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castlese/Taxi Fare Calculator

Last active March 17, 2021 00:12
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Dublin taxi fare calculator written in java Input parameters: Journey distance (in km) Journey duration (in minutes, taken from Google Maps directions API) Current time (in milliseconds) Output parameters: An array of strings giving the following information: Minimum journey time (same as Journey duration input parameter) Minimum journey fare Ma…
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Taxi Fare Calculator
import java.util.Calendar;
public class TaxiFare {
private static final String DECIMAL_POINT = ".";
private static final String EMPTY_STRING = "";
/** DECLARATION OF CONSTANTS */
/** Standard Rate - between 8am and 8pm Mon - Sat excl Public Holidays */
private static final int MIN_KM = 1;
public static final int STD_INIT = 410; /** Initial Fare - includes 1km or 170 secs */
public static final int STD_TARIFF_A_KM = 103; /** Tariff A Rate per km */
public static final int STD_TARIFF_A_MIN = 36; /** Tarrif A Rate per minute */
public static final int STD_TARIFF_A_KM_MAX = 14; /** Tariff A maximum kms */
public static final int STD_TARIFF_B_KM = 135; /** Tariff B Rate per km */
public static final int STD_TARIFF_B_MIN = 48; /** Tarrif B Rate per minute */
public static final int STD_TARIFF_B_KM_MAX = 15; /** Tariff B maximum kms */
public static final int STD_TARIFF_C_KM = 177; /** Tariff C Rate per km */
public static final int STD_TARIFF_C_MIN = 63; /** Tarrif C Rate per minute */
public static final int STD_TARIFF_C_KM_MIN = 30; /** Tariff C minimum kms */
/**
* Premium Rate - between 8pm and 8am Mon to Sat, All Day Sunday and Public
* Holidays
*/
public static final int PREM_INIT = 445; /** Initial Fare - includes 1km or 170 secs */
public static final int PREM_TARIFF_A_KM = 135; /** Tariff A Rate per km */
public static final int PREM_TARIFF_A_MIN = 48; /** Tarrif A Rate per minute */
public static final int PREM_TARIFF_A_KM_MAX = 14; /** Tariff A maximum kms */
public static final int PREM_TARIFF_B_KM = 157; /** Tariff B Rate per km */
public static final int PREM_TARIFF_B_MIN = 55; /** Tarrif B Rate per minute */
public static final int PREM_TARIFF_B_KM_MAX = 15; /** Tariff B maximum kms */
public static final int PREM_TARIFF_C_KM = 177; /** Tariff C Rate per km */
public static final int PREM_TARIFF_C_MIN = 63; /** Tarrif C Rate per minute */
public static final int PREM_TARIFF_C_KM_MIN = 30; /** Tariff C minimum kms */
/** For peak times assume the following: */
public static final double TARRIF_A_PEAK_MINS_PER_KM = 2; /** stoppage time per km, Tarrif A */
public static final double TARRIF_B_PEAK_MINS_PER_KM = 0.5; /** stoppage time per km, Tarrif B */
public static final double TARRIF_C_PEAK_MINS_PER_KM = 0.1; /** stoppage time per km, Tarrif C */
public static final int TARRIF_A_MAX_KM = 9; /** maximum kms at Tarrif A */
public static final int TARRIF_B_MAX_KM = 17; /** maximum kms at Tarrif B */
private double distance;
private int duration;
private final Calendar datetime = Calendar.getInstance();
/**
* @journey = array of doubles that will represent taxi information
* @journey[0] = minimum time
* @journey[1] = minimum fare
* @journey[2] = maximum time
* @journey[3] = maximum fare Can include 'DateTime time' here too using an
* interface? Come back to later
*/
double[] journey = new double[4];
public final void setDistance(final double distance) {
this.distance = distance;
}
public final void setDuration(final int duration) {
this.duration = duration;
}
public final void setTimeInMillis(final long time) {
this.datetime.setTimeInMillis(time);
}
/**
* Initializer reads in distance and duration information
*
* @distance = journey distance in kms
* @duration = journey duration in minutes from Google Maps
*/
public TaxiFareupdate(final double dist, final int dur, final long time) {
distance = dist;
duration = dur;
datetime.setTimeInMillis(time);
}
public TaxiFareupdate() {
}
/**
* public method to call calculators depending and return array of fare
* information
*/
public String[] getTaxiInfo() {
final int faretype = setFareType();
switch (faretype) {
case 0:
minStandardFare();
maxStandardFare();
break;
case 1:
minPremiumFare();
maxPremiumFare();
break;
case 2:
minSpecialPremiumFare();
maxSpecialPremiumFare();
break;
}
/**
* Convert jourey to an array of strings, rounding also. Ensures that
* prices are properly formulated
*/
final String[] journeyString = new String[4];
journeyString[0] = EMPTY_STRING + (int) Math.floor(journey[0] / 60);
journeyString[0] = journeyString[0]
+ " : "
+ (int) Math.round(journey[0] - Math.floor(journey[0] / 60)
* 60);
;
journeyString[1] = EMPTY_STRING + (int) Math.floor(journey[1])
+ DECIMAL_POINT;
journeyString[1] = journeyString[1]
+ (int) Math.round((journey[1] - Math.floor(journey[1])) * 100);
journeyString[2] = EMPTY_STRING + (int) Math.floor(journey[2] / 60);
journeyString[2] = journeyString[2]
+ " : "
+ (int) Math.round(journey[2] - Math.floor(journey[2] / 60)
* 60);
;
journeyString[3] = EMPTY_STRING + (int) Math.floor(journey[3])
+ DECIMAL_POINT;
journeyString[3] = journeyString[3]
+ (int) Math.round((journey[3] - Math.floor(journey[3])) * 100);
return journeyString;
}
/**
* private method which returns the fare type based on current date and time
*************************************/
private int setFareType() {
final int hour = datetime.get(Calendar.HOUR_OF_DAY);
final int day = datetime.get(Calendar.DAY_OF_WEEK);
final int date_day = datetime.get(Calendar.DATE);
final int month = datetime.get(Calendar.MONTH);
int rate;
if ((hour >= 20 && hour < 8) || day == 1) {
rate = 1;
/**
* Represents Premium Rate (8pm - 8am Mon to Sat and all day Sunday)
*/
} else if ((date_day == 24 && month == 11 && hour >= 20)
|| (date_day == 25 && month == 11)
|| (date_day == 26 && month == 11 && hour < 8)
|| (date_day == 31 && month == 11 && hour >= 20)
|| (date_day == 1 && month == 0 && hour < 8)) {
rate = 2;
/** Represents Special Premium Rate around Christmas Time */
} else {
rate = 0;
/** Represents the Standard Rate */
}
return rate;
}
/**
* applies 8am to 8pm Mon to Sat excl. public holidays private method to set
* the min time and min fare elements of the journey array
*/
private void minStandardFare() {
double dist_temp = distance;
double min_fare = STD_INIT;
/** minimum fare */
if (distance <= MIN_KM) {
journey[0] = duration;
journey[1] = min_fare / 100;
}
/** Up to Tariff A fare */
else if (distance > MIN_KM
&& distance <= (MIN_KM + STD_TARIFF_A_KM_MAX)) {
dist_temp = dist_temp - MIN_KM;
min_fare += (dist_temp * STD_TARIFF_A_KM);
journey[0] = duration;
journey[1] = min_fare / 100;
}
/** Up to Tariff B Fare */
else if (distance > (MIN_KM + STD_TARIFF_A_KM_MAX)
&& distance <= (MIN_KM + STD_TARIFF_A_KM_MAX + STD_TARIFF_B_KM_MAX)) {
dist_temp = dist_temp - MIN_KM;
min_fare += (STD_TARIFF_A_KM_MAX * STD_TARIFF_A_KM);
dist_temp = dist_temp - STD_TARIFF_A_KM_MAX;
min_fare += (dist_temp * STD_TARIFF_B_KM);
journey[0] = duration;
journey[1] = min_fare / 100;
}
/** Up to Tariff C Fare */
else if (distance > STD_TARIFF_C_KM_MIN) {
dist_temp = dist_temp - MIN_KM;
min_fare += (dist_temp * STD_TARIFF_A_KM);
dist_temp = dist_temp - STD_TARIFF_A_KM_MAX;
min_fare += (dist_temp * STD_TARIFF_B_KM);
dist_temp = dist_temp - STD_TARIFF_B_KM_MAX;
min_fare += (dist_temp * STD_TARIFF_C_KM);
journey[0] = duration;
journey[1] = min_fare / 100;
}
else {
}
}
private void maxStandardFare() {
double dist_temp = distance;
double max_duration = duration + TARRIF_A_PEAK_MINS_PER_KM;
double max_fare = STD_INIT
+ (TARRIF_A_PEAK_MINS_PER_KM * STD_TARIFF_A_MIN);
/** minimum fare */
if (distance <= MIN_KM) {
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tariff A fare */
else if (distance > MIN_KM && distance <= TARRIF_A_MAX_KM) {
dist_temp = dist_temp - MIN_KM;
max_duration += dist_temp * TARRIF_A_PEAK_MINS_PER_KM;
max_fare += (dist_temp * STD_TARIFF_A_KM + (max_duration - duration - TARRIF_A_PEAK_MINS_PER_KM)
* STD_TARIFF_A_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tariff B Fare */
else if (distance > TARRIF_A_MAX_KM && distance <= TARRIF_B_MAX_KM) {
max_duration += (TARRIF_A_MAX_KM - MIN_KM)
* TARRIF_A_PEAK_MINS_PER_KM;
max_fare += (TARRIF_A_MAX_KM - MIN_KM)
* (STD_TARIFF_A_KM + TARRIF_A_PEAK_MINS_PER_KM
* STD_TARIFF_A_MIN);
dist_temp = dist_temp - (TARRIF_A_MAX_KM);
max_duration += dist_temp * TARRIF_B_PEAK_MINS_PER_KM;
max_fare += (dist_temp * STD_TARIFF_B_KM + dist_temp
* TARRIF_B_PEAK_MINS_PER_KM * STD_TARIFF_B_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tariff C Fare */
else if (distance > TARRIF_B_MAX_KM) {
max_duration += (TARRIF_A_MAX_KM - MIN_KM)
* TARRIF_A_PEAK_MINS_PER_KM;
max_fare += (TARRIF_A_MAX_KM - MIN_KM)
* (STD_TARIFF_A_KM + TARRIF_A_PEAK_MINS_PER_KM
* STD_TARIFF_A_MIN);
max_duration += (TARRIF_B_MAX_KM - TARRIF_A_MAX_KM)
* TARRIF_B_PEAK_MINS_PER_KM;
max_fare += (TARRIF_B_MAX_KM - TARRIF_A_MAX_KM)
* (STD_TARIFF_B_KM + TARRIF_B_PEAK_MINS_PER_KM
* STD_TARIFF_B_MIN);
dist_temp = dist_temp - (TARRIF_B_MAX_KM);
max_duration += dist_temp * TARRIF_C_PEAK_MINS_PER_KM;
max_fare += (dist_temp * STD_TARIFF_C_KM + dist_temp
* TARRIF_C_PEAK_MINS_PER_KM * STD_TARIFF_C_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
else {
}
}
/** applies 8pm to 8am Mon to Sat, All day Sunday & Public Holidays */
public void minPremiumFare() {
double dist_temp = distance;
double minfare = PREM_INIT;
/** minimum premium fare */
if (distance <= MIN_KM) {
journey[0] = duration;
journey[1] = minfare / 100;
}
/** up to Tariff A Premium Fare */
else if (distance > MIN_KM
&& distance <= (MIN_KM + PREM_TARIFF_A_KM_MAX)) {
dist_temp = dist_temp - MIN_KM;
minfare += (dist_temp * PREM_TARIFF_A_KM);
journey[0] = duration;
journey[1] = minfare / 100;
}
/** Up to Tariff B Premium fare */
else if (distance > (MIN_KM + PREM_TARIFF_A_KM_MAX)
&& distance <= (MIN_KM + PREM_TARIFF_A_KM_MAX + PREM_TARIFF_B_KM_MAX)) {
dist_temp = dist_temp - MIN_KM;
minfare += (PREM_TARIFF_A_KM_MAX * PREM_TARIFF_A_KM);
dist_temp = dist_temp - PREM_TARIFF_A_KM_MAX;
minfare += (dist_temp * PREM_TARIFF_B_KM);
journey[0] = duration;
journey[1] = minfare / 100;
}
/** Up to Tariff C Premium Fare */
else if (distance > MIN_KM + PREM_TARIFF_A_KM_MAX
+ PREM_TARIFF_B_KM_MAX) {
dist_temp = dist_temp - MIN_KM;
minfare += (dist_temp * PREM_TARIFF_A_KM);
dist_temp = dist_temp - PREM_TARIFF_A_KM_MAX;
minfare += (dist_temp * PREM_TARIFF_B_KM);
dist_temp = dist_temp - PREM_TARIFF_B_KM_MAX;
minfare += (dist_temp * PREM_TARIFF_C_KM);
journey[0] = duration;
journey[1] = minfare / 100;
}
else {
}
}
private void maxPremiumFare() {
double dist_temp = distance;
double max_duration = duration + TARRIF_A_PEAK_MINS_PER_KM;
double max_fare = PREM_INIT
+ (TARRIF_A_PEAK_MINS_PER_KM * PREM_TARIFF_A_MIN);
/** minimum fare */
if (distance <= MIN_KM) {
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tariff A fare */
else if (distance > MIN_KM && distance <= TARRIF_A_MAX_KM) {
dist_temp = dist_temp - MIN_KM;
max_duration += dist_temp * TARRIF_A_PEAK_MINS_PER_KM;
max_fare += (dist_temp * PREM_TARIFF_A_KM + max_duration
* PREM_TARIFF_A_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tariff B Fare */
else if (distance > TARRIF_A_MAX_KM && distance <= TARRIF_B_MAX_KM) {
max_duration += (TARRIF_A_MAX_KM - MIN_KM)
* TARRIF_A_PEAK_MINS_PER_KM;
max_fare += (TARRIF_A_MAX_KM - MIN_KM)
* (PREM_TARIFF_A_KM + TARRIF_A_PEAK_MINS_PER_KM
* PREM_TARIFF_A_MIN);
dist_temp = dist_temp - (TARRIF_A_MAX_KM);
max_duration += dist_temp * TARRIF_B_PEAK_MINS_PER_KM;
max_fare += (dist_temp * PREM_TARIFF_B_KM + dist_temp
* TARRIF_B_PEAK_MINS_PER_KM * PREM_TARIFF_B_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tariff C Fare */
else if (distance > TARRIF_B_MAX_KM) {
max_duration += (TARRIF_A_MAX_KM - MIN_KM)
* TARRIF_A_PEAK_MINS_PER_KM;
max_fare += (TARRIF_A_MAX_KM - MIN_KM)
* (PREM_TARIFF_A_KM + TARRIF_A_PEAK_MINS_PER_KM
* PREM_TARIFF_A_MIN);
max_duration += (TARRIF_B_MAX_KM - TARRIF_A_MAX_KM)
* TARRIF_B_PEAK_MINS_PER_KM;
max_fare += (TARRIF_B_MAX_KM - TARRIF_A_MAX_KM)
* (PREM_TARIFF_B_KM + TARRIF_B_PEAK_MINS_PER_KM
* PREM_TARIFF_B_MIN);
dist_temp = dist_temp - (TARRIF_B_MAX_KM);
max_duration += dist_temp * TARRIF_C_PEAK_MINS_PER_KM;
max_fare += (dist_temp * PREM_TARIFF_C_KM + dist_temp
* TARRIF_C_PEAK_MINS_PER_KM * PREM_TARIFF_C_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
else {
}
}
/**
* Applies 8pm Christmas Eve to 8am St. Stephen's Day and 8pm New Year's Eve
* to 8am New Year's Day
*/
public void minSpecialPremiumFare() {
double dist_temp = distance;
double min_fare = PREM_INIT;
if (distance <= MIN_KM) {
journey[0] = duration;
journey[1] = min_fare / 100;
}
/** Tarrif C fare */
else {
dist_temp = dist_temp - MIN_KM;
min_fare += (dist_temp * PREM_TARIFF_C_KM);
journey[0] = duration;
journey[1] = min_fare / 100;
}
}
private void maxSpecialPremiumFare() {
double dist_temp = distance;
double max_duration = duration + TARRIF_A_PEAK_MINS_PER_KM;
double max_fare = PREM_INIT
+ (TARRIF_A_PEAK_MINS_PER_KM * PREM_TARIFF_A_MIN);
/** minimum fare */
if (distance <= MIN_KM) {
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
/** Tarrif C fare */
else {
dist_temp = dist_temp - MIN_KM;
max_duration = dist_temp * TARRIF_B_PEAK_MINS_PER_KM;
/** TODO What minute rate to apply here????? */
max_fare += (dist_temp * PREM_TARIFF_C_KM + max_duration
* PREM_TARIFF_C_MIN);
journey[2] = max_duration;
journey[3] = max_fare / 100;
}
}
}
@rgrannell1
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thank you, this code is really helpful!

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