Expression readDateTimeIntervalLiteral() {
int pos = getPosition();
switch (token.tokenType) {
case Tokens.DATE:
{
read();
if (token.tokenType != Tokens.X_VALUE || token.dataType.typeCode != Types.SQL_CHAR) {
break;
}
String s = token.tokenString;
read();
Object date = scanner.newDate(s);
return new ExpressionValue(date, Type.SQL_DATE);
}
case Tokens.TIME:
{
read();
if (token.tokenType != Tokens.X_VALUE || token.dataType.typeCode != Types.SQL_CHAR) {
break;
}
String s = token.tokenString;
read();
TimeData value = scanner.newTime(s);
Type dataType = scanner.dateTimeType;
return new ExpressionValue(value, dataType);
}
case Tokens.TIMESTAMP:
{
read();
if (token.tokenType != Tokens.X_VALUE || token.dataType.typeCode != Types.SQL_CHAR) {
break;
}
String s = token.tokenString;
read();
Object date = scanner.newTimestamp(s);
Type dataType = scanner.dateTimeType;
return new ExpressionValue(date, dataType);
}
case Tokens.INTERVAL:
{
boolean minus = false;
read();
if (token.tokenType == Tokens.MINUS) {
read();
minus = true;
} else if (token.tokenType == Tokens.PLUS) {
read();
}
if (token.tokenType != Tokens.X_VALUE || token.dataType.typeCode != Types.SQL_CHAR) {
break;
}
String s = token.tokenString;
read();
IntervalType dataType = readIntervalType();
Object interval = scanner.newInterval(s, dataType);
dataType = (IntervalType) scanner.dateTimeType;
if (minus) {
interval = dataType.negate(interval);
}
return new ExpressionValue(interval, dataType);
}
default:
throw Error.runtimeError(ErrorCode.U_S0500, "Parser");
}
rewind(pos);
return null;
}
