feat(metadata): update UoM configuration struct

Signed-off-by: Chris Hung <chris@iotechsys.com>

cmd/core-metadata/res/uom.toml

@@ -1,9 +1,8 @@
-[Uom]
 Source="reference to source for all UoM if not specified below"
-  [Uom.Units]
-    [Uom.Units.temperature]
-    Source="www.weather.com"
-    Values=["C","F","K"]
-    [Uom.Units.weights]
-    Source="www.usa.gov/federal-agencies/weights-and-measures-division"
-    Values=["lbs","ounces","kilos","grams"]
+[Units]
+  [Units.temperature]
+  Source="www.weather.com"
+  Values=["C","F","K"]
+  [Units.weights]
+  Source="www.usa.gov/federal-agencies/weights-and-measures-division"
+  Values=["lbs","ounces","kilos","grams"]

internal/core/metadata/uom/uom.go

@@ -6,10 +6,6 @@
 package uom
 
 type UnitsOfMeasureImpl struct {
-	Uom ConfigurationStruct
-}
-
-type ConfigurationStruct struct {
 	Source string
 	Units  map[string]Unit
 }
@@ -20,11 +16,11 @@ type Unit struct {
 }
 
 func (u *UnitsOfMeasureImpl) Validate(unit string) bool {
-	if unit == "" || len(u.Uom.Units) == 0 {
+	if unit == "" || len(u.Units) == 0 {
 		return true
 	}
 
-	for _, units := range u.Uom.Units {
+	for _, units := range u.Units {
 		for _, v := range units.Values {
 			if unit == v {
 				return true