code: @Override
  	public Object evaluate(Message message) throws JMSException
      {
      	Object leftValue = leftOperand.evaluate(message);
      	Object rightValue = rightOperand.evaluate(message);
      	if (leftValue == null || rightValue == null)
              return null;
      	
      	int leftType = getNodeType(leftValue);
          int rightType = getNodeType(rightValue);
          if (leftType != SelectorNodeType.NUMBER ||
              rightType != SelectorNodeType.NUMBER)
          {
          	return Boolean.FALSE; // [JMS Spec]
          }
          
          return ArithmeticUtils.greaterThanOrEquals((Number)leftValue, (Number)rightValue);
      }
docs: /*
  (non-Javadoc)
  @see net.timewalker.ffmq4.common.message.selector.expression.SelectorNode#evaluate(javax.jms.Message)