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<?php |
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/* |
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* event-sourcing (https://github.com/phpgears/event-sourcing). |
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* Event Sourcing base. |
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* |
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* @license MIT |
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* @link https://github.com/phpgears/event-sourcing |
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* @author Julián Gutiérrez <[email protected]> |
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*/ |
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declare(strict_types=1); |
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namespace Gears\EventSourcing\Event; |
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use Gears\EventSourcing\Event\Exception\InvalidAggregateEventException; |
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final class AggregateEventIteratorStream implements AggregateEventStream |
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{ |
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/** |
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* @var \Iterator<AggregateEvent> |
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*/ |
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private $iterator; |
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/** |
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* AggregateEventIteratorStream constructor. |
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* |
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* @param \Iterator<mixed> $iterator |
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*/ |
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public function __construct(\Iterator $iterator) |
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{ |
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// Prevents forward-only iterators such as \Generator |
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$iterator->rewind(); |
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$this->iterator = $iterator; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return AggregateEvent |
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*/ |
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public function current(): AggregateEvent |
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{ |
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/** @var mixed $event */ |
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$event = $this->iterator->current(); |
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if (!$event instanceof AggregateEvent) { |
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throw new InvalidAggregateEventException(\sprintf( |
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'Aggregate event stream only accepts "%s", "%s" given', |
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AggregateEvent::class, |
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\is_object($event) ? \get_class($event) : \gettype($event) |
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)); |
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} |
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return $event; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function next(): void |
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{ |
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$this->iterator->next(); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return string|int|null |
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*/ |
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public function key() |
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{ |
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return $this->iterator->key(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function valid(): bool |
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{ |
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return $this->iterator->valid(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function rewind(): void |
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{ |
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$this->iterator->rewind(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function count(): int |
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{ |
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if ($this->iterator instanceof \EmptyIterator) { |
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return 0; |
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} |
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if ($this->iterator instanceof \Countable) { |
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return $this->iterator->count(); |
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} |
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$currentKey = $this->iterator->key(); |
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$this->iterator->rewind(); |
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$count = 0; |
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while ($this->iterator->valid()) { |
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$count++; |
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$this->iterator->next(); |
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} |
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$this->iterator->rewind(); |
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while ($this->iterator->key() !== $currentKey) { |
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$this->iterator->next(); |
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} |
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return $count; |
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} |
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} |
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phpgears /
event-sourcing
