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54 lines
1.5 KiB
54 lines
1.5 KiB
14 years ago
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<?php
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/**
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* CFileCacheDependency 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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* CFileCacheDependency represents a dependency based on a file's last modification time.
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*
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* CFileCacheDependency performs dependency checking based on the
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* last modification time of the file specified via {@link fileName}.
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* The dependency is reported as unchanged if and only if the file's
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* last modification time remains unchanged.
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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 CFileCacheDependency extends CCacheDependency
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{
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/**
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* @var string the name of the file whose last modification time is used to
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* check if the dependency has been changed.
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*/
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public $fileName;
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/**
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* Constructor.
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* @param string $fileName name of the file whose change is to be checked.
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*/
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public function __construct($fileName=null)
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{
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$this->fileName=$fileName;
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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 file's last modification time.
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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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if($this->fileName!==null)
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return @filemtime($this->fileName);
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else
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throw new CException(Yii::t('yii','CFileCacheDependency.fileName cannot be empty.'));
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}
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}
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