Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/ResourceBase.pm @ 400:ef37ec102dab
redirection support while fetching child resources
author | cin |
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date | Wed, 14 May 2014 17:27:32 +0400 |
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1 package IMPL::Web::Application::ResourceBase; |
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2 use strict; |
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3 |
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4 use URI; |
334 | 5 use Carp qw(carp); |
6 use IMPL::lang qw(:hash :base); | |
230 | 7 use IMPL::Const qw(:prop); |
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8 use IMPL::declare { |
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9 require => { |
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10 |
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11 Exception => 'IMPL::Exception', |
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12 ArgumentException => '-IMPL::InvalidArgumentException', |
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13 OperationException => '-IMPL::InvalidOperationException', |
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14 NotAllowedException => 'IMPL::Web::NotAllowedException', |
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15 |
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16 }, |
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17 base => [ |
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18 'IMPL::Object' => undef, |
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19 'IMPL::Web::Application::ResourceInterface' => undef |
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20 ], |
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21 props => [ |
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22 request => PROP_RO, |
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23 application => PROP_RO, |
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24 parent => PROP_RO, |
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25 model => PROP_RO, |
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26 id => PROP_RO, |
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27 location => PROP_RO, |
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28 role => PROP_RO | PROP_LIST |
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29 ] |
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30 }; |
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31 |
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32 sub CTOR { |
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33 my ( $this, %args ) = @_; |
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34 |
334 | 35 die ArgumentException->new(request => 'A request object must be specified') |
36 unless $args{request}; | |
37 | |
38 $this->request( $args{request} ); | |
394 | 39 $this->parent( $args{parent} ) if $args{parent}; |
40 $this->model( $args{model} ) if $args{model}; | |
41 $this->id( $args{id} ) if $args{id}; | |
333 | 42 $this->application( $args{request}->application ); |
334 | 43 |
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44 # если расположение явно не указано, то оно вычисляется автоматически, |
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45 # либо остается не заданным |
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46 $this->location( $args{location} |
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47 || eval { $this->parent->location->Child( $this->id ) } ); |
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48 |
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49 if (my $role = $args{role}) { |
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50 if (ref($role) eq 'ARRAY') { |
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51 $this->role($role); |
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52 } elsif (not ref($role)) { |
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53 $this->role(split(/\s+/, $role)); |
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54 } else { |
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55 die ArgumentException->new( role => 'A invalid value is provided, expected ARRAY or SCALAR'); |
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56 } |
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57 } |
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58 } |
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59 |
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60 sub InvokeHttpVerb { |
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61 my ( $this, $verb ) = @_; |
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62 |
334 | 63 my $operation = $this->verbs->{ lc($verb) }; |
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64 |
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65 die NotAllowedException->new( |
335 | 66 allow => join( ',', $this->GetAllowedMethods ) ) |
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67 unless $operation; |
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68 |
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69 $this->AccessCheck($verb); |
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70 my $request = $this->request; |
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71 |
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72 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно |
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73 # сохранить оригинальный resourceLocation |
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74 $request->context->{resourceLocation} ||= $this->location; |
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75 |
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76 # это свойство специфично только для REST приложений. |
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77 # сохранение текущего ресурса не повлечет за собой существенных расходов, |
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78 # т.к. они просто освободятся несколько позже. |
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79 if ( not $request->context->{resource} ) { |
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80 $request->context->{resource} = $this; |
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81 } |
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82 |
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83 return _InvokeDelegate( $operation, $this, $request ); |
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84 } |
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85 |
357 | 86 sub security { |
87 shift->request->security | |
88 } | |
89 | |
394 | 90 sub context { |
91 shift->request->context | |
92 } | |
93 | |
357 | 94 sub verbs { |
95 {} # возвращаем пстой список операций | |
96 } | |
97 | |
335 | 98 sub GetAllowedMethods { |
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99 map( uc, keys %{ shift->verbs } ); |
335 | 100 } |
101 | |
330 | 102 sub AccessCheck { |
332
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103 |
330 | 104 } |
105 | |
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106 sub Seek { |
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107 my ($this, $role) = @_; |
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108 |
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109 my @roles; |
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110 |
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111 if (ref($role) eq 'ARRAY') { |
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112 @roles = @{$role}; |
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113 } elsif (not ref($role)) { |
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114 @roles = split(/\s+/, $role); |
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115 } else { |
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116 die ArgumentException->new( role => 'A invalid value is provided, expected ARRAY or SCALAR'); |
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117 } |
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118 |
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119 |
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120 for(my $r = $this; $r; $r = $r->parent) { |
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121 return $r if $r->HasRole(@roles); |
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122 } |
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123 return; |
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124 } |
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125 |
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126 sub HasRole { |
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127 my ($this, @roles) = @_; |
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128 my %cache = map { $_, 1 } @{$this->role}; |
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129 return scalar(grep not($cache{$_}), @roles) ? 0 : 1; |
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130 } |
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131 |
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132 sub _InvokeDelegate { |
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133 my $delegate = shift; |
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134 |
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135 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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136 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke') }; |
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137 } |
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138 |
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139 1; |
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140 |
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141 __END__ |
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142 |
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143 =pod |
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144 |
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145 =head1 NAME |
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146 |
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147 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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148 |
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149 =head1 SYNOPSIS |
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150 |
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151 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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152 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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153 метода. |
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154 |
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155 Экземпляры данного класса передаются в качестве параметров делегатам |
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156 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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157 и C<IMPL::Web::Application::OperationContract>. |
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158 |
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159 =head1 DESCRIPTION |
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160 |
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161 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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162 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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163 или он отличается от того, что предоставляется стандартно |
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164 C<IMPL::Web::Application::ResourceContract>. |
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165 |
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166 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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167 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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168 ресурсов на самом деле рассматривается как пустой контейнер. |
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169 |
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170 С ресурсом непосредственно взаимодействует котроллер запросов |
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171 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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172 |
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173 =over |
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174 |
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175 =item * C<FetchChildResource($childId)> |
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176 |
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177 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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178 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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179 ресурса, после чего создает дочерний ресурс. |
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180 |
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181 Если дочерний ресурс не найден, вызывается исключение |
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182 C<IMPL::Web::NotFoundException>. |
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183 |
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184 =item * C<InvokeHttpVerb($verb,$action)> |
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185 |
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186 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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187 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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188 Затем найденный контракт для указанной операции используется для обработки |
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189 запроса. |
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190 |
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191 =back |
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192 |
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193 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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194 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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195 собственный класс ресурса, например унаследованный от |
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196 C<IMPL::Web::Application::CustomResource>. |
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197 |
230 | 198 =head1 MEMBERS |
199 | |
357 | 200 =head2 C<[get]request> |
201 | |
202 Объект C<IMPL::Web::Application::Action> представляющий запрос к серверу. | |
203 | |
268
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204 =head2 C<[get]application> |
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205 |
357 | 206 Ссылка на приложение, к которому относится данный ресурс. Получается |
207 автоматически из объекта запроса. | |
268
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208 |
230 | 209 =head2 C<[get]contract> |
210 | |
248 | 211 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий |
230 | 212 данному ресурсу, используется для выполнения C<HTTP> методов и получения |
213 дочерних ресурсов. | |
214 | |
215 =head2 C<[get]id> | |
216 | |
217 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
218 для корневого ресурса может иметь произвольное значение. | |
219 | |
220 =head2 C<[get]parent> | |
221 | |
222 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
223 | |
224 =head2 C<[get]model> | |
225 | |
226 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
227 свойство не является обязательным и может быть не задано. | |
228 | |
229 =head2 C<[get]location> | |
230 | |
231 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
232 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
233 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
234 адрес ресурса не содержит параметров запроса, а только путь. | |
235 | |
359
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236 =head2 C<[get,list]role> |
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237 |
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238 Список ролей ресурса. Роль это условный маркер, который позволяет определить |
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239 функции выполняемые ресурсом, например контейнер, профиль пользователя и т.п. |
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240 |
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241 Используется при построении цепочек навигации, а также при поиске с использованием |
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242 метода C<seek>. |
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243 |
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244 =head2 C<seek($role)> |
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245 |
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246 Ищет ресурс в цепочке родителей (включая сам ресурс) с подходящими ролями. |
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247 |
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248 Роли могут быть переданы в виде массива или строки, где роли разделены пробелами |
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249 |
268
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250 =head2 C<[get]FetchChildResource($id)> |
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251 |
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252 Возвращает дочерний ресурс, по его идентификатору. |
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253 |
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254 Данная реализация использует контракт текущего ресурса для поиска информации о |
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255 дочернем ресурсе C<< $this->contract->FindChildResourceInfo($id) >>. |
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256 |
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257 Затем осуществляется привязка к моделе, тоесть, выполняется делегат, для |
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258 получения модели дочернего ресурса, а затем осуществляется привязка к контракту, |
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259 при этом в делегат, который должен вернуть контракт дочернего ресурса передаются |
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260 текущий ресурc и модель дочернего ресурса. |
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261 |
229
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262 =cut |