GDS\Mapper\RESTv1::extractPropertyValue PHP Method

    protected function extractPropertyValue($int_type, $obj_property)
    {
        switch ($int_type) {
            case Schema::PROPERTY_STRING:
                return isset($obj_property->stringValue) ? $obj_property->stringValue : null;
            case Schema::PROPERTY_INTEGER:
                return isset($obj_property->integerValue) ? $obj_property->integerValue : null;
            case Schema::PROPERTY_DATETIME:
                return isset($obj_property->timestampValue) ? $this->extractDatetimeValue($obj_property) : null;
            case Schema::PROPERTY_DOUBLE:
            case Schema::PROPERTY_FLOAT:
                return isset($obj_property->doubleValue) ? $obj_property->doubleValue : null;
            case Schema::PROPERTY_BOOLEAN:
                return isset($obj_property->booleanValue) ? $obj_property->booleanValue : null;
            case Schema::PROPERTY_GEOPOINT:
                return isset($obj_property->geoPointValue) ? $this->extractGeopointValue($obj_property) : null;
            case Schema::PROPERTY_STRING_LIST:
                return $this->extractStringListValue($obj_property);
            case Schema::PROPERTY_DETECT:
                return $this->extractAutoDetectValue($obj_property);
        }
        throw new \Exception('Unsupported field type: ' . $int_type);
    }