use Carp 'confess';
use Scalar::Util 'blessed', 'weaken';
-our $VERSION = '0.57';
+our $VERSION = '0.75_01';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
-use base 'Moose::Meta::Method';
+use base 'Moose::Meta::Method',
+ 'Class::MOP::Method::Generated';
sub new {
my $class = shift;
my %options = @_;
- (exists $options{attribute})
+ ( exists $options{attribute} )
|| confess "You must supply an attribute to construct with";
- (blessed($options{attribute}) && $options{attribute}->isa('Class::MOP::Attribute'))
- || confess "You must supply an attribute which is a 'Class::MOP::Attribute' instance";
+ ( blessed( $options{attribute} )
+ && $options{attribute}->isa('Moose::Meta::Attribute') )
+ || confess
+ "You must supply an attribute which is a 'Moose::Meta::Attribute' instance";
- ($options{package_name} && $options{name})
- || confess "You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT";
+ ( $options{package_name} && $options{name} )
+ || confess
+ "You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT";
- my $self = $class->_new(\%options);
+ ( $options{delegate_to_method} && ( !ref $options{delegate_to_method} )
+ || ( 'CODE' eq ref $options{delegate_to_method} ) )
+ || confess
+ 'You must supply a delegate_to_method which is a method name or a CODE reference';
- weaken($self->{'attribute'});
+ my $self = $class->_new( \%options );
+
+ weaken( $self->{'attribute'} );
+
+ $self->_initialize_body;
return $self;
}
+sub _new {
+ my $class = shift;
+ my $options = @_ == 1 ? $_[0] : {@_};
+
+ return bless $options, $class;
+}
+
+sub associated_attribute { (shift)->{'attribute'} }
+
+sub delegate_to_method { (shift)->{'delegate_to_method'} }
+
+sub _initialize_body {
+ my $self = shift;
+
+ my $method_to_call = $self->delegate_to_method;
+ return $self->{body} = $method_to_call
+ if ref $method_to_call;
+
+ my $accessor = $self->_get_delegate_accessor;
+
+ my $handle_name = $self->name;
+
+ # NOTE: we used to do a goto here, but the goto didn't handle
+ # failure correctly (it just returned nothing), so I took that
+ # out. However, the more I thought about it, the less I liked it
+ # doing the goto, and I prefered the act of delegation being
+ # actually represented in the stack trace. - SL
+ # not inlining this, since it won't really speed things up at
+ # all... the only thing that would end up different would be
+ # interpolating in $method_to_call, and a bunch of things in the
+ # error handling that mostly never gets called - doy
+ $self->{body} = sub {
+ my $instance = shift;
+ my $proxy = $instance->$accessor();
+ ( defined $proxy )
+ || $self->throw_error(
+ "Cannot delegate $handle_name to $method_to_call because "
+ . "the value of "
+ . $self->associated_attribute->name
+ . " is not defined",
+ method_name => $method_to_call,
+ object => $instance
+ );
+ $proxy->$method_to_call(@_);
+ };
+}
+
+sub _get_delegate_accessor {
+ my $self = shift;
+
+ my $accessor = $self->associated_attribute->get_read_method_ref;
+
+ $accessor = $accessor->body if blessed $accessor;
+
+ return $accessor;
+}
+
1;
+
+__END__
+
+=pod
+
+=head1 NAME
+
+Moose::Meta::Method::Delegation - A Moose Method metaclass for delegation methods
+
+=head1 DESCRIPTION
+
+This is a subclass of L<Moose::Meta::Method> for delegation
+methods.
+
+=head1 METHODS
+
+=over 4
+
+=item B<< Moose::Meta::Method::Delegation->new(%options) >>
+
+This creates the delegation methods based on the provided C<%options>.
+
+=over 4
+
+=item I<attribute>
+
+This must be an instance of C<Moose::Meta::Attribute> which this
+accessor is being generated for. This options is B<required>.
+
+=item I<delegate_to_method>
+
+The method in the associated attribute's value to which we
+delegate. This can be either a method name or a code reference.
+
+=back
+
+=item B<< $metamethod->associated_attribute >>
+
+Returns the attribute associated with this method.
+
+=item B<< $metamethod->delegate_to_method >>
+
+Returns the method to which this method delegates, as passed to the
+constructor.
+
+=back
+
+=head1 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.
+
+=head1 AUTHOR
+
+Dave Rolsky E<lt>autarch@urth.orgE<gt>
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright 2009 by Infinity Interactive, Inc.
+
+L<http://www.iinteractive.com>
+
+This library is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
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