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import java.util.Random;
abstract class CommonState implements StateLessStateMachine.MachineState
{
protected void say()
{
System.out.println(" # " + this.getClass().getName());
}
}
class StartState extends CommonState
{
public StateLessStateMachine.State process()
{
say();
System.out.println(" GO!");
return StateLessStateMachine.State.TRY;
}
}
class TryState extends CommonState
{
public StateLessStateMachine.State process()
{
StateLessStateMachine.State nextState = null;
say();
int i = (new Random()).nextInt(6);
switch (i) {
case 1:
System.out.println(" -> Success");
nextState = StateLessStateMachine.State.SUCCESS;
break;
default:
System.out.println(" -> Failure");
nextState = StateLessStateMachine.State.FAILURE;
break;
}
return nextState;
}
}
class FailureState extends CommonState
{
public StateLessStateMachine.State process()
{
say();
System.out.println(" -> Retry");
return StateLessStateMachine.State.TRY;
}
}
class SuccessState extends CommonState
{
public StateLessStateMachine.State process()
{
say();
System.out.println(" -> well done");
return StateLessStateMachine.State.STOP;
}
}
class StateLessStateMachine
{
public enum State
{
STOP(-1), START(0), TRY(1), SUCCESS(2), FAILURE(3);
public int i;
State(int i) { this.i = i; }
}
interface MachineState
{
public State process();
}
private MachineState[] states = {
new StartState(),
new TryState(),
new SuccessState(),
new FailureState()
};
public State process(State currentState)
{
if (currentState == State.STOP) return currentState;
return states[currentState.i].process();
}
}
public class StateLessStateMachineTest
{
public static void main(String [] args )
{
System.out.println(StateLessStateMachineTest.class.getName());
StateLessStateMachine stm = new StateLessStateMachine();
StateLessStateMachine.State st = StateLessStateMachine.State.START;
do {
st = stm.process(st);
} while (st != StateLessStateMachine.State.STOP);
}
}
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