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Author: UprightPath (posted 2012-06-14 01:28:05, viewed 213 times)

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public class SemiRandomIteratorObject {
   private static Random random = new Random();
   private int startIndex;
   private int rangeStart;
   private int rangeEnd;
   private int range;
   private int currIndex;
   private int currLoopIndex;
   private int totalIterations;
   private int step;
   private boolean up;
   private boolean move;
   private List<?> collection;

   public SemiRandomIteratorObject(List<?> collection, int range, int rangeStart, int step) {
      this.collection = collection;
      this.range = range;
      this.rangeStart = rangeStart;
      this.rangeEnd = this.rangeStart + range;
      this.startIndex = this.rangeStart + random.nextInt(range);
      this.currIndex = startIndex;
      this.currLoopIndex = this.currIndex;
      this.step = step;
      this.up = random.nextBoolean();
      this.move = random.nextBoolean();
   }

   public boolean hasNext() {
      return totalIterations < range;
   }

   public Object getNext() {
      Object o = collection.get(currIndex);
      if (up) {
         currIndex += step;
         if (currIndex >= rangeEnd) {
            currIndex = rangeStart + (currIndex - rangeEnd);
         }
      } else {
         currIndex -= step;
         if (currIndex < rangeStart) {
            currIndex = rangeEnd - (rangeStart - currIndex);
         }
      }
      if (currLoopIndex == currIndex) {
         currIndex += move ? 1 : -1;
         if (currIndex >= rangeEnd) {
            currIndex = rangeStart + (currIndex - rangeEnd);
         } else if (currIndex < rangeStart) {
            currIndex = rangeEnd - (rangeStart - currIndex);
         }
         currLoopIndex = currIndex;
      }
      totalIterations++;
      return o;
   }
}





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