Composite Design Pattern

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Questions and Answers

What is the primary requirement for using the Composite pattern in an application?

  • The app's core model can be represented as a graph
  • The app's core model can be represented as a tree (correct)
  • The app has a large number of objects
  • The app uses a large amount of memory

What is the main challenge in calculating the total price of an order containing both products and boxes?

  • Determining the price of individual products
  • Determining the nesting level of the boxes
  • Unwrapping all the boxes to access the products
  • Knowing the classes of Products and Boxes being used (correct)

What is the result of using the direct approach to calculate the total price of an order?

  • It reduces the complexity of the code
  • It becomes too simple to implement
  • It becomes too awkward or impossible to implement (correct)
  • It becomes more efficient to implement

What is the primary benefit of using the Composite pattern in the ordering system?

<p>It enables the treatment of individual objects and compositions as a single unit (A)</p> Signup and view all the answers

What is a common scenario where the Composite pattern is useful?

<p>When working with a tree data structure (A)</p> Signup and view all the answers

What is the relationship between a Box and a Product in the ordering system?

<p>A Box contains multiple Products (A)</p> Signup and view all the answers

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Study Notes

Composite Pattern

  • The Composite pattern allows you to compose objects into tree structures and treat them as individual objects.
  • This pattern is suitable when the core model of an application can be represented as a tree.

Problem Scenario

  • Consider an ordering system with two types of objects: Products and Boxes.
  • A Box can contain multiple Products and smaller Boxes.
  • Smaller Boxes can also hold Products or other smaller Boxes, creating a nested structure.

Challenges in Calculating Total Price

  • Determining the total price of an order is complex due to the nested structure of Boxes.
  • The direct approach is impractical or impossible in programming due to:
    • Need to know the classes of Products and Boxes beforehand.
    • Need to consider the nesting level of Boxes and other details.
    • Inability to simply run a loop to calculate the total price.

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