vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCacheFactory.php

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<?php

/**
 * Responsible for creating definition caches.
 */
class HTMLPurifier_DefinitionCacheFactory
{
    /**
     * @type array
     */
    protected $caches = array('Serializer' => array());

    /**
     * @type array
     */
    protected $implementations = array();

    /**
     * @type HTMLPurifier_DefinitionCache_Decorator[]
     */
    protected $decorators = array();

    /**
     * Initialize default decorators
     */
    public function setup()
    {
        $this->addDecorator('Cleanup');
    }

    /**
     * Retrieves an instance of global definition cache factory.
     * @param HTMLPurifier_DefinitionCacheFactory $prototype
     * @return HTMLPurifier_DefinitionCacheFactory
     */
    public static function instance($prototype = null)
    {
        static $instance;
        if ($prototype !== null) {
            $instance = $prototype;
        } elseif ($instance === null || $prototype === true) {
            $instance = new HTMLPurifier_DefinitionCacheFactory();
            $instance->setup();
        }
        return $instance;
    }

    /**
     * Registers a new definition cache object
     * @param string $short Short name of cache object, for reference
     * @param string $long Full class name of cache object, for construction
     */
    public function register($short, $long)
    {
        $this->implementations[$short] = $long;
    }

    /**
     * Factory method that creates a cache object based on configuration
     * @param string $type Name of definitions handled by cache