package com.ots.project.monitor.job.util;
import org.quartz.CronExpression;
import java.text.ParseException;
import java.util.Date;

public class CronUtils {
    
    public static boolean isValid(String cronExpression) {
        return CronExpression.isValidExpression(cronExpression);
    }
    
    public static String getInvalidMessage(String cronExpression) {
        try {
            new CronExpression(cronExpression);
            return null;
        } catch (ParseException pe) {
            return pe.getMessage();
        }
    }
    
    public static Date getNextExecution(String cronExpression) {
        try {
            CronExpression cron = new CronExpression(cronExpression);
            return cron.getNextValidTimeAfter(new Date(System.currentTimeMillis()));
        } catch (ParseException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }
}