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package UR::Role::MethodModifier;
use strict;
use warnings;
our $VERSION = "0.47"; # UR $VERSION
use Carp;
use Sub::Install;
my $idx = 1;
UR::Object::Type->define(
class_name => 'UR::Role::MethodModifier',
is_abstract => 1,
id_by => [
idx => { is => 'Integer' },
],
has => [
name => { is => 'String' },
code => { is => 'CODE' },
role_name => { is => 'String' },
role => { is => 'UR::Role::Prototype', id_by => 'role_name' },
type => { is => 'String' },
],
id_generator => sub { $idx++ },
);
sub type {
my $class = ref(shift);
Carp::croak("Class $class didn't define sub type");
}
sub apply_to_package {
my($self, $package) = @_;
my $original_sub = $self->_get_original_sub($package);
unless ($original_sub) {
my $name = $self->name;
Carp::croak(qq(Cannot apply 'before' modifier to $name: Can't locate method "$name" via package $package));
}
my $wrapper = $self->create_wrapper_sub($original_sub);
my $fully_qualified_sub_name = join('::', $package, $self->name);
$self->_install_sub($package, $wrapper);
}
sub _get_original_sub {
my($self, $package) = @_;
my $fully_qualified_subname = join('::', $package, $self->name);
my $subref = do { no strict 'refs'; exists &$fully_qualified_subname and \&$fully_qualified_subname }
|| $package->super_can($self->name);
return $subref;
}
sub _install_sub {
my($self, $package, $code) = @_;
Sub::Install::reinstall_sub({
into => $package,
as => $self->name,
code => $code,
});
}
1;
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