/**
* Given the parsing context and what numerical data type is expected convert a string to the
* correct type. Note no attempt is made to let the magnitude of the number influence our choice.
*
* @param string The string to convert to a number. E.g. "123.3e2". If it contains a '.' or an 'e'
* then the type must either be f or F.
* @param requiredType Either z, Z, f, F or any.
* @param tb The source. The cursor will be at the end of the number but any type specifier will
* not have been consumed. If there is one then we'll eat it.
* @return The derived type.
* @throws ParsingException If there is a clash of types.
*/
private static Object deriveType(String string, DataType requiredType, Text t, int radix) {
final Object result;
// Figure out the correct type...
final DataType derivedType;
if (t.isEof()) {
if (requiredType == DataType.any) {
if (string.indexOf('.') >= 0 || string.indexOf('e') >= 0) {
derivedType = DataType.f;
} else {
derivedType = DataType.z;
}
} else {
derivedType = requiredType;
}
} else {
final char c = t.peek();
if (c == 'z' || c == 'Z' || c == 'f' || c == 'F') {
t.consume(c);
derivedType = DataType.valueOf(String.valueOf(c));
if (!(requiredType == DataType.any || requiredType == derivedType)) {
throw new ParsingException("Incompatible type: " + string + c);
}
} else {
if (requiredType == DataType.any) {
if (string.indexOf('.') >= 0 || string.indexOf('e') >= 0) {
derivedType = DataType.f;
} else {
derivedType = DataType.z;
}
} else {
derivedType = requiredType;
}
}
}
switch (derivedType) {
case z:
result = new Long(Long.parseLong(string, radix));
break;
case Z:
result = new BigInteger(string, radix);
break;
case f:
result = new Double(string);
break;
case F:
result = new BigDecimal(string);
break;
// $CASES-OMITTED$
default:
throw new UnexpectedException("toType: " + derivedType);
}
return result;
}
/**
* Can't override valueOf() so uUse this method instead as it treats boolean properly. If an error
* is detected the Advisory is updated.
*
* @param key The key to look up.
* @return The DataType associated with the given key.
*/
public static DataType valueOfCorrected(String key) {
DataType result;
try {
if ("boolean".equals(key)) {
result = bool;
} else {
result = DataType.valueOf(key);
}
} catch (final IllegalArgumentException e) {
// todo Perhaps throw the catch when the Locus is known?
final Advisory advisory = Context.get(Advisory.class);
advisory.error("Invalid data type: " + key);
result = any;
}
return result;
}
