Project lint checked and step added to config.yml

lib/data/repository/repository_impl.dart

@@ -0,0 +1,46 @@
+import 'dart:io';
+
+import 'package:easy_cc_flutter/Utils/currency_utils.dart';
+import 'package:easy_cc_flutter/data/model/currency.dart';
+import 'package:easy_cc_flutter/data/prefs/currency_pair.dart';
+
+import '../../locator.dart';
+import '../../main.dart';
+import '../network/backup_currency_api.dart';
+import '../network/currency_api.dart';
+import '../network/safe_api_call.dart';
+import '../prefs/preference_provider.dart';
+import 'repository.dart';
+
+class RepositoryImpl extends Repository with SafeApiCall {
+  final PreferenceProvider _prefs = locator<PreferenceProvider>();
+  final CurrencyApi _api = locator<CurrencyApi>();
+  final BackupCurrencyApi _backupApi = locator<BackupCurrencyApi>();
+
+  @override
+  CurrencyPair getConversionPair() {
+    return _prefs.getConversionPair();
+  }
+
+  @override
+  Future<void> setConversionPair(String fromCurrency, String toCurrency) {
+    return _prefs.saveConversionPair(fromCurrency, toCurrency);
+  }
+
+  @override
+  Future<Currency> getConversationRateFromApi(String fromCurrency, String toCurrency) async {
+    String from = fromCurrency.getCurrencyCode();
+    String to = toCurrency.getCurrencyCode();
+
+    String currency = "${from}_$to";
+
+    try {
+      ResponseObject responseObject = await getDataFromApiCall(_api.getConversion(currency));
+      return responseObject.convert();
+    } on HttpException catch(error) {
+      logger.e(error);
+      CurrencyResponse responseObject = await getDataFromApiCall(_backupApi.getCurrencyRate(from, to));
+      return responseObject.convert();
+    }
+  }
+}