/**
* Set odometer in string format, so that patterns can be parsed out (such as the '+' prefix
* notation. Note that if you are using this feature, the caller needs to set the vehicle ID
* before calling this in order to get the previous odometer value! Also, remember that this
* method is not free, due to the additional database lookup(s)!
*
* @param odometer The string representing the odometer value
*/
public void setOdometer(String odometer) throws NumberFormatException {
if (m_vehicleId < 0) {
throw new IllegalStateException(
"Need to set vehicle ID before calling setOdometer(String odometer)!");
}
if (odometer.startsWith("+")) {
// m_odometer must be maxed out for getPrevious() to work.
m_odometer = Double.MAX_VALUE;
FillUp previous = getPrevious();
if (previous == null) {
setOdometer(odometer.substring(1));
return;
}
m_odometer = previous.getOdometer() + Double.parseDouble(odometer.substring(1));
} else {
m_odometer = Double.parseDouble(odometer);
}
}
/**
* Calculates the distance since the previous fill-up.
*
* @return the distance since the previous fill-up
*/
public double calcDistance() {
if (m_distance == 0D) {
m_previous = getPrevious();
if (m_previous == null) {
// we're at the first fill-up, so there's nothing we can do
return -1D;
}
m_distance = m_odometer - m_previous.getOdometer();
}
return m_distance;
}
/**
* Calculates the fuel economy (based on the user's preferences) since the previous fill-up.
*
* @return the fuel economy since the previous fill-up.
*/
public double calcEconomy() {
if (m_partial) {
return -1D;
}
if (m_economy == 0D) {
FillUp previous = getPrevious();
if (previous == null) {
return -1D;
}
double distance = calcDistance();
double fuel = getAmount();
while (previous != null) {
if (previous.isPartial() == false) {
break;
}
// partial; we need to keep iterating
distance += previous.calcDistance();
fuel += previous.getAmount();
previous = previous.getPrevious();
}
m_economy = m_calculator.calculateEconomy(distance, fuel);
}
return m_economy;
}