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package Moose::Meta::Attribute::Native::Trait;
use Moose::Role;
use Moose::Util::TypeConstraints;
our $VERSION = '1.09';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
requires '_helper_type';
# these next two are the possible methods you can use in the 'handles'
# map.
# provide a Class or Role which we can collect the method providers
# from
# or you can provide a HASH ref of anon subs yourself. This will also
# collect and store the methods from a method_provider as well
has 'method_constructors' => (
is => 'ro',
isa => 'HashRef',
lazy => 1,
default => sub {
my $self = shift;
return +{} unless $self->has_method_provider;
# or grab them from the role/class
my $method_provider = $self->method_provider->meta;
return +{
map {
$_ => $method_provider->get_method($_)
} $method_provider->get_method_list
};
},
);
# methods called prior to instantiation
before '_process_options' => sub {
my ( $self, $name, $options ) = @_;
$self->_check_helper_type( $options, $name );
$options->{is} = $self->_default_is
if ! exists $options->{is} && $self->can('_default_is');
$options->{default} = $self->_default_default
if ! exists $options->{default} && $self->can('_default_default');
};
sub _check_helper_type {
my ( $self, $options, $name ) = @_;
my $type = $self->_helper_type;
$options->{isa} = $type
unless exists $options->{isa};
my $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint(
$options->{isa} );
( $isa->is_a_type_of($type) )
|| confess
"The type constraint for $name must be a subtype of $type but it's a $isa";
}
around '_canonicalize_handles' => sub {
my $next = shift;
my $self = shift;
my $handles = $self->handles;
return unless $handles;
unless ( 'HASH' eq ref $handles ) {
$self->throw_error(
"The 'handles' option must be a HASH reference, not $handles" );
}
return map {
my $to = $handles->{$_};
$to = [$to] unless ref $to;
$_ => $to
} keys %$handles;
};
# methods called after instantiation
before 'install_accessors' => sub { (shift)->_check_handles_values };
sub _check_handles_values {
my $self = shift;
my $method_constructors = $self->method_constructors;
my %handles = $self->_canonicalize_handles;
for my $original_method ( values %handles ) {
my $name = $original_method->[0];
( exists $method_constructors->{$name} )
|| confess "$name is an unsupported method type";
}
}
around '_make_delegation_method' => sub {
my $next = shift;
my ( $self, $handle_name, $method_to_call ) = @_;
my ( $name, @curried_args ) = @$method_to_call;
my $method_constructors = $self->method_constructors;
my $code = $method_constructors->{$name}->(
$self,
$self->get_read_method_ref,
$self->get_write_method_ref,
);
return $next->(
$self,
$handle_name,
sub {
my $instance = shift;
return $code->( $instance, @curried_args, @_ );
},
);
};
no Moose::Role;
no Moose::Util::TypeConstraints;
1;
__END__
=head1 NAME
Moose::Meta::Attribute::Native::Trait - Base role for helpers
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 SEE ALSO
Documentation for Moose native traits starts at L<Moose::Meta::Attribute Native>
=head1 AUTHORS
Yuval Kogman
Shawn M Moore
Jesse Luehrs
=head1 COPYRIGHT AND LICENSE
Copyright 2007-2009 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
