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Author: UprightPath (posted 2012-06-16 11:27:09, viewed 246 times)

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import java.util.List;
import java.util.Random;

public class SemiRandomIteratorDirectionalUprightPath implements RandomIterator {
   private static int[] primes = new int[] { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
         157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367,
         373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541 };
   private int startIndex;
   private int rangeStart;
   private int rangeEnd;
   private int currIndex;
   private int currLoopIndex;
   private int step;
   private boolean up;
   private boolean move;
   private final List<Integer> collection;
   private final Random random;
   private final long seed;
   private final int collectionSize;

   public SemiRandomIteratorDirectionalUprightPath(List<Integer> collection, Random random, long seed) {
      this.collection = collection;
      this.random = random;
      this.seed = seed;
      this.collectionSize = collection.size();
      this.rangeStart = 0;
      int range = collection.size();
      this.rangeEnd = this.rangeStart + range;
      this.startIndex = this.rangeStart + random.nextInt(range);
      this.currIndex = startIndex;
      this.currLoopIndex = this.currIndex;
      this.step = getStep(range);
      this.up = random.nextBoolean();
      this.move = random.nextBoolean();
   }

   public SemiRandomIteratorDirectionalUprightPath(int collectionSize, Random random, long seed) {
      this.collection = null;
      this.random = random;
      this.seed = seed;
      this.collectionSize = collectionSize;
      this.rangeStart = 0;

      int range = collectionSize;
      this.rangeEnd = this.rangeStart + range;
      this.startIndex = this.rangeStart + random.nextInt(range);
      this.currIndex = startIndex;
      this.currLoopIndex = this.currIndex;
      this.step = getStep(range);
      this.up = random.nextBoolean();
      this.move = random.nextBoolean();
   }

   public static int getStep(int range) {
      for (int i = 99; i >= 0; i--) {
         if (range > primes[i]) {
            if (range % primes[i] == 0) {
               return primes[i];
            }
         }
      }
      return 1;
   }

   public Integer getNext() {
      if (currIndex >= collectionSize) {
         calculateNextIndex();
         return getNext();
      }

      Integer o = collection.get(currIndex);
      calculateNextIndex();
      return o;
   }

   private void calculateNextIndex() {
      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;
      }

   }

   public int getNextIndex() {

      if (currIndex >= collectionSize) {
         calculateNextIndex();
         return getNextIndex();
      }

      int returnIndex = currIndex;
      calculateNextIndex();
      return returnIndex;
   }

   public String getStatus() {
      return "no status";
   }

   public String getName() {
      return "Directional by UprightPath";
   }
}





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