annotate Lib/IMPL/Web/Handler/ViewSelector.pm @ 245:7c517134c42f

Added Unsupported media type Web exception corrected resourceLocation setting in the resource Implemented localizable resources for text messages fixed TT view scopings, INIT block in controls now sets globals correctly.
author sergey
date Mon, 29 Oct 2012 03:15:22 +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
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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