Joda DateTime重叠和过滤

Question

I have two Intervals say,

// for simplicity, I present here only the hours
val interval1 = (08, 20)
val interval2 = (00, 10)

Now, when I do a overlap between the two intervals, I get

val overlap = interval.overlap(interval2) // gives me (08, 10)

Is there a method in joda-time that I can use to get the non overlapping time periods? I need to get (10, 20)

I tried using the gap method:

scala> val a = new Interval(DateTime.parse("2000-10-12T00:00:00"), DateTime.parse("2000-10-12T20:00:00"))

scala> val b = new Interval(DateTime.parse("2000-09-12T00:00:00"), DateTime.parse("2000-10-12T12:00:00"))

a.gap(b) // returns null
b.gap(a) // returns null

Answer 1

Looks like there is nothing in the library that offers this. So I came up with my own implementation which is like this:

  private def splitIntervals(interval1: Interval, interval2: Interval) = {
    Option(interval1.overlap(interval2)) match {
      case Some(overlap) => {
        if (overlap.equals(interval1)) Seq(interval1)
        else if (overlap.equals(interval2))
          Seq(overlap) :+
            new Interval(interval1.getStart, overlap.getStart) :+
            new Interval(overlap.getEnd, interval1.getEnd)
        else if (overlap.getStart.equals(interval1.getStart))
          Seq(overlap) :+
            new Interval(overlap.getEnd, interval1.getEnd)  
        else Seq(overlap) :+
          new Interval(interval1.getStart, overlap.getEnd)
      }
      case _ => Seq(interval1)
    }
  }

It covers all the possible edge cases!