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<?php declare(strict_types=1); |
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namespace DaveRandom\Jom; |
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use DaveRandom\Jom\Exceptions\CloneForbiddenException; |
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final class NodeListIterator implements \Iterator |
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{ |
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public const INACTIVE = -1; |
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public const ACTIVE = 1; |
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/** @var Node|null */ |
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private $firstNode; |
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/** @var callable|null */ |
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private $activityStateChangeNotifier; |
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/** @var int */ |
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private $activityState = self::INACTIVE; |
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/** @var Node|null */ |
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private $currentNode; |
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public function __construct(?Node $firstNode, ?callable $activityStateChangeNotifier = null) |
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{ |
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$this->firstNode = $firstNode; |
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$this->activityStateChangeNotifier = $activityStateChangeNotifier; |
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} |
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/** |
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* @throws CloneForbiddenException |
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*/ |
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public function __clone() |
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{ |
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throw new CloneForbiddenException(self::class . ' instance cannot be cloned'); |
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} |
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private function notifyActivityStateChange(int $newState): void |
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{ |
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if ($this->activityState === $newState) { |
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return; |
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} |
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$this->activityState = $newState; |
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if ($this->activityStateChangeNotifier !== null) { |
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($this->activityStateChangeNotifier)($this->activityState); |
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} |
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} |
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public function __destruct() |
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{ |
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$this->notifyActivityStateChange(self::INACTIVE); |
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} |
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public function current(): ?Node |
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{ |
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return $this->currentNode; |
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} |
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public function next(): void |
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{ |
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if ($this->currentNode !== null) { |
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$this->currentNode = $this->currentNode->getNextSibling(); |
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} |
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} |
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public function key() |
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{ |
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return $this->currentNode !== null |
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? $this->currentNode->getKey() |
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: null; |
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} |
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public function valid(): bool |
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{ |
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if ($this->currentNode !== null) { |
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return true; |
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} |
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$this->notifyActivityStateChange(self::INACTIVE); |
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return false; |
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} |
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public function rewind(): void |
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{ |
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$this->notifyActivityStateChange(self::ACTIVE); |
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$this->currentNode = $this->firstNode; |
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} |
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} |
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DaveRandom /
JOM
