/*
 * @(#)BidirectionalBubbleSortAlgorithm.java   1.6f 95/01/31 James Gosling
 *
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/** A bi-directional bubble sort demonstration algorithm. <br />
 *  <br />
 *  SortAlgorithm.java, Thu Oct 27 10:32:35 1994<br />
 *  <br />
 *  Author:  James Gosling; his Version 1.6f, 31 Jan 1995<br />
 *  Modif. 15.11.2005, Albrecht Weinert (a-weinert.de) :<br />
 *  {@link SortApplet.SortAlgorithm} + Kleinigkeiten.<br />  
 *  <br />
 *  @author   Albrecht Weinert
 *  @version  V.161, 28.05.2011
 */
public final class BidirectionalBubbleSortAlgorithm
                                         extends SortApplet.SortAlgorithm {
   @Override void sort(int[] a) {
      int j;
      int limit = a.length;
      int st = -1;
      while (st < limit) {
         boolean flipped = false;
         st++;
         limit--;
         for (j = st; j < limit; ++j) {
            if (stopRequested)  return;  // Abbruch
            if (a[j] > a[j + 1]) {
               int T = a[j];
               a[j] = a[j + 1];
               a[j + 1] = T;
               flipped = true;
               pause(st, limit);
            }
         }
         if (!flipped)  return; // fertig
         for (j = limit; --j >= st;) {
            if (stopRequested) return; // Abbruch
            if (a[j] > a[j + 1]) {
               int T = a[j];
               a[j] = a[j + 1];
               a[j + 1] = T;
               flipped = true;
               pause(st, limit);
            }
         } // for
         if (!flipped)  return; // fertig
      } // while
      pause(st, limit);
   } // sort(int[]
   
} // class BidirectionalBubbleSortAlgorithm (15.11., 27.11.2005 A.W.)