@Override
	public Object evaluate(Message message) throws JMSException
    {
        Number value = operand.evaluateNumeric(message);
        if (value == null)
            return null;
        
        return ArithmeticUtils.minus(value);
    }
@ Override public Object evaluate ( Message message ) throws JMSException { Number value = operand . evaluateNumeric ( message ) ; if ( value == null ) return null ; return ArithmeticUtils . minus ( value ) ; }
/*
(non-Javadoc)
@see net.timewalker.ffmq4.common.message.selector.expression.SelectorNode#evaluate(javax.jms.Message)