This document contains comprehensive notes from Lecture 15 of the CO2401 course on Software Development. The lecture focuses on Structural and Behavioral Design Patterns, which are essential tools for solving common software design problems in a flexible and reusable manner.
Structural Patterns
1. Composite Pattern
o Problem:
Used when an application’s model can be represented as a
tree structure, such as an order containing products packed
in boxes within boxes.
Challenge: Calculating the total price of such an order.
o Solution:
Use a common interface for both products and boxes, with a
method to calculate the total price.
For a product: Return its price.
For a box: Iterate over its contents, summing up prices,
including any additional costs like packaging.
2. When to Use:
o Implement a tree-like structure in your object model.
o Enable client code to treat simple and complex elements uniformly.
3. Pros and Cons:
o Benefits:
Simplifies working with complex tree structures.
Allows new element types to be added without breaking
existing code.
o Drawbacks:
Difficulty in providing a common interface for classes with
significantly different functionalities.
Adapter Pattern
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