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1 | #!/usr/bin/perl |
| 2 | |
| 3 | use strict; |
| 4 | use warnings; |
| 5 | |
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6 | use Test::More tests => 2; |
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7 | use Test::Exception; |
| 8 | |
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9 | |
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10 | |
| 11 | ## attribute trait example |
| 12 | { |
| 13 | |
| 14 | package MyApp::Meta::Attribute::Trait::Labeled; |
| 15 | use Moose::Role; |
| 16 | |
| 17 | has label => ( |
| 18 | is => 'rw', |
| 19 | isa => 'Str', |
| 20 | predicate => 'has_label', |
| 21 | ); |
| 22 | |
| 23 | package Moose::Meta::Attribute::Custom::Trait::Labeled; |
| 24 | sub register_implementation { 'MyApp::Meta::Attribute::Trait::Labeled' } |
| 25 | |
| 26 | package MyApp::Website; |
| 27 | use Moose; |
| 28 | |
| 29 | has url => ( |
| 30 | traits => [qw/Labeled/], |
| 31 | isa => 'Str', |
| 32 | is => 'rw', |
| 33 | label => "The site's URL", |
| 34 | ); |
| 35 | |
| 36 | has name => ( |
| 37 | is => 'rw', |
| 38 | isa => 'Str', |
| 39 | ); |
| 40 | |
| 41 | sub dump { |
| 42 | my $self = shift; |
| 43 | |
| 44 | my $dump_value = ''; |
| 45 | |
| 46 | # iterate over all the attributes in $self |
| 47 | my %attributes = %{ $self->meta->get_attribute_map }; |
| 48 | foreach my $name (sort keys %attributes) { |
| 49 | |
| 50 | my $attribute = $attributes{$name}; |
| 51 | |
| 52 | # print the label if available |
| 53 | if ($attribute->does('MyApp::Meta::Attribute::Trait::Labeled') |
| 54 | && $attribute->has_label) { |
| 55 | $dump_value .= $attribute->label; |
| 56 | } |
| 57 | # otherwise print the name |
| 58 | else { |
| 59 | $dump_value .= $name; |
| 60 | } |
| 61 | |
| 62 | # print the attribute's value |
| 63 | my $reader = $attribute->get_read_method; |
| 64 | $dump_value .= ": " . $self->$reader . "\n"; |
| 65 | } |
| 66 | |
| 67 | return $dump_value; |
| 68 | } |
| 69 | |
| 70 | } |
| 71 | |
| 72 | my $app = MyApp::Website->new(url => "http://google.com", name => "Google"); |
| 73 | is($app->dump, q{name: Google |
| 74 | The site's URL: http://google.com |
| 75 | }, '... got the expected dump value'); |
| 76 | |
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77 | # using the trait directly in a regular metaclass |
| 78 | { |
| 79 | package MyApp::Meta::Attribute::Labeled; |
| 80 | use Moose; |
| 81 | extends 'Moose::Meta::Attribute'; |
| 82 | with 'MyApp::Meta::Attribute::Trait::Labeled'; |
| 83 | |
| 84 | package Moose::Meta::Attribute::Custom::Labeled; |
| 85 | sub register_implementation { 'MyApp::Meta::Attribute::Labeled' } |
| 86 | |
| 87 | package MyApp::Website2; |
| 88 | use Moose; |
| 89 | |
| 90 | has url => ( |
| 91 | metaclass => 'Labeled', |
| 92 | isa => 'Str', |
| 93 | is => 'rw', |
| 94 | label => "The site's URL", |
| 95 | ); |
| 96 | |
| 97 | has name => ( |
| 98 | is => 'rw', |
| 99 | isa => 'Str', |
| 100 | ); |
| 101 | |
| 102 | sub dump { |
| 103 | my $self = shift; |
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104 | |
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105 | my $dump_value = ''; |
| 106 | |
| 107 | # iterate over all the attributes in $self |
| 108 | my %attributes = %{ $self->meta->get_attribute_map }; |
| 109 | foreach my $name (sort keys %attributes) { |
| 110 | |
| 111 | my $attribute = $attributes{$name}; |
| 112 | |
| 113 | # print the label if available |
| 114 | if ($attribute->isa('MyApp::Meta::Attribute::Labeled') |
| 115 | && $attribute->has_label) { |
| 116 | $dump_value .= $attribute->label; |
| 117 | } |
| 118 | # otherwise print the name |
| 119 | else { |
| 120 | $dump_value .= $name; |
| 121 | } |
| 122 | |
| 123 | # print the attribute's value |
| 124 | my $reader = $attribute->get_read_method; |
| 125 | $dump_value .= ": " . $self->$reader . "\n"; |
| 126 | } |
| 127 | |
| 128 | return $dump_value; |
| 129 | } |
| 130 | |
| 131 | } |
| 132 | |
| 133 | my $app2 = MyApp::Website2->new(url => "http://google.com", name => "Google"); |
| 134 | is($app2->dump, q{name: Google |
| 135 | The site's URL: http://google.com |
| 136 | }, '... got the expected dump value'); |
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137 | |
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