code: package org.omnetpp.common.eventlog;
  
  import org.omnetpp.common.collections.IEnumerator;
  import org.omnetpp.common.collections.RangeSet;
  
  public class EventNumberRangeSet extends RangeSet<Long> {
      private static class EventNumberEnumerator implements IEnumerator<Long> {
          @Override
          public int compare(Long o1, Long o2) {
              return (int)(o1 - o2);
          }
  
          @Override
          public Long getPrevious(Long value) {
              return value - 1;
          }
  
          @Override
          public Long getNext(Long value) {
              return value + 1;
          }
  
          @Override
          public int getApproximateDelta(Long o1, Long o2) {
              return (int)(o2 - o1);
          }
  
          @Override
          public boolean isExact() {
              return true;
          }
      };
  
      public EventNumberRangeSet() {
          super(new EventNumberEnumerator());
      }
  }
  