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package Moose::Meta::TypeCoercion::Union;
use strict;
use warnings;
use metaclass;
use Scalar::Util 'blessed';
our $VERSION = '1.09';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::TypeCoercion';
sub compile_type_coercion {
my $self = shift;
my $type_constraint = $self->type_constraint;
(blessed $type_constraint && $type_constraint->isa('Moose::Meta::TypeConstraint::Union'))
|| Moose->throw_error("You can only a Moose::Meta::TypeCoercion::Union for a " .
"Moose::Meta::TypeConstraint::Union, not a $type_constraint");
$self->_compiled_type_coercion(sub {
my $value = shift;
# go through all the type constraints
# in the union, and check em ...
foreach my $type (@{$type_constraint->type_constraints}) {
# if they have a coercion first
if ($type->has_coercion) {
# then try to coerce them ...
my $temp = $type->coerce($value);
# and if they get something
# make sure it still fits within
# the union type ...
return $temp if $type_constraint->check($temp);
}
}
return undef;
});
}
sub has_coercion_for_type { 0 }
sub add_type_coercions {
require Moose;
Moose->throw_error("Cannot add additional type coercions to Union types");
}
1;
__END__
=pod
=head1 NAME
Moose::Meta::TypeCoercion::Union - The Moose Type Coercion metaclass for Unions
=head1 DESCRIPTION
This is a subclass of L<Moose::Meta::TypeCoercion> that is used for
L<Moose::Meta::TypeConstraint::Union> objects.
=head1 METHODS
=over 4
=item B<< $coercion->has_coercion_for_type >>
This method always returns false.
=item B<< $coercion->add_type_coercions >>
This method always throws an error. You cannot add coercions to a
union type coercion.
=item B<< $coercion->coerce($value) >>
This method will coerce by trying the coercions for each type in the
union.
=back
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Stevan Little E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 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
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