factory.php

См. документацию.

<?php
namespace Bitrix\Main\Filter;
 
use Bitrix\Main;
 
class Factory
{
    protected static $methods = null;

    protected static function prepareMethods()
    {
        if(self::$methods === null)
        {
            self::$methods = [];
 
            $event = new Main\Event('main', 'OnBuildFilterFactoryMethods', []);
            $event->send();
 
            foreach($event->getResults() as $eventResult)
            {
                if($eventResult->getType() != Main\EventResult::SUCCESS)
                {
                    continue;
                }
 
                $resultParams = $eventResult->getParameters();
                if(isset($resultParams['callbacks']) && is_array($resultParams['callbacks']))
                {
                    foreach($resultParams['callbacks'] as $entityTypeName => $callback)
                    {
                        if(is_callable($callback))
                        {
                            self::$methods[$entityTypeName] = $callback;
                        }
                    }
                }
            }
        }
        return self::$methods;
    }

    public static function createEntityFilter($entityTypeName, array $settingsParams, array $additionalParams = null)
    {
        $methods = self::prepareMethods();
        if(isset($methods[$entityTypeName]))
        {
            $result = call_user_func_array($methods[$entityTypeName], [ $entityTypeName, $settingsParams, $additionalParams ]);
            if($result instanceof Filter)
            {
                return $result;
            }
        }
 
        throw new Main\NotSupportedException(
            "Entity type: '{$entityTypeName}' is not supported in current context."
        );
    }
}