Ensure that "has '+nonexistent'" fails
[gitmo/Mouse.git] / lib / Mouse / Meta / Class.pm
CommitLineData
c3398f5b 1#!/usr/bin/env perl
306290e8 2package Mouse::Meta::Class;
c3398f5b 3use strict;
4use warnings;
5
72b88a88 6use Scalar::Util 'blessed';
7a59f4e8 7use Carp 'confess';
72b88a88 8
c3398f5b 9use MRO::Compat;
10
11do {
12 my %METACLASS_CACHE;
72b88a88 13
14 # because Mouse doesn't introspect existing classes, we're forced to
15 # only pay attention to other Mouse classes
16 sub _metaclass_cache {
17 my $class = shift;
18 my $name = shift;
19 return $METACLASS_CACHE{$name};
20 }
21
c3398f5b 22 sub initialize {
23 my $class = shift;
24 my $name = shift;
25 $METACLASS_CACHE{$name} = $class->new(name => $name)
26 if !exists($METACLASS_CACHE{$name});
27 return $METACLASS_CACHE{$name};
28 }
29};
30
31sub new {
32 my $class = shift;
6cbacbf6 33 my %args = @_;
c3398f5b 34
35 $args{attributes} = {};
36 $args{superclasses} = do {
37 no strict 'refs';
38 \@{ $args{name} . '::ISA' };
39 };
40
41 bless \%args, $class;
42}
43
44sub name { $_[0]->{name} }
45
46sub superclasses {
47 my $self = shift;
48
49 if (@_) {
50 Mouse::load_class($_) for @_;
51 @{ $self->{superclasses} } = @_;
52 }
53
54 @{ $self->{superclasses} };
55}
56
57sub add_attribute {
58 my $self = shift;
59 my $attr = shift;
60
61 $self->{'attributes'}{$attr->name} = $attr;
62}
63
72b88a88 64sub compute_all_applicable_attributes {
65 my $self = shift;
66 my (@attr, %seen);
67
68 for my $class ($self->linearized_isa) {
69 my $meta = $self->_metaclass_cache($class)
70 or next;
71
72 for my $name (keys %{ $meta->get_attribute_map }) {
73 next if $seen{$name}++;
74 push @attr, $meta->get_attribute($name);
75 }
76 }
77
78 return @attr;
79}
80
c3398f5b 81sub get_attribute_map { $_[0]->{attributes} }
66eea168 82sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
c3398f5b 83sub get_attribute { $_[0]->{attributes}->{$_[1]} }
84
85sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } }
86
7a59f4e8 87sub clone_object {
88 my $class = shift;
89 my $instance = shift;
90
91 (blessed($instance) && $instance->isa($class->name))
92 || confess "You must pass an instance ($instance) of the metaclass (" . $class->name . ")";
93
94 $class->clone_instance($instance, @_);
95}
96
97sub clone_instance {
98 my ($class, $instance, %params) = @_;
99
100 (blessed($instance))
101 || confess "You can only clone instances, \$self is not a blessed instance";
102
103 my $clone = bless { %$instance }, ref $instance;
104
105 foreach my $attr ($class->compute_all_applicable_attributes()) {
106 if ( defined( my $init_arg = $attr->init_arg ) ) {
107 if (exists $params{$init_arg}) {
108 $clone->{ $attr->name } = $params{$init_arg};
109 }
110 }
111 }
112
113 return $clone;
114
115}
116
117
c3398f5b 1181;
119
120__END__
121
122=head1 NAME
123
306290e8 124Mouse::Meta::Class - hook into the Mouse MOP
c3398f5b 125
126=head1 METHODS
127
306290e8 128=head2 initialize ClassName -> Mouse::Meta::Class
c3398f5b 129
306290e8 130Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only
131one instance should exist for a given class.
c3398f5b 132
306290e8 133=head2 new %args -> Mouse::Meta::Class
c3398f5b 134
306290e8 135Creates a new Mouse::Meta::Class. Don't call this directly.
c3398f5b 136
137=head2 name -> ClassName
138
139Returns the name of the owner class.
140
141=head2 superclasses -> [ClassName]
142
143Gets (or sets) the list of superclasses of the owner class.
144
306290e8 145=head2 add_attribute Mouse::Meta::Attribute
c3398f5b 146
306290e8 147Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
148class.
c3398f5b 149
72b88a88 150=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
151
152Returns the list of all L<Mouse::Meta::Attribute> instances associated with
153this class and its superclasses.
154
306290e8 155=head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
c3398f5b 156
157Returns a mapping of attribute names to their corresponding
306290e8 158L<Mouse::Meta::Attribute> objects.
c3398f5b 159
66eea168 160=head2 has_attribute Name -> Boool
161
162Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
163
306290e8 164=head2 get_attribute Name -> Mouse::Meta::Attribute | undef
c3398f5b 165
306290e8 166Returns the L<Mouse::Meta::Attribute> with the given name.
c3398f5b 167
168=head2 linearized_isa -> [ClassNames]
169
170Returns the list of classes in method dispatch order, with duplicates removed.
171
172=cut
173