2 package Class::MOP::Method::Wrapped;
8 use Scalar::Util 'blessed';
10 our $VERSION = '0.82_01';
11 $VERSION = eval $VERSION;
12 our $AUTHORITY = 'cpan:STEVAN';
14 use base 'Class::MOP::Method';
17 # this ugly beast is the result of trying
18 # to micro optimize this as much as possible
19 # while not completely loosing maintainability.
20 # At this point it's "fast enough", after all
21 # you can't get something for nothing :)
22 my $_build_wrapped_method = sub {
23 my $modifier_table = shift;
24 my ($before, $after, $around) = (
25 $modifier_table->{before},
26 $modifier_table->{after},
27 $modifier_table->{around},
29 if (@$before && @$after) {
30 $modifier_table->{cache} = sub {
31 $_->(@_) for @{$before};
33 ((defined wantarray) ?
35 (@rval = $around->{cache}->(@_))
37 ($rval[0] = $around->{cache}->(@_)))
39 $around->{cache}->(@_));
40 $_->(@_) for @{$after};
41 return unless defined wantarray;
42 return wantarray ? @rval : $rval[0];
45 elsif (@$before && !@$after) {
46 $modifier_table->{cache} = sub {
47 $_->(@_) for @{$before};
48 return $around->{cache}->(@_);
51 elsif (@$after && !@$before) {
52 $modifier_table->{cache} = sub {
54 ((defined wantarray) ?
56 (@rval = $around->{cache}->(@_))
58 ($rval[0] = $around->{cache}->(@_)))
60 $around->{cache}->(@_));
61 $_->(@_) for @{$after};
62 return unless defined wantarray;
63 return wantarray ? @rval : $rval[0];
67 $modifier_table->{cache} = $around->{cache};
72 my ( $class, $code, %params ) = @_;
74 (blessed($code) && $code->isa('Class::MOP::Method'))
75 || confess "Can only wrap blessed CODE";
77 my $modifier_table = {
87 $_build_wrapped_method->($modifier_table);
88 my $method = $class->SUPER::wrap(
89 sub { $modifier_table->{cache}->(@_) },
90 # get these from the original
91 # unless explicitly overriden
92 package_name => $params{package_name} || $code->package_name,
93 name => $params{name} || $code->name,
95 $method->{'modifier_table'} = $modifier_table;
99 sub get_original_method {
101 $code->{'modifier_table'}->{orig};
104 sub add_before_modifier {
106 my $modifier = shift;
107 unshift @{$code->{'modifier_table'}->{before}} => $modifier;
108 $_build_wrapped_method->($code->{'modifier_table'});
111 sub before_modifiers {
113 return @{$code->{'modifier_table'}->{before}};
116 sub add_after_modifier {
118 my $modifier = shift;
119 push @{$code->{'modifier_table'}->{after}} => $modifier;
120 $_build_wrapped_method->($code->{'modifier_table'});
123 sub after_modifiers {
125 return @{$code->{'modifier_table'}->{after}};
130 # this is another possible candidate for
131 # optimization as well. There is an overhead
132 # associated with the currying that, if
133 # eliminated might make around modifiers
135 my $compile_around_method = sub {{
137 return $f1 unless @_;
139 push @_, sub { $f2->( $f1, @_ ) };
143 sub add_around_modifier {
145 my $modifier = shift;
146 unshift @{$code->{'modifier_table'}->{around}->{methods}} => $modifier;
147 $code->{'modifier_table'}->{around}->{cache} = $compile_around_method->(
148 @{$code->{'modifier_table'}->{around}->{methods}},
149 $code->{'modifier_table'}->{orig}->body
151 $_build_wrapped_method->($code->{'modifier_table'});
155 sub around_modifiers {
157 return @{$code->{'modifier_table'}->{around}->{methods}};
168 Class::MOP::Method::Wrapped - Method Meta Object for methods with before/after/around modifiers
172 This is a L<Class::MOP::Method> subclass which implements before,
173 after, and around method modifiers.
181 =item B<< Class::MOP::Method::Wrapped->wrap($metamethod, %options) >>
183 This is the constructor. It accepts a L<Class::MOP::Method> object and
192 The method name (without a package name). This will be taken from the
193 provided L<Class::MOP::Method> object if it is not provided.
197 The package name for the method. This will be taken from the provided
198 L<Class::MOP::Method> object if it is not provided.
200 =item * associated_metaclass
202 An optional L<Class::MOP::Class> object. This is the metaclass for the
207 =item B<< $metamethod->get_original_method >>
209 This returns the L<Class::MOP::Method> object that was passed to the
212 =item B<< $metamethod->add_before_modifier($code) >>
214 =item B<< $metamethod->add_after_modifier($code) >>
216 =item B<< $metamethod->add_around_modifier($code) >>
218 These methods all take a subroutine reference and apply it as a
219 modifier to the original method.
221 =item B<< $metamethod->before_modifiers >>
223 =item B<< $metamethod->after_modifiers >>
225 =item B<< $metamethod->around_modifiers >>
227 These methods all return a list of subroutine references which are
228 acting as the specified type of modifier.
234 Stevan Little E<lt>stevan@iinteractive.comE<gt>
236 =head1 COPYRIGHT AND LICENSE
238 Copyright 2006-2009 by Infinity Interactive, Inc.
240 L<http://www.iinteractive.com>
242 This library is free software; you can redistribute it and/or modify
243 it under the same terms as Perl itself.