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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Paginator
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
/**
* @category Zend
* @package Zend_Paginator
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Paginator_SerializableLimitIterator extends LimitIterator implements Serializable, ArrayAccess
{
/**
* Offset to first element
*
* @var int
*/
private $_offset;
/**
* Maximum number of elements to show or -1 for all
*
* @var int
*/
private $_count;
/**
* Construct a Zend_Paginator_SerializableLimitIterator
*
* @param Iterator $it Iterator to limit (must be serializable by un-/serialize)
* @param int $offset Offset to first element
* @param int $count Maximum number of elements to show or -1 for all
* @see LimitIterator::__construct
*/
public function __construct (Iterator $it, $offset=0, $count=-1)
{
parent::__construct($it, $offset, $count);
$this->_offset = $offset;
$this->_count = $count;
}
/**
* @return string representation of the instance
*/
public function serialize()
{
return serialize(array(
'it' => $this->getInnerIterator(),
'offset' => $this->_offset,
'count' => $this->_count,
'pos' => $this->getPosition(),
));
}
/**
* @param string $data representation of the instance
*/
public function unserialize($data)
{
$dataArr = unserialize($data);
$this->__construct($dataArr['it'], $dataArr['offset'], $dataArr['count']);
$this->seek($dataArr['pos']+$dataArr['offset']);
}
/**
* Returns value of the Iterator
*
* @param int $offset
* @return mixed
*/
public function offsetGet($offset)
{
$currentOffset = $this->key();
$this->seek($offset);
$current = $this->current();
$this->seek($currentOffset);
return $current;
}
/**
* Does nothing
* Required by the ArrayAccess implementation
*
* @param int $offset
* @param mixed $value
*/
public function offsetSet($offset, $value)
{
}
/**
* Determine if a value of Iterator is set and is not NULL
*
* @param int $offset
*/
public function offsetExists($offset)
{
if ($offset > 0 && $offset < $this->_count) {
try {
$currentOffset = $this->key();
$this->seek($offset);
$current = $this->current();
$this->seek($currentOffset);
return null !== $current;
} catch (OutOfBoundsException $e) {
// reset position in case of exception is assigned null
$this->rewind();
$this->seek($currentOffset);
return false;
}
}
return false;
}
/**
* Does nothing
* Required by the ArrayAccess implementation
*
* @param int $offset
*/
public function offsetUnset($offset)
{
}
}
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