Flutterexperts

In software development, the adapter design pattern, also known as Wrapper, is a popular structural design pattern. Check out my previous articles on the design pattern if you’re not sure what a design pattern is.

This blog will Explore Adapter Design Pattern In Flutter. We see how to execute a demo program in your Flutter applications.

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Table Of Contents::

What is the Adapter Design Pattern?

When to use?

Code Implement

Drawbacks

Conclusion

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What is the Adapter Design Pattern?

The Adapter design pattern, as described in the book “Design Patterns, Elements of Reusable Object-Oriented Software,” transforms a class’s interface into a different interface that clients expect. Classes that would not be able to work together without the adapter can now do so due to incompatible interfaces.

Let’s attempt to comprehend using a real-world example. Imagine that the music player in your car only plays cassettes, but you still want to listen to music on your smartphone. In this case, a cassette adaptor would be utilized. You can use your smartphone through the adapter’s interface, which also functions with the tape player.

We can therefore conclude that adapter design patterns are similar to actual adapters that provide a variety of functions.

When To use?

• In situations where you must utilize an existing class whose interface differs from your needs.
• When you wish to design a reusable class that works with unexpected or unrelated classes—that is, classes that may not have compatible interfaces.
• You can use an adapter to modify the interface of its parent class when it is not feasible to modify the interface of several existing subclasses by subclassing each one.

Code Implement

Let’s now attempt to comprehend using an example of code. Consider that you have two data sources at your disposal: UserAPI, which delivers data in JSON format, and EmployeeAPI, which gives data in XML format. But your application needs JSON-formatted data. The Adapter Design Pattern is applicable in this situation.

The XML data from EmployeeAPI can be converted into JSON format by creating an adapter called XMLToJSONAdapter. Even though the original data formats were different, this enables your application to handle data from both APIs consistently.

import 'dart:convert';

abstract class JSONDataInterface {
  String getData();
}

class UserAPI implements JSONDataInterface {
  @override
  String getData() {
    return jsonEncode({"name": "Sam", "age": 25});
  }
}

class EmployeeAPI {
  String getData() {
    return "<employee><name>Roy</name><age>22</age></employee>";
  }
}

class XMLToJSONAdapter implements JSONDataInterface {
  EmployeeAPI _employeeApi;
  XMLToJSONAdapter(this._employeeApi);

  @override
  String getData() {
    var xmlData = _employeeApi.getData();
    var name = xmlData.split("<name>")[1].split("</name>")[0];
    var age = xmlData.split("<age>")[1].split("</age>")[0];
    var jsonData = jsonEncode({"name": name, "age": age});
    return jsonData;
  }
}

void displayData(JSONDataInterface api) {
  print(api.getData());
}

void main() {
  var userApi = UserAPI();
  var employeeApi = EmployeeAPI();
  var adapter = XMLToJSONAdapter(employeeApi);

  displayData(userApi); 
  displayData(adapter);
}

When we run the application, we ought to get the screen’s output like the underneath console output.

{"name":"Sam","age":25}
{"name":"Roy","age":"22"}

Process finished with exit code 0

EmployeeAPI returns XML data, whereas UserAPI returns JSON data directly. To make the XML data from EmployeeAPI compatible with the rest of the system that requires JSON data, the XMLToJSONAdapter class transforms it into JSON format.

Drawbacks:

• By adding numerous small, related classes, the Adapter Pattern can complicate the program structure and make it more difficult to understand the code at first look.
• Performance-wise, data adaptation can be costly, particularly when working with big data sets or intricate data structures.

Conclusion:

In the article, I have explained the Adapter Design Pattern basic structure in a flutter; you can modify this code according to your choice. This was a small introduction to the Adapter Design Pattern On User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying the Explore Adapter Design Pattern in your Flutter projects. To guarantee compatibility across classes with mismatched interfaces, the Adapter Design Pattern is helpful. It makes it easier to combine new classes with old code by increasing the flexibility and reusability of existing code. So please try it.

❤ ❤ Thanks for reading this article ❤❤

If I got something wrong? Let me know in the comments. I would love to improve.

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