Countable iterator and MongoDataModelGenerator

gistfile1.php

interface CountableIterator extends \Iterator, \Countable { }

class MongoDataModelGenerator implements CountableIterator
{

	/** @var MongoCursor */
	private $cursor;

	/**
	 * This should be the function accepting array representing mongo document from MongoCursor and returning something else based on it.
	 * @var callable
	 */
	private $transformer;

	public function __construct(MongoCursor $cursor, callable $transformer)
	{
		$this->cursor = $cursor;
		$this->transformer = $transformer;
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Return the current element
	 * @link http://php.net/manual/en/iterator.current.php
	 * @return mixed Can return any type.
	 */
	public function current()
	{
		return call_user_func($this->transformer, $this->cursor->current());
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Move forward to next element
	 * @link http://php.net/manual/en/iterator.next.php
	 * @return void Any returned value is ignored.
	 */
	public function next()
	{
		$this->cursor->next();
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Return the key of the current element
	 * @link http://php.net/manual/en/iterator.key.php
	 * @return mixed scalar on success, or null on failure.
	 */
	public function key()
	{
		return $this->cursor->key();
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Checks if current position is valid
	 * @link http://php.net/manual/en/iterator.valid.php
	 * @return boolean The return value will be casted to boolean and then evaluated.
	 * Returns true on success or false on failure.
	 */
	public function valid()
	{
		return $this->cursor->valid();
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Rewind the Iterator to the first element
	 * @link http://php.net/manual/en/iterator.rewind.php
	 * @return void Any returned value is ignored.
	 */
	public function rewind()
	{
		$this->cursor->rewind();
	}

	/**
	 * (PHP 5 &gt;= 5.1.0)<br/>
	 * Count elements of an object
	 * @link http://php.net/manual/en/countable.count.php
	 * @return int The custom count as an integer.
	 * </p>
	 * <p>
	 * The return value is cast to an integer.
	 */
	public function count()
	{
		return $this->cursor->count($foundOnly = true);
	}
}