Processing.org state machine

state_machine.pde

interface State {
  public State nextState();
}

class IdleState implements State {
  public State nextState() {
    return new ScanState();
  }
}

class ScanState implements State {
  public State nextState() {
    return new LookupState();
  }
}

class LookupState implements State {
  public State nextState() {
    return new MessageState();
  }
}

class MessageState implements State {
  public State nextState() {
    return new PauseState();
  }
}

class PauseState implements State {
  private int start;
  private final int timeout = 5000; // 5 sec
  
  PauseState() {
    start = millis();
  }
  
  public State nextState() {
    if((millis()-start) < timeout) 
      return this;
      
    return new IdleState();
  }
}


State state;

void setup() {
  frameRate(1);
  
  state = new IdleState();
}


void draw() {
  
  println(state);
  state = state.nextState();
}