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<?php
/**
* TPagedDataSource, TPagedListIterator, TPagedMapIterator classes
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Collections
*/
namespace Prado\Collections;
/**
* TPagedListIterator class
*
* TPagedListIterator implements \Iterator interface.
*
* TPagedListIterator is used by {@link TPagedDataSource}. It allows TPagedDataSource
* to return a new iterator for traversing the items in a {@link TList} object.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package Prado\Collections
* @since 3.0
*/
class TPagedListIterator implements \Iterator
{
private $_list;
private $_startIndex;
private $_count;
private $_index;
/**
* Constructor.
* @param TList the data to be iterated through
* @param integer start index
* @param integer number of items to be iterated through
*/
public function __construct(TList $list,$startIndex,$count)
{
$this->_list=$list;
$this->_index=0;
$this->_startIndex=$startIndex;
if($startIndex+$count>$list->getCount())
$this->_count=$list->getCount()-$startIndex;
else
$this->_count=$count;
}
/**
* Rewinds internal array pointer.
* This method is required by the interface Iterator.
*/
public function rewind()
{
$this->_index=0;
}
/**
* Returns the key of the current array item.
* This method is required by the interface Iterator.
* @return integer the key of the current array item
*/
public function key()
{
return $this->_index;
}
/**
* Returns the current array item.
* This method is required by the interface Iterator.
* @return mixed the current array item
*/
public function current()
{
return $this->_list->itemAt($this->_startIndex+$this->_index);
}
/**
* Moves the internal pointer to the next array item.
* This method is required by the interface Iterator.
*/
public function next()
{
$this->_index++;
}
/**
* Returns whether there is an item at current position.
* This method is required by the interface Iterator.
* @return boolean
*/
public function valid()
{
return $this->_index<$this->_count;
}
}
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