public function getFieldType(AttributeInterface $attribute)
    {
        $type = FieldInterface::FIELD_TYPE_TEXT;

        if ($attribute->getSourceModel() == 'Magento\Eav\Model\Entity\Attribute\Source\Boolean') {
            $type = FieldInterface::FIELD_TYPE_BOOLEAN;
        } elseif ($attribute->getBackendType() == 'int') {
            $type = FieldInterface::FIELD_TYPE_INTEGER;
        } elseif ($attribute->getFrontendClass() == 'validate-digits') {
            $type = FieldInterface::FIELD_TYPE_LONG;
        } elseif ($attribute->getBackendType() == 'decimal' || $attribute->getFrontendClass() == 'validate-number') {
            $type = FieldInterface::FIELD_TYPE_DOUBLE;
        } elseif ($attribute->getBackendType() == 'datetime') {
            $type = FieldInterface::FIELD_TYPE_DATE;
        } elseif ($attribute->usesSource()) {
            $type = $attribute->getSourceModel() ? FieldInterface::FIELD_TYPE_KEYWORD : FieldInterface::FIELD_TYPE_INTEGER ;
        }

        return $type;
    }