public Object value()

in velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTIntegerRange.java [213:282]
35 lines of code
10 McCabe index (conditional complexity)

    public Object value(InternalContextAdapter context)
        throws MethodInvocationException
    {
        /*
         *  get the two range ends
         */

        Object left = jjtGetChild(0).value( context );
        Object right = jjtGetChild(1).value( context );

        /*
         *  if either is null, lets log and bail
         */

        if (left == null || right == null)
        {
            log.error((left == null ? "Left" : "Right")
                           + " side of range operator [n..m] has null value."
                           + " Operation not possible. "
                           + StringUtils.formatFileString(this));
            return null;
        }

        /*
         *  if not a Number, try to convert
         */

        try
        {
            left = DuckType.asNumber(left);
        }
        catch (NumberFormatException nfe) {}

        try
        {
            right = DuckType.asNumber(right);
        }
        catch (NumberFormatException nfe) {}

        /*
         *  if still not a Number, nothing we can do
         */

        if ( !( left instanceof Number )  || !( right instanceof Number ))
        {
            log.error((!(left instanceof Number) ? "Left" : "Right")
                           + " side of range operator is not convertible to a Number. "
                           + StringUtils.formatFileString(this));
            return null;
        }

        /*
         *  get the two integer values of the ends of the range
         */

        int l = ((Number) left).intValue() ;
        int r = ((Number) right).intValue();

        /*
         *  Determine whether the increment is positive or negative.
         */

        int delta = ( l >= r ) ? -1 : 1;

        /*
         * Return the corresponding integer range
         */

        return new IntegerRange(l, r, delta);
    }