add rate service

lib/data/services/rate_imp.dart

@@ -0,0 +1,75 @@
+import 'package:fcs/data/provider/rate_data_provider.dart';
+import 'package:fcs/domain/entities/cargo_type.dart';
+import 'package:fcs/domain/entities/connectivity.dart';
+import 'package:fcs/domain/entities/discount_by_weight.dart';
+import 'package:fcs/domain/entities/custom_duty.dart';
+import 'package:fcs/domain/entities/rate.dart';
+import 'package:flutter/material.dart';
+
+import 'rate_service.dart';
+
+class RateServiceImp implements RateService {
+  RateServiceImp({
+    @required this.rateDataProvider,
+    @required this.connectivity,
+  });
+
+  final Connectivity connectivity;
+  final RateDataProvider rateDataProvider;
+
+  @override
+  Stream<Rate> getRateStream() {
+    return rateDataProvider.rate();
+  }
+
+  @override
+  Future<void> createCargoType(CargoType cargoType) {
+    return rateDataProvider.createCargoType(cargoType);
+  }
+
+  @override
+  Future<void> createCustomDuty(CustomDuty customDuty) {
+    return rateDataProvider.createCustomDuty(customDuty);
+  }
+
+  @override
+  Future<void> createDiscountByWeight(DiscountByWeight discountByWeight) {
+    return rateDataProvider.createDiscountByWeight(discountByWeight);
+  }
+
+  @override
+  Future<void> deleteCargoType(String id) {
+    return rateDataProvider.deleteCargoType(id);
+  }
+
+  @override
+  Future<void> deleteCustomDuty(String id) {
+    return rateDataProvider.deleteCustomDuty(id);
+  }
+
+  @override
+  Future<void> deleteDiscountByWeight(String id) {
+    return rateDataProvider.deleteDiscountByWeight(id);
+  }
+
+  @override
+  Future<void> updateCargoType(CargoType cargoType) {
+    return rateDataProvider.updateCargoType(cargoType);
+  }
+
+  @override
+  Future<void> updateCustomDuty(CustomDuty customDuty) {
+    return rateDataProvider.updateCustomDuty(customDuty);
+  }
+
+  @override
+  Future<void> updateDiscountByWeight(DiscountByWeight discountByWeight) {
+    return rateDataProvider.updateDiscountByWeight(discountByWeight);
+  }
+
+  @override
+  Future<void> updateRate(Rate rate) {
+    // TODO: implement updateRate
+    throw UnimplementedError();
+  }
+}