Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/Resource.pm @ 246:2746a8e5a6c4
Fixed regressions in DOM due previous refactorings
Fixed ObjectToDOM transformation to handle a schema with mixed node types
| author | sergey |
|---|---|
| date | Tue, 30 Oct 2012 01:17:31 +0400 |
| parents | 7c517134c42f |
| children | 814d755e5d12 |
| rev | line source |
|---|---|
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1 package IMPL::Web::Application::Resource; |
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2 use strict; |
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3 |
| 230 | 4 use IMPL::Const qw(:prop); |
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5 use IMPL::declare { |
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6 require => { |
| 244 | 7 ViewResult => 'IMPL::Web::ViewResult', |
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8 Exception => 'IMPL::Exception', |
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9 ArgumentException => '-IMPL::InvalidArgumentException', |
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10 OperationException => '-IMPL::InvalidOperationException', |
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11 NotAllowedException => 'IMPL::Web::NotAllowedException', |
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12 NotFoundException => 'IMPL::Web::NotFoundException' |
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13 }, |
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14 base => [ |
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15 'IMPL::Object' => undef, |
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16 'IMPL::Web::Application::ResourceInterface' => undef |
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17 ], |
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18 props => [ |
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19 parent => PROP_GET | PROP_OWNERSET, |
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20 model => PROP_GET | PROP_OWNERSET, |
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21 id => PROP_GET | PROP_OWNERSET, |
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22 contract => PROP_GET | PROP_OWNERSET, |
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23 location => PROP_GET | PROP_OWNERSET |
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24 ] |
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25 }; |
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26 |
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27 sub CTOR { |
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28 my ( $this, %args ) = @_; |
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29 |
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30 die ArgumentException->new( id => 'A resource identifier is required' ) |
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31 unless $args{id}; |
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32 die ArgumentException->new( contract => 'A contract is required' ) |
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33 unless $args{id}; |
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34 |
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35 $this->parent( $args{parent} ); |
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36 $this->model( $args{model} ); |
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37 $this->id( $args{id} ); |
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38 $this->contract( $args{contract} ); |
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39 |
| 230 | 40 # если расположение явно не указано, то оно вычисляется автоматически, |
| 41 # либо остается не заданным | |
| 42 $this->location( $args{location} || eval { $this->parent->location->Child( $this->id ) } ); | |
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43 } |
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44 |
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45 sub InvokeHttpVerb { |
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46 my ( $this, $verb, $action ) = @_; |
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47 |
| 230 | 48 my $operation = $this->contract->verbs->{ lc($verb) }; |
| 49 | |
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50 die NotAllowedException->new( |
| 230 | 51 allow => join( ',', map( uc, keys %{ $this->contract->verbs } ) ) |
| 52 ) | |
| 53 unless $operation; | |
| 245 | 54 |
| 55 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно | |
| 56 # сохранить оригинальный resourceLocation | |
| 57 $action->context->{resourceLocation} ||= $this->location; | |
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58 |
| 230 | 59 return $operation->Invoke( $this, $action ); |
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60 } |
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61 |
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62 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся |
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63 # в контракте. |
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64 sub FetchChildResource { |
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65 my ( $this, $childId ) = @_; |
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66 |
| 230 | 67 my ($info,$childIdParts) = $this->contract->FindChildResourceInfo($childId); |
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68 |
| 230 | 69 die NotFoundException->new($this->location->url,$childId) unless $info; |
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70 |
| 230 | 71 my $binding = $info->{binding}; |
| 72 my $contract = $info->{contract} | |
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73 or die OperationException->new("Can't fetch a contract for the resource", $childId); |
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74 |
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75 my %args = ( |
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76 parent => $this, |
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77 id => $childId |
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78 ); |
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79 |
| 230 | 80 $args{model} = _InvokeDelegate($binding,$this,@$childIdParts); |
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81 |
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82 return $contract->CreateResource(%args); |
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83 } |
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84 |
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85 sub _InvokeDelegate { |
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86 my $delegate = shift; |
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87 |
| 230 | 88 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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89 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke')}; |
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90 } |
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91 |
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92 1; |
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93 |
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94 __END__ |
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95 |
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96 =pod |
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97 |
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98 =head1 NAME |
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99 |
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100 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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101 |
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102 =head1 SYNOPSIS |
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103 |
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104 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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105 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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106 метода. |
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107 |
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108 Экземпляры данного класса передаются в качестве параметров делегатам |
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109 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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110 и C<IMPL::Web::Application::OperationContract>. |
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111 |
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112 =head1 DESCRIPTION |
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113 |
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114 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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115 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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116 или он отличается от того, что предоставляется стандартно |
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117 C<IMPL::Web::Application::ResourceContract>. |
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118 |
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119 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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120 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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121 ресурсов на самом деле рассматривается как пустой контейнер. |
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122 |
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123 С ресурсом непосредственно взаимодействует котроллер запросов |
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124 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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125 |
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126 =over |
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127 |
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128 =item * C<FetchChildResource($childId)> |
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129 |
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130 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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131 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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132 ресурса, после чего создает дочерний ресурс. |
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133 |
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134 Если дочерний ресурс не найден, вызывается исключение |
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135 C<IMPL::Web::NotFoundException>. |
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136 |
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137 =item * C<InvokeHttpVerb($verb,$action)> |
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138 |
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139 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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140 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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141 Затем найденный контракт для указанной операции используется для обработки |
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142 запроса. |
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143 |
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144 =back |
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145 |
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146 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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147 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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148 собственный класс ресурса, например унаследованный от |
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149 C<IMPL::Web::Application::CustomResource>. |
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150 |
| 230 | 151 =head1 MEMBERS |
| 152 | |
| 153 =head2 C<[get]contract> | |
| 154 | |
| 155 Обязательное свойство для ресурса, ссылается, на контракт, соотсетствующий | |
| 156 данному ресурсу, используется для выполнения C<HTTP> методов и получения | |
| 157 дочерних ресурсов. | |
| 158 | |
| 159 =head2 C<[get]id> | |
| 160 | |
| 161 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
| 162 для корневого ресурса может иметь произвольное значение. | |
| 163 | |
| 164 =head2 C<[get]parent> | |
| 165 | |
| 166 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
| 167 | |
| 168 =head2 C<[get]model> | |
| 169 | |
| 170 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
| 171 свойство не является обязательным и может быть не задано. | |
| 172 | |
| 173 =head2 C<[get]location> | |
| 174 | |
| 175 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
| 176 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
| 177 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
| 178 адрес ресурса не содержит параметров запроса, а только путь. | |
| 179 | |
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180 =cut |
