Added arn to the main repository

arn/HasMappings.go

@@ -0,0 +1,51 @@
+package arn
+
+// HasMappings implements common mapping methods.
+type hasMappings struct {
+	Mappings []*Mapping `json:"mappings" editable:"true"`
+}
+
+// SetMapping sets the ID of an external site to the obj.
+func (obj *hasMappings) SetMapping(serviceName string, serviceID string) {
+	// Is the ID valid?
+	if serviceID == "" {
+		return
+	}
+
+	// If it already exists we don't need to add it
+	for _, external := range obj.Mappings {
+		if external.Service == serviceName {
+			external.ServiceID = serviceID
+			return
+		}
+	}
+
+	// Add the mapping
+	obj.Mappings = append(obj.Mappings, &Mapping{
+		Service:   serviceName,
+		ServiceID: serviceID,
+	})
+}
+
+// GetMapping returns the external ID for the given service.
+func (obj *hasMappings) GetMapping(name string) string {
+	for _, external := range obj.Mappings {
+		if external.Service == name {
+			return external.ServiceID
+		}
+	}
+
+	return ""
+}
+
+// RemoveMapping removes all mappings with the given service name and ID.
+func (obj *hasMappings) RemoveMapping(name string) bool {
+	for index, external := range obj.Mappings {
+		if external.Service == name {
+			obj.Mappings = append(obj.Mappings[:index], obj.Mappings[index+1:]...)
+			return true
+		}
+	}
+
+	return false
+}