refactor

Author: vijayinyoutube

lib/Business_Logic/Exceptions/exception_handlers.dart

@@ -1,25 +1,18 @@
-import 'package:flutter/material.dart';
-
-import '../../Presentation/Components/snack_bar.dart';
-
-enum ExceptionTypes {
- socketException,
- httpException,
- formatException,
- timeoutException
-}
+import 'dart:async';
+import 'dart:io';
 
 class ExceptionHandlers {
- String typeOfException(ExceptionTypes exceptionTypes) {
- switch (exceptionTypes) {
- case ExceptionTypes.socketException:
- return 'No internet connection.';
- case ExceptionTypes.httpException:
- return 'HTTP error occured.';
- case ExceptionTypes.formatException:
- return 'Invalid data format.';
- case ExceptionTypes.timeoutException:
- return 'Request timeout.';
+ getExceptionString(error) {
+ if (error is SocketException) {
+ return 'No internet connection.';
+ } else if (error is HttpException) {
+ return 'HTTP error occured.';
+ } else if (error is FormatException) {
+ return 'Invalid data format.';
+ } else if (error is TimeoutException) {
+ return 'Request timedout.';
+ } else {
+ return 'Unknown error occured.';
  }
  }
 }
@@ -56,4 +49,3 @@ class NotFoundException extends AppException {
  NotFoundException([String? message, String? url])
  : super(message, 'Page not found', url);
 }
-

lib/Data/API/base_client.dart

@@ -1,9 +1,9 @@
 import 'dart:async';
+
 import 'dart:convert';
-import 'dart:io';
+import 'package:http/http.dart' as http;
 
 import '../../Business_Logic/Exceptions/exception_handlers.dart';
-import 'package:http/http.dart' as http;
 
 class BaseClient {
  static const int timeOutDuration = 35;
@@ -15,14 +15,8 @@ class BaseClient {
  var response =
  await http.get(uri).timeout(const Duration(seconds: timeOutDuration));
  return _processResponse(response);
- } on SocketException {
- throw const SocketException('Socket exception');
- } on TimeoutException {
- throw ApiNotRespondingException('Server not responding.');
- } on FormatException {
- } on HttpException {
  } catch (e) {
- throw e.toString();
+ throw ExceptionHandlers().getExceptionString(e);
  }
  }
 
@@ -36,11 +30,9 @@ class BaseClient {
  .timeout(const Duration(seconds: timeOutDuration));
 
  return _processResponse(response);
- } on SocketException {
- } on TimeoutException {
- throw ApiNotRespondingException('Server not responding.');
- } on FormatException {
- } on HttpException {}
+ } catch (e) {
+ throw ExceptionHandlers().getExceptionString(e);
+ }
  }
 
  //DELETE
@@ -54,13 +46,13 @@ class BaseClient {
  var responseJson = response.body;
  return responseJson;
  case 400: //Bad request
- throw BadRequestException(response.body);
+ throw BadRequestException(response.body).message.toString();
  case 401: //Unauthorized
- throw UnAuthorizedException(response.body);
+ throw UnAuthorizedException(response.body).message.toString();
  case 403: //Forbidden
- throw UnAuthorizedException(response.body);
+ throw UnAuthorizedException(response.body).message.toString();
  case 404: //Resource Not Found
- throw NotFoundException(response.body);
+ throw NotFoundException(response.body).message.toString();
  case 500: //Internal Server Error
  default:
  throw FetchDataException(

lib/Data/Repository/home_page_repo.dart

@@ -10,13 +10,8 @@ abstract class DemoRepository {
 class DemoRepo extends DemoRepository {
  @override
  Future<DemoModel> fetchData() async {
- try{
- final response =
+ final response =
  await BaseClient().get('${(dotenv.env['API_BASE_URL'])}/todos/1');
  return DemoModel.fromJson(response);
- }
- catch(e){
- throw e.toString();
- }
  }
 }

lib/Presentation/Components/future_builder.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+
+class FutureBuilderWidget extends StatelessWidget {
+ const FutureBuilderWidget({Key? key, required this.futureCall})
+ : super(key: key);
+
+ final Future futureCall;
+
+ @override
+ Widget build(BuildContext context) {
+ return FutureBuilder(
+ future: futureCall,
+ builder: (BuildContext context, snapshot) {
+ if (snapshot.hasData) {
+ return Text(snapshot.data.toString());
+ } else if (snapshot.hasError) {
+ return Text(snapshot.error.toString());
+ } else if (snapshot.connectionState == ConnectionState.waiting) {
+ return const Text('Waiting....');
+ } else if (snapshot.connectionState == ConnectionState.none) {
+ return const Text('cannot establish connection with the server.');
+ }
+ return const Center(child: CircularProgressIndicator());
+ },
+ );
+ }
+}

lib/Presentation/Screens/HomePage/UI/home_page.dart

@@ -1,4 +1,5 @@
-import 'package:api_exceptions_part2/Data/Repository/home_page_repo.dart';
+import '../../../../Data/Repository/home_page_repo.dart';
+import '../../../Components/future_builder.dart';
 import 'package:flutter/material.dart';
 
 class MyHomePage extends StatefulWidget {
@@ -18,20 +19,8 @@ class _MyHomePageState extends State<MyHomePage> {
  title: Text(widget.title),
  ),
  body: Center(
- child: ElevatedButton(
- onPressed: () => getData(),
- child: const Text('Fetch Data'),
- )),
+ child: FutureBuilderWidget(futureCall: DemoRepo().fetchData()),
+ ),
  );
  }
-
- Future<void> getData() async {
- print('getting data');
- try {
- var response = await DemoRepo().fetchData();
- print(response);
- } catch (e) {
- print(e.toString());
- }
- }
 }