getting user defined messages using antlr3.0.1

Question

numberrange returns [String value]
    :   numberrangesub
        {
        String numberRange = ($numberrangesub.text);
        String [] v = numberRange.split(",");
        if ( Integer.parseInt(v[0].trim()) < Integer.parseInt(v[1].trim())) $value =numberRange;
        else throw new RecognitionException();
        }
    ;

Please observe the above ANTLR code. In this I want to throw a user friendly error message like "from value should be less than to value in BETWEEN clause". I am expecting like this RecognitionException("from value should be less than to value in BETWEEN clause"); But antlr did not accept like as above.

In java class where I am calling the generated java class by Antlr. I am handling like as follows.

try
{
    parser.numberRangeCheck();
}
catch (RecognitionException e)
{
    throw createException("Invalid Business logic syntax at  " + parser.getErrorHeader(e) + ", " + parser.getErrorMessage(e, null), Level.INFO, logger);
}

Any help will be appriciated.

Answer 1

Why not simply throw a RuntimeException with your custom error message?

// ...
else throw new RuntimeException("from value should be less than to value in BETWEEN clause");
// ...