Assumptions:
Food, Book and Medicine are considered as essentials, whereas other items are considered as non essentials. An item is a Book, Food or Medicine if it is mentioned as such in the item name. Similarly, the item is Imported if it is mentioned as such in the item name.
The input is accepted in the following format:-
"{Quantity} {Type of Item} - {Item Name} at {Price}"
For example, the input can be as follows:-
- 1 Medicine BXF009 at 90
- 1 BXF0034 Imported Medicine at 180
Future scope:
As a part of future scope, the application should accept any food, book or medicine item without expecting a keyword (food, book or medicine) to be mentioned in the item name.
Development style:
The TDD model is used to develop the application, which is built on the Factory pattern.
The Factory pattern was selected considering the following reasons:-
- The application expects a few items to be exempted from sales tax. The Factory pattern helps us set rules for each item.
- In the future, more items could be exempted from sales tax.
- For example:- Clothes can be considered as an exempted item for sales tax in the future. The Factory pattern will allow us to add a new item for clothes.
- In the future, sales tax (maybe, at a reduced rate) can be applied to any of the currently exempted items.
- For example:- Books can have a sales tax of 3% in the future. The Factory pattern will allow us to add a reduced rate of sales tax for books without affecting the sales tax rate for the other items.
- Different rates of import tax for different items can be incorporated.
- For example:- Import tax for medicines may be reduced from 10% to 7% in the future. The Factory pattern will allow us to reduce the import tax rate for medicines alone without affecting the import tax rates for other items.
Compiling and building the application:
This is a Java Maven application, which can be complied and built using any Java 1.8 compiler. The com.shop.App class can be run as a Java application.