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Author: UprightPath (posted 2012-07-27 00:26:28, viewed 180 times)

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// The State Machine's context.
import java.util.ArrayList;

public class TurnStateContext {
   private ArrayList<TurnState> critters = new ArrayList<TurnState>();

   public TurnStateContext() {

   }

   public void addState(TurnState state) {
      if (critters.isEmpty()) {
         state.enterState();
      }
      critters.add(state);
   }

   public void performAction() {
      if (!critters.isEmpty()) {
         critters.get(0).performAction();
         if (critters.get(0).hasPerformedAction()) {
            critters.get(0).exitState();
            critters.add(critters.get(0));
            critters.remove(0);
            critters.get(0).enterState();
         }
      } else {
         System.out.println("Nothing to perform an action on, oh-no!");
      }
   }

   public static void main(String[] args) {
      TurnStateContext context = new TurnStateContext();
      context.addState(new PlayerTurnState(context));
      context.addState(new MobTurnState(context, "Mob 1"));
      context.addState(new MobTurnState(context, "Mob 2"));
      for (int i = 0; i < 100; i++) {
         context.performAction();
      }
   }
}

// The abstract class for the states.

public abstract class TurnState {
   protected TurnStateContext context;
   protected boolean performedAction;

   public TurnState(TurnStateContext context) {
      this.context = context;
   }

   public void enterState() {
      performedAction = false;
      enterStateImplement();
   }

   protected abstract void enterStateImplement();

   public void exitState() {
      exitStateImplement();
   }

   protected abstract void exitStateImplement();

   public abstract void performAction();

   public boolean hasPerformedAction() {
      return performedAction;
   }
}

// Player's state

public class PlayerTurnState extends TurnState {

   public PlayerTurnState(TurnStateContext context) {
      super(context);
   }

   @Override
   protected void enterStateImplement() {
      // TODO Auto-generated method stub

   }

   @Override
   protected void exitStateImplement() {
      // TODO Auto-generated method stub

   }

   @Override
   public void performAction() {
      System.out.println("This is where the player takes input!");
      this.performedAction = true;
   }

}

// A generic Mob

public class MobTurnState extends TurnState {
   private String name;

   public MobTurnState(TurnStateContext context, String name) {
      super(context);
      this.name = name;
      // TODO Auto-generated constructor stub
   }

   @Override
   protected void enterStateImplement() {
      // TODO Auto-generated method stub

   }

   @Override
   protected void exitStateImplement() {
      // TODO Auto-generated method stub

   }

   @Override
   public void performAction() {
      System.out.println("This is where " + name + " is deciding what to do!");
      this.performedAction = true;
   }

}





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