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ETHER / Moose-2.2207 / lib / Class / MOP / Mixin / HasAttributes.pm 

            

              
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package Class::MOP::Mixin::HasAttributes;
our $VERSION = '2.2207';
use strict;
use warnings;
use Scalar::Util 'blessed';
use parent 'Class::MOP::Mixin';
sub add_attribute {
    my $self = shift;
    my $attribute
        = blessed( $_[0] ) ? $_[0] : $self->attribute_metaclass->new(@_);
    ( $attribute->isa('Class::MOP::Mixin::AttributeCore') )
        || $self->_throw_exception( AttributeMustBeAnClassMOPMixinAttributeCoreOrSubclass => attribute  => $attribute,
                                                                                     class_name => $self->name,
                          );
    $self->_attach_attribute($attribute);
    my $attr_name = $attribute->name;
    $self->remove_attribute($attr_name)
        if $self->has_attribute($attr_name);
    my $order = ( scalar keys %{ $self->_attribute_map } );
    $attribute->_set_insertion_order($order);
    $self->_attribute_map->{$attr_name} = $attribute;
    # This method is called to allow for installing accessors. Ideally, we'd
    # use method overriding, but then the subclass would be responsible for
    # making the attribute, which would end up with lots of code
    # duplication. Even more ideally, we'd use augment/inner, but this is
    # Class::MOP!
    $self->_post_add_attribute($attribute)
        if $self->can('_post_add_attribute');
    return $attribute;
}
sub has_attribute {
    my ( $self, $attribute_name ) = @_;
    ( defined $attribute_name )
        || $self->_throw_exception( MustDefineAnAttributeName => class_name => $self->name );
    exists $self->_attribute_map->{$attribute_name};
}
sub get_attribute {
    my ( $self, $attribute_name ) = @_;
    ( defined $attribute_name )
        || $self->_throw_exception( MustDefineAnAttributeName => class_name => $self->name );
    return $self->_attribute_map->{$attribute_name};
}
sub remove_attribute {
    my ( $self, $attribute_name ) = @_;
    ( defined $attribute_name )
        || $self->_throw_exception( MustDefineAnAttributeName => class_name => $self->name );
    my $removed_attribute = $self->_attribute_map->{$attribute_name};
    return unless defined $removed_attribute;
    delete $self->_attribute_map->{$attribute_name};
    return $removed_attribute;
}
sub get_attribute_list {
    my $self = shift;
    keys %{ $self->_attribute_map };
}
sub _restore_metaattributes_from {
    my $self = shift;
    my ($old_meta) = @_;
    for my $attr (sort { $a->insertion_order <=> $b->insertion_order }
                       map { $old_meta->get_attribute($_) }
                           $old_meta->get_attribute_list) {
        $attr->_make_compatible_with($self->attribute_metaclass);
        $self->add_attribute($attr);
    }
}
1;
# ABSTRACT: Methods for metaclasses which have attributes
__END__
=pod
=encoding UTF-8
=head1 NAME
Class::MOP::Mixin::HasAttributes - Methods for metaclasses which have attributes
=head1 VERSION
version 2.2207
=head1 DESCRIPTION
This class implements methods for metaclasses which have attributes
(L<Class::MOP::Class> and L<Moose::Meta::Role>). See L<Class::MOP::Class> for
API details.
=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