2 package Moose::Meta::TypeConstraint::Union;
8 use Moose::Meta::TypeCoercion::Union;
10 use List::Util qw(first);
12 our $VERSION = '1.10';
13 $VERSION = eval $VERSION;
14 our $AUTHORITY = 'cpan:STEVAN';
16 use base 'Moose::Meta::TypeConstraint';
18 __PACKAGE__->meta->add_attribute('type_constraints' => (
19 accessor => 'type_constraints',
24 my ($class, %options) = @_;
26 my $name = join '|' => sort { $a cmp $b }
27 map { $_->name } @{ $options{type_constraints} };
29 my $self = $class->SUPER::new(
34 $self->_set_constraint(sub { $self->check($_[0]) });
36 if ( grep { $_->has_coercion } @{ $self->type_constraints } ) {
38 Moose::Meta::TypeCoercion::Union->new( type_constraint => $self )
45 sub _actually_compile_type_constraint {
48 my @constraints = @{ $self->type_constraints };
52 foreach my $type (@constraints) {
53 return 1 if $type->check($value);
61 my ( $self, $type_or_name ) = @_;
63 my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
65 return unless $other->isa(__PACKAGE__);
67 my @self_constraints = @{ $self->type_constraints };
68 my @other_constraints = @{ $other->type_constraints };
70 return unless @self_constraints == @other_constraints;
72 # FIXME presort type constraints for efficiency?
73 constraint: foreach my $constraint ( @self_constraints ) {
74 for ( my $i = 0; $i < @other_constraints; $i++ ) {
75 if ( $constraint->equals($other_constraints[$i]) ) {
76 splice @other_constraints, $i, 1;
82 return @other_constraints == 0;
87 $self->type_constraints;
91 my ($self, $value) = @_;
93 foreach my $type (@{$self->type_constraints}) {
94 my $err = $type->validate($value);
95 return unless defined $err;
96 $message .= ($message ? ' and ' : '') . $err
99 return ($message . ' in (' . $self->name . ')') ;
103 my ($self, $value) = @_;
105 return first { $_->check($value) } @{ $self->type_constraints };
109 my ($self, $type_name) = @_;
110 foreach my $type (@{$self->type_constraints}) {
111 return 1 if $type->is_a_type_of($type_name);
117 my ($self, $type_name) = @_;
118 foreach my $type (@{$self->type_constraints}) {
119 return 1 if $type->is_subtype_of($type_name);
124 sub create_child_type {
125 my ( $self, %opts ) = @_;
128 = Moose::Meta::TypeConstraint->new( %opts, parent => $self );
130 # if we have a type constraint union, and no
131 # type check, this means we are just aliasing
132 # the union constraint, which means we need to
133 # handle this differently.
135 if ( not( defined $opts{constraint} )
136 && $self->has_coercion ) {
137 $constraint->coercion(
138 Moose::Meta::TypeCoercion::Union->new(
139 type_constraint => $self,
155 Moose::Meta::TypeConstraint::Union - A union of Moose type constraints
159 This metaclass represents a union of type constraints. A union takes
160 multiple type constraints, and is true if any one of its member
165 C<Moose::Meta::TypeConstraint::Union> is a subclass of
166 L<Moose::Meta::TypeConstraint>.
170 =item B<< Moose::Meta::TypeConstraint::Union->new(%options) >>
172 This creates a new class type constraint based on the given
175 It takes the same options as its parent. It also requires an
176 additional option, C<type_constraints>. This is an array reference
177 containing the L<Moose::Meta::TypeConstraint> objects that are the
178 members of the union type. The C<name> option defaults to the names
179 all of these member types sorted and then joined by a pipe (|).
181 The constructor sets the implementation of the constraint so that is
182 simply calls C<check> on the newly created object.
184 Finally, the constructor also makes sure that the object's C<coercion>
185 attribute is a L<Moose::Meta::TypeCoercion::Union> object.
187 =item B<< $constraint->type_constraints >>
189 This returns the array reference of C<type_constraints> provided to
192 =item B<< $constraint->parents >>
194 This returns the same constraint as the C<type_constraints> method.
196 =item B<< $constraint->check($value) >>
198 =item B<< $constraint->validate($value) >>
200 These two methods simply call the relevant method on each of the
201 member type constraints in the union. If any type accepts the value,
204 With C<validate> the error message returned includes all of the error
205 messages returned by the member type constraints.
207 =item B<< $constraint->equals($type_name_or_object) >>
209 A type is considered equal if it is also a union type, and the two
210 unions have the same member types.
212 =item B<< $constraint->find_type_for($value) >>
214 This returns the first member type constraint for which C<check($value)> is
215 true, allowing you to determine which of the Union's member type constraints
216 a given value matches.
218 =item B<< $constraint->is_a_type_of($type_name_or_object) >>
220 This returns true if any of the member type constraints return true
221 for the C<is_a_type_of> method.
223 =item B<< $constraint->is_subtype_of >>
225 This returns true if any of the member type constraints return true
226 for the C<is_a_subtype_of> method.
228 =item B<< $constraint->create_child_type(%options) >>
230 This returns a new L<Moose::Meta::TypeConstraint> object with the type
237 See L<Moose/BUGS> for details on reporting bugs.
241 Stevan Little E<lt>stevan@iinteractive.comE<gt>
243 =head1 COPYRIGHT AND LICENSE
245 Copyright 2006-2010 by Infinity Interactive, Inc.
247 L<http://www.iinteractive.com>
249 This library is free software; you can redistribute it and/or modify
250 it under the same terms as Perl itself.