arlut.csd.Util
Class VecQuickSort

java.lang.Object
  |
  +--arlut.csd.Util.VecQuickSort

All Implemented Interfaces:

Compare

public class VecQuickSort

extends java.lang.Object

implements Compare

QuickSort implementation for Vector. Uses the Compare interface for item comparisons.

Based on code by Eric van Bezooijen (eric@logrus.berkeley.edu) and Roedy Green (roedy@bix.com).

Field Summary

(package private) arlut.csd.Util.Compare	comparator
(package private) java.util.Vector	objects

Constructor Summary

VecQuickSort(java.util.Vector objects, arlut.csd.Util.Compare comparator)
VecQuickSort constructor.

Method Summary

int	compare(java.lang.Object a, java.lang.Object b) Default comparator, does a string comparison on the toString() output of the objects for ordering.
private int	partition(int first, int last) Partition by splitting this chunk to sort in two and get all big elements on one side of the pivot and all the small elements on the other.
private void	quick(int first, int last)
void	sort() Sort the elements
private void	swap(int i, int j)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

objects

java.util.Vector objects

comparator

arlut.csd.Util.Compare comparator

Constructor Detail

VecQuickSort

public VecQuickSort(java.util.Vector objects,
                    arlut.csd.Util.Compare comparator)

VecQuickSort constructor.

Parameters:

objects - Vector of objects to be sorted in place

comparator - Compare object.. if null, standard string compare will be done.

Method Detail

quick

private void quick(int first,
                   int last)

partition

private int partition(int first,
                      int last)

Partition by splitting this chunk to sort in two and get all big elements on one side of the pivot and all the small elements on the other.

swap

private void swap(int i,
                  int j)

sort

public void sort()

Sort the elements

compare

public int compare(java.lang.Object a,
                   java.lang.Object b)

Default comparator, does a string comparison on the toString() output of the objects for ordering.

Specified by:

compare in interface Compare