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<?php
/**
* CFilter class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CFilter is the base class for all filters.
*
* A filter can be applied before and after an action is executed.
* It can modify the context that the action is to run or decorate the result that the
* action generates.
*
* Override {@link preFilter()} to specify the filtering logic that should be applied
* before the action, and {@link postFilter()} for filtering logic after the action.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.web.filters
* @since 1.0
*/
class CFilter extends CComponent implements IFilter
{
/**
* Performs the filtering.
* The default implementation is to invoke {@link preFilter}
* and {@link postFilter} which are meant to be overridden
* child classes. If a child class needs to override this method,
* make sure it calls <code>$filterChain->run()</code>
* if the action should be executed.
* @param CFilterChain $filterChain the filter chain that the filter is on.
*/
public function filter($filterChain)
{
if($this->preFilter($filterChain))
{
$filterChain->run();
$this->postFilter($filterChain);
}
}
/**
* Initializes the filter.
* This method is invoked after the filter properties are initialized
* and before {@link preFilter} is called.
* You may override this method to include some initialization logic.
* @since 1.1.4
*/
public function init()
{
}
/**
* Performs the pre-action filtering.
* @param CFilterChain $filterChain the filter chain that the filter is on.
* @return boolean whether the filtering process should continue and the action
* should be executed.
*/
protected function preFilter($filterChain)
{
return true;
}
/**
* Performs the post-action filtering.
* @param CFilterChain $filterChain the filter chain that the filter is on.
*/
protected function postFilter($filterChain)
{
}
}
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