Commit | Line | Data |
3b5070d1 |
1 | |
2 | package MooseX::AttributeHelpers::Trait::Base; |
3 | use Moose::Role; |
4 | use Moose::Util::TypeConstraints; |
5 | |
6 | our $VERSION = '0.04'; |
7 | our $AUTHORITY = 'cpan:STEVAN'; |
8 | |
9 | requires 'helper_type'; |
10 | |
11 | # this is the method map you define ... |
12 | has 'provides' => ( |
13 | is => 'ro', |
14 | isa => 'HashRef', |
15 | default => sub {{}} |
16 | ); |
17 | |
18 | |
19 | # these next two are the possible methods |
20 | # you can use in the 'provides' map. |
21 | |
22 | # provide a Class or Role which we can |
23 | # collect the method providers from |
dbd51f30 |
24 | |
25 | # requires_attr 'method_provider' |
3b5070d1 |
26 | |
27 | # or you can provide a HASH ref of anon subs |
28 | # yourself. This will also collect and store |
29 | # the methods from a method_provider as well |
30 | has 'method_constructors' => ( |
31 | is => 'ro', |
32 | isa => 'HashRef', |
33 | lazy => 1, |
34 | default => sub { |
35 | my $self = shift; |
36 | return +{} unless $self->has_method_provider; |
37 | # or grab them from the role/class |
38 | my $method_provider = $self->method_provider->meta; |
39 | return +{ |
40 | map { |
41 | $_ => $method_provider->get_method($_) |
42 | } $method_provider->get_method_list |
43 | }; |
44 | }, |
45 | ); |
46 | |
47 | # extend the parents stuff to make sure |
48 | # certain bits are now required ... |
49 | has '+$!default' => (required => 1); |
50 | has '+type_constraint' => (required => 1); |
51 | |
52 | ## Methods called prior to instantiation |
53 | |
54 | sub process_options_for_provides { |
55 | my ($self, $options) = @_; |
56 | |
57 | if (my $type = $self->helper_type) { |
58 | (exists $options->{isa}) |
59 | || confess "You must define a type with the $type metaclass"; |
60 | |
61 | my $isa = $options->{isa}; |
62 | |
63 | unless (blessed($isa) && $isa->isa('Moose::Meta::TypeConstraint')) { |
64 | $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint($isa); |
65 | } |
66 | |
67 | ($isa->is_a_type_of($type)) |
68 | || confess "The type constraint for a $type ($options->{isa}) must be a subtype of $type"; |
69 | } |
70 | } |
71 | |
72 | before '_process_options' => sub { |
73 | my ($self, $name, $options) = @_; |
74 | $self->process_options_for_provides($options, $name); |
75 | }; |
76 | |
77 | ## methods called after instantiation |
78 | |
79 | # this confirms that provides has |
80 | # all valid possibilities in it |
81 | sub check_provides_values { |
82 | my $self = shift; |
83 | |
84 | my $method_constructors = $self->method_constructors; |
85 | |
86 | foreach my $key (keys %{$self->provides}) { |
87 | (exists $method_constructors->{$key}) |
88 | || confess "$key is an unsupported method type"; |
89 | } |
90 | } |
91 | |
92 | after 'install_accessors' => sub { |
93 | my $attr = shift; |
94 | my $class = $attr->associated_class; |
95 | |
96 | # grab the reader and writer methods |
97 | # as well, this will be useful for |
98 | # our method provider constructors |
99 | my $attr_reader = $attr->get_read_method_ref; |
100 | my $attr_writer = $attr->get_write_method_ref; |
101 | |
102 | |
103 | # before we install them, lets |
104 | # make sure they are valid |
105 | $attr->check_provides_values; |
106 | |
107 | my $method_constructors = $attr->method_constructors; |
108 | |
109 | my $class_name = $class->name; |
110 | |
111 | foreach my $key (keys %{$attr->provides}) { |
112 | |
113 | my $method_name = $attr->provides->{$key}; |
114 | |
115 | if ($class->has_method($method_name)) { |
116 | confess "The method ($method_name) already exists in class (" . $class->name . ")"; |
117 | } |
118 | |
119 | my $method = MooseX::AttributeHelpers::Meta::Method::Provided->wrap( |
120 | $method_constructors->{$key}->( |
121 | $attr, |
122 | $attr_reader, |
123 | $attr_writer, |
124 | ), |
125 | package_name => $class_name, |
126 | name => $method_name, |
127 | ); |
128 | |
129 | $attr->associate_method($method); |
130 | $class->add_method($method_name => $method); |
131 | } |
132 | }; |
133 | |
134 | after 'remove_accessors' => sub { |
135 | my $attr = shift; |
136 | my $class = $attr->associated_class; |
137 | foreach my $key (keys %{$attr->provides}) { |
138 | my $method_name = $attr->provides->{$key}; |
139 | my $method = $class->get_method($method_name); |
140 | $class->remove_method($method_name) |
141 | if blessed($method) && |
142 | $method->isa('MooseX::AttributeHelpers::Meta::Method::Provided'); |
143 | } |
144 | }; |
145 | |
146 | no Moose::Role; |
147 | no Moose::Util::TypeConstraints; |
148 | |
149 | 1; |
150 | |