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1 | package Class::MOP::Class::Immutable::Trait; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use MRO::Compat; |
7 | |
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8 | use Carp 'confess'; |
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9 | use Scalar::Util 'blessed', 'weaken'; |
10 | |
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11 | our $VERSION = '0.88'; |
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12 | $VERSION = eval $VERSION; |
13 | our $AUTHORITY = 'cpan:STEVAN'; |
14 | |
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15 | # the original class of the metaclass instance |
16 | sub get_mutable_metaclass_name { $_[0]{__immutable}{original_class} } |
17 | |
18 | sub immutable_options { %{ $_[0]{__immutable}{options} } } |
19 | |
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20 | sub is_mutable { 0 } |
21 | sub is_immutable { 1 } |
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22 | |
23 | sub superclasses { |
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24 | my $orig = shift; |
25 | my $self = shift; |
26 | confess "This method is read-only" if @_; |
27 | $self->$orig; |
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28 | } |
29 | |
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30 | sub _immutable_cannot_call { |
31 | Carp::confess "This method cannot be called on an immutable instance"; |
32 | } |
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33 | |
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34 | sub add_method { _immutable_cannot_call() } |
35 | sub alias_method { _immutable_cannot_call() } |
36 | sub remove_method { _immutable_cannot_call() } |
37 | sub add_attribute { _immutable_cannot_call() } |
38 | sub remove_attribute { _immutable_cannot_call() } |
39 | sub remove_package_symbol { _immutable_cannot_call() } |
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40 | |
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41 | sub class_precedence_list { |
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42 | my $orig = shift; |
43 | my $self = shift; |
44 | @{ $self->{__immutable}{class_precedence_list} |
45 | ||= [ $self->$orig ] }; |
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46 | } |
47 | |
48 | sub linearized_isa { |
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49 | my $orig = shift; |
50 | my $self = shift; |
51 | @{ $self->{__immutable}{linearized_isa} ||= [ $self->$orig ] }; |
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52 | } |
53 | |
54 | sub get_all_methods { |
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55 | my $orig = shift; |
56 | my $self = shift; |
57 | @{ $self->{__immutable}{get_all_methods} ||= [ $self->$orig ] }; |
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58 | } |
59 | |
60 | sub get_all_method_names { |
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61 | my $orig = shift; |
62 | my $self = shift; |
63 | @{ $self->{__immutable}{get_all_method_names} ||= [ $self->$orig ] }; |
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64 | } |
65 | |
66 | sub get_all_attributes { |
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67 | my $orig = shift; |
68 | my $self = shift; |
69 | @{ $self->{__immutable}{get_all_attributes} ||= [ $self->$orig ] }; |
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70 | } |
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71 | |
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72 | sub get_meta_instance { |
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73 | my $orig = shift; |
74 | my $self = shift; |
75 | $self->{__immutable}{get_meta_instance} ||= $self->$orig; |
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76 | } |
77 | |
78 | sub get_method_map { |
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79 | my $orig = shift; |
80 | my $self = shift; |
81 | $self->{__immutable}{get_method_map} ||= $self->$orig; |
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82 | } |
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83 | |
84 | sub add_package_symbol { |
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85 | my $orig = shift; |
86 | my $self = shift; |
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87 | confess "Cannot add package symbols to an immutable metaclass" |
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88 | unless ( caller(3) )[3] eq 'Class::MOP::Package::get_package_symbol'; |
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89 | |
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90 | $self->$orig(@_); |
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91 | } |
92 | |
93 | 1; |
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94 | |
95 | __END__ |
96 | |
97 | =pod |
98 | |
99 | =head1 NAME |
100 | |
101 | Class::MOP::Class::Immutable::Trait - Implements immutability for metaclass objects |
102 | |
103 | =head1 DESCRIPTION |
104 | |
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105 | This class provides a pseudo-trait that is applied to immutable metaclass |
106 | objects. In reality, it is simply a parent class. |
107 | |
108 | It implements caching and read-only-ness for various metaclass methods. |
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109 | |
110 | =head1 AUTHOR |
111 | |
112 | Yuval Kogman E<lt>nothingmuch@cpan.orgE<gt> |
113 | |
114 | =head1 COPYRIGHT AND LICENSE |
115 | |
116 | Copyright 2009 by Infinity Interactive, Inc. |
117 | |
118 | L<http://www.iinteractive.com> |
119 | |
120 | This library is free software; you can redistribute it and/or modify |
121 | it under the same terms as Perl itself. |
122 | |
123 | =cut |
124 | |