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<?php |
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declare( strict_types = 1 ); |
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namespace WMDE\TraversableIterator; |
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use Iterator; |
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use IteratorAggregate; |
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use IteratorIterator; |
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use Traversable; |
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/** |
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* @license GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class TraversableIterator implements Iterator { |
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private $traversable; |
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/** |
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* @var Iterator |
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*/ |
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private $innerIterator; |
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public function __construct( Traversable $traversable ) { |
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$this->traversable = $traversable; |
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$this->innerIterator = $this->buildInnerIterator(); |
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} |
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private function buildInnerIterator(): Iterator { |
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if ( $this->traversable instanceof Iterator ) { |
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return $this->traversable; |
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} |
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if ( $this->traversable instanceof IteratorAggregate ) { |
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return new TraversableIterator( $this->traversable->getIterator() ); |
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} |
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return new IteratorIterator( $this->traversable ); |
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} |
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/** |
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* Return the current element |
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* @see Iterator::current |
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* @link http://php.net/manual/en/iterator.current.php |
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* @return mixed |
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*/ |
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public function current() { |
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return $this->innerIterator->current(); |
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} |
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/** |
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* Move forward to next element |
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* @see Iterator::next |
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* @link http://php.net/manual/en/iterator.next.php |
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*/ |
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public function next() { |
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$this->innerIterator->next(); |
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} |
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/** |
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* Return the key of the current element |
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* @see Iterator::key |
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* @link http://php.net/manual/en/iterator.key.php |
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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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return $this->innerIterator->key(); |
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} |
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/** |
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* Checks if current position is valid |
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* @see Iterator::rewind |
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* @link http://php.net/manual/en/iterator.valid.php |
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* @return boolean |
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*/ |
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public function valid() { |
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return $this->innerIterator->valid(); |
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} |
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/** |
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* Rewind the Iterator to the first element |
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* @see Iterator::rewind |
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* @link http://php.net/manual/en/iterator.rewind.php |
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*/ |
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public function rewind() { |
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$this->innerIterator = $this->buildInnerIterator(); |
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$this->innerIterator->rewind(); |
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} |
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} |
wmde /
traversable-iterator
