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<?php |
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declare(strict_types=1); |
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namespace Serializor; |
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use SplHeap; |
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use SplMaxHeap; |
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use SplMinHeap; |
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/** |
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* Stasis for SplHeap subclasses (SplMaxHeap, SplMinHeap). |
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* PHP <8.5 doesn't have __serialize() for these classes. |
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*/ |
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final class SplHeapStasis extends Stasis |
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{ |
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/** |
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* The heap class name. |
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* @var class-string<SplHeap> |
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*/ |
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private string $c; |
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/** |
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* The heap items (extracted via iteration). |
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* @var array<int, mixed> |
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*/ |
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public array $items = []; |
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/** |
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* @param class-string<SplHeap> $className |
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*/ |
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public function __construct(string $className) |
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{ |
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$this->c = $className; |
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} |
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public function __serialize(): array |
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{ |
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return [$this->c, $this->items]; |
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} |
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public function __unserialize(array $data): void |
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{ |
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[$this->c, $this->items] = $data; |
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} |
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public function getClassName(): string |
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{ |
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return $this->c; |
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} |
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/** |
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* Get reference to items for Codec child transformation. |
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*/ |
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public function &getItems(): array |
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{ |
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return $this->items; |
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} |
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public static function fromHeap(SplHeap $heap): SplHeapStasis |
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{ |
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$className = \get_class($heap); |
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$frozen = new SplHeapStasis($className); |
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// Clone to avoid destructive iteration on original |
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$copy = clone $heap; |
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foreach ($copy as $item) { |
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$frozen->items[] = $item; |
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} |
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return $frozen; |
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} |
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public function &getInstance(): mixed |
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{ |
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if ($this->hasInstance()) { |
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return $this->getCachedInstance(); |
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} |
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$rc = new \ReflectionClass($this->c); |
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/** @var SplHeap $heap */ |
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$heap = $rc->newInstance(); |
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// Re-insert all items |
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foreach ($this->items as $item) { |
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$heap->insert($item); |
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} |
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$this->setInstance($heap); |
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return $heap; |
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} |
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} |
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