/*
 * @(#)BidirectionalBubbleSortAlgorithm.java	1.6f 95/01/31 James Gosling
 *
 * Copyright (c) 1994-1995 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL or COMMERCIAL purposes and
 * without fee is hereby granted. 
 * Please refer to the file http://java.sun.com/copy_trademarks.html
 * for further important copyright and trademark information and to
 * http://java.sun.com/licensing.html for further important licensing
 * information for the Java (tm) Technology.
 * 
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 * 
 * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
 * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
 * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
 * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
 * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
 * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
 * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES").  SUN
 * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
 * HIGH RISK ACTIVITIES.
 */

/**
 * A bi-directional bubble sort demonstration algorithm
 * SortAlgorithm.java, Thu Oct 27 10:32:35 1994
 *
 * @author James Gosling
 * @version 	1.6f, 31 Jan 1995
 */
class CocktailSortAlgorithm extends SortAlgorithm {
  void sort(int a[]) throws Exception {
    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;
	}
	if (a[j] > a[j + 1]) {
	  int T = a[j];
	  a[j] = a[j + 1];
	  a[j + 1] = T;
	  flipped = true;
	}
	compex(j,j+1);
	pause(st, limit);
      }
      if (!flipped) {
	return;
      }
      for (j = limit; --j >= st;) {
	if (stopRequested) {
	  return;
	}
	if (a[j] > a[j + 1]) {
	  int T = a[j];
	  a[j] = a[j + 1];
	  a[j + 1] = T;
	  flipped = true;
	}
	compex(j, j+1);
	pause(st, limit);
      }
      if (!flipped) {
	return;
      }
    }
    pause(st, limit);
  }
}