public String calculate(CalculatorBean calculatorBean, String mnemonic)
{
if ("=".Equals(mnemonic)) {
// jeśli operacja i bufor jest dostępny to wartość przepisywana jest do drugiej liczby
if (calculatorBean.Operation != null && calculatorBean.Buffer != null) {
calculatorBean.SecondNumber = Double.Parse(calculatorBean.Buffer.ToString());
log.InfoFormat("Second number accepted: {0}", calculatorBean.SecondNumber);
}
// operacja zawsze czyści bufor
calculatorBean.Buffer = null;
// jeżeli dostępna jest operacja do wykonania, ale drugiej liczby nie ma, powtarzana jest pierwsza z liczb
if (calculatorBean.Operation != null && calculatorBean.SecondNumber == null) {
log.InfoFormat("First number copied to be second number : {0}", calculatorBean.FirstNumber);
calculatorBean.SecondNumber = calculatorBean.FirstNumber;
}
// jeżeli dwie liczby znajdują się w pamięci to wykonujemy na nich operację
if (calculatorBean.FirstNumber != null && calculatorBean.SecondNumber != null) {
Double result = calculatorBean.Operation(calculatorBean.FirstNumber.GetValueOrDefault(0),
calculatorBean.SecondNumber.GetValueOrDefault(0));
log.InfoFormat("Calucation result: {0}", result);
if (Double.IsInfinity(result) || Double.IsNaN(result)) {
CalculationException calculationException = new CalculationException();
log.Warn("Calcuation error!", calculationException);
throw calculationException;
}
log.InfoFormat("Result copied to first number: {0}", result);
calculatorBean.FirstNumber = result;
return CalculatorUtils.formatNumber(result);
}
}
return null;
}
public String calculate(CalculatorBean calculatorBean, String mnemonic)
{
if (MATH_OPERATIONS.ContainsKey(mnemonic)) {
Double? newValue = null;
if (calculatorBean.Buffer != null) {
newValue = Double.Parse(calculatorBean.Buffer.ToString());
if (calculatorBean.FirstNumber != null) {
log.InfoFormat("Accepted the second number to calculate: {0}", newValue);
calculatorBean.SecondNumber = newValue;
} else {
log.InfoFormat("Accepted the first number to calculate: {0}", newValue);
calculatorBean.FirstNumber = newValue;
}
calculatorBean.Buffer = null;
}
if (calculatorBean.Operation != null && calculatorBean.SecondNumber != null) {
newValue = calculatorBean.Operation(calculatorBean.FirstNumber.GetValueOrDefault(0),
calculatorBean.SecondNumber.GetValueOrDefault(0));
log.InfoFormat("Calucation result: {0}", newValue);
if (Double.IsInfinity(newValue.GetValueOrDefault(0)) || Double.IsNaN(newValue.GetValueOrDefault(0))) {
CalculationException calculationException = new CalculationException();
log.Warn("Calcuation error!", calculationException);
throw calculationException;
}
calculatorBean.FirstNumber = newValue;
calculatorBean.SecondNumber = null;
}
if (MATH_OPERATIONS.ContainsKey(mnemonic))
{
log.InfoFormat("Accepted the operation to calculate: {0}", mnemonic);
calculatorBean.Operation = MATH_OPERATIONS[mnemonic];
}
if (newValue != null) {
return CalculatorUtils.formatNumber(newValue.GetValueOrDefault(0));
}
}
return null;
}