/**
*
* @param \Traversable $iterator
* @param Callable $callback
*/
public function __construct(\Traversable $iterator, $callback)
{
$this->_iterator = $iterator;
while ($this->_iterator instanceof \IteratorAggregate) {
$this->_iterator = $this->_iterator->getIterator();
}
$this->_callback = $callback;
}
private function project()
{
$projection = $this->projection;
$this->currentIterator = $projection($this->innerIterator->current(), $this->innerIterator->key(), $this->innerIterator);
if ($this->currentIterator instanceof \IteratorAggregate) {
$this->currentIterator = $this->currentIterator->getIterator();
} elseif ($this->currentIterator instanceof \Iterator !== true) {
throw new \BadMethodCallException('Projection did not return an iterator');
}
$this->projectionNeeded = false;
}
