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1 |
1 | <?php |
2 | |
3 | namespace Wikibase\MediaInfo\Content; |
4 | |
5 | use MediaWiki\Context\IContextSource; |
6 | use MediaWiki\Linker\LinkTarget; |
7 | use MediaWiki\Title\Title; |
8 | use Wikibase\Lib\Store\EntityRevision; |
9 | use Wikibase\MediaInfo\DataModel\MediaInfo; |
10 | use Wikibase\MediaInfo\DataModel\MediaInfoId; |
11 | use Wikibase\MediaInfo\Services\FilePageLookup; |
12 | use Wikibase\MediaInfo\Services\MediaInfoIdLookup; |
13 | use Wikibase\Repo\ParserOutput\EntityParserOutputGeneratorFactory; |
14 | |
15 | /** |
16 | * Handler for missing MediaInfo entities. |
17 | * |
18 | * @license GPL-2.0-or-later |
19 | * @author Daniel Kinzler |
20 | */ |
21 | class MissingMediaInfoHandler { |
22 | |
23 | /** |
24 | * @var MediaInfoIdLookup |
25 | */ |
26 | private $idLookup; |
27 | |
28 | /** |
29 | * @var FilePageLookup |
30 | */ |
31 | private $filePageLookup; |
32 | |
33 | /** |
34 | * @var EntityParserOutputGeneratorFactory |
35 | */ |
36 | private $outputGeneratorFactory; |
37 | |
38 | /** |
39 | * @param MediaInfoIdLookup $idLookup |
40 | * @param FilePageLookup $filePageLookup |
41 | * @param EntityParserOutputGeneratorFactory $outputGeneratorFactory |
42 | */ |
43 | public function __construct( |
44 | MediaInfoIdLookup $idLookup, |
45 | FilePageLookup $filePageLookup, |
46 | EntityParserOutputGeneratorFactory $outputGeneratorFactory |
47 | ) { |
48 | $this->idLookup = $idLookup; |
49 | $this->filePageLookup = $filePageLookup; |
50 | $this->outputGeneratorFactory = $outputGeneratorFactory; |
51 | } |
52 | |
53 | /** |
54 | * Returns the MediaInfoId that corresponds to the given $title, if the title is |
55 | * valid for a MediaInfo entity, and a corresponding File page exists. If the title |
56 | * does not correspond to a valid MediaInfoId or no corresponding File page exists, |
57 | * this methods returns null. In other words, if this methods returns a MediaInfoId, |
58 | * that ID can be used to show a "virtual" MediaInfo entity. |
59 | * |
60 | * @see EntityHandler::showMissingEntity |
61 | * |
62 | * @param LinkTarget $title The title of the page that potentially could, but does not, |
63 | * contain an entity. |
64 | * @param IContextSource $context Context to use for reporting. In particular, output |
65 | * will be written to $context->getOutput(). |
66 | * |
67 | * @return MediaInfoId|null |
68 | */ |
69 | public function getMediaInfoId( LinkTarget $title, IContextSource $context ) { |
70 | $mediaInfoId = $this->idLookup->getEntityIdForTitle( Title::newFromLinkTarget( $title ) ); |
71 | if ( $mediaInfoId === null || !( $mediaInfoId instanceof MediaInfoId ) ) { |
72 | return null; |
73 | } |
74 | |
75 | $filePageTitle = $this->filePageLookup->getFilePage( $mediaInfoId ); |
76 | if ( $filePageTitle === null || !$filePageTitle->exists() ) { |
77 | return null; |
78 | } |
79 | |
80 | return $mediaInfoId; |
81 | } |
82 | |
83 | /** |
84 | * Display a "virtual" (empty) MediaInfo entity with the given ID. |
85 | * |
86 | * @see EntityHandler::showMissingEntity |
87 | * |
88 | * @param MediaInfoId $mediaInfoId The ID of the virtual MediaInfo entity to show. |
89 | * @param IContextSource $context Context to use for display. In particular, output |
90 | * will be written to $context->getOutput(), and the output language is determined |
91 | * by $context->getLanguage(). |
92 | */ |
93 | public function showVirtualMediaInfo( MediaInfoId $mediaInfoId, IContextSource $context ) { |
94 | $userLanguage = $context->getLanguage(); |
95 | $outputPage = $context->getOutput(); |
96 | |
97 | // show an empty MediaInfo |
98 | $outputGenerator = $this->outputGeneratorFactory-> |
99 | getEntityParserOutputGenerator( $userLanguage ); |
100 | |
101 | $mediaInfo = new MediaInfo( $mediaInfoId ); |
102 | |
103 | $parserOutput = $outputGenerator->getParserOutput( new EntityRevision( $mediaInfo ), true ); |
104 | |
105 | $outputPage->addParserOutput( $parserOutput ); |
106 | } |
107 | |
108 | } |