use strict;
use warnings;
+do {
+ my %METACLASS_CACHE;
+
+ # because Mouse doesn't introspect existing classes, we're forced to
+ # only pay attention to other Mouse classes
+ sub _metaclass_cache {
+ my $class = shift;
+ my $name = shift;
+ return $METACLASS_CACHE{$name};
+ }
+
+ sub initialize {
+ my $class = shift;
+ my $name = shift;
+ $METACLASS_CACHE{$name} = $class->new(name => $name)
+ if !exists($METACLASS_CACHE{$name});
+ return $METACLASS_CACHE{$name};
+ }
+};
+
+sub new {
+ my $class = shift;
+ my %args = @_;
+
+ $args{attributes} ||= {};
+
+ bless \%args, $class;
+}
+
+sub name { $_[0]->{name} }
+
+sub add_attribute {
+ my $self = shift;
+ my $name = shift;
+ my $spec = shift;
+ $self->{attributes}->{$name} = $spec;
+}
+
+sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
+sub get_attribute_list { keys %{ $_[0]->{attributes} } }
+sub get_attribute { $_[0]->{attributes}->{$_[1]} }
+
+sub apply {
+ my $self = shift;
+ my $class = shift;
+ my $pkg = $class->name;
+
+ for my $name ($self->get_attribute_list) {
+ next if $class->has_attribute($name);
+ my $spec = $self->get_attribute($name);
+ Mouse::Meta::Attribute->create($pkg, $name, %$spec);
+ }
+}
1;