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<?php
/**
* CFileCacheDependency 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/
*/

/**
* CFileCacheDependency represents a dependency based on a file's last modification time.
*
* CFileCacheDependency performs dependency checking based on the
* last modification time of the file specified via {@link fileName}.
* The dependency is reported as unchanged if and only if the file's
* last modification time remains unchanged.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.caching.dependencies
* @since 1.0
*/
class CFileCacheDependency extends CCacheDependency
{
/**
* @var string the name of the file whose last modification time is used to
* check if the dependency has been changed.
*/
public $fileName;

/**
* Constructor.
* @param string $fileName name of the file whose change is to be checked.
*/
public function __construct($fileName=null)
{
$this->fileName=$fileName;
}

/**
* Generates the data needed to determine if dependency has been changed.
* This method returns the file's last modification time.
* @return mixed the data needed to determine if dependency has been changed.
*/
protected function generateDependentData()
{
if($this->fileName!==null)
return @filemtime($this->fileName);
else
throw new CException(Yii::t('yii','CFileCacheDependency.fileName cannot be empty.'));
}
}
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