Checking in changes prior to tagging of version 0.89.
[gitmo/Mouse.git] / lib / Mouse / Meta / Method / Delegation.pm
CommitLineData
d7d8d49b 1package Mouse::Meta::Method::Delegation;
3821b191 2use Mouse::Util qw(:meta); # enables strict and warnings
3use Scalar::Util;
d7d8d49b 4
5sub _generate_delegation{
21ee5bbb 6 my (undef, $attr, $handle_name, $method_to_call) = @_;
7
8 my @curried_args;
9 if(ref($method_to_call) eq 'ARRAY'){
10 ($method_to_call, @curried_args) = @{$method_to_call};
11 }
cb80a70a 12
1134f694 13 # If it has a reader, we must use it to make method modifiers work
14 my $reader = $attr->get_read_method() || $attr->get_read_method_ref();
cb80a70a 15
73468dac 16 my $can_be_optimized = $attr->{_mouse_cache_method_delegation_can_be_optimized};
cb80a70a 17
18 if(!defined $can_be_optimized){
1134f694 19 my $tc = $attr->type_constraint;
73468dac 20 $attr->{_mouse_cache_method_delegation_can_be_optimized} =
cb80a70a 21 (defined($tc) && $tc->is_a_type_of('Object'))
22 && ($attr->is_required || $attr->has_default || $attr->has_builder)
23 && ($attr->is_lazy || !$attr->has_clearer);
24 }
25
26 if($can_be_optimized){
27 # need not check the attribute value
28 return sub {
29 return shift()->$reader()->$method_to_call(@curried_args, @_);
30 };
31 }
32 else {
33 # need to check the attribute value
34 return sub {
35 my $instance = shift;
36 my $proxy = $instance->$reader();
37
38 my $error = !defined($proxy) ? ' is not defined'
39 : ref($proxy) && !Scalar::Util::blessed($proxy) ? qq{ is not an object (got '$proxy')}
40 : undef;
41 if ($error) {
42 $instance->meta->throw_error(
43 "Cannot delegate $handle_name to $method_to_call because "
44 . "the value of "
45 . $attr->name
46 . $error
47 );
48 }
49 $proxy->$method_to_call(@curried_args, @_);
50 };
51 }
d7d8d49b 52}
53
54
551;
56__END__
57
58=head1 NAME
59
60Mouse::Meta::Method::Delegation - A Mouse method generator for delegation methods
61
62=head1 VERSION
63
5b3e7678 64This document describes Mouse version 0.89
d7d8d49b 65
66=head1 SEE ALSO
67
68L<Moose::Meta::Method::Delegation>
69
70=cut