--- /dev/null
+package Class::MOP::Mixin::HasMethods;
+
+use strict;
+use warnings;
+
+use Class::MOP::Method::Meta;
+
+our $AUTHORITY = 'cpan:STEVAN';
+
+use Scalar::Util 'blessed';
+use Carp 'confess';
+use Sub::Name 'subname';
+
+use base 'Class::MOP::Mixin';
+
+sub _meta_method_class { 'Class::MOP::Method::Meta' }
+
+sub _add_meta_method {
+ my $self = shift;
+ my ($name) = @_;
+ my $existing_method = $self->can('find_method_by_name')
+ ? $self->find_method_by_name($name)
+ : $self->get_method($name);
+ return if $existing_method
+ && $existing_method->isa($self->_meta_method_class);
+ $self->add_method(
+ $name => $self->_meta_method_class->wrap(
+ name => $name,
+ package_name => $self->name,
+ associated_metaclass => $self,
+ )
+ );
+}
+
+sub wrap_method_body {
+ my ( $self, %args ) = @_;
+
+ ( 'CODE' eq ref $args{body} )
+ || confess "Your code block must be a CODE reference";
+
+ $self->method_metaclass->wrap(
+ package_name => $self->name,
+ %args,
+ );
+}
+
+sub add_method {
+ my ( $self, $method_name, $method ) = @_;
+ ( defined $method_name && length $method_name )
+ || confess "You must define a method name";
+
+ my $package_name = $self->name;
+
+ my $body;
+ if ( blessed($method) ) {
+ $body = $method->body;
+ if ( $method->package_name ne $package_name ) {
+ $method = $method->clone(
+ package_name => $package_name,
+ name => $method_name,
+ );
+ }
+
+ $method->attach_to_class($self);
+ }
+ else {
+ # If a raw code reference is supplied, its method object is not created.
+ # The method object won't be created until required.
+ $body = $method;
+ }
+
+ $self->_method_map->{$method_name} = $method;
+
+ my ($current_package, $current_name) = Class::MOP::get_code_info($body);
+
+ subname($package_name . '::' . $method_name, $body)
+ unless defined $current_name && $current_name !~ /^__ANON__/;
+
+ $self->add_package_symbol("&$method_name", $body);
+
+ # we added the method to the method map too, so it's still valid
+ $self->update_package_cache_flag;
+}
+
+sub _code_is_mine {
+ my ( $self, $code ) = @_;
+
+ my ( $code_package, $code_name ) = Class::MOP::get_code_info($code);
+
+ return ( $code_package && $code_package eq $self->name )
+ || ( $code_package eq 'constant' && $code_name eq '__ANON__' );
+}
+
+sub has_method {
+ my ( $self, $method_name ) = @_;
+
+ ( defined $method_name && length $method_name )
+ || confess "You must define a method name";
+
+ my $method = $self->_get_maybe_raw_method($method_name)
+ or return;
+
+ return defined($self->_method_map->{$method_name} = $method);
+}
+
+sub get_method {
+ my ( $self, $method_name ) = @_;
+
+ ( defined $method_name && length $method_name )
+ || confess "You must define a method name";
+
+ my $method = $self->_get_maybe_raw_method($method_name)
+ or return;
+
+ return $method if blessed $method;
+
+ return $self->_method_map->{$method_name} = $self->wrap_method_body(
+ body => $method,
+ name => $method_name,
+ associated_metaclass => $self,
+ );
+}
+
+sub _get_maybe_raw_method {
+ my ( $self, $method_name ) = @_;
+
+ my $map_entry = $self->_method_map->{$method_name};
+ return $map_entry if defined $map_entry;
+
+ my $code = $self->get_package_symbol("&$method_name");
+
+ return unless $code && $self->_code_is_mine($code);
+
+ return $code;
+}
+
+sub remove_method {
+ my ( $self, $method_name ) = @_;
+
+ ( defined $method_name && length $method_name )
+ || confess "You must define a method name";
+
+ my $removed_method = delete $self->_method_map->{$method_name};
+
+ $self->remove_package_symbol("&$method_name");
+
+ $removed_method->detach_from_class
+ if blessed($removed_method);
+
+ # still valid, since we just removed the method from the map
+ $self->update_package_cache_flag;
+
+ return $removed_method;
+}
+
+sub get_method_list {
+ my $self = shift;
+
+ return keys %{ $self->_full_method_map };
+}
+
+sub _get_local_methods {
+ my $self = shift;
+
+ return values %{ $self->_full_method_map };
+}
+
+sub _restore_metamethods_from {
+ my $self = shift;
+ my ($old_meta) = @_;
+
+ for my $method ($old_meta->_get_local_methods) {
+ $method->_make_compatible_with($self->method_metaclass);
+ $self->add_method($method->name => $method);
+ }
+}
+
+sub reset_package_cache_flag { (shift)->{'_package_cache_flag'} = undef }
+sub update_package_cache_flag {
+ my $self = shift;
+ # NOTE:
+ # we can manually update the cache number
+ # since we are actually adding the method
+ # to our cache as well. This avoids us
+ # having to regenerate the method_map.
+ # - SL
+ $self->{'_package_cache_flag'} = Class::MOP::check_package_cache_flag($self->name);
+}
+
+sub _full_method_map {
+ my $self = shift;
+
+ my $pkg_gen = Class::MOP::check_package_cache_flag($self->name);
+
+ if (($self->{_package_cache_flag_full} || -1) != $pkg_gen) {
+ # forcibly reify all method map entries
+ $self->get_method($_)
+ for $self->list_all_package_symbols('CODE');
+ $self->{_package_cache_flag_full} = $pkg_gen;
+ }
+
+ return $self->_method_map;
+}
+
+1;
+
+# ABSTRACT: Methods for metaclasses which have methods
+
+__END__
+
+=pod
+
+=head1 DESCRIPTION
+
+This class implements methods for metaclasses which have methods
+(L<Class::MOP::Package> and L<Moose::Meta::Role>). See L<Class::MOP::Package>
+for API details.
+
+=cut
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