package candy;

import java.lang.reflect.Constructor;

/**
 * A candy machine that has the capacity of N basic candy machines.
 * by a base machine.
 *
 * @author CSC223 2004F
 * @version 0.0 of August 2004
 */
public class BiggerCandyMachine0
	implements CandyMachine
{

// +--------+------------------------------------------------------------
// | Fields |
// +--------+

	int machinesLeft = 5;
	CandyMachine base;

// +--------------+------------------------------------------------------
// | Constructors |
// +--------------+

	public BiggerCandyMachine0(CandyMachine _base) {
		this.base = _base;  // Thanks Jesse!
	} // BiggerCandyMachine0(CandyMachine)

// +----------+----------------------------------------------------------
// | Mutators |
// +----------+

	public String get()
		throws CandyMachineException
	{
		// Build a new machine, if necessary
		if (this.base.isEmpty() && this.machinesLeft > 0) {
			this.base = this.newMachine();
			--this.machinesLeft;
		}
		return base.get();
	} // get()

// +-----------+---------------------------------------------------------
// | Observers |
// +-----------+

	public boolean isEmpty()
	{
		// For the bigger machine to be empty, we need
		// no other machines left and the base machine to
		// be empty.
		return (this.machinesLeft == 0) && this.base.isEmpty();
	} // isEmpty()

// +-------+-------------------------------------------------------------
// | Local |
// +-------+

	private CandyMachine newMachine()
		throws CandyMachineException
	{
		try {
			Class baseClass = base.getClass();
			Constructor cons = baseClass.getConstructor(null);
			return (CandyMachine) cons.newInstance(null);
		}
		catch (Exception e) {
			throw new CandyMachineException(e.toString()); // Hack!
		}
	} // newMachine()

} // class BiggerCandyMachine0