public Object value()

in velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTMathNode.java [86:137]
41 lines of code
11 McCabe index (conditional complexity)

    public Object value(InternalContextAdapter context) throws MethodInvocationException
    {
        Object left = jjtGetChild(0).value(context);
        Object right = jjtGetChild(1).value(context);

        /*
         * should we do anything special here?
         */
        Object special = handleSpecial(left, right, context);
        if (special != null)
        {
            return special;
        }

        // coerce to Number type, if possible
        try
        {
            left = DuckType.asNumber(left);
        }
        catch (NumberFormatException nfe) {}
        try
        {
            right = DuckType.asNumber(right);
        }
        catch (NumberFormatException nfe) {}

        /*
         * if not a Number, not much we can do
         */
        if (!(left instanceof Number) || !(right instanceof Number))
        {
            boolean wrongright = (left instanceof Number);
            boolean wrongtype = wrongright ? right != null : left != null;
            String msg = (wrongright ? "Right" : "Left")
                        + " side of math operation ("
                        + jjtGetChild(wrongright ? 1 : 0).literal() + ") "
                        + (wrongtype ? "is not a Number. " : "has a null value. ")
                        + getLocation(context);
            if (strictMode)
            {
                log.error(msg);
                throw new MathException(msg, rsvc.getLogContext().getStackTrace());
            }
            else
            {
                log.debug(msg);
                return null;
            }
        }

        return perform((Number)left, (Number)right, context);
    }