2 package Moose::Meta::Method::Delegation;
8 use Scalar::Util 'blessed', 'weaken';
10 our $VERSION = '0.67';
11 $VERSION = eval $VERSION;
12 our $AUTHORITY = 'cpan:STEVAN';
14 use base 'Moose::Meta::Method',
15 'Class::MOP::Method::Generated';
22 ( exists $options{attribute} )
23 || confess "You must supply an attribute to construct with";
25 ( blessed( $options{attribute} )
26 && $options{attribute}->isa('Moose::Meta::Attribute') )
28 "You must supply an attribute which is a 'Moose::Meta::Attribute' instance";
30 ( $options{package_name} && $options{name} )
32 "You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT";
34 ( $options{delegate_to_method} && ( !ref $options{delegate_to_method} )
35 || ( 'CODE' eq ref $options{delegate_to_method} ) )
37 'You must supply a delegate_to_method which is a method name or a CODE reference';
39 my $self = $class->_new( \%options );
41 weaken( $self->{'attribute'} );
43 $self->_initialize_body;
50 my $options = @_ == 1 ? $_[0] : {@_};
52 return bless $options, $class;
55 sub associated_attribute { (shift)->{'attribute'} }
57 sub delegate_to_method { (shift)->{'delegate_to_method'} }
59 sub _initialize_body {
62 my $method_to_call = $self->delegate_to_method;
63 return $self->{body} = $method_to_call
64 if ref $method_to_call;
66 my $accessor = $self->_get_delegate_accessor;
68 my $handle_name = $self->name;
70 # NOTE: we used to do a goto here, but the goto didn't handle
71 # failure correctly (it just returned nothing), so I took that
72 # out. However, the more I thought about it, the less I liked it
73 # doing the goto, and I prefered the act of delegation being
74 # actually represented in the stack trace. - SL
77 my $proxy = $instance->$accessor();
79 || $self->throw_error(
80 "Cannot delegate $handle_name to $method_to_call because "
84 method_name => $method_to_call,
87 $proxy->$method_to_call(@_);
91 sub _get_delegate_accessor {
94 my $accessor = $self->associated_attribute->get_read_method_ref;
96 $accessor = $accessor->body if blessed $accessor;
109 Moose::Meta::Method::Delegation - A Moose Method metaclass for delegation methods
113 This is a subclass of L<Moose::Meta::Method> for delegation
120 =item B<new (%options)>
122 This creates the method based on the criteria in C<%options>,
129 This must be an instance of C<Moose::Meta::Attribute> which this
130 accessor is being generated for. This parameter is B<required>.
132 =item I<delegate_to_method>
134 The method in the associated attribute's value to which we
135 delegate. This can be either a method name or a code reference.
139 =item B<associated_attribute>
141 Returns the attribute associated with this method.
143 =item B<delegate_to_method>
145 Returns the method to which this method delegates.
151 All complex software has bugs lurking in it, and this module is no
152 exception. If you find a bug please either email me, or add the bug
157 Dave Rolsky E<lt>autarch@urth.orgE<gt>
159 =head1 COPYRIGHT AND LICENSE
161 Copyright 2009 by Infinity Interactive, Inc.
163 L<http://www.iinteractive.com>
165 This library is free software; you can redistribute it and/or modify
166 it under the same terms as Perl itself.