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<?php
/**
* CExpressionDependency 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/
*/

/**
* CExpressionDependency represents a dependency based on the result of a PHP expression.
*
* CExpressionDependency performs dependency checking based on the
* result of a PHP {@link expression}.
* The dependency is reported as unchanged if and only if the result is
* the same as the one evaluated when storing the data to cache.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.caching.dependencies
* @since 1.0
*/
class CExpressionDependency extends CCacheDependency
{
/**
* @var string the PHP expression whose result is used to determine the dependency.
* The expression can also be a valid serializable PHP callback.
* The callback will be passed with a parameter which is the dependency object itself.
*/
public $expression;

/**
* Constructor.
* @param string $expression the PHP expression whose result is used to determine the dependency.
*/
public function __construct($expression='true')
{
$this->expression=$expression;
}

/**
* Generates the data needed to determine if dependency has been changed.
* This method returns the result of the PHP expression.
* @return mixed the data needed to determine if dependency has been changed.
*/
protected function generateDependentData()
{
return $this->evaluateExpression($this->expression);
}
}
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