/*
* 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;
	}
}