/*
* Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
/**
* Sort: a class that uses the quicksort algorithm to sort an
* array of objects.
*
* @author Sunita Mani
*/
package sun.misc;
public class Sort {
private static void swap(Object arr[], int i, int j) {
Object tmp;
tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
/**
* quicksort the array of objects.
*
* @param arr[] - an array of objects
* @param left - the start index - from where to begin sorting
* @param right - the last index.
* @param comp - an object that implemnts the Compare interface to resolve thecomparison.
*/
public static void quicksort(Object arr[], int left, int right, Compare comp) {
int i, last;
if (left >= right) { /* do nothing if array contains fewer than two */
return; /* two elements */
}
swap(arr, left, (left+right) / 2);
last = left;
for (i = left+1; i <= right; i++) {
if (comp.doCompare(arr[i], arr[left]) < 0) {
swap(arr, ++last, i);
}
}
swap(arr, left, last);
quicksort(arr, left, last-1, comp);
quicksort(arr, last+1, right, comp);
}
public static void quicksort(Object arr[], Compare comp) {
quicksort(arr, 0, arr.length-1, comp);
}
}