amey1302 / UnusualSpends

Unusual Spends

Description :

You work at a credit card company and as a value-add they want to start providing alerts to users when their spending in any particular category is higher than usual.

• Compare the total amount paid for the current month, grouped by category with the previous month
• Filter down to the categories for which the user spent at least 50% more this month than last month
• Compose an e-mail message to the user that lists the categories for which spending was unusually high

OOMD Design for the Credit Card Company

OOMD For Unusual Spends

domain

• DTO

  • UnusualSpendingEmailAlertDTO

    • State

      • private Customer customer;
      • private Map<Category, Double> unusualSpends;
      • private double totalUnusualAmount;

• Exception

  • creditcardexception : contains all defined exceptions for creditCard Validation
  • customerexception : contains all defined exceptions for customer Data Validation
  • transactionexceptin : contains all defined exceptions for transaction Data Validation

• model

  • class Category: enum

  • class Customer

    • State

      • private final int id;
      • private final String name;
      • private final String email;
      • private CreditCard creditCard;

    • Behaviour

      • Smart Constructor
      • getters and setters

  • class CreditCard

    • State

      • private creditcardId : int
      • private List transactions

    • Behaviour

      • Smart Constructor
      • addTransaction
      • getters and setters

  • class Transaction

    • State

      • private final int transactionId;
      • private final LocalDate date;
      • private final double amount;
      • private final Category category;

    • Behaviour

      • Smart Constructor
      • Transaction Validations
      • getters and setters

  • class UnusualSpend

    • Behaviour

      • public static double getTotalAmountSpent()
      • public static List currentMonthTransactions(List transactions)
      • public static List previousMonthTransactions(List transactions)
      • public static Map<Category, Double> calculateUnusualSpend(List currentMonthTransactions, List previousMonthTransactions, double thresholdPercentage)
      • public static double totalUnusualAmountSpend(Map<Category, Double> unusualSpends)
      • public static Map<Category, Double> totalSpending(List transactions)

  • Services

    • class EmailAlert

      • Behaviour

        • public String sendEmail(String subject, String body, String customerEmailId)

    • class EmailAlertMessage

      • Behaviour

        • public static String generateUnusualSpendingEmail(UnusualSpendingEmailAlertDTO emailDTO)

• class CreditCardManager

  • Behaviour

    • public Customer createCustomer(int customerId, String customerName, String customerEmail)
    • public void createCreditCardForCustomer(int creditCardId, Customer customer)
    • public void createTransactionForACreditCard(int transactionId, LocalDate date, double amount, Category category, CreditCard creditCard)
    • public boolean analyzeUnusualSpendsFor(CreditCard creditCard)