2 package Class::MOP::Method;
8 use Scalar::Util 'weaken', 'reftype';
10 our $VERSION = '0.89';
11 $VERSION = eval $VERSION;
12 our $AUTHORITY = 'cpan:STEVAN';
14 use base 'Class::MOP::Object';
17 # if poked in the right way,
18 # they should act like CODE refs.
19 use overload '&{}' => sub { $_[0]->body }, fallback => 1;
24 my ( $class, @args ) = @_;
26 unshift @args, 'body' if @args % 2 == 1;
29 my $code = $params{body};
31 (ref $code && 'CODE' eq reftype($code))
32 || confess "You must supply a CODE reference to bless, not (" . ($code || 'undef') . ")";
34 ($params{package_name} && $params{name})
35 || confess "You must supply the package_name and name parameters";
37 my $self = $class->_new(\%params);
39 weaken($self->{associated_metaclass}) if $self->{associated_metaclass};
46 my $params = @_ == 1 ? $_[0] : {@_};
49 'body' => $params->{body},
50 'associated_metaclass' => $params->{associated_metaclass},
51 'package_name' => $params->{package_name},
52 'name' => $params->{name},
58 sub associated_metaclass { shift->{'associated_metaclass'} }
60 sub _is_valid_generation{
62 my $metaclass = $self->associated_metaclass;
65 return( ($self->{_generation} || 0) == Class::MOP::check_package_cache_flag($metaclass->name) );
72 sub _update_generation {
74 my $metaclass = $self->associated_metaclass
75 or confess("No metaclass associated to the method " . $self->name);
76 $self->{_generation} = Class::MOP::check_package_cache_flag($metaclass->name);
80 my ( $self, $class ) = @_;
81 $self->{associated_metaclass} = $class;
82 weaken($self->{associated_metaclass});
85 sub detach_from_class {
87 delete $self->{associated_metaclass};
90 sub fully_qualified_name {
92 $self->package_name . '::' . $self->name;
95 sub original_method { (shift)->{'original_method'} }
97 sub _set_original_method { $_[0]->{'original_method'} = $_[1] }
99 # It's possible that this could cause a loop if there is a circular
100 # reference in here. That shouldn't ever happen in normal
101 # circumstances, since original method only gets set when clone is
102 # called. We _could_ check for such a loop, but it'd involve some sort
103 # of package-lexical variable, and wouldn't be terribly subclassable.
104 sub original_package_name {
107 $self->original_method
108 ? $self->original_method->original_package_name
109 : $self->package_name;
115 $self->original_method
116 ? $self->original_method->original_name
120 sub original_fully_qualified_name {
123 $self->original_method
124 ? $self->original_method->original_fully_qualified_name
125 : $self->fully_qualified_name;
134 # the Class::MOP bootstrap
135 # will create this for us
147 Class::MOP::Method - Method Meta Object
151 The Method Protocol is very small, since methods in Perl 5 are just
152 subroutines in a specific package. We provide a very basic
153 introspection interface.
159 =item B<< Class::MOP::Method->wrap($code, %options) >>
161 This is the constructor. It accepts a subroutine reference and a hash
170 The method name (without a package name). This is required.
174 The package name for the method. This is required.
176 =item * associated_metaclass
178 An optional L<Class::MOP::Class> object. This is the metaclass for the
183 =item B<< $metamethod->clone(%params) >>
185 This makes a shallow clone of the method object. In particular,
186 subroutine reference itself is shared between all clones of a given
189 When a method is cloned, the original method object will be available
190 by calling C<original_method> on the clone.
192 =item B<< $metamethod->body >>
194 This returns a reference to the method's subroutine.
196 =item B<< $metamethod->name >>
198 This returns the method's name
200 =item B<< $metamethod->package_name >>
202 This returns the method's package name.
204 =item B<< $metamethod->fully_qualified_name >>
206 This returns the method's fully qualified name (package name and
209 =item B<< $metamethod->associated_metaclass >>
211 This returns the L<Class::MOP::Class> object for the method, if one
214 =item B<< $metamethod->original_method >>
216 If this method object was created as a clone of some other method
217 object, this returns the object that was cloned.
219 =item B<< $metamethod->original_name >>
221 This returns the method's original name, wherever it was first
224 If this method is a clone of a clone (of a clone, etc.), this method
225 returns the name from the I<first> method in the chain of clones.
227 =item B<< $metamethod->original_package_name >>
229 This returns the method's original package name, wherever it was first
232 If this method is a clone of a clone (of a clone, etc.), this method
233 returns the package name from the I<first> method in the chain of
236 =item B<< $metamethod->original_fully_qualified_name >>
238 This returns the method's original fully qualified name, wherever it
241 If this method is a clone of a clone (of a clone, etc.), this method
242 returns the fully qualified name from the I<first> method in the chain
245 =item B<< $metamethod->attach_to_class($metaclass) >>
247 Given a L<Class::MOP::Class> object, this method sets the associated
248 metaclass for the method. This will overwrite any existing associated
251 =item B<< $metamethod->detach_from_class >>
253 Removes any associated metaclass object for the method.
255 =item B<< $metamethod->execute(...) >>
257 This executes the method. Any arguments provided will be passed on to
260 =item B<< Class::MOP::Method->meta >>
262 This will return a L<Class::MOP::Class> instance for this class.
264 It should also be noted that L<Class::MOP> will actually bootstrap
265 this module by installing a number of attribute meta-objects into its
272 Stevan Little E<lt>stevan@iinteractive.comE<gt>
274 =head1 COPYRIGHT AND LICENSE
276 Copyright 2006-2009 by Infinity Interactive, Inc.
278 L<http://www.iinteractive.com>
280 This library is free software; you can redistribute it and/or modify
281 it under the same terms as Perl itself.