package plp.sort;

import java.util.*;

public class SortableArray implements SortableData {
    private Object [] array;
    private Comparator comparator;

    public SortableArray(Comparable [] array) {
	this(array, null);
    }

    public SortableArray(Object [] array, Comparator comparator) {
	this.array = array;
	this.comparator = comparator;
    }

    public int length() {
	return array.length;
    }

    public void swap(int i, int j) {
	Object tmp = array[i];
	array[i] = array[j];
	array[j] = tmp;
    }

    public Object access(int i) {
	return array[i];
    }

    public int compare(int i, int j) {
	return (comparator == null 
		? ((Comparable) array[i]).compareTo(array[j])
		: comparator.compare(array[i], array[j]));
    }
}