dataprovider.php

См. документацию.

<?php
namespace Bitrix\Main\Filter;
 
abstract class DataProvider
{
    abstract public function getSettings();
    public function getID()
    {
        return $this->getSettings()->getID();
    }

    public abstract function prepareFields();
    public abstract function prepareFieldData($fieldID);
    public function prepareFieldHtml(Field $field)
    {
        return '';
    }

    public function prepareListFilterParam(array &$filter, $fieldID)
    {
    }

    public function prepareFilterValue(array $rawFilterValue): array
    {
        return $rawFilterValue;
    }

    protected function createField($fieldID, array $params = null)
    {
        if(!is_array($params))
        {
            $params = [];
        }
 
        if(!isset($params['name']))
        {
            $params['name'] = $fieldID;
        }
 
        return new Field($this, $fieldID, $params);
    }
}