2 package Moose::AttributeHelpers::Trait::Base;
4 use Moose::Util::TypeConstraints;
7 $VERSION = eval $VERSION;
8 our $AUTHORITY = 'cpan:STEVAN';
10 requires 'helper_type';
12 # these next two are the possible methods
13 # you can use in the 'handles' map.
15 # provide a Class or Role which we can
16 # collect the method providers from
18 # requires_attr 'method_provider'
20 # or you can provide a HASH ref of anon subs
21 # yourself. This will also collect and store
22 # the methods from a method_provider as well
23 has 'method_constructors' => (
29 return +{} unless $self->has_method_provider;
30 # or grab them from the role/class
31 my $method_provider = $self->method_provider->meta;
34 $_ => $method_provider->get_method($_)
35 } $method_provider->get_method_list
40 # extend the parents stuff to make sure
41 # certain bits are now required ...
42 has '+default' => ( required => 1 );
43 has '+type_constraint' => ( required => 1 );
45 ## Methods called prior to instantiation
47 before '_process_options' => sub {
48 my ( $self, $name, $options ) = @_;
50 $self->_check_helper_type( $options, $name );
52 $options->{is} = $self->_default_is
53 if ! exists $options->{is} && $self->can('_default_is');
55 $options->{default} = $self->_default_default
56 if ! exists $options->{default} && $self->can('_default_default');
59 sub _check_helper_type {
60 my ( $self, $options, $name ) = @_;
62 my $type = $self->helper_type;
64 $options->{isa} = $self->helper_type
65 unless exists $options->{isa};
67 my $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint(
70 ( $isa->is_a_type_of($type) )
72 "The type constraint for $name must be a subtype of $type but it's a $isa";
75 around '_canonicalize_handles' => sub {
78 my $handles = $self->handles;
80 return unless $handles;
82 unless ( 'HASH' eq ref $handles ) {
84 "The 'handles' option must be a HASH reference, not $handles" );
88 my $to = $handles->{$_};
89 $to = [$to] unless ref $to;
94 ## methods called after instantiation
96 before 'install_accessors' => sub { (shift)->_check_handles_values };
98 sub _check_handles_values {
101 my $method_constructors = $self->method_constructors;
103 my %handles = $self->_canonicalize_handles;
105 for my $original_method ( values %handles ) {
106 my $name = $original_method->[0];
107 ( exists $method_constructors->{$name} )
108 || confess "$name is an unsupported method type";
113 around '_make_delegation_method' => sub {
115 my ( $self, $handle_name, $method_to_call ) = @_;
117 my ( $name, $curried_args ) = @$method_to_call;
119 $curried_args ||= [];
121 my $method_constructors = $self->method_constructors;
123 my $code = $method_constructors->{$name}->(
125 $self->get_read_method_ref,
126 $self->get_write_method_ref,
133 my $instance = shift;
134 return $code->( $instance, @$curried_args, @_ );
140 no Moose::Util::TypeConstraints;
148 Moose::AttributeHelpers::Trait::Base - base role for helpers
152 All complex software has bugs lurking in it, and this module is no
153 exception. If you find a bug please either email me, or add the bug
164 =head1 COPYRIGHT AND LICENSE
166 Copyright 2007-2009 by Infinity Interactive, Inc.
168 L<http://www.iinteractive.com>
170 This library is free software; you can redistribute it and/or modify
171 it under the same terms as Perl itself.