public TypeValuePair evaluate(final FormulaContext context, final ParameterCallback parameters)
throws EvaluationException {
final int parameterCount = parameters.getParameterCount();
if (parameterCount < 1) {
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
}
final TypeRegistry typeRegistry = context.getTypeRegistry();
final double value =
typeRegistry.convertToNumber(parameters.getType(0), parameters.getValue(0)).doubleValue();
if (value == 0) {
return new TypeValuePair(TextType.TYPE, "0 ");
}
boolean fixedSize = false;
int precision = 0;
if (parameters.getParameterCount() > 1) {
fixedSize = true;
precision =
typeRegistry.convertToNumber(parameters.getType(1), parameters.getValue(1)).intValue();
if (parameters.getParameterCount() == 3) {
final Boolean rawFixedSize =
typeRegistry.convertToLogical(parameters.getType(2), parameters.getValue(2));
fixedSize = rawFixedSize.booleanValue();
}
}
final int log10 = computeLog10(value);
// index will allow us to find the the index of the suffix to use
final int index = (int) (Math.floor(log10 / 3.0) + OFFSET);
if (index < 0 || index >= SUFFIXES.length) {
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE);
}
// Find the adequate precision. % operator behaves badly in negative results, so we need to make
// it work as expected
final int roundPrecision =
fixedSize ? (log10 - precision) : (log10 - (precision + (3 + log10 % 3) % 3));
// Round the value
final double roundingScale = Math.pow(10, roundPrecision);
final double rounded = Math.round(value / roundingScale) * roundingScale;
// Get it's eng format. Get it as string without trailing 0's
final double outputValue = rounded / Math.pow(10, Math.floor(log10 / 3.0) * 3);
final int outputValueDecimalPlaces = Math.max(1, computeLog10(outputValue));
final Locale locale = context.getLocalizationContext().getLocale();
final NumberFormat decimalFormat =
createDecimalFormat(fixedSize, outputValueDecimalPlaces, precision, locale);
final String result = decimalFormat.format(outputValue) + SUFFIXES[index];
return new TypeValuePair(TextType.TYPE, result);
}
public TypeValuePair evaluate(final FormulaContext context, final TypeValuePair value)
throws EvaluationException {
final TypeRegistry typeRegistry = context.getTypeRegistry();
Boolean valBool = typeRegistry.convertToLogical(value.getType(), value.getValue());
if (!valBool.booleanValue()) {
return RETURN_TRUE;
} else {
return RETURN_FALSE;
}
}