Class ShippingCostCalculator

java.lang.Object
com.university.bookstore.visitor.ShippingCostCalculator
All Implemented Interfaces:
MaterialVisitor
public class ShippingCostCalculator extends Object implements MaterialVisitor
Concrete visitor implementation for calculating shipping costs. Demonstrates the Visitor pattern by providing different shipping cost calculations based on material type.

Shipping costs vary by material type: - Physical items: $0.50 per 100g - Digital items: $0 (instant download) - Magazines: $2 flat rate

Since:
2024-09-15
Version:
2.0
Author:
Navid Mohaghegh

  • Constructor Details

    • ShippingCostCalculator

      public ShippingCostCalculator()

  • Method Details

    • visit

      public void visit(PrintedBook book)
      Calculates shipping cost for a printed book based on weight. Assumes average book weight of 500g.
      Specified by:
      visit in interface MaterialVisitor
      Parameters:
      book - the printed book

    • visit

      public void visit(Magazine magazine)
      Calculates flat rate shipping cost for magazines.
      Specified by:
      visit in interface MaterialVisitor
      Parameters:
      magazine - the magazine

    • visit

      public void visit(AudioBook audioBook)
      Calculates shipping cost for audio books. Physical CDs: weight-based, Digital: free
      Specified by:
      visit in interface MaterialVisitor
      Parameters:
      audioBook - the audio book

    • visit

      public void visit(VideoMaterial video)
      Calculates shipping cost for video materials. Physical DVDs: weight-based, Digital: free
      Specified by:
      visit in interface MaterialVisitor
      Parameters:
      video - the video material

    • visit

      public void visit(EBook ebook)
      Calculates shipping cost for e-books. E-books are always digital downloads with no shipping cost.
      Specified by:
      visit in interface MaterialVisitor
      Parameters:
      ebook - the e-book

    • getTotalShippingCost

      public double getTotalShippingCost()
      Gets the total shipping cost calculated so far.
      Returns:
      the total shipping cost

    • reset

      public void reset()
      Resets the shipping cost calculator for a new calculation.

    • calculateShippingCost

      public double calculateShippingCost(Material material)
      Calculates shipping cost for a single material.
      Parameters:
      material - the material to calculate shipping for
      Returns:
      the shipping cost for this material