreateTakesArrayRefOfRoles => params => \%options, + attribute_class => $class + ) + if exists $options{roles}; + + my $package = delete $options{package}; + my $roles = delete $options{roles}; + my $attributes = delete $options{attributes}; + my $methods = delete $options{methods}; + my $meta_name = exists $options{meta_name} + ? delete $options{meta_name} + : 'meta'; + + my $meta = $class->SUPER::create($package => %options); + + $meta->_add_meta_method($meta_name) + if defined $meta_name; + + if (defined $attributes) { + foreach my $attribute_name (keys %{$attributes}) { + my $attr = $attributes->{$attribute_name}; + $meta->add_attribute( + $attribute_name => blessed $attr ? $attr : %{$attr} ); + } + } + + if (defined $methods) { + foreach my $method_name (keys %{$methods}) { + $meta->add_method($method_name, $methods->{$method_name}); + } + } + + if ($roles) { + Moose::Util::apply_all_roles($meta, @$roles); + } + + return $meta; +} + +sub consumers { + my $self = shift; + my @consumers; + for my $meta (Class::MOP::get_all_metaclass_instances) { + next if $meta->name eq $self->name; + next unless $meta->isa('Moose::Meta::Class') + || $meta->isa('Moose::Meta::Role'); + push @consumers, $meta->name + if $meta->does_role($self->name); + } + return @consumers; +} + +# XXX: something more intelligent here? +sub _anon_package_prefix { 'Moose::Meta::Role::__ANON__::SERIAL::' } + +sub create_anon_role { shift->create_anon(@_) } +sub is_anon_role { shift->is_anon(@_) } + +sub _anon_cache_key { + my $class = shift; + my %options = @_; + + # XXX fix this duplication (see MMC::_anon_cache_key + my $roles = Data::OptList::mkopt(($options{roles} || []), { + moniker => 'role', + val_test => sub { ref($_[0]) eq 'HASH' }, + }); + + my @role_keys; + for my $role_spec (@$roles) { + my ($role, $params) = @$role_spec; + $params = { %$params }; + + my $key = blessed($role) ? $role->name : $role; + + if ($params && %$params) { + my $alias = delete $params->{'-alias'} + || delete $params->{'alias'} + || {}; + my $excludes = delete $params->{'-excludes'} + || delete $params->{'excludes'} + || []; + $excludes = [$excludes] unless ref($excludes) eq 'ARRAY'; + + if (%$params) { + warn "Roles with parameters cannot be cached. Consider " + . "applying the parameters before calling " + . "create_anon_class, or using 'weaken => 0' instead"; + return; + } + + my $alias_key = join('%', + map { $_ => $alias->{$_} } sort keys %$alias + ); + my $excludes_key = join('%', + sort @$excludes + ); + $key .= '<' . join('+', 'a', $alias_key, 'e', $excludes_key) . '>'; + } + + push @role_keys, $key; + } + + # Makes something like Role|Role::1 + return join('|', sort @role_keys); +} + +##################################################################### +## NOTE: +## This is Moose::Meta::Role as defined by Moose (plus the use of +## MooseX::AttributeHelpers module). It is here as a reference to +## make it easier to see what is happening above with all the meta +## programming. - SL +##################################################################### +# +# has 'roles' => ( +# metaclass => 'Array', +# reader => 'get_roles', +# isa => 'ArrayRef[Moose::Meta::Role]', +# default => sub { [] }, +# provides => { +# 'push' => 'add_role', +# } +# ); +# +# has 'excluded_roles_map' => ( +# metaclass => 'Hash', +# reader => 'get_excluded_roles_map', +# isa => 'HashRef[Str]', +# provides => { +# # Not exactly set, cause it sets multiple +# 'set' => 'add_excluded_roles', +# 'keys' => 'get_excluded_roles_list', +# 'exists' => 'excludes_role', +# } +# ); +# +# has 'required_methods' => ( +# metaclass => 'Hash', +# reader => 'get_required_methods_map', +# isa => 'HashRef[Moose::Meta::Role::Method::Required]', +# provides => { +# # not exactly set, or delete since it works for multiple +# 'set' => 'add_required_methods', +# 'delete' => 'remove_required_methods', +# 'keys' => 'get_required_method_list', +# 'exists' => 'requires_method', +# } +# ); +# +# # the before, around and after modifiers are +# # HASH keyed by method-name, with ARRAY of +# # CODE refs to apply in that order +# +# has 'before_method_modifiers' => ( +# metaclass => 'Hash', +# reader => 'get_before_method_modifiers_map', +# isa => 'HashRef[ArrayRef[CodeRef]]', +# provides => { +# 'keys' => 'get_before_method_modifiers', +# 'exists' => 'has_before_method_modifiers', +# # This actually makes sure there is an +# # ARRAY at the given key, and pushed onto +# # it. It also checks for duplicates as well +# # 'add' => 'add_before_method_modifier' +# } +# ); +# +# has 'after_method_modifiers' => ( +# metaclass => 'Hash', +# reader =>'get_after_method_modifiers_map', +# isa => 'HashRef[ArrayRef[CodeRef]]', +# provides => { +# 'keys' => 'get_after_method_modifiers', +# 'exists' => 'has_after_method_modifiers', +# # This actually makes sure there is an +# # ARRAY at the given key, and pushed onto +# # it. It also checks for duplicates as well +# # 'add' => 'add_after_method_modifier' +# } +# ); +# +# has 'around_method_modifiers' => ( +# metaclass => 'Hash', +# reader =>'get_around_method_modifiers_map', +# isa => 'HashRef[ArrayRef[CodeRef]]', +# provides => { +# 'keys' => 'get_around_method_modifiers', +# 'exists' => 'has_around_method_modifiers', +# # This actually makes sure there is an +# # ARRAY at the given key, and pushed onto +# # it. It also checks for duplicates as well +# # 'add' => 'add_around_method_modifier' +# } +# ); +# +# # override is similar to the other modifiers +# # except that it is not an ARRAY of code refs +# # but instead just a single name->code mapping +# +# has 'override_method_modifiers' => ( +# metaclass => 'Hash', +# reader =>'get_override_method_modifiers_map', +# isa => 'HashRef[CodeRef]', +# provides => { +# 'keys' => 'get_override_method_modifier', +# 'exists' => 'has_override_method_modifier', +# 'add' => 'add_override_method_modifier', # checks for local method .. +# } +# ); +# +##################################################################### + + +1; + +# ABSTRACT: The Moose Role metaclass + +__END__ + +=pod + +=encoding UTF-8 + +=head1 NAME + +Moose::Meta::Role - The Moose Role metaclass + +=head1 VERSION + +version 2.1405 + +=head1 DESCRIPTION + +This class is a subclass of L<Class::MOP::Module> that provides +additional Moose-specific functionality. + +Its API looks a lot like L<Moose::Meta::Class>, but internally it +implements many things differently. This may change in the future. + +=head1 INHERITANCE + +C<Moose::Meta::Role> is a subclass of L<Class::MOP::Module>. + +=head1 METHODS + +=head2 Construction + +=over 4 + +=item B<< Moose::Meta::Role->initialize($role_name) >> + +This method creates a new role object with the provided name. + +=item B<< Moose::Meta::Role->combine( [ $role => { ... } ], [ $role ], ... ) >> + +This method accepts a list of array references. Each array reference +should contain a role name or L<Moose::Meta::Role> object as its first element. The second element is +an optional hash reference. The hash reference can contain C<-excludes> +and C<-alias> keys to control how methods are composed from the role. + +The return value is a new L<Moose::Meta::Role::Composite> that +represents the combined roles. + +=item B<< $metarole->composition_class_roles >> + +When combining multiple roles using C<combine>, this method is used to obtain a +list of role names to be applied to the L<Moose::Meta::Role::Composite> +instance returned by C<combine>. The default implementation returns an empty +list. Extensions that need to hook into role combination may wrap this method +to return additional role names. + +=item B<< Moose::Meta::Role->create($name, %options) >> + +This method is identical to the L<Moose::Meta::Class> C<create> +method. + +=item B<< Moose::Meta::Role->create_anon_role >> + +This method is identical to the L<Moose::Meta::Class> +C<create_anon_class> method. + +=item B<< $metarole->is_anon_role >> + +Returns true if the role is an anonymous role. + +=item B<< $metarole->consumers >> + +Returns a list of names of classes and roles which consume this role. + +=back + +=head2 Role application + +=over 4 + +=item B<< $metarole->apply( $thing, @options ) >> + +This method applies a role to the given C<$thing>. That can be another +L<Moose::Meta::Role>, object, a L<Moose::Meta::Class> object, or a +(non-meta) object instance. + +The options are passed directly to the constructor for the appropriate +L<Moose::Meta::Role::Application> subclass. + +Note that this will apply the role even if the C<$thing> in question already +C<does> this role. L<Moose::Util/does_role> is a convenient wrapper for +finding out if role application is necessary. + +=back + +=head2 Roles and other roles + +=over 4 + +=item B<< $metarole->get_roles >> + +This returns an array reference of roles which this role does. This +list may include duplicates. + +=item B<< $metarole->calculate_all_roles >> + +This returns a I<unique> list of all roles that this role does, and +all the roles that its roles do. + +=item B<< $metarole->does_role($role) >> + +Given a role I<name> or L<Moose::Meta::Role> object, returns true if this role +does the given role. + +=item B<< $metarole->add_role($role) >> + +Given a L<Moose::Meta::Role> object, this adds the role to the list of +roles that the role does. + +=item B<< $metarole->get_excluded_roles_list >> + +Returns a list of role names which this role excludes. + +=item B<< $metarole->excludes_role($role_name) >> + +Given a role I<name>, returns true if this role excludes the named +role. + +=item B<< $metarole->add_excluded_roles(@role_names) >> + +Given one or more role names, adds those roles to the list of excluded +roles. + +=back + +=head2 Methods + +The methods for dealing with a role's methods are all identical in API +and behavior to the same methods in L<Class::MOP::Class>. + +=over 4 + +=item B<< $metarole->method_metaclass >> + +Returns the method metaclass name for the role. This defaults to +L<Moose::Meta::Role::Method>. + +=item B<< $metarole->get_method($name) >> + +=item B<< $metarole->has_method($name) >> + +=item B<< $metarole->add_method( $name, $body ) >> + +=item B<< $metarole->get_method_list >> + +=item B<< $metarole->find_method_by_name($name) >> + +These methods are all identical to the methods of the same name in +L<Class::MOP::Package> + +=back + +=head2 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 +L<Class::MOP::Class>. + +However, attributes stored in this class are I<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 C<add_attribute> method. + +This is quite likely to change in the future. + +=over 4 + +=item B<< $metarole->get_attribute($attribute_name) >> + +=item B<< $metarole->has_attribute($attribute_name) >> + +=item B<< $metarole->get_attribute_list >> + +=item B<< $metarole->add_attribute($name, %options) >> + +=item B<< $metarole->remove_attribute($attribute_name) >> + +=back + +=head2 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 L<Class::MOP::Class>. + +=over 4 + +=item B<< $metarole->is_overloaded >> + +=item B<< $metarole->get_overloaded_operator($op) >> + +=item B<< $metarole->has_overloaded_operator($op) >> + +=item B<< $metarole->get_overload_list >> + +=item B<< $metarole->get_all_overloaded_operators >> + +=item B<< $metarole->add_overloaded_operator($op, $impl) >> + +=item B<< $metarole->remove_overloaded_operator($op) >> + +=back + +=head2 Required methods + +=over 4 + +=item B<< $metarole->get_required_method_list >> + +Returns the list of methods required by the role. + +=item B<< $metarole->requires_method($name) >> + +Returns true if the role requires the named method. + +=item B<< $metarole->add_required_methods(@names) >> + +Adds the named methods to the role's list of required methods. + +=item B<< $metarole->remove_required_methods(@names) >> + +Removes the named methods from the role's list of required methods. + +=item B<< $metarole->add_conflicting_method(%params) >> + +Instantiate the parameters as a L<Moose::Meta::Role::Method::Conflicting> +object, then add it to the required method list. + +=back + +=head2 Method modifiers + +These methods act like their counterparts in L<Class::MOP::Class> and +L<Moose::Meta::Class>. + +However, method modifiers are simply stored internally, and are not +applied until the role itself is applied to a class. + +=over 4 + +=item B<< $metarole->add_after_method_modifier($method_name, $method) >> + +=item B<< $metarole->add_around_method_modifier($method_name, $method) >> + +=item B<< $metarole->add_before_method_modifier($method_name, $method) >> + +=item B<< $metarole->add_override_method_modifier($method_name, $method) >> + +These methods all add an appropriate modifier to the internal list of +modifiers. + +=item B<< $metarole->has_after_method_modifiers >> + +=item B<< $metarole->has_around_method_modifiers >> + +=item B<< $metarole->has_before_method_modifiers >> + +=item B<< $metarole->has_override_method_modifier >> + +Return true if the role has any modifiers of the given type. + +=item B<< $metarole->get_after_method_modifiers($method_name) >> + +=item B<< $metarole->get_around_method_modifiers($method_name) >> + +=item B<< $metarole->get_before_method_modifiers($method_name) >> + +Given a method name, returns a list of the appropriate modifiers for +that method. + +=item B<< $metarole->get_override_method_modifier($method_name) >> + +Given a method name, returns the override method modifier for that +method, if it has one. + +=back + +=head2 Introspection + +=over 4 + +=item B<< Moose::Meta::Role->meta >> + +This will return a L<Class::MOP::Class> instance for this class. + +=back + +=head1 BUGS + +See L<Moose/BUGS> for details on reporting bugs. + +=head1 AUTHORS + +=over 4 + +=item * + +Stevan Little <stevan.little@iinteractive.com> + +=item * + +Dave Rolsky <autarch@urth.org> + +=item * + +Jesse Luehrs <doy@tozt.net> + +=item * + +Shawn M Moore <code@sartak.org> + +=item * + +יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org> + +=item * + +Karen Etheridge <ether@cpan.org> + +=item * + +Florian Ragwitz <rafl@debian.org> + +=item * + +Hans Dieter Pearcey <hdp@weftsoar.net> + +=item * + +Chris Prather <chris@prather.org> + +=item * + +Matt S Trout <mst@shadowcat.co.uk> + +=back + +=head1 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. + +=cut |