/** @todo - review usage to see if range enforcement / java type conversion is necessary */
@Override
public Object convertToTypeLimits(SessionInterface session, Object a) {
if (a == null) {
return null;
}
switch (typeCode) {
case Types.TINYINT:
case Types.SQL_SMALLINT:
case Types.SQL_INTEGER:
case Types.SQL_BIGINT:
return a;
case Types.SQL_REAL:
case Types.SQL_FLOAT:
case Types.SQL_DOUBLE:
return a;
case Types.SQL_NUMERIC:
case Types.SQL_DECIMAL:
BigDecimal dec = (BigDecimal) a;
if (scale != dec.scale()) {
dec = dec.setScale(scale, BigDecimal.ROUND_HALF_DOWN);
}
int valuePrecision = JavaSystem.precision(dec);
if (valuePrecision > precision) {
throw Error.error(ErrorCode.X_22003);
}
return dec;
default:
throw Error.runtimeError(ErrorCode.U_S0500, "NumberType");
}
}
@Override
public String convertToString(Object a) {
if (a == null) {
return null;
}
switch (this.typeCode) {
case Types.TINYINT:
case Types.SQL_SMALLINT:
case Types.SQL_INTEGER:
case Types.SQL_BIGINT:
return a.toString();
case Types.SQL_REAL:
case Types.SQL_DOUBLE:
double value = ((Double) a).doubleValue();
/** @todo - java 5 format change */
if (value == Double.NEGATIVE_INFINITY) {
return "-1E0/0";
}
if (value == Double.POSITIVE_INFINITY) {
return "1E0/0";
}
if (Double.isNaN(value)) {
return "0E0/0E0";
}
// START of VoltDB patch to comply literally with the SQL standard requirement
// that 0.0 be represented as a special cased "0E0"
// and NOT "0.0E0" as HSQL had been giving.
if (value == 0.0) {
return "0E0";
}
// END of VoltDB patch.
String s = Double.toString(value);
// ensure the engine treats the value as a DOUBLE, not DECIMAL
if (s.indexOf('E') < 0) {
// START of VoltDB patch to ALWAYS use proper E notation,
// with a proper single-non-zero-digit integer part.
// HSQL originally just had: s = s.concat("E0");
int decimalOffset = s.indexOf('.');
String optionalSign = (value < 0.0 ? "-" : "");
int leadingNonZeroOffset;
String decimalPart;
int exponent;
if (value > -10.0 && value < 10.0) {
if (value <= -1.0 || value >= 1.0) {
// OK -- exactly 1 leading digit. Done.
s = s.concat("E0");
return s;
}
// A zero leading digit, and maybe more zeros after the decimal.
// Search for a significant digit past the decimal point.
for (leadingNonZeroOffset = decimalOffset + 1;
leadingNonZeroOffset < s.length();
++leadingNonZeroOffset) {
if (s.charAt(leadingNonZeroOffset) != '0') {
break;
}
}
// Count 1 for the leading 0 but not for the decimal point.
exponent = decimalOffset - leadingNonZeroOffset;
// Since exact 0.0 was eliminated earlier,
// s.charAt(leadingNonZeroOffset) must be our leading non-zero digit.
// Rewrite 0.[0]*nn* as n.n*E-x where x is the number of leading zeros found
// BUT rewrite 0.[0]*n as n.0E-x where x is the number of leading zeros found.
if (leadingNonZeroOffset + 1 == s.length()) {
decimalPart = "0";
} else {
decimalPart = s.substring(leadingNonZeroOffset + 1);
}
} else {
// Too many leading digits.
leadingNonZeroOffset = optionalSign.length();
// Set the exponent to how far the original decimal point was from its target
// position, just after the leading digit. This is also the length of the
// string of extra integer part digits that need to be moved into the decimal part.
exponent = decimalOffset - (leadingNonZeroOffset + 1);
decimalPart =
s.substring(leadingNonZeroOffset + 1, exponent) + s.substring(decimalOffset + 1);
// Trim any trailing zeros from the result.
int lastIndex;
for (lastIndex = decimalPart.length() - 1; lastIndex > 0; --lastIndex) {
if (decimalPart.charAt(lastIndex) != '0') {
break;
}
}
if (lastIndex > 0 && decimalPart.charAt(lastIndex) == '0') {
decimalPart = decimalPart.substring(lastIndex);
}
}
s = optionalSign + s.charAt(leadingNonZeroOffset) + "." + decimalPart + "E" + exponent;
// END of VoltDB patch to use proper E notation,
}
return s;
case Types.SQL_NUMERIC:
case Types.SQL_DECIMAL:
return JavaSystem.toString((BigDecimal) a);
default:
throw Error.runtimeError(ErrorCode.U_S0500, "NumberType");
}
}
