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package Moose::Meta::Role::Composite;
our $VERSION = '2.2207';
use strict;
use warnings;
use metaclass;
use Scalar::Util 'blessed';
use Moose::Util 'throw_exception';
use parent 'Moose::Meta::Role';
# NOTE:
# we need to override the ->name
# method from Class::MOP::Package
# since we don't have an actual
# package for this.
# - SL
__PACKAGE__->meta->add_attribute('name' => (
    reader => 'name',
    Class::MOP::_definition_context(),
));
# NOTE:
# Again, since we don't have a real
# package to store our methods in,
# we use a HASH ref instead.
# - SL
__PACKAGE__->meta->add_attribute('_methods' => (
    reader  => '_method_map',
    default => sub { {} },
    Class::MOP::_definition_context(),
));
__PACKAGE__->meta->add_attribute('_overloads' => (
    reader  => '_overload_map',
    default => sub { {} },
    Class::MOP::_definition_context(),
));
__PACKAGE__->meta->add_attribute('_overload_fallback' => (
    accessor  => '_overload_fallback',
    Class::MOP::_definition_context(),
));
__PACKAGE__->meta->add_attribute(
    'application_role_summation_class',
    reader  => 'application_role_summation_class',
    default => 'Moose::Meta::Role::Application::RoleSummation',
    Class::MOP::_definition_context(),
);
sub new {
    my ($class, %params) = @_;
    # the roles param is required ...
    foreach ( @{$params{roles}} ) {
        unless ( $_->isa('Moose::Meta::Role') ) {
            throw_exception( RolesListMustBeInstancesOfMooseMetaRole => params => \%params,
                                                                        role   => $_,
                                                                        class  => $class
                           );
        }
    }
    my @composition_roles = map {
        $_->composition_class_roles
    } @{ $params{roles} };
    if (@composition_roles) {
        my $meta = Moose::Meta::Class->create_anon_class(
            superclasses => [ $class ],
            roles        => [ @composition_roles ],
            cache        => 1,
        );
        $class = $meta->name;
    }
    # and the name is created from the
    # roles if one has not been provided
    $params{name} ||= (join "|" => map { $_->name } @{$params{roles}});
    $class->_new(\%params);
}
# There's no such thing as an anonymous composite role since composites are an
# artifact of Moose's internals. However, a composite role that contains an
# anon role may _look_ like an anon role since $self->name =~ /$anon_key/ can
# return true if the first role in the composite is anonymous itself.
sub is_anon { 0 }
# This is largely a copy of what's in Moose::Meta::Role (itself
# largely a copy of Class::MOP::Class). However, we can't actually
# call add_package_symbol, because there's no package into which to
# add the symbol.
sub add_method {
    my ($self, $method_name, $method) = @_;
    unless ( defined $method_name && $method_name ) {
        throw_exception( MustDefineAMethodName => instance => $self );
    }
    my $body;
    if (blessed($method)) {
        $body = $method->body;
        if ($method->package_name ne $self->name) {
            $method = $method->clone(
                package_name => $self->name,
                name         => $method_name
            ) if $method->can('clone');
        }
    }
    else {
        $body = $method;
        $method = $self->wrap_method_body( body => $body, name => $method_name );
    }
    $self->_method_map->{$method_name} = $method;
}
sub get_method_list {
    my $self = shift;
    return keys %{ $self->_method_map };
}
sub _get_local_methods {
    my $self = shift;
    return values %{ $self->_method_map };
}
sub has_method {
    my ($self, $method_name) = @_;
    return exists $self->_method_map->{$method_name};
}
sub get_method {
    my ($self, $method_name) = @_;
    return $self->_method_map->{$method_name};
}
sub is_overloaded {
    my ($self) = @_;
    return keys %{ $self->_overload_map };
}
sub add_overloaded_operator {
    my ( $self, $op_name, $overload ) = @_;
    unless ( defined $op_name && $op_name ) {
        throw_exception(
            'MustDefineAnOverloadOperator',
            instance => $self,
        );
    }
    $self->_overload_map->{$op_name} = $overload;
}
sub get_overload_fallback_value {
    my ($self) = @_;
    return $self->_overload_fallback;
}
sub set_overload_fallback_value {
    my $self = shift;
    $self->_overload_fallback(shift);
}
sub get_all_overloaded_operators {
    my ( $self, $method_name ) = @_;
    return values %{ $self->_overload_map };
}
sub apply_params {
    my ($self, $role_params) = @_;
    Moose::Util::_load_user_class($self->application_role_summation_class);
    $self->application_role_summation_class->new(
        role_params => $role_params,
    )->apply($self);
    return $self;
}
sub reinitialize {
    my ( $class, $old_meta, @args ) = @_;
    throw_exception( CannotInitializeMooseMetaRoleComposite => old_meta       => $old_meta,
                                                               args           => \@args,
                                                               role_composite => $class
                   )
        if !blessed $old_meta
            || !$old_meta->isa('Moose::Meta::Role::Composite');
    my %existing_classes = map { $_ => $old_meta->$_() } qw(
        application_role_summation_class
    );
    return $old_meta->meta->clone_object( $old_meta, %existing_classes, @args );
}
1;
# ABSTRACT: An object to represent the set of roles
__END__
HideShow 114 lines of Pod
=pod
=encoding UTF-8
=head1 NAME
Moose::Meta::Role::Composite - An object to represent the set of roles
=head1 VERSION
version 2.2207
=head1 DESCRIPTION
A composite is a role that consists of a set of two or more roles.
The API of a composite role is almost identical to that of a regular
role.
=head1 INHERITANCE
C<Moose::Meta::Role::Composite> is a subclass of L<Moose::Meta::Role>.
=head1 METHODS
=head2 Moose::Meta::Role::Composite->new(%options)
This returns a new composite role object. It accepts the same
options as its parent class, with a few changes:
=over 4
=item * roles
This option is an array reference containing a list of
L<Moose::Meta::Role> object. This is a required option.
=item * name
If a name is not given, one is generated from the roles provided.
=item * apply_params(\%role_params)
Creates a new RoleSummation role application with C<%role_params> and applies
the composite role to it. The RoleSummation role application class used is
determined by the composite role's C<application_role_summation_class>
attribute.
=item * reinitialize($metaclass)
Like C<< Class::MOP::Package->reinitialize >>, but doesn't allow passing a
string with the package name, as there is no real package for composite roles.
=back
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHORS
=over 4
=item *
Stevan Little <stevan@cpan.org>
=item *
Dave Rolsky <autarch@urth.org>
=item *
Jesse Luehrs <doy@cpan.org>
=item *
Shawn M Moore <sartak@cpan.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@cpan.org>
=item *
Chris Prather <chris@prather.org>
=item *
Matt S Trout <mstrout@cpan.org>
=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