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<?php |
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/** |
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* This file is part of slick/cqrs-tools |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Slick\CQRSTools\Domain\Event; |
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use ArrayIterator; |
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use Slick\CQRSTools\Event; |
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/** |
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* EventStream |
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* |
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* @package Slick\CQRSTools\Domain\Event |
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*/ |
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final class EventStream implements Stream |
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{ |
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/** |
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* @var Event[] |
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*/ |
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private $events = []; |
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/** |
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* @var ArrayIterator |
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*/ |
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private $iterator; |
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/** |
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* Creates an Event Stream |
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* |
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* @param array $events |
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* @throws \ReflectionException |
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*/ |
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public function __construct(array $events = []) |
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{ |
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foreach ($events as $event) { |
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$this->add($event); |
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} |
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} |
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/** |
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* iterator |
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* |
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* @return ArrayIterator |
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*/ |
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private function iterator(): ArrayIterator |
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{ |
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if (null === $this->iterator) { |
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$this->iterator = new ArrayIterator($this->events); |
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} |
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return $this->iterator; |
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} |
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/** |
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* Adds an event to the stream |
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* |
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* @param Event|StoredEvent $event |
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* |
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* @return EventStream |
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* @throws \ReflectionException |
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*/ |
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public function add(Event $event): EventStream |
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{ |
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$this->iterator = null; |
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$event = $event instanceof StoredEvent ? $event->event() : $event; |
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array_push($this->events, $event); |
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return $this; |
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} |
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/** |
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* Returns the event list as an array |
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* |
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* @return Event[] |
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*/ |
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public function asArray(): array |
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{ |
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return $this->events; |
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} |
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/** |
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* Count the events in this stream |
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* |
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* @return int |
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*/ |
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public function count() |
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{ |
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return count($this->events); |
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} |
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/** |
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* Returns true if this stream has no events |
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* |
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* @return bool |
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*/ |
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public function isEmpty(): bool |
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{ |
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return empty($this->events); |
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} |
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/** |
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* Returns the first event in stream or null if stream is empty |
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* |
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* @return null|Event |
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*/ |
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public function first(): ?Event |
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{ |
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return reset($this->events) ?: null; |
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} |
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/** |
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* Returns the first event in stream or null if stream is empty |
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* |
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* @return null|Event |
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*/ |
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public function last(): ?Event |
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{ |
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return end($this->events) ?: null; |
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} |
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/** |
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* Return the current element |
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* |
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* @return mixed Can return any type. |
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*/ |
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public function current() |
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{ |
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return $this->iterator()->current(); |
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} |
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/** |
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* Move forward to next element |
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* |
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* @return void Any returned value is ignored. |
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*/ |
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public function next() |
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{ |
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$this->iterator()->next(); |
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} |
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/** |
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* Return the key of the current element |
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* |
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* @return mixed scalar on success, or null on failure. |
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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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* Checks if current position is valid |
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* |
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* @return boolean The return value will be casted to boolean and then evaluated. |
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* Returns true on success or false on failure. |
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*/ |
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public function valid() |
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{ |
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return $this->iterator()->valid(); |
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} |
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/** |
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* Rewind the Iterator to the first element |
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* |
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* @return void Any returned value is ignored. |
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*/ |
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public function rewind() |
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{ |
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$this->iterator()->rewind(); |
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} |
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} |
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slickframework /
cqrs-tools
