<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Paginator\Adapter;
use Zend\Paginator;
class Iterator implements AdapterInterface
{
/**
* Iterator which implements Countable
*
* @var Iterator
*/
protected $iterator = null;
/**
* Item count
*
* @var int
*/
protected $count = null;
/**
* Constructor.
*
* @param \Iterator $iterator Iterator to paginate
* @throws \Zend\Paginator\Adapter\Exception\InvalidArgumentException
*/
public function __construct(\Iterator $iterator)
{
if (!$iterator instanceof \Countable) {
throw new Exception\InvalidArgumentException('Iterator must implement Countable');
}
$this->iterator = $iterator;
$this->count = count($iterator);
}
/**
* Returns an iterator of items for a page, or an empty array.
*
* @param int $offset Page offset
* @param int $itemCountPerPage Number of items per page
* @return array|\Zend\Paginator\SerializableLimitIterator
*/
public function getItems($offset, $itemCountPerPage)
{
if ($this->count == 0) {
return array();
}
return new Paginator\SerializableLimitIterator($this->iterator, $offset, $itemCountPerPage);
}
/**
* Returns the total number of rows in the collection.
*
* @return int
*/
public function count()
{
return $this->count;
}
}