/**
* This method implements the unary minus operator for double.
*
* @param result The result of a previous call to this method, null if not called yet
* @return A SQLDecimal containing the result of the division
* @exception StandardException Thrown on error
*/
public NumberDataValue minus(NumberDataValue result) throws StandardException {
if (result == null) {
result = new SQLDecimal();
}
if (this.isNull()) {
result.setToNull();
return result;
}
result.setBigDecimal(getBigDecimal().negate());
return result;
}
/**
* This method implements the * operator for "double * double".
*
* @param left The first value to be multiplied
* @param right The second value to be multiplied
* @param result The result of a previous call to this method, null if not called yet
* @return A SQLDecimal containing the result of the multiplication
* @exception StandardException Thrown on error
*/
public NumberDataValue times(NumberDataValue left, NumberDataValue right, NumberDataValue result)
throws StandardException {
if (result == null) {
result = new SQLDecimal();
}
if (left.isNull() || right.isNull()) {
result.setToNull();
return result;
}
result.setBigDecimal(SQLDecimal.getBigDecimal(left).multiply(SQLDecimal.getBigDecimal(right)));
return result;
}
/**
* This method implements the + operator for DECIMAL.
*
* @param addend1 One of the addends
* @param addend2 The other addend
* @param result The result of a previous call to this method, null if not called yet
* @return A SQLDecimal containing the result of the addition
* @exception StandardException Thrown on error
*/
public NumberDataValue plus(
NumberDataValue addend1, NumberDataValue addend2, NumberDataValue result)
throws StandardException {
if (result == null) {
result = new SQLDecimal();
}
if (addend1.isNull() || addend2.isNull()) {
result.setToNull();
return result;
}
result.setBigDecimal(SQLDecimal.getBigDecimal(addend1).add(SQLDecimal.getBigDecimal(addend2)));
return result;
}
/**
* This method implements the / operator for BigDecimal/BigDecimal
*
* @param dividend The numerator
* @param divisor The denominator
* @param result The result of a previous call to this method, null if not called yet
* @param scale The result scale, if < 0, calculate the scale according to the actual values'
* sizes
* @return A SQLDecimal containing the result of the division
* @exception StandardException Thrown on error
*/
public NumberDataValue divide(
NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result, int scale)
throws StandardException {
if (result == null) {
result = new SQLDecimal();
}
if (dividend.isNull() || divisor.isNull()) {
result.setToNull();
return result;
}
BigDecimal divisorBigDecimal = SQLDecimal.getBigDecimal(divisor);
if (divisorBigDecimal.compareTo(ZERO) == 0) {
throw StandardException.newException(SQLState.LANG_DIVIDE_BY_ZERO);
}
BigDecimal dividendBigDecimal = SQLDecimal.getBigDecimal(dividend);
/*
** Set the result scale to be either the passed in scale, whcih was
** calculated at bind time to be max(ls+rp-rs+1, 4), where ls,rp,rs
** are static data types' sizes, which are predictable and stable
** (for the whole result set column, eg.); otherwise dynamically
** calculates the scale according to actual values. Beetle 3901
*/
result.setBigDecimal(
dividendBigDecimal.divide(
divisorBigDecimal,
scale > -1
? scale
: Math.max(
(dividendBigDecimal.scale() + SQLDecimal.getWholeDigits(divisorBigDecimal) + 1),
NumberDataValue.MIN_DECIMAL_DIVIDE_SCALE),
BigDecimal.ROUND_DOWN));
return result;
}
