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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Import\LiquidThreadsApi; |
| 4 | |
| 5 | use ArrayIterator; |
| 6 | use Iterator; |
| 7 | |
| 8 | class TopicIterator implements Iterator { |
| 9 | /** |
| 10 | * @var ImportSource |
| 11 | */ |
| 12 | protected $importSource; |
| 13 | |
| 14 | /** |
| 15 | * @var CachedThreadData Access point for api data |
| 16 | */ |
| 17 | protected $threadData; |
| 18 | |
| 19 | /** |
| 20 | * @var int|false|null Lqt id of the current topic, false if no current topic, null if unknown. |
| 21 | */ |
| 22 | protected $current = false; |
| 23 | |
| 24 | /** |
| 25 | * @var ImportTopic The current topic. |
| 26 | */ |
| 27 | protected $currentTopic = null; |
| 28 | |
| 29 | /** |
| 30 | * @var string Name of the remote page the topics exist on |
| 31 | */ |
| 32 | protected $pageName; |
| 33 | |
| 34 | /** |
| 35 | * @var Iterator A list of topic ids. Iterator used to simplify maintaining |
| 36 | * an explicit position within the list. |
| 37 | */ |
| 38 | protected $topicIdIterator; |
| 39 | |
| 40 | /** |
| 41 | * @var int The maximum id received by self::loadMore |
| 42 | */ |
| 43 | protected $maxId; |
| 44 | |
| 45 | /** |
| 46 | * @param ImportSource $source |
| 47 | * @param CachedThreadData $threadData |
| 48 | * @param string $pageName |
| 49 | */ |
| 50 | public function __construct( ImportSource $source, CachedThreadData $threadData, $pageName ) { |
| 51 | $this->importSource = $source; |
| 52 | $this->threadData = $threadData; |
| 53 | $this->pageName = $pageName; |
| 54 | $this->topicIdIterator = new ArrayIterator( $threadData->getTopics() ); |
| 55 | $this->rewind(); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * @return ImportTopic|null |
| 60 | */ |
| 61 | public function current() { |
| 62 | if ( $this->current === false ) { |
| 63 | return null; |
| 64 | } |
| 65 | return $this->currentTopic; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * @return int |
| 70 | */ |
| 71 | public function key() { |
| 72 | return $this->current; |
| 73 | } |
| 74 | |
| 75 | public function next() { |
| 76 | if ( !$this->valid() ) { |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | $lastOffset = $this->key(); |
| 81 | do { |
| 82 | while ( $this->topicIdIterator->valid() ) { |
| 83 | $topicId = $this->topicIdIterator->current(); |
| 84 | $this->topicIdIterator->next(); |
| 85 | |
| 86 | // this topic id has been seen before. |
| 87 | if ( $topicId <= $lastOffset ) { |
| 88 | continue; |
| 89 | } |
| 90 | |
| 91 | // hidden and deleted threads come back as null |
| 92 | $topic = $this->importSource->getTopic( $topicId ); |
| 93 | if ( $topic === null ) { |
| 94 | continue; |
| 95 | } |
| 96 | |
| 97 | $this->current = $topicId; |
| 98 | $this->currentTopic = $topic; |
| 99 | return; |
| 100 | } |
| 101 | } while ( $this->loadMore() ); |
| 102 | |
| 103 | // nothing found, nothing more to load |
| 104 | $this->current = false; |
| 105 | } |
| 106 | |
| 107 | public function rewind() { |
| 108 | $this->current = null; |
| 109 | $this->topicIdIterator->rewind(); |
| 110 | $this->next(); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * @return bool |
| 115 | */ |
| 116 | public function valid() { |
| 117 | return $this->current !== false; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * @return bool True when more topics were loaded |
| 122 | */ |
| 123 | protected function loadMore() { |
| 124 | try { |
| 125 | // + 1 to not return the existing max topic |
| 126 | $output = $this->threadData->getFromPage( $this->pageName, $this->maxId + 1 ); |
| 127 | } catch ( ApiNotFoundException $e ) { |
| 128 | // No more results, end loop |
| 129 | return false; |
| 130 | } |
| 131 | |
| 132 | $this->maxId = max( array_keys( $output ) ); |
| 133 | $this->topicIdIterator = new ArrayIterator( $this->threadData->getTopics() ); |
| 134 | $this->topicIdIterator->rewind(); |
| 135 | |
| 136 | // Keep looping until we get a not found error |
| 137 | return true; |
| 138 | } |
| 139 | } |