eZ\Publish\Core\FieldType\Image\Type::checkValueStructure PHP Метод

    protected function checkValueStructure(BaseValue $value)
    {
        if (isset($value->inputUri) && !is_string($value->inputUri)) {
            throw new InvalidArgumentType('$value->inputUri', 'string', $value->inputUri);
        }
        if (isset($value->id) && !is_string($value->id)) {
            throw new InvalidArgumentType('$value->id', 'string', $value->id);
        }
        // Required parameter $fileName
        if (!isset($value->fileName) || !is_string($value->fileName)) {
            throw new InvalidArgumentType('$value->fileName', 'string', $value->fileName);
        }
        // Optional parameter $alternativeText
        if (isset($value->alternativeText) && !is_string($value->alternativeText)) {
            throw new InvalidArgumentType('$value->alternativeText', 'string', $value->alternativeText);
        }
        if (isset($value->fileSize) && (!is_int($value->fileSize) || $value->fileSize < 0)) {
            throw new InvalidArgumentType('$value->fileSize', 'int', $value->alternativeText);
        }
    }