ClearProperties: Bitrix method

      
<?php 
//  ClearProperties()
//  /dist/bitrix/modules/bizproc/classes/general/activity.php:129

    protected function ClearProperties()
    {
        $rootActivity = $this->GetRootActivity();
        $documentId = $rootActivity->GetDocumentId();
        $documentType = $this->GetDocumentType();
        /** @var CBPDocumentService $documentService */
        $documentService = $this->workflow->GetService("DocumentService");

        if (is_array($rootActivity->arPropertiesTypes) && count($rootActivity->arPropertiesTypes) > 0
            && is_array($rootActivity->arFieldTypes) && count($rootActivity->arFieldTypes) > 0)
        {
            foreach ($rootActivity->arPropertiesTypes as $key => $value)
            {
                if ($rootActivity->arFieldTypes[$value["Type"]]["BaseType"] == "file")
                {
                    foreach ((array) $rootActivity->arProperties[$key] as $v)
                    {
                        if (intval($v) > 0)
                        {
                            $iterator = \CFile::getByID($v);
                            if ($file = $iterator->fetch())
                            {
                                if ($file['MODULE_ID'] === 'bizproc')
                                    CFile::Delete($v);
                            }
                        }
                    }
                }

                $fieldType = \Bitrix\Bizproc\FieldType::normalizeProperty($value);
                if ($fieldTypeObject = $documentService->getFieldTypeObject($documentType, $fieldType))
                {
                    $fieldTypeObject->setDocumentId($documentId)
                                    ->clearValue($rootActivity->arProperties[$key]);
                }
            }
        }
    }