67 lines
1.5 KiB
PHP
67 lines
1.5 KiB
PHP
<?php
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namespace SilverStripe\VersionFeed\Filters;
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use SilverStripe\VersionFeed\VersionFeedController;
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use SilverStripe\Core\Config\Configurable;
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use Psr\SimpleCache\CacheInterface;
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use SilverStripe\Core\Injector\Injector;
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/**
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* Conditionally executes a given callback, attempting to return the desired results
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* of its execution.
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*/
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abstract class ContentFilter
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{
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use Configurable;
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/**
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* Nested content filter
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*
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* @var ContentFilter
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*/
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protected $nestedContentFilter;
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/**
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* Cache lifetime
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*
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* @config
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* @var int
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*/
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private static $cache_lifetime = 300;
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public function __construct($nestedContentFilter = null)
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{
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$this->nestedContentFilter = $nestedContentFilter;
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}
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/**
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* Gets the cache to use
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*
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* @return Zend_Cache_Frontend
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*/
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protected function getCache()
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{
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return Injector::inst()->get(
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CacheInterface::class . '.VersionFeedController'
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);
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}
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/**
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* Evaluates the result of the given callback
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*
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* @param string $key Unique key for this
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* @param callable $callback Callback for evaluating the content
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* @return mixed Result of $callback()
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*/
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public function getContent($key, $callback)
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{
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if ($this->nestedContentFilter) {
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return $this->nestedContentFilter->getContent($key, $callback);
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} else {
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return call_user_func($callback);
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}
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}
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}
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