public Object add()

in src/main/java/org/apache/commons/jexl3/JexlArithmetic.java [323:368]
40 lines of code
17 McCabe index (conditional complexity)

    public Object add(final Object left, final Object right) {
        if (left == null && right == null) {
            return controlNullNullOperands(JexlOperator.ADD);
        }
        final boolean strconcat = strict
                            ? left instanceof String || right instanceof String
                            : left instanceof String && right instanceof String;
        if (!strconcat) {
            try {
                final boolean strictCast = isStrict(JexlOperator.ADD);
                // if both (non-null) args fit as long
                final Number ln = asLongNumber(strictCast, left);
                final Number rn = asLongNumber(strictCast, right);
                if (ln != null && rn != null) {
                    final long x = ln.longValue();
                    final long y = rn.longValue();
                    final long result = x + y;
                    // detect overflow, see java8 Math.addExact
                    if (((x ^ result) & (y ^ result)) < 0) {
                        return BigInteger.valueOf(x).add(BigInteger.valueOf(y));
                    }
                    return narrowLong(left, right, result);
                }
                // if either are BigDecimal, use that type
                if (left instanceof BigDecimal || right instanceof BigDecimal) {
                    final BigDecimal l = toBigDecimal(strictCast, left);
                    final BigDecimal r = toBigDecimal(strictCast, right);
                    return l.add(r, getMathContext());
                }
                // if either are floating point (double or float), use double
                if (isFloatingPointNumber(left) || isFloatingPointNumber(right)) {
                    final double l = toDouble(strictCast, left);
                    final double r = toDouble(strictCast, right);
                    return l + r;
                }
                // otherwise treat as BigInteger
                final BigInteger l = toBigInteger(strictCast, left);
                final BigInteger r = toBigInteger(strictCast, right);
                final BigInteger result = l.add(r);
                return narrowBigInteger(left, right, result);
            } catch (final ArithmeticException nfe) {
                // ignore and continue in sequence
            }
        }
        return (left == null ? "" : toString(left)).concat(right == null ? "" : toString(right));
    }