Loyalty Points - Java

Attention.md

Loyalty Points (Java)

• You can use Gradle to create a Java Project - you can name it LoyaltyPoints.
• Copy PointsCalculatorTest.java under package loyaltyPoints within src/test/java
• Copy Tier.java, PrivilegeService.java, PointsCalculator.java and Customer.java under package loyaltyPoints within src/main/java
• Add JUnit4 or JUnit5 Jar or latest JUnit as a test dependency.
• Run the tests to get a green bar.

An airline has following rules for calculating bonus amount for loyalty points for a customer based on which tier they are in:

• If a customer is in Platinum tier, add 50% more points above regular points.
• If a customer is in Gold tier, add 30% more points above regular points.
• If a customer is in Silver tier, add 15% more points above regular points.
• If a customer is in Blue tier, then there are no bonus points, just regular points.
• Spending INR 100 earns a regular point.

I want to add Titanium Tier, that gives 75% more points above regular points, can you help me?

NOTE

If you are behind proxy, and use gradle as a build tool, you can add the following lines to gradle.properties:

systemProp.http.proxyHost=Proxy IP Address
SystemProp.http.proxyPort=83
systemProp.https.proxyHost=Proxy IP Address
SystemProp.https.proxyPort=83

Customer.java

package loyaltyPoints;

public class Customer {
  private Tier tier;
  private int points;

  public Tier getTier() {
    return tier;
  }
  public void setTier(Tier tier) {
    this.tier = tier;
  }
  public int getPoints() {
    return points;
  }
  public void setPoints(int points) {
    this.points = points;
  }
}

PointsCalculator.java

package loyaltyPoints;

public class PointsCalculator {
  private static float AMOUNT_PER_POINT = 100.00f;
	
  public int calculateTotalPoints(Tier tier, float amountSpent) {
    final float earnedPoints = earnedPoints(amountSpent);
    return (int)(earnedPoints + bonus(tier, earnedPoints));
  }

  private float earnedPoints(float amountSpent) {
    return amountSpent / AMOUNT_PER_POINT;
  }

  private float bonus(Tier tier, float earnedPoints) {
    if (tier == Tier.SILVER) {
      return 0.15f * earnedPoints;
    }
    if (tier == Tier.GOLD) {
      return 0.3f * earnedPoints;
    }
    if (tier == Tier.PLATINUM) {
      return 0.5f * earnedPoints;
    }
    return 0f;
  }
}

PointsCalculatorTest.java

package loyaltyPoints;

import static org.junit.Assert.*;

import org.junit.Test;

public class PointsCalculatorTest {
	
  private PointsCalculator calculator = new PointsCalculator();

  @Test
  public void blueCustomerEarnsNoBonusPoints() {
    assertEquals(0, calculator.calculateTotalPoints(Tier.BLUE, 99.99f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.BLUE, 100.00f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.BLUE, 199.99f));
    assertEquals(2, calculator.calculateTotalPoints(Tier.BLUE, 200.00f));
  }
	
  @Test
  public void silverCustomerEarns15PercentBonusPointsAboveBlueCustomer() {
    assertEquals(0, calculator.calculateTotalPoints(Tier.SILVER, 86.95f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.SILVER, 86.96f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.SILVER, 173.91f));
    assertEquals(2, calculator.calculateTotalPoints(Tier.SILVER, 173.92f));
  }

  @Test
  public void goldCustomerEarns30PercentBonusPointsAboveBlueCustomer() {
    assertEquals(0, calculator.calculateTotalPoints(Tier.GOLD, 76.92f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.GOLD, 76.93f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.GOLD, 153.84f));
    assertEquals(2, calculator.calculateTotalPoints(Tier.GOLD, 153.85f));
  }
	
  @Test
  public void platinumCustomerEarns50PercentBonusPointsOverBlueCustomer() {
    assertEquals(0, calculator.calculateTotalPoints(Tier.PLATINUM, 66.66f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.PLATINUM, 66.67f));
    assertEquals(1, calculator.calculateTotalPoints(Tier.PLATINUM, 133.33f));
    assertEquals(2, calculator.calculateTotalPoints(Tier.PLATINUM, 133.34f));
  }
}

PrivilegeService.java

package loyaltyPoints;

public class PrivilegeService {
  private PointsCalculator pointsCalculator = new PointsCalculator();

  public int loyaltyPoints(Customer customer, float amountSpent) {
    Tier tier = customer.getTier();
    int newPoints = pointsCalculator.calculateTotalPoints(tier, amountSpent);
    int oldPoints = customer.getPoints();
    customer.setPoints(oldPoints + newPoints);
    return customer.getPoints();
  }

  // Other public methods
  // Tier updateTier(Customer customer) {
  // ...
}

Tier.java

package loyaltyPoints;

enum Tier {
   PLATINUM, GOLD, SILVER, BLUE;
}

If you are behind proxy, and use gradle as a build tool, you can add the following lines to gradle.properties:

systemProp.http.proxyHost=Proxy IP Address
SystemProp.http.proxyPort=83
systemProp.https.proxyHost=Proxy IP Address
SystemProp.https.proxyPort=83