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annotate Lib/IMPL/Web/Handler/ViewSelector.pm @ 250:129e48bb5afb

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DOM refactoring ObjectToDOM methods are virtual QueryToDOM uses inflators Fixed transform for the complex values in the ObjectToDOM QueryToDOM doesn't allow to use complex values (HASHes) as values for nodes (overpost problem)
author sergey
date Wed, 07 Nov 2012 04:17:53 +0400
parents 3cebcf6fdb9b
children
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1 package IMPL::Web::Handler::ViewSelector;
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2 use strict;
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3
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4 use IMPL::Const qw(:prop);
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5
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6 use IMPL::declare {
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7 require => {
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8 NotAcceptable => 'IMPL::Web::NotAcceptableException',
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9 HttpResponse => 'IMPL::Web::HttpResponse'
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10 },
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11 base => [
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12 'IMPL::Object' => undef,
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13 'IMPL::Object::Autofill' => '@_',
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14 'IMPL::Object::Serializable' => undef
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15 ],
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16 props => [
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17 views => PROP_RW | PROP_LIST,
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18 fallback => PROP_RW,
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19 types => PROP_RW
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20 ]
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21 };
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22
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23 sub Invoke {
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24 my ( $this, $action, $next ) = @_;
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25
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26 my $result = $next ? $next->($action) : undef;
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27
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28 my $model;
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29
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30 return $result if eval { $result->isa(HttpResponse) };
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31
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32 my $handler;
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33 my $path = $action->pathInfo;
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34
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35 if ( $this->types and $path =~ m/\.(\w+)$/ ) {
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36 my $forced;
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37 if ( $forced = $this->types->{$1} and $action->query->Accept($forced) )
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38 {
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39 ($handler) =
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40 grep eval { $_->can('contentType') }
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41 && $_->contentType eq $forced, $this->views;
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42 }
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43 }
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44
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45 if ( not $handler ) {
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46
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47 my @handlers =
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48 sort { $b->{preference} <=> $a->{preference} } map {
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49 {
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50 handler => $_,
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51 preference => eval { $_->can('contentType') }
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52 ? $action->query->Accept( $_->contentType )
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53 : 0
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54 }
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55 } $this->views;
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56
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57 my $info = shift @handlers;
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58 $handler = $info ? $info->{handler} : undef;
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59
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60 }
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61
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62 die NotAcceptable->new(
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63 map {
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64 eval { $_->can('contentType') } ? $_->contentType : ()
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65 } $this->views
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66 ) unless $handler;
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67
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68 return $handler->Invoke( $action, sub { $result } );
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69 }
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70
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71 1;
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72
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73 __END__
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74
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75 =pod
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76
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77 =head1 NAME
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78
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79 C<IMPL::Web::Handler::ViewSelector> - Выбор нужного представления на основе заголовка C<Accept>
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80
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81 =head1 DESCRIPTION
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82
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83 Использует заголовок запроса C<Accept> для выбора подходящего представления, если задано свойство C<types>,
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84 пытается в первую очередь по расширению определить, какое представление подходит.
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85
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86 В случаях, когда не требуется строить представление для данных (например, при перенаправлении к другому
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87 ресурсу или если нет данных), нужно, чтобы данному обработчику был возвращен
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88 L<IMPL::Web::Application::ActionResult>, который будет просто передан далее.
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89
208
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90 =head1 MEMBERS
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91
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92 =head2 C<[get,set,list]views>
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93
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94 Список представлений, которые могут быть возвращены.
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95
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96 =head2 C<[get,set]types>
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97
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98 Хеш с соотвествием между расширением и типом содержимого, для подсказки при выборе представления.
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99
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100 =cut