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 |
24 | has 'method_provider' => ( |
25 | is => 'ro', |
26 | isa => 'ClassName', |
27 | predicate => 'has_method_provider', |
28 | ); |
29 | |
30 | # or you can provide a HASH ref of anon subs |
31 | # yourself. This will also collect and store |
32 | # the methods from a method_provider as well |
33 | has 'method_constructors' => ( |
34 | is => 'ro', |
35 | isa => 'HashRef', |
36 | lazy => 1, |
37 | default => sub { |
38 | my $self = shift; |
39 | return +{} unless $self->has_method_provider; |
40 | # or grab them from the role/class |
41 | my $method_provider = $self->method_provider->meta; |
42 | return +{ |
43 | map { |
44 | $_ => $method_provider->get_method($_) |
45 | } $method_provider->get_method_list |
46 | }; |
47 | }, |
48 | ); |
49 | |
50 | # extend the parents stuff to make sure |
51 | # certain bits are now required ... |
52 | has '+$!default' => (required => 1); |
53 | has '+type_constraint' => (required => 1); |
54 | |
55 | ## Methods called prior to instantiation |
56 | |
57 | sub process_options_for_provides { |
58 | my ($self, $options) = @_; |
59 | |
60 | if (my $type = $self->helper_type) { |
61 | (exists $options->{isa}) |
62 | || confess "You must define a type with the $type metaclass"; |
63 | |
64 | my $isa = $options->{isa}; |
65 | |
66 | unless (blessed($isa) && $isa->isa('Moose::Meta::TypeConstraint')) { |
67 | $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint($isa); |
68 | } |
69 | |
70 | ($isa->is_a_type_of($type)) |
71 | || confess "The type constraint for a $type ($options->{isa}) must be a subtype of $type"; |
72 | } |
73 | } |
74 | |
75 | before '_process_options' => sub { |
76 | my ($self, $name, $options) = @_; |
77 | $self->process_options_for_provides($options, $name); |
78 | }; |
79 | |
80 | ## methods called after instantiation |
81 | |
82 | # this confirms that provides has |
83 | # all valid possibilities in it |
84 | sub check_provides_values { |
85 | my $self = shift; |
86 | |
87 | my $method_constructors = $self->method_constructors; |
88 | |
89 | foreach my $key (keys %{$self->provides}) { |
90 | (exists $method_constructors->{$key}) |
91 | || confess "$key is an unsupported method type"; |
92 | } |
93 | } |
94 | |
95 | after 'install_accessors' => sub { |
96 | my $attr = shift; |
97 | my $class = $attr->associated_class; |
98 | |
99 | # grab the reader and writer methods |
100 | # as well, this will be useful for |
101 | # our method provider constructors |
102 | my $attr_reader = $attr->get_read_method_ref; |
103 | my $attr_writer = $attr->get_write_method_ref; |
104 | |
105 | |
106 | # before we install them, lets |
107 | # make sure they are valid |
108 | $attr->check_provides_values; |
109 | |
110 | my $method_constructors = $attr->method_constructors; |
111 | |
112 | my $class_name = $class->name; |
113 | |
114 | foreach my $key (keys %{$attr->provides}) { |
115 | |
116 | my $method_name = $attr->provides->{$key}; |
117 | |
118 | if ($class->has_method($method_name)) { |
119 | confess "The method ($method_name) already exists in class (" . $class->name . ")"; |
120 | } |
121 | |
122 | my $method = MooseX::AttributeHelpers::Meta::Method::Provided->wrap( |
123 | $method_constructors->{$key}->( |
124 | $attr, |
125 | $attr_reader, |
126 | $attr_writer, |
127 | ), |
128 | package_name => $class_name, |
129 | name => $method_name, |
130 | ); |
131 | |
132 | $attr->associate_method($method); |
133 | $class->add_method($method_name => $method); |
134 | } |
135 | }; |
136 | |
137 | after 'remove_accessors' => sub { |
138 | my $attr = shift; |
139 | my $class = $attr->associated_class; |
140 | foreach my $key (keys %{$attr->provides}) { |
141 | my $method_name = $attr->provides->{$key}; |
142 | my $method = $class->get_method($method_name); |
143 | $class->remove_method($method_name) |
144 | if blessed($method) && |
145 | $method->isa('MooseX::AttributeHelpers::Meta::Method::Provided'); |
146 | } |
147 | }; |
148 | |
149 | no Moose::Role; |
150 | no Moose::Util::TypeConstraints; |
151 | |
152 | 1; |
153 | |