silverstripe-versionfeed/code/caching/ContentFilter.php
2014-04-29 16:51:23 +12:00

46 lines
1.0 KiB
PHP

<?php
/**
* Conditionally executes a given callback, attempting to return the desired results
* of its execution.
*/
abstract class ContentFilter {
/**
* Nested content filter
*
* @var ContentFilter
*/
protected $nestedContentFilter;
public function __construct($nestedContentFilter = null) {
$this->nestedContentFilter = $nestedContentFilter;
}
/**
* Gets the cache to use
*
* @return Zend_Cache_Frontend
*/
protected function getCache() {
$cache = SS_Cache::factory('VersionFeed_Controller');
$cache->setOption('automatic_serialization', true);
return $cache;
}
/**
* Evaluates the result of the given callback
*
* @param string $key Unique key for this
* @param callable $callback Callback for evaluating the content
* @return mixed Result of $callback()
*/
public function getContent($key, $callback) {
if($this->nestedContentFilter) {
return $this->nestedContentFilter->getContent($key, $callback);
} else {
return call_user_func($callback);
}
}
}