Ich hasse Minas

src/uebung10/logo/Go.java

@@ -7,9 +7,8 @@ public class Go implements Stmt{
     public Go(double dist) {
         if (dist < 0) {
             throw new IllegalArgumentException();
-        } else {
-            this.dist = dist;
         }
+        this.dist = dist;
     }
 
     @Override

src/uebung10/logo/HanselGretelVisitor.java

@@ -1,11 +1,12 @@
 package uebung10.logo;
 
-public class HanselGretelVisitor implements Visitor<Turtle> {
+public class HanselGretelVisitor implements Visitor<Void> {
 
     private double gap;
     private double s;
     private Turtle turtle;
     private DarkForest forest;
+    private State state;
 
     public HanselGretelVisitor(double s, Turtle turtle, DarkForest forest) {
         this.s = s;
@@ -13,6 +14,76 @@ public class HanselGretelVisitor implements Visitor<Turtle> {
         this.forest = forest;
     }
 
-    
+    @Override
+    public Void visit(PenUp penUp) {
+        up();
+        return null;
+    }
 
+    @Override
+    public Void visit(PenDown penDown) {
+        down();
+        return null;
+    }
+
+    @Override
+    public Void visit(Turn turn) {
+        turtle.turn(turn.angle);
+        return null;
+    }
+
+    @Override
+    public Void visit(Sequence sequence) {
+        for(Stmt elem :sequence.seq) {
+            elem.accept(this);
+        }
+        return null;
+    }
+
+    @Override
+    public Void visit(Go go) {
+        go(go.dist);
+        return null;
+    }
+
+    private abstract class State {
+        abstract void go(double dist);
+        void up() {}
+        void down() {}
+        }
+
+    private final State shortUp = new ShortUpState();// muss nicht geschrieben werden
+    private final State down = new DownState();// muss nicht geschrieben werden
+    private final State longUp = new LongUpSate();
+
+    private class LongUpSate extends State{
+        void go(double d) {}
+        void up(){}
+        void down(){}
+    }
+
+    private class DownState extends State{
+        void go(double d){}
+        void up(){}
+        void down(){}
+    }
+
+    private class ShortUpState extends State {
+        void go(double d){}
+        void up(){}
+        void down(){}
+    }
+
+
+    private void go(double d) {
+        state.go(d);
+    }
+
+    private void down() {
+        state.down();
+    }
+
+    private void up() {
+        state.up();
+    }
 }

src/uebung10/logo/Sequence.java

@@ -5,7 +5,7 @@ public class Sequence implements Stmt {
     public final Stmt[] seq;
 
     public Sequence(Stmt... seq) {
-        this.seq = seq;
+        this.seq = seq.clone();
     }
 
     @Override