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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\Notifications\Iterator; |
| 4 | |
| 5 | use ArrayIterator; |
| 6 | use Iterator; |
| 7 | use RecursiveIterator; |
| 8 | |
| 9 | /** |
| 10 | * Presents a list of iterators as a single stream of results |
| 11 | * when wrapped with the RecursiveIteratorIterator. |
| 12 | * |
| 13 | * This differs from the SPL MultipleIterator in the following ways: |
| 14 | * * Does not return null for non-valid child iterators |
| 15 | * * implements RecursiveIterator |
| 16 | * * Lots less features(e.g. simple!) |
| 17 | */ |
| 18 | class MultipleIterator implements RecursiveIterator { |
| 19 | /** @var Iterator[] */ |
| 20 | protected $active = []; |
| 21 | /** @var array */ |
| 22 | protected $children; |
| 23 | /** @var int */ |
| 24 | protected $key = 0; |
| 25 | |
| 26 | public function __construct( array $children ) { |
| 27 | $this->children = $children; |
| 28 | } |
| 29 | |
| 30 | public function rewind(): void { |
| 31 | $this->active = $this->children; |
| 32 | $this->key = 0; |
| 33 | foreach ( $this->active as $key => $it ) { |
| 34 | $it->rewind(); |
| 35 | if ( !$it->valid() ) { |
| 36 | unset( $this->active[$key] ); |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | public function valid(): bool { |
| 42 | return (bool)$this->active; |
| 43 | } |
| 44 | |
| 45 | public function next(): void { |
| 46 | $this->key++; |
| 47 | foreach ( $this->active as $key => $it ) { |
| 48 | $it->next(); |
| 49 | if ( !$it->valid() ) { |
| 50 | unset( $this->active[$key] ); |
| 51 | } |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | #[\ReturnTypeWillChange] |
| 56 | public function current() { |
| 57 | $result = []; |
| 58 | foreach ( $this->active as $it ) { |
| 59 | $result[] = $it->current(); |
| 60 | } |
| 61 | |
| 62 | return $result; |
| 63 | } |
| 64 | |
| 65 | public function key(): int { |
| 66 | return $this->key; |
| 67 | } |
| 68 | |
| 69 | public function hasChildren(): bool { |
| 70 | return (bool)$this->active; |
| 71 | } |
| 72 | |
| 73 | public function getChildren(): ?RecursiveIterator { |
| 74 | // The NotRecursiveIterator is used rather than a RecursiveArrayIterator |
| 75 | // so that nested arrays don't get recursed. |
| 76 | return new NotRecursiveIterator( new ArrayIterator( $this->current() ) ); |
| 77 | } |
| 78 | } |