Which is the best way to represent the business opening hours in a Java object?

Question

I need to represent opening hours, and a method which returns true/false for a certain day and time. Is there any package which has this functionality already?

Edit: Basically I would need to construct an object with data out of db or a file, then perform a basic check against the object, like if it's closed at a certain moment.

The problem was that some businesses will have working hours after 00:00 so it overlaps the next day. In this case I figure out that the object should be able to support multiple time frames per day, also to cover lunch brakes.

Answer 1

You can create a class by using Calendar and see if its working day and working hour now.

class BusinessHour{

public void isOpenNow(){
  Calendar calNow = Calendar.getInstance();
    //check the rules for example , if day is MOn-FRi and time is 9-18.
  }
}

I don't think there would be a ready made because each business has its own specification, You could probably make if configurable so that it fixes for all the business, provide the conf parameter externally to the class for better design

Answer 2

I use following Object to store OpeningHours in HashSet. Example bellow can be easily simplified using seconds from Midnight instead of "800" or "1600" for hours but I like it this way.

public class OpeningHours {
  public enum DAY {
    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
  }

public OpeningHours(DAY day, Integer from, Integer to) {
    this.day = day;
    this.from = from; // format time using 800 for 8:00am or 2300 for 23:00
    this.to = to;
}

@Override
public String toString() {
    return "OpeningHours [day=" + day + ", from=" + from + ", to=" + to + ", isAllDay=" + isAllDay + "]";
}

public OpeningHours() {

}

public DAY day;
public Integer from;
public Integer to;
public boolean isAllDay = false;

public void isOpenx(DateTime start) {

}

public boolean isOpen(DateTime start) {

    if (day.ordinal() != start.getDayOfWeek() - 1) {
        return false;
    }

    if (isAllDay)
        return true;

    String f = String.format("%04d", from);
    String t = String.format("%04d", to);

    Integer fh = Integer.valueOf(f.substring(0, 2));
    Integer fm = Integer.valueOf(f.substring(2));

    Integer th = Integer.valueOf(t.substring(0, 2));
    Integer tm = Integer.valueOf(t.substring(2));

    DateTime intStart = start.withHourOfDay(fh).withMinuteOfHour(fm);
    DateTime intEnd = start.withHourOfDay(th).withMinuteOfHour(tm);

    if (intStart.equals(start) || intEnd.equals(start)) {
        return true;
    }
    if (intStart.isBefore(start) && intEnd.isAfter(start)) {
        return true;
    }

    return false;

}
}

HashSet<OpeningHours> hours = new HashSet<OpeningHours>();
hours.add(new OpeningHours(OpeningHours.DAY.MONDAY, 800, 1200));
hours.add(new OpeningHours(OpeningHours.DAY.MONDAY, 1230, 1600));


DateTime dateToCheck = new DateTime(2012, 9, 4, 8, 00, 0, 0);

for (OpeningHours item : hours) {
  boolean isOpen = item.isOpen(dateToCheck );
  if (isOpen){
    System.out.println("Is Open!");
  }
}