add codebase for ParkingLot

LowLevelDesign/ParkingLot/ParkingLot.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

LowLevelDesign/ParkingLot/README.md

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+# Parking Lot Design
+## Problem Statement
+You own a parking lot of tech center where multiple company offices are co-located. You've design a parking space management system so as different companies cars/bikes can be parked in allocated slots. The employee of specific company should collect a ticket on entrance(if parking space is available) and pay the amount on exit from parking space.
+
+## System Requirements
+#### Vehicle Type
+1. Two wheeler - bikes
+2. Four wheeler - cars
+
+#### Levels on parking space
+The parking space can have multiple floors/levels
+

LowLevelDesign/ParkingLot/src/ParkingLotApplication.java

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+import com.msdeepsingh.parkinglot.model.gate.EntranceGate;
+import com.msdeepsingh.parkinglot.model.gate.ExitGate;
+import com.msdeepsingh.parkinglot.model.parking.*;
+import com.msdeepsingh.parkinglot.model.parkingticket.ParkingTicket;
+import com.msdeepsingh.parkinglot.model.vehicle.Vehicle;
+import com.msdeepsingh.parkinglot.model.vehicle.VehicleType;
+import com.msdeepsingh.parkinglot.service.impl.ParkingLotServiceImpl;
+import com.msdeepsingh.parkinglot.service.ticket.impl.TicketServiceImpl;
+import com.msdeepsingh.parkinglot.utility.ParkingUtility;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class ParkingLotApplication {
+    public static void main(String[] args) {
+        System.out.println("Welcome to Parking Lot!");
+
+        ParkingLot parkingLot = ParkingLot.getParkingLot();
+
+        ParkingLotServiceImpl parkingLotService = new ParkingLotServiceImpl(parkingLot);
+        TicketServiceImpl ticketService = new TicketServiceImpl();
+
+        //create parking spots
+        Map<Long, ParkingSpot> parkingSpotMap = new HashMap<>();
+        parkingSpotMap.put(1L, parkingLotService.addParkingSpot(ParkingUtility.createParkingSpot(1L, ParkingSpotType.FOUR_WHEELER), ParkingFloorNumber.GROUND));
+        parkingSpotMap.put(3L, parkingLotService.addParkingSpot(ParkingUtility.createParkingSpot(2L, ParkingSpotType.TWO_WHEELER), ParkingFloorNumber.GROUND));
+        parkingSpotMap.put(4L, parkingLotService.addParkingSpot(ParkingUtility.createParkingSpot(3L, ParkingSpotType.FOUR_WHEELER), ParkingFloorNumber.GROUND));
+        parkingSpotMap.put(5L, parkingLotService.addParkingSpot(ParkingUtility.createParkingSpot(4L, ParkingSpotType.TWO_WHEELER), ParkingFloorNumber.GROUND));
+
+        //create entry and entrance gate for ground floor
+        EntranceGate entranceGate = new EntranceGate(1L, ParkingFloorNumber.GROUND, true);
+        ExitGate exitGate = new ExitGate(2L, ParkingFloorNumber.GROUND, true);
+        Map<Long, EntranceGate> entranceGateMap = new HashMap<>();
+        entranceGateMap.put(1L, entranceGate);
+
+        Map<Long, ExitGate> exitGateMap = new HashMap<>();
+        exitGateMap.put(2L, exitGate);
+
+
+        //create Parking Floors
+        Map<ParkingFloorNumber, ParkingFloor> parkingFloorMap = new HashMap<>();
+        ParkingFloor groundParkingFloor = new ParkingFloor(ParkingFloorNumber.GROUND, parkingSpotMap, entranceGateMap, exitGateMap);
+        parkingFloorMap.put(ParkingFloorNumber.GROUND, groundParkingFloor);
+
+        //Initialize parking Lot with name identifier and parking floors information
+        parkingLot.setParkingLotId(UUID.randomUUID().toString());
+        parkingLot.setParkingLotName("Mandeep ka parking lot");
+        parkingLot.setParkingFloorMap(parkingFloorMap);
+
+        //create vehicle
+        Vehicle myHondaCar = new Vehicle("binaNumberWaliGadi", VehicleType.CAR);
+        Vehicle myHeroWaliMotorCycle = new Vehicle("127.0.0.1", VehicleType.BIKE);
+
+        //getParkingTicket
+        ParkingTicket carTicket = ticketService.getParkingTicket(myHondaCar, 1L);
+        System.out.println("Ticket generated successfully for vehicle: "+myHondaCar.getVehicleNo());
+        System.out.println("Ticket Details: "+carTicket);
+    }
+}

LowLevelDesign/ParkingLot/src/com/msdeepsingh/parkinglot/exception/NonRetryableException.java

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+package com.msdeepsingh.parkinglot.exception;
+
+public class NonRetryableException extends RuntimeException {
+    private String message;
+
+    public NonRetryableException(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}

LowLevelDesign/ParkingLot/src/com/msdeepsingh/parkinglot/exception/RetryableException.java

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+package com.msdeepsingh.parkinglot.exception;
+
+public class RetryableException extends RuntimeException {
+    private String message;
+
+    public RetryableException(String message) {
+        this.message = message;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}

LowLevelDesign/ParkingLot/src/com/msdeepsingh/parkinglot/model/gate/EntranceGate.java

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+package com.msdeepsingh.parkinglot.model.gate;
+
+import com.msdeepsingh.parkinglot.model.parking.ParkingFloorNumber;
+
+public class EntranceGate extends ParkingGate {
+
+    public EntranceGate(long gateNo, ParkingFloorNumber floorNo, boolean isOpen) {
+        super(gateNo, floorNo, isOpen);
+    }
+}

LowLevelDesign/ParkingLot/src/com/msdeepsingh/parkinglot/model/gate/ExitGate.java

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+package com.msdeepsingh.parkinglot.model.gate;
+
+import com.msdeepsingh.parkinglot.model.parking.ParkingFloorNumber;
+
+public class ExitGate extends ParkingGate {
+
+    public ExitGate(long gateNo, ParkingFloorNumber floorNo, boolean isOpen) {
+        super(gateNo, floorNo, isOpen);
+    }
+}

LowLevelDesign/ParkingLot/src/com/msdeepsingh/parkinglot/model/gate/ParkingGate.java

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+package com.msdeepsingh.parkinglot.model.gate;
+
+import com.msdeepsingh.parkinglot.model.parking.ParkingFloorNumber;
+
+public abstract class ParkingGate {
+    /**
+     * For unique representation of gates across the floor, the gate numbers are not repeated.
+     * */
+    private long gateNo;
+    private ParkingFloorNumber floorNo;
+    private boolean isOpen;
+
+    public ParkingGate(long gateNo, ParkingFloorNumber floorNo, boolean isOpen) {
+        this.gateNo = gateNo;
+        this.floorNo = floorNo;
+        this.isOpen = isOpen;
+    }
+
+    public long getGateNo() {
+        return gateNo;
+    }
+
+    public void setGateNo(long gateNo) {
+        this.gateNo = gateNo;
+    }
+
+    public ParkingFloorNumber getFloorNo() {
+        return floorNo;
+    }
+
+    public void setFloorNo(ParkingFloorNumber floorNo) {
+        this.floorNo = floorNo;
+    }
+
+    public boolean isOpen() {
+        return isOpen;
+    }
+
+    public void setOpen(boolean open) {
+        isOpen = open;
+    }
+}