zf doctrine paginator adapter

Paginator.php

<?php

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 * Description of Paginator
 *
 * @author Sina Miandashti
 */
class Paginator implements Zend_Paginator_Adapter_Interface {

    protected $_doctrineQueryBuilder;
    function __construct($_doctrineQuery) {
        $this->_doctrineQueryBuilder = $_doctrineQuery;
        
    }
    public function count() {
        
        
        if (!is_a($this->_doctrineQueryBuilder, 'Doctrine\ORM\Query')) {
            $query = $this->_doctrineQueryBuilder->getQuery();
        } else {
            $query = $this->_doctrineQueryBuilder;
        }
       
        return count($query->getResult());
        
       
    }
    public function getItems($offset, $itemCountPerPage) {
        $this->_doctrineQueryBuilder->setFirstResult( $offset )
        ->setMaxResults( $itemCountPerPage );
        
        
        if (!is_a($this->_doctrineQueryBuilder, 'Doctrine\ORM\Query')) {
            $query = $this->_doctrineQueryBuilder->getQuery();
        } else {
            $query = $this->_doctrineQueryBuilder;
        }
        return $query->getResult();
    }
}

?>