class Result extends \lithium\data\source\Result {

	/**
	 * internal (sub)iterator
	 *
	 * @var IteratorIterator
	 */
	protected $_subIterator = null;

	/**
	 * Fetches the next result from the resource.
	 *
	 * @return array|boolean|null Returns a key/value pair for the next result,
	 *         `null` if there is none, `false` if something bad happened.
	 */
	protected function _fetch() {
		if (!$this->_resource) {
			return false;
		}
		if (!$this->_subIterator) {
			$this->_resource->setTypeMap(['root' => 'array', 'document' => 'array']);
			$this->_subIterator = new IteratorIterator($this->_resource);
			$this->_subIterator->rewind();
		}
		if (!$this->_subIterator->valid()) {
			return;
		}
		$result = $this->_subIterator->current();
		$this->_subIterator->next();

		return [$this->_iterator, $result];
	}
}