A String Encoding & Decoding API

You are required to develop a Java Encoding & Decoding API that can parse a file or a URL and encode the data using a variety of different algorithms. Your API should consist of a loosely-coupled design of highly cohesive classes that allow a programmer to quickly and easily exploit the underlying functionality exposed by your library. In addition to designing and implementing the API, you are also required to unit test your library using JUnit and provide an Ant build script with your submission. show good understanding of principles of object-oriented design by using abstraction, encapsulation, composition, inheritance and polymorphism WELL throughout the application.