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1 | package Mouse::Object; |
2 | use strict; |
3 | use warnings; |
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4 | |
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5 | use Scalar::Util 'weaken'; |
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6 | use Carp 'confess'; |
7 | |
8 | sub new { |
9 | my $class = shift; |
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10 | |
11 | my $args = $class->BUILDARGS(@_); |
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12 | |
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13 | my $instance = bless {}, $class; |
14 | |
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15 | for my $attribute ($class->meta->compute_all_applicable_attributes) { |
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16 | my $from = $attribute->init_arg; |
17 | my $key = $attribute->name; |
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18 | |
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19 | if (defined($from) && exists($args->{$from})) { |
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20 | $args->{$from} = $attribute->coerce_constraint($args->{$from}) |
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21 | if $attribute->should_coerce; |
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22 | $attribute->verify_type_constraint($args->{$from}) |
23 | if $attribute->has_type_constraint; |
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24 | |
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25 | $instance->{$key} = $args->{$from}; |
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26 | |
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27 | weaken($instance->{$key}) |
28 | if ref($instance->{$key}) && $attribute->is_weak_ref; |
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29 | |
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30 | if ($attribute->has_trigger) { |
31 | $attribute->trigger->($instance, $args->{$from}, $attribute); |
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32 | } |
33 | } |
34 | else { |
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35 | if ($attribute->has_default || $attribute->has_builder) { |
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36 | unless ($attribute->is_lazy) { |
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37 | my $default = $attribute->default; |
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38 | my $builder = $attribute->builder; |
39 | my $value = $attribute->has_builder |
40 | ? $instance->$builder |
41 | : ref($default) eq 'CODE' |
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42 | ? $default->($instance) |
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43 | : $default; |
44 | |
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45 | $value = $attribute->coerce_constraint($value) |
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46 | if $attribute->should_coerce; |
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47 | $attribute->verify_type_constraint($value) |
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48 | if $attribute->has_type_constraint; |
49 | |
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50 | $instance->{$key} = $value; |
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51 | |
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52 | weaken($instance->{$key}) |
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53 | if ref($instance->{$key}) && $attribute->is_weak_ref; |
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54 | } |
55 | } |
56 | else { |
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57 | if ($attribute->is_required) { |
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58 | confess "Attribute (".$attribute->name.") is required"; |
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59 | } |
60 | } |
61 | } |
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62 | } |
63 | |
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64 | $instance->BUILDALL($args); |
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65 | |
66 | return $instance; |
67 | } |
68 | |
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69 | sub BUILDARGS { |
70 | my $class = shift; |
71 | |
72 | if (scalar @_ == 1) { |
73 | if (defined $_[0]) { |
74 | (ref($_[0]) eq 'HASH') |
75 | || confess "Single parameters to new() must be a HASH ref"; |
76 | return {%{$_[0]}}; |
77 | } else { |
78 | return {}; |
79 | } |
80 | } |
81 | else { |
82 | return {@_}; |
83 | } |
84 | } |
85 | |
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86 | sub DESTROY { shift->DEMOLISHALL } |
87 | |
88 | sub BUILDALL { |
89 | my $self = shift; |
90 | |
91 | # short circuit |
92 | return unless $self->can('BUILD'); |
93 | |
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94 | for my $class (reverse $self->meta->linearized_isa) { |
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95 | no strict 'refs'; |
96 | no warnings 'once'; |
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97 | my $code = *{ $class . '::BUILD' }{CODE} |
98 | or next; |
99 | $code->($self, @_); |
100 | } |
101 | } |
102 | |
103 | sub DEMOLISHALL { |
104 | my $self = shift; |
105 | |
106 | # short circuit |
107 | return unless $self->can('DEMOLISH'); |
108 | |
109 | no strict 'refs'; |
110 | |
111 | for my $class ($self->meta->linearized_isa) { |
112 | my $code = *{ $class . '::DEMOLISH' }{CODE} |
113 | or next; |
114 | $code->($self, @_); |
115 | } |
116 | } |
117 | |
118 | 1; |
119 | |
120 | __END__ |
121 | |
122 | =head1 NAME |
123 | |
124 | Mouse::Object - we don't need to steenkin' constructor |
125 | |
126 | =head1 METHODS |
127 | |
128 | =head2 new arguments -> object |
129 | |
130 | Instantiates a new Mouse::Object. This is obviously intended for subclasses. |
131 | |
132 | =head2 BUILDALL \%args |
133 | |
134 | Calls L</BUILD> on each class in the class hierarchy. This is called at the |
135 | end of L</new>. |
136 | |
137 | =head2 BUILD \%args |
138 | |
139 | You may put any business logic initialization in BUILD methods. You don't |
140 | need to redispatch or return any specific value. |
141 | |
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142 | =head2 BUILDARGS |
143 | |
144 | Lets you override the arguments that C<new> takes. Return a hashref of |
145 | parameters. |
146 | |
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147 | =head2 DEMOLISHALL |
148 | |
149 | Calls L</DEMOLISH> on each class in the class hierarchy. This is called at |
150 | L</DESTROY> time. |
151 | |
152 | =head2 DEMOLISH |
153 | |
154 | You may put any business logic deinitialization in DEMOLISH methods. You don't |
155 | need to redispatch or return any specific value. |
156 | |
157 | =cut |
158 | |