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1 | |
2 | package Moose::Meta::TypeCoercion::Union; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
8 | use Carp 'confess'; |
9 | use Scalar::Util 'blessed'; |
10 | |
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11 | our $VERSION = '0.51'; |
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12 | our $AUTHORITY = 'cpan:STEVAN'; |
13 | |
14 | use base 'Moose::Meta::TypeCoercion'; |
15 | |
16 | sub compile_type_coercion { |
17 | my $self = shift; |
18 | my $type_constraint = $self->type_constraint; |
19 | |
20 | (blessed $type_constraint && $type_constraint->isa('Moose::Meta::TypeConstraint::Union')) |
21 | || confess "You can only a Moose::Meta::TypeCoercion::Union for a " . |
22 | "Moose::Meta::TypeConstraint::Union, not a $type_constraint"; |
23 | |
24 | $self->_compiled_type_coercion(sub { |
25 | my $value = shift; |
26 | # go through all the type constraints |
27 | # in the union, and check em ... |
28 | foreach my $type (@{$type_constraint->type_constraints}) { |
29 | # if they have a coercion first |
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30 | if ($type->has_coercion) { |
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31 | # then try to coerce them ... |
32 | my $temp = $type->coerce($value); |
33 | # and if they get something |
34 | # make sure it still fits within |
35 | # the union type ... |
36 | return $temp if $type_constraint->check($temp); |
37 | } |
38 | } |
39 | return undef; |
40 | }); |
41 | } |
42 | |
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43 | sub has_coercion_for_type { 0 } |
44 | |
45 | sub add_type_coercions { |
46 | confess "Cannot add additional type coercions to Union types"; |
47 | } |
48 | |
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49 | 1; |
50 | |
51 | __END__ |
52 | |
53 | =pod |
54 | |
55 | =head1 NAME |
56 | |
57 | Moose::Meta::TypeCoercion::Union - The Moose Type Coercion metaclass for Unions |
58 | |
59 | =head1 DESCRIPTION |
60 | |
61 | For the most part, the only time you will ever encounter an |
62 | instance of this class is if you are doing some serious deep |
63 | introspection. This API should not be considered final, but |
64 | it is B<highly unlikely> that this will matter to a regular |
65 | Moose user. |
66 | |
67 | If you wish to use features at this depth, please come to the |
68 | #moose IRC channel on irc.perl.org and we can talk :) |
69 | |
70 | =head1 METHODS |
71 | |
72 | =over 4 |
73 | |
74 | =item B<meta> |
75 | |
76 | =item B<compile_type_coercion> |
77 | |
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78 | =item B<has_coercion_for_type> |
79 | |
80 | =item B<add_type_coercions> |
81 | |
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82 | =back |
83 | |
84 | =head1 BUGS |
85 | |
86 | All complex software has bugs lurking in it, and this module is no |
87 | exception. If you find a bug please either email me, or add the bug |
88 | to cpan-RT. |
89 | |
90 | =head1 AUTHOR |
91 | |
92 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
93 | |
94 | =head1 COPYRIGHT AND LICENSE |
95 | |
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96 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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97 | |
98 | L<http://www.iinteractive.com> |
99 | |
100 | This library is free software; you can redistribute it and/or modify |
101 | it under the same terms as Perl itself. |
102 | |
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103 | =cut |