HotBeverageMachine (UML Diagram)
In the first version of HotBeverageMachine I used the Strategy Design Pattern, and since then I have decided to restructure it with the following refactoring:
- Replace Constructors With Creation Methods
- Replace State-Altering Conditionals with State
- Collapse Hierarchy
- Move Embellishment to Decorator
The client that calls the constructor is in the TestHotBeverageMachine class. I replaced the constructor with an intention-revealing Creation Method, and I used the following refactorings to accomplish this task:
- Apply Extract Method [F] on the constructor call in the TestHotBeverageMachine class to produce a public, static creation method.
- Move Method [F] on this new method to move the extracted creation method to the HotBeverageMachine class.
- Updated all callers of the constructor.
In the first version I used different classes for all the coffee and tea beverages. In this new version I am using only one class for coffee, and only one class for tea. I used the following refactorings to accomplish this task:
- Pull Up Field [F] from all Beverage subclasses.
- Pull Up Method [F] from all Beverage subclasses.
I had initially used the Strategy Pattern with enums. However, I have since decided that refactoring to a State Pattern with concrete state objects would be more of an appropriate design for this application, and I used the following refactorings to accomplish this task:
- Replace Type Code with Class (but I first replaced the enums with string fields in the HotBeverageMachine context class before applying this refactoring to the type code in this context class). Also, I realize that an enum can be used with the State Pattern but I just decided against it.
- Extract SubClass [F] to produce the concrete MachineState classes.
- Updated delegation methods in the HotBeverageMachine context class
I implemented a new pattern, The Decorator Pattern, in this second version of HotBeverageMachine. I initially worked the feature request of adding condiments into the Strategy Pattern classes. However, I have since decided that the Decorator Pattern would be more appropriate.
1. Clone this repository
2. mvn clean compile test
1.0.0
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Copyright (c) 2019 Vincent Pasquariello
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