package username.sorting;

import java.util.Random;

/**
 * Utilities for playing with vectors of Integers.
 */
public class IVUtils
{
    /**
     * Build a "random" sorted vector of a specified size.
     */
    static Vector<Integer> sortedVector(int size)
    {
        Random r = new Random();
        Vector<Integer> vec = new Vector<Integer>(size);
        vec.setSize(size);
        int val = r.nextInt(3);
        for (int i = 0; i < size; i++) {
            vec.set(i, new Integer(val));
            val = val + r.nextInt(3);
        }
        return vec;
    } // sortedVector(int)

    /**
     * Permute a vector.
     */
    static void permute(Vector<Integer> vec)
    {
        Random r = new Random();
        int size = vec.size();
        for (int i = 0; i < size; i++) {
            int swap = r.nextInt(size);
            Integer tmp = vec.get(i);
            vec.set(i, vec.get(swap));
            vec.set(swap, tmp);
        }
    } // permute(Vector<Integer>)

    /**
     * Clone a vector.
     */
    static Vector<Integer> clone(Vector<Integer> vec)
    {
        int size = vec.size();
        Vector<Integer> dolly = new Vector<Integer>(size);
        dolly.setSize(size);
        for (int i = 0; i < size; i++) {
            dolly.set(i, vec.get(i));
        } // for
        return dolly;
    } // clone(Vector<Integer>)

} // IVUtils