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Statistics.java
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Statistics.java
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import java.util.List;
import java.util.ArrayList;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import java.text.DecimalFormat;
import javafx.scene.chart.*;
import java.util.Comparator;
/**
* This class contains all the statistics used in the statistics panel
*
* @author (your name)
* @version (a version number or a date)
*/
public class Statistics
{
private List<AirbnbListing> listings = new ArrayList<>();
private double avgNumOfReviews;
private int totalAvailProperties;
private int numOfHomesAndApts;
private String mostExpBorough;
private ObservableList<PieChart.Data> prprtiesInEachBrgh;
/**
* Constructor for objects of class Statistics
*/
public Statistics(ArrayList<AirbnbListing> listings)
{
this.listings = listings;
prprtiesInEachBrgh = FXCollections.observableArrayList();
}
/**
* Updates the statistics
*/
public void updateStatistics(ArrayList<AirbnbListing> listings)
{
this.listings = listings;
resetStatistics();
AvgNumOfReviews();
totalAvailProperties();
numOfHomesAndApts();
mostExpensiveBorough();
propertiesInEachBorough();
}
/**
* Resets all the statistics
*/
private void resetStatistics()
{
avgNumOfReviews = 0;
totalAvailProperties = 0;
numOfHomesAndApts = 0;
mostExpBorough = "";
prprtiesInEachBrgh.clear();
}
/**
* Calculates the average number of reviews
*/
private void AvgNumOfReviews()
{
int count = 0;
double reviewTotal = 0;
for (AirbnbListing aListing : listings){
count++;
reviewTotal += aListing.getNumberOfReviews();
}
avgNumOfReviews = reviewTotal/count;
}
/**
* Calculates the total number of available properties where the availability is
* greater than zero
*/
private void totalAvailProperties()
{
for (AirbnbListing aListing : listings){
if (aListing.getAvailability365() > 0){
totalAvailProperties++;
}
}
}
/**
* Calculates the number of Homes and Apartments
*/
private void numOfHomesAndApts()
{
for (AirbnbListing aListing : listings){
if (aListing.getRoom_type().equalsIgnoreCase("Entire home/apt")){
numOfHomesAndApts++;
}
}
}
/**
* Finds the most expensive borough
*/
private void mostExpensiveBorough()
{
if (listings.isEmpty()) {
mostExpBorough = "No properties in this price range";
return;
}
listings = sortByBoroughAndRoom(listings);
int propertiesInBorough = 1;
int avgCost = 0;
int avgCostMostExpBorough = 0;
int totalMinPropertyPrice = 0;
String borough= listings.get(0).getNeighbourhood();
if(listings.size() == 1) {
mostExpBorough = borough;
}
else{
for (AirbnbListing aListing : listings){
if (!aListing.getNeighbourhood().equalsIgnoreCase(borough)){
avgCost = totalMinPropertyPrice/propertiesInBorough;
if(avgCost > avgCostMostExpBorough){
mostExpBorough = borough;
avgCostMostExpBorough = avgCost;
avgCost = 0;
}
borough = aListing.getNeighbourhood();
propertiesInBorough = 0;
}
totalMinPropertyPrice += aListing.getPrice() * aListing.getMinimumNights();
propertiesInBorough ++;
}
}
}
/**
* Calculates the number of properties in borough
*/
private void propertiesInEachBorough()
{
if (listings.isEmpty()) {
prprtiesInEachBrgh = null;
return;
}
ObservableList<PieChart.Data> data = FXCollections.observableArrayList();
String borough= listings.get(0).getNeighbourhood();
int propertiesInBorough = 1;
if (listings.size() == 1) {
data.add(new PieChart.Data(borough, propertiesInBorough));
}
listings = sortByBoroughAndRoom(listings);
for (AirbnbListing aListing : listings){
if (!aListing.getNeighbourhood().equalsIgnoreCase(borough)) {
if (propertiesInBorough >0){
data.add(new PieChart.Data(borough, propertiesInBorough));
}
borough = aListing.getNeighbourhood();
propertiesInBorough = 0;
}
else {
propertiesInBorough ++;
}
}
prprtiesInEachBrgh = data;
}
/**
* Returns a list of data containing the number of properties in a borough
*/
public ObservableList<PieChart.Data> getpropertiesInEachBorough()
{
return prprtiesInEachBrgh;
}
/**
* Calculates the number of different types of rooms and creates them as a bar to be
* part of a bar chart
*/
public ObservableList<XYChart.Series> getRoomTypeDistribution(String boroughName)
{
ArrayList<AirbnbListing> sortedList = getBoroughListings(boroughName);
ObservableList<XYChart.Series> data = FXCollections.observableArrayList();
String roomType = sortedList.get(0).getRoom_type();
int roomTypeCount = 1;
for (AirbnbListing aListing : sortedList){
if (!aListing.getRoom_type().equals(roomType)) {
data.add(addSeries(roomType, roomTypeCount));
roomType = aListing.getRoom_type();
roomTypeCount = 0;
}
else {
roomTypeCount ++;
}
}
data.add(addSeries(roomType, roomTypeCount));
return data;
}
/**
* Calculates the availability of properties in a borough and categorises them
* into 4 bars, 0-99, 100-99, 200-299, and 300+
* It then turns them into bars to be used to form a bar chart
*/
public ObservableList<XYChart.Series> getAvailDistribution(String boroughName)
{
ArrayList<AirbnbListing> sortedList = getBoroughListings(boroughName);
sortedList.sort(Comparator.comparing(AirbnbListing::getAvailability365));
String zero_99 = "0-99";
int first100 = 0;
String hundred_199 = "100-199";
int scnd100 = 0;
String twohundred_299 = "200-299";
int third100 = 0;
String threehundred = "300+";
int three100plus = 0;
ArrayList<String> ranges = new ArrayList();
ranges.add(zero_99);
ranges.add(hundred_199);
ranges.add(twohundred_299);
ranges.add(threehundred);
ObservableList<XYChart.Series> data = FXCollections.observableArrayList();
for (AirbnbListing aListing : sortedList){
if (aListing.getAvailability365() <= 99){
first100 ++;
}
else if (aListing.getAvailability365() >= 100 && aListing.getAvailability365() <= 199){
scnd100 ++;
}
else if (aListing.getAvailability365() >= 200 && aListing.getAvailability365() <= 299){
third100 ++;
}
else if (aListing.getAvailability365() >= 300){
three100plus ++;
}
}
ArrayList<Integer> rangeCount = new ArrayList();
rangeCount.add(first100);
rangeCount.add(scnd100);
rangeCount.add(third100);
rangeCount.add(three100plus);
int num = 0;
for (String range : ranges) {
data.add(addSeries(range, rangeCount.get(num)));
num++;
}
return data;
}
/**
* Creates a series for a barchart and sets the name of the series as type
*/
private XYChart.Series addSeries(String type, int typeCount)
{
XYChart.Series series = new XYChart.Series();
series.setName(type);
series.getData().add(new XYChart.Data<String, Number>(type, typeCount));
return series;
}
/**
* Filters a list by a borough passed in and then sorts its by room type
* in alphabetical order
*/
private ArrayList<AirbnbListing> getBoroughListings(String boroughName)
{
ArrayList<AirbnbListing> tempList = new ArrayList();
for (AirbnbListing aListing : listings){
if (aListing.getNeighbourhood().equalsIgnoreCase(boroughName)){
tempList.add(aListing);
}
}
tempList.sort(Comparator.comparing(AirbnbListing::getRoom_type));
return tempList;
}
/**
* This creates an and returns an arraylist containing the common features
* between the top 5 properties in a borough
*/
public ArrayList<String> mostPopListType(String boroughName)
{
ArrayList<AirbnbListing> sortedList = getBoroughListings(boroughName);
sortedList = getTopListings(sortedList);
if (sortedList.isEmpty()) {
ArrayList<String> empty = new ArrayList();
return empty;
}
double avgPrice = 0.0;
double avgMinNights = 0.0;
int privateRm = 0;
int entireHme = 0;
int sharedRm = 0;
for (AirbnbListing aListing : sortedList){
switch (aListing.getRoom_type()) {
case "Private room":
privateRm ++;
break;
case"Entire home/apt":
entireHme ++;
break;
case "Shared room":
sharedRm ++;
break;
}
avgPrice += aListing.getPrice();
avgMinNights += aListing.getMinimumNights();
}
ArrayList<String> common = new ArrayList();
if (avgPrice>0.0) {
avgPrice = avgPrice/sortedList.size();
common.add("Average Price: " + avgPrice);
}
else {
common.add("Average Price: No Properties" );
}
if (avgPrice>0.0) {
avgMinNights = avgMinNights/sortedList.size();
common.add("Average Minimum Nights: " + avgMinNights);
}
else {
common.add("Average Minimum Nights: No Properties" );
}
if (privateRm > entireHme && privateRm > sharedRm) {
common.add("Most Popular Room Type: Private room");
}
else if (entireHme > privateRm && entireHme > sharedRm) {
common.add("Most Popular Room Type: Entire home/apt");
}
else if (sharedRm > privateRm && sharedRm > entireHme) {
common.add("Most Popular Room Type: Shared room");
}
return common;
}
/**
* Returns an arraylist of the top 5 listings
* If the list passed in has less than 5 listings, it returns the list
*/
private ArrayList<AirbnbListing> getTopListings(ArrayList<AirbnbListing> listings)
{
listings.sort(Comparator.comparing(AirbnbListing::getReviewsPerMonth));
ArrayList<AirbnbListing> topListings = new ArrayList();
if (listings.size() >=5) {
int count = 5;
while (count > 0) {
topListings.add(listings.get((listings.size()-1) - count));
count --;
}
return topListings;
}
else {
return listings;
}
}
/**
* Sorts a list by Neighbourhood first and then room type
*/
private List<AirbnbListing> sortByBoroughAndRoom(List<AirbnbListing> listing)
{
listing.sort(Comparator.comparing(AirbnbListing::getNeighbourhood).
thenComparing(AirbnbListing::getRoom_type));
return listing;
}
/**
* Returns the average number of reviews
*/
public double getAvgNumOfReviews()
{
return avgNumOfReviews;
}
/**
* Returns the average number of reviews as a string to 2 decimal places
*/
public String getAvgNumOfReviewsString()
{
DecimalFormat number = new DecimalFormat("#0.00");
return "" + number.format(avgNumOfReviews);
}
/**
* Returns the total number of available properties
*/
public int getTotalAvailProperties()
{
return totalAvailProperties;
}
/**
* Returns the total number of available properties as a string
*/
public String getTotalAvailPropertiesString()
{
return "" + totalAvailProperties;
}
/**
* Returns the number of homes and apartments
*/
public int getNumOfHomesAndApts()
{
return numOfHomesAndApts;
}
/**
* Returns the number of homes and apartments as a string
*/
public String getNumOfHomesAndAptsString()
{
return "" + numOfHomesAndApts;
}
/**
* Returns the most expensive borough
*/
public String getMostExpBorough()
{
return mostExpBorough;
}
}