Java Hour getDelayToNextHour(int amount, boolean skipNext)

Description

This method could be named better, Here is what it does If you want to schedule a task every 2 hours, it is easier to track it if it happens at 2 am, 4 am, 6 am, 8 am ....

License

Open Source License

Parameter

Parameter	Description
amount	a parameter

Declaration

public static long getDelayToNextHour(int amount, boolean skipNext) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.Calendar;

public class Main {
    /**//w  ww  .j  a v  a 2s  . c  o m
     * This method could be named better, Here is what it does
     * If you want to schedule a task every 2 hours, it is easier
     * to track it if it happens at 2 am, 4 am, 6 am, 8 am .... 
     * rather than 2 hours from the time it is triggered 
     *  
     *  If you want to skip the first run to make sure there is 
     *  a minimum delay of "amount" hours, set skipNext to true
     * 
     * @param amount
     * @return
     */
    public static long getDelayToNextHour(int amount, boolean skipNext) {
        if (amount <= 0 || amount > 12) {
            throw new IllegalArgumentException("The amount must be between 1 and 12 and be a divisor of 24");
        }
        Calendar c = Calendar.getInstance();
        long currentTime = c.getTimeInMillis();
        c.clear(Calendar.MINUTE);
        c.clear(Calendar.SECOND);
        c.clear(Calendar.MILLISECOND);

        int hour = c.get(Calendar.HOUR);
        int offset = amount - (hour % amount);
        if (skipNext) {
            offset += amount;
        }
        c.add(Calendar.HOUR, offset);
        return (c.getTimeInMillis() - currentTime);
    }
}

Related

1. getCurrentHour()
2. getCurrentHour()
3. getCurrentHours()
4. getCurrHour()
5. getDelay(int hour, int min)
6. getGMTHour(int localHour)
7. getHexString(byte[] raw)
8. getHour()
9. getHour()