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54 lines
1.6 KiB
54 lines
1.6 KiB
14 years ago
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<?php
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/**
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* CExpressionDependency class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2011 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CExpressionDependency represents a dependency based on the result of a PHP expression.
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*
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* CExpressionDependency performs dependency checking based on the
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* result of a PHP {@link expression}.
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* The dependency is reported as unchanged if and only if the result is
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* the same as the one evaluated when storing the data to cache.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id$
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* @package system.caching.dependencies
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* @since 1.0
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*/
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class CExpressionDependency extends CCacheDependency
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{
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/**
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* @var string the PHP expression whose result is used to determine the dependency.
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* The expression can also be a valid PHP callback,
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* including class method name (array(ClassName/Object, MethodName)),
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* or anonymous function (PHP 5.3.0+). The function/method will be passed with a
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* parameter which is the dependency object itself.
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*/
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public $expression;
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/**
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* Constructor.
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* @param string $expression the PHP expression whose result is used to determine the dependency.
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*/
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public function __construct($expression='true')
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{
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$this->expression=$expression;
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}
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/**
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* Generates the data needed to determine if dependency has been changed.
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* This method returns the result of the PHP expression.
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* @return mixed the data needed to determine if dependency has been changed.
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*/
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protected function generateDependentData()
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{
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return $this->evaluateExpression($this->expression);
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}
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}
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