Hospice project

App.java

// Import all Java utils.
import java.util.*;

// Improt java lang.
import java.lang.*;



// Excercises.
public class App {

	// Main method
	public static void main( String[] args ) {

		// Instantiate the system.
		ShiftSystem system = new ShiftSystem();

		// Start counting the time.
		system.start();


		// Manual use case
		// ---------------------------

		// Create 3 nurses.
		Nurse n1 = new Nurse();
		Nurse n2 = new Nurse();
		Nurse n3 = new Nurse();

		// Add first nurse.
		system.addNurse(n1);

		// Do things on time.
		Timer timer = new Timer();

		// Add second nurse.
		timer.schedule(new TimerTask() {

			@Override
			public void run() {
				system.addNurse(n2);
			}

		}, 2000);

		// Add third nurse.
		timer.schedule(new TimerTask() {

			@Override
			public void run() {
				system.addNurse(n3);
			}

		}, 4000);

		// There are other methods that can be called.
		//
		// // Number of nurses in the hospice.
		// system.nursesInHospice();
		//
		// // Current nurse in turn.
		// system.nurseInTurn();
		//
		// // Time before a nurse is in turn.
		// system.timeBeforeTurnIsOn(n1.getId());
		//
		// // Occupy a nurse.
		// // Occupies the nurse currently in turn.
		// system.occupyNurse();
		//
		// // Frees a nurse.
		// system.freeNurse();
		//

	}

}

Hospice.java

// Import all Java utils.
import java.util.*;

// Improt java lang.
import java.lang.*;


//
// Hospice class.
//
public class Hospice {


	/**
	 * Name
	 */
	private String name;


	/**
	 * PossibleNames to name the hospice randomly.
	 */
	private String[] possibleNames = {
		"Hospice Mavericks",
		"Yosemite's Hospice",
		"Hospice Leopard",
		"Tiger's Hospice"
	};


	/**
	 * Constructor.
	 */
	public Hospice() {

		// Name
		Random rand = new Random();
		int min = 0;
		int max = 2;
		int i = rand.nextInt((max - min) + 1) + min;
		name = possibleNames[i];
	}


	/**
	 * String representation.
	 */
	public String toString() {
		return name;
	}


}

Nurse.java

// Import all Java utils.
import java.util.*;

// Improt java lang.
import java.lang.*;


// Nurse class.
//
// Hours are counted from 0 to 24.
//
public class Nurse {

	/**
	 * Id
	 */
	private String id;


	/**
	 * Whether this nurse is occupied with a pacient.
	 */
	private boolean occupied = false;


	/**
	 * Time in which the working day of
	 * this nurse finishes.
	 */
	public int endOfWorkingDay;


	/**
	 * Length of this nurse's turn in minutes.
	 * Default it to an hour.
	 */
	private int turnDuration;


	/**
	 * Time this nurse has left in turn.
	 */
	private int remainingTimeInTurn;


	/**
	 * Constructor.
	 */
	public Nurse() {

		// Generate a random id for this nurse.
		this.id = UUID.randomUUID().toString();

		// Hours are counted from 0 to 24.
		this.endOfWorkingDay = 1;

		// Default turn duration to 10.
		this.turnDuration = 10;


		// Set remaining time in turn equal to `turnDuration`.
		this.remainingTimeInTurn = this.turnDuration;
	}


	/**
	 * Returns nurse Id.
	 */
	public String getId() {
		return this.id;
	}


	/**
	 * Get end of working day in minutes.
	 */
	public int getEndOfWorkingDay() {
		return this.endOfWorkingDay * 60;
	}


	/**
	 * Occupies a nurse.
	 */
	public boolean occupy() {

		// Return false if this nurse is already occupied.
		if (this.occupied)
			return false;

		this.occupied = true;
		return true;
	}


	/**
	 * Checks if this nuerse is occupied.
	 */
	public boolean occupied() {
		return this.occupied;
	}


	/*
	 * Advances time on minute which means substracting one
	 * unit from `remainingTimeInTurn`.
	 */
	public int advanceTime() {
		this.remainingTimeInTurn -= 1;
		return this.remainingTimeInTurn;
	}

	/**
	 * Reset reimaining time in
	 */
	public void resetRemainingTime() {
		this.remainingTimeInTurn = this.turnDuration;
	}

	/**
	 * How much time does this nurse have left in their turn.
	 */
	public int timeLeftInTurn() {
		return this.remainingTimeInTurn;
	}



	/**
	 * Checks whether this nurse has finished thier turn,
	 * Which means that they have `remainingTimeInTurn` as 0.
	 */
	public boolean turnFinished() {
		return this.remainingTimeInTurn <= 0;
	}


	/**
	 * Checks whether the working day of this nurse
	 * if off given a time in minutes.
	 */
	public boolean isWorkingDayOff(int time) {
		return time >= this.endOfWorkingDay * 60;
	}


	/**
	 * Nurse string representation.
	 */
	public String toString() {
		return "Nurse: " + this.id;
	}

}

NurseList.java

// Import all Java utils.
import java.util.*;

// Improt java lang.
import java.lang.*;


// List of nurses.
//
// The list of nurses is actually an array list of `Nurse` objects
// but we're wrapping it on this class in order to call useful
// methods on it like adding a nurse to the list and others.
public class NursesList {

	/**
	 * List of nurses in turn.
	 */
	private ArrayList<Nurse> listOfNursesInTurn;

	/**
	 * List of nurses in hospice.
	 */
	private ArrayList<Nurse> listOfNurses;

	/**
	 * Elapsed time in minutes
	 */
	private int elapsedTime = 0;


	/**
	 * Constructor.
	 */
	public NursesList() {

		// By default we're going to allow 200 nurses at most.
		int listLength = 200;

		// Initialize list of nurses and nurses in turn.
		this.listOfNursesInTurn = new ArrayList<Nurse>();
		this.listOfNurses = new ArrayList<Nurse>();
	}


	/**
	 * Adds a nurse to the hospice and to the back of
	 * the list of nurses in turn.
	 */
	public boolean addNurse(Nurse nurse) {
		this.listOfNursesInTurn.add(nurse);
		this.listOfNurses.add(nurse);

		// Show the state of nurse list.
		printNurseList();
		return true;
	}


	/**
	 * Advance one minute in time.
	 */
	public void advanceMinute() {

		// Track time.
		this.elapsedTime += 1;

		// Go to the first nurse in the list and reduce their turn time.
		if (listOfNursesInTurn.size() > 0) {
			listOfNursesInTurn.get(0).advanceTime();

			// If the nurse in the head finished their turn, then,
			// rotate list.
			if (listOfNursesInTurn.get(0).turnFinished()) {
				listOfNursesInTurn.get(0).resetRemainingTime();
				Collections.rotate(listOfNursesInTurn, listOfNursesInTurn.size() -1);
			}
		}

		// If working day is off for this nurse, then take them
		// out of the hospice.
		for (int i = this.listOfNurses.size() - 1; i >= 0; i--)

			if (listOfNurses.get(i).isWorkingDayOff(this.elapsedTime)) {
				this.removeNurseFromTurn(listOfNurses.get(i).getId());
				this.listOfNurses.remove(i);
			}


		// Print the state of nurses list.
		printNurseList();

	}


	/**
	 * Removes a nurse from the list of nurses in turn.
	 */
	private void removeNurseFromTurn(String nurseId) {
		for (int i = this.listOfNursesInTurn.size() - 1; i >= 0; i--)

			if (listOfNursesInTurn.get(i).getId().equals(nurseId))
				listOfNursesInTurn.remove(i);

	}


	/**
	 * Returns the number of nurses that are there in the hospice.
	 */
	public int nursesInHospice() {
		return this.listOfNurses.size();
	}


	/**
	 * Returns the nurse that is currently in turn.
	 */
	public Nurse nurseInTurn() {
		if (listOfNursesInTurn.size() > 0)
			return listOfNursesInTurn.get(0);
		return null;
	}


	/**
	 * Returns how many time is remaining for a nurse
	 * to start their turn.
	 */
	public int timeBeforeTurnIsOn(String nurseId) {

		// Gets the specified nurse, find their index
		// in the list of nurses in turn, and sum the minutes
		// from all the nurses in front of them. That time
		// should be the remaining time overall.
		return 0;
	}


	/**
	 * Occupies the specified nurse.
	 */
	public Nurse occupyNurse() {

		// TODO: Get nurse in turn and occupy them.
		return null;
	}


	/**
	 * Frees a nurse
	 */
	public boolean freeNurse() {

		// TODO: Get nurse in turn and free them.
		return true;
	}


	/**
	 * Returns a nurse in the hospice given their ID.
	 */
	private Nurse getNurseById(String id) {
		if (listOfNurses.size() <= 0)
			return null;

		for (int i = 0; i < listOfNurses.size(); i++)
			if (listOfNurses.get(i).getId().equals(id))
				return listOfNurses.get(i);

		return null;
	}


	/**
	 * Prints the state of nurse list.
	 */
	private void printNurseList() {

		System.out.println("");
		System.out.println("\033[32m ------- Hospice -------- \033[0m");
		System.out.println("Elapsed mins -> " + this.elapsedTime);
		for (int i = 0; i < this.listOfNurses.size(); i++) {
			System.out.println(i + " -> off at " + this.listOfNurses.get(i).getEndOfWorkingDay());
		}

		System.out.println("------- List of nurses in turn --------");
		for (int i = 0; i < this.listOfNursesInTurn.size(); i++) {
			System.out.println(listOfNursesInTurn.get(i).getId() + " -> " + listOfNursesInTurn.get(i).timeLeftInTurn() + " mins left.");
		}
		System.out.println("---------------------------");
		System.out.println("");
	}

}

ShiftSystem.java

// Import all Java utils.
import java.util.*;

// Improt java lang.
import java.lang.*;


//
// System for managing shifts.
//
public class ShiftSystem {

	/**
	 * List of nurses.
	 */
	private NursesList nurseList;

	/**
	 * Hospice this system is working on.
	 */
	private Hospice hospice;


	/**
	 * Constructor.
	 */
	public ShiftSystem() {

		// Instantiate nurse list.
		this.nurseList = new NursesList();

		// Create a new hospice instance.
		this.hospice = new Hospice();
	}


	/**
	 * Starts counting the time.
	 */
	public void start() {
		System.out.println("Starting time ... \033[32m OK \033[0m");

		// Create a timer.
		Timer timer = new Timer();

		// Run timer.
		timer.scheduleAtFixedRate(new TimerTask() {

			//
			// Advance a *minute* every second.
			//
		  @Override
		  public void run() {
		    advanceMinute();
		  }

		}, 100, 100);
		// }, 1000, 1000);

	}

	/**
	 * Advances a minute in the system.
	 */
	public void advanceMinute() {
		nurseList.advanceMinute();
	}

	/**
	 * Adds a nurse to the system.
	 */
	public void addNurse(Nurse nurse) {
		this.nurseList.addNurse(nurse);
	}

	/**
	 * Returns how many nurses are there in the hospice.
	 */
	public int nursesInHospice() {
		return nurseList.nursesInHospice();
	}

	/**
	 * Return the nurse that is currently in turn.
	 */
	public Nurse nurseInTurn() {
		return nurseList.nurseInTurn();
	}


	/**
	 * Returns how much time is remaining for a
	 * nurse to start their turn.
	 */
	public int timeBeforeTurnIsOn(String nurseId) {
		return nurseList.timeBeforeTurnIsOn(nurseId);
	}


	/**
	 * Occupies a nurse.
	 *
	 * @return { Nurse || null } nurse currently in turn
	 *          or null if they're occupied already.
	 */
	public Nurse occupyNurse() {
		return nurseList.occupyNurse();
	}


	/**
	 * Frees a nurse.
	 */
	public boolean freeNurse() {
		return nurseList.freeNurse();
	}


}