Date: 10/06/05 (Code WTF)    Keywords: no keywords

    /** 
     * What schedule am I on? 
     * 
     * I know this is kinda ugly!  If you can think of a cleaner way 
     * to do this, please jump in! 
     * 
     * @return A number specifying the type of schedule. See 
     * calcRunTime(). 
     * @exception Exception, a generic exception. 
     */ 
    private int evaluateJobType() 
        throws Exception 
    { 
 
        // First start by checking if it's a day of the month job. 
        if ( day_of_month < 0 ) 
        { 
            // Not a day of the month job... check weekday. 
            if ( weekday < 0 ) 
            { 
                // Not a weekday job...check if by the hour. 
                if ( hour < 0 ) 
                { 
                    // Not an hourly job...check if it is by the minute 
                    if ( minute < 0 ) 
                    { 
                        // Not a by the minute job so must be by the second 
                        if ( second < 0) 
                            throw new Exception("Error in JobEntry. Bad Job parameter."); 
 
                        return SECOND; 
                    } 
                    else 
                    { 
                        // Must be a job run by the minute so we need minutes and 
                        // seconds. 
                        if ( minute < 0 || second < 0 ) 
                            throw new Exception("Error in JobEntry. Bad Job parameter."); 
 
                        return MINUTE; 
                    } 
                } 
                else 
                { 
                    // Must be a daily job by hours minutes, and seconds.  In 
                    // this case, we need the minute, second, and hour params. 
                    if ( minute < 0 || hour < 0 || second < 0) 
                        throw new Exception("Error in JobEntry. Bad Job parameter."); 
 
                    return DAILY; 
                } 
            } 
            else 
            { 
                // Must be a weekday job.  In this case, we need 
                // minute, second, and hour params 
                if ( minute < 0 || hour < 0 || second < 0 ) 
                    throw new Exception("Error in JobEntry. Bad Job parameter."); 
 
                return WEEK_DAY; 
            } 
        } 
        else 
        { 
            // Must be a day of the month job.  In this case, we need 
            // minute, second, and hour params 
            if ( minute < 0 || hour < 0 ) 
                throw new Exception("Error in JobEntry. Bad Job parameter."); 
 
            return DAY_OF_MONTH; 
        } 
    }

Source: http://www.livejournal.com/community/code_wtf/16294.html