Android Open Source - NXTControl Array Sorter

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License

The source code is released under:

GNU General Public License

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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
///*  w ww.j a  va 2  s.  co m*/
// Copyright (c) 2013, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.bandtec.nxtcontrol.util;

public class ArraySorter {
  public static interface Comparer<E> {
    public int compare(E a, E b);
  }
  
  private ArraySorter() {
  }
  
  public static <E> void sort(E[] elements, int i, int n, Comparer<E> comparer) {
    if (n > 1) {
      final int m = n >> 1, endB = i + n;
      sort(elements, i, m, comparer);
      sort(elements, i + m, n - m, comparer);
      int iB = i + m;
      E eA = elements[i];
      E eB = elements[iB];
      for (;;) {
        if (comparer.compare(eA, eB) > 0) {
          System.arraycopy(elements, i, elements, i + 1, iB - i);
          elements[i] = eB;
          if ((++iB) >= endB || (++i) >= iB) break; //MUST INCREMENT iB BEFORE COMPARING i AND iB
          eB = elements[iB];
        } else {
          if ((++i) >= iB) break;
          eA = elements[i];
        }
      }
    }
  }
}

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