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<?php
/**
* CMapIterator class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CMapIterator implements an interator for {@link CMap}.
*
* It allows CMap to return a new iterator for traversing the items in the map.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.collections
* @since 1.0
*/
class CMapIterator implements Iterator
{
/**
* @var array the data to be iterated through
*/
private $_d;
/**
* @var array list of keys in the map
*/
private $_keys;
/**
* @var mixed current key
*/
private $_key;
/**
* Constructor.
* @param array $data the data to be iterated through
*/
public function __construct(&$data)
{
$this->_d=&$data;
$this->_keys=array_keys($data);
$this->_key=reset($this->_keys);
}
/**
* Rewinds internal array pointer.
* This method is required by the interface Iterator.
*/
public function rewind()
{
$this->_key=reset($this->_keys);
}
/**
* Returns the key of the current array element.
* This method is required by the interface Iterator.
* @return mixed the key of the current array element
*/
public function key()
{
return $this->_key;
}
/**
* Returns the current array element.
* This method is required by the interface Iterator.
* @return mixed the current array element
*/
public function current()
{
return $this->_d[$this->_key];
}
/**
* Moves the internal pointer to the next array element.
* This method is required by the interface Iterator.
*/
public function next()
{
$this->_key=next($this->_keys);
}
/**
* Returns whether there is an element at current position.
* This method is required by the interface Iterator.
* @return boolean
*/
public function valid()
{
return $this->_key!==false;
}
}
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