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<?php
/**
* TCache and cache dependency classes.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package System.Caching
*/
/**
* TFileCacheDependency class.
*
* TFileCacheDependency performs dependency checking based on the
* last modification time of the file specified via {@link setFileName 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>
* @package System.Caching
* @since 3.1.0
*/
class TFileCacheDependency extends TCacheDependency
{
private $_fileName;
private $_timestamp;
/**
* Constructor.
* @param string name of the file whose change is to be checked.
*/
public function __construct($fileName)
{
$this->setFileName($fileName);
}
/**
* @return string the name of the file whose change is to be checked
*/
public function getFileName()
{
return $this->_fileName;
}
/**
* @param string the name of the file whose change is to be checked
*/
public function setFileName($value)
{
$this->_fileName=$value;
$this->_timestamp=@filemtime($value);
}
/**
* @return int the last modification time of the file
*/
public function getTimestamp()
{
return $this->_timestamp;
}
/**
* Performs the actual dependency checking.
* This method returns true if the last modification time of the file is changed.
* @return boolean whether the dependency is changed or not.
*/
public function getHasChanged()
{
return @filemtime($this->_fileName)!==$this->_timestamp;
}
}
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