/*
 * Tuple class
 * Tyler Robison
 * 
 * This class is primarily an example using generics.
 * Perhaps most importantly, it demonstrates how to allocate generic arrays.
 * 
 * It defines a 'Tuple' class that lets the user create a list of size n of type T, and get/set to those indices.
 * 
 */

public class Tuple<T>
{
	//the array in which we'll store our tuple data (and the length of the tuple)
	private T[] arr;
	
	//pass in the # of elements in the tuple
	public Tuple(int n)
	{
		//this statement causes a type-safety warning; don't worry about it
		//if it bothers you, you can 'suppress' this warning
		arr=(T[])new Object[n];
	}
	
	//returns the tuple item stored at index i, or throws an exception if that index is out of range 
	public T get(int i)
	{
		if(i<0 || i>=arr.length) throw new RuntimeException("Supplied index "+i+" is out of bounds for 'get'"); 
		return arr[i];
	}
	
	//stores the item at index i, or throws an exception if that index is out of range
	public void set(int i,T t)
	{
		if(i<0 || i>=arr.length) throw new RuntimeException("Supplied index "+i+" is out of bounds for 'set'");
		arr[i]=t;
	}
	
	//returns 'n'; the length of the tuple
	public int getN()
	{
		return arr.length;
	}
}