/// <summary>
/// Perform the action
/// </summary>
/// <param name="action">the given action</param>
/// <returns>the returned action (or null)</returns>
public CompoundTerm DoAction(CompoundTerm action)
{
switch (action.FunctionSymbol.ToString())
{
case "Insert":
{
Coin coin = GetCoin(action.Arguments[0]);
EmptyCoffeeMachineImpl.InsertACoin(coin);
return(null);
}
case "Cancel":
{
Term coin = CompoundValue.GetTerm(EmptyCoffeeMachineImpl.Cancel());
return(new CompoundTerm(Symbol.Parse("Return"), coin));
}
default:
throw new InvalidOperationException("Unrecognized action: " + action.ToString());
}
}