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<?php
/**
* This file contains CTypedMap class.
*
* @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/
*/
/**
* CTypedMap represents a map whose items are of the certain type.
*
* CTypedMap extends {@link CMap} by making sure that the elements to be
* added to the list is of certain class type.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.collections
* @since 1.0
*/
class CTypedMap extends CMap
{
private $_type;
/**
* Constructor.
* @param string $type class type
*/
public function __construct($type)
{
$this->_type=$type;
}
/**
* Adds an item into the map.
* This method overrides the parent implementation by
* checking the item to be inserted is of certain type.
* @param integer $index the specified position.
* @param mixed $item new item
* @throws CException If the index specified exceeds the bound,
* the map is read-only or the element is not of the expected type.
*/
public function add($index,$item)
{
if($item instanceof $this->_type)
parent::add($index,$item);
else
throw new CException(Yii::t('yii','CTypedMap<{type}> can only hold objects of {type} class.',
array('{type}'=>$this->_type)));
}
}
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