small change

src/uebung07/quantities/plain/Length.java

@@ -1,46 +0,0 @@
-package uebung07.quantities.plain;
-
-import static uebung07.quantities.plain.LengthUnit.METER;
-import static uebung07.quantities.plain.TimeUnit.SECOND;
-import static uebung07.quantities.plain.VelocityUnit.METER_PER_SECOND;
-
-public class Length extends Quantity {
-    private final LengthUnit unit;
-
-    public Length(double value, LengthUnit unit) {
-        super(value, unit);
-        this.unit = unit;
-    }
-
-    public Length plus(Length other) {
-        return new Length(value + other.getBaseValue() / unit.baseFactor, unit);
-    }
-
-    public Length minus(Length other) {
-        return new Length(value - other.getBaseValue() / unit.baseFactor, unit);
-    }
-
-    public Length mult(double f) {
-        return new Length(value * f, unit);
-    }
-
-    public Length div(double f) {
-        return new Length(value / f, unit);
-    }
-
-    public Length to(LengthUnit unit) {
-        return new Length(getBaseValue() / unit.baseFactor, unit);
-    }
-
-    public double div(Length other) {
-        return getBaseValue() / other.getBaseValue();
-    }
-
-    public Velocity div(Time t) {
-        return new Velocity(this.value(METER) / t.value(SECOND), METER_PER_SECOND);
-    }
-
-    public Time div(Velocity v) {
-        return new Time(this.value(METER) / v.value(METER_PER_SECOND), SECOND);
-    }
-}

src/uebung07/quantities/plain/LengthUnit.java

@@ -1,14 +0,0 @@
-package uebung07.quantities.plain;
-
-public class LengthUnit extends Unit {
-    public LengthUnit(String name, double baseFactor) {
-        super(name, baseFactor);
-    }
-
-    public static final LengthUnit METER = new LengthUnit("m", 1);
-    public static final LengthUnit MILLIMETER = new LengthUnit("mm", 0.001);
-    public static final LengthUnit KILOMETER = new LengthUnit("km", 1000);
-    public static final LengthUnit MILE = new LengthUnit("mi", 1609.344);
-    public static final LengthUnit LIGHTYEAR = new LengthUnit("ly", 9460730472580800.0);
-    public static final LengthUnit PARSEC = new LengthUnit("pc", 3.0856776e16);
-}

src/uebung07/quantities/plain/PlainQuantitiesDemo.java

@@ -1,60 +0,0 @@
-package uebung07.quantities.plain;
-
-import static uebung07.quantities.plain.LengthUnit.KILOMETER;
-import static uebung07.quantities.plain.LengthUnit.MILE;
-import static uebung07.quantities.plain.LengthUnit.MILLIMETER;
-import static uebung07.quantities.plain.LengthUnit.PARSEC;
-import static uebung07.quantities.plain.TimeUnit.HOUR;
-import static uebung07.quantities.plain.TimeUnit.MINUTE;
-import static uebung07.quantities.plain.TimeUnit.SECOND;
-import static uebung07.quantities.plain.VelocityUnit.KMH;
-import static uebung07.quantities.plain.VelocityUnit.METER_PER_SECOND;
-import static uebung07.quantities.plain.VelocityUnit.MPH;
-
-public class PlainQuantitiesDemo {
-    public static void main(String[] args) {
-        final Length l1 = new Length(1, KILOMETER);
-        final Length l2 = new Length(1200, MILLIMETER);
-        final Length l3 = new Length(1, MILE);
-
-        System.out.println(l1);
-        System.out.println(l2);
-        System.out.println(l1 + " + " + l2 + " = " + l1.plus(l2));
-        System.out.println(l1 + " + " + l2 + " (in mm) = " + l1.plus(l2).to(MILLIMETER));
-
-        System.out.println(l3 + " / " + l1 + " = " + l3.div(l1));
-
-        final Time t1 = new Time(100, SECOND);
-        final Time t2 = new Time(5, HOUR);
-
-        System.out.println(t1);
-        System.out.println(t2);
-        System.out.println(t1.plus(t2));
-        System.out.println(t1.plus(t2).to(MINUTE));
-
-        final Velocity v1 = new Velocity(12, KMH);
-        final Velocity v2 = new Velocity(100, METER_PER_SECOND);
-
-        System.out.println(v1);
-        System.out.println(v2);
-        System.out.println(v2.to(KMH));
-        System.out.println(v1.plus(v2));
-
-        final Length l4 = new Length(300, KILOMETER).to(PARSEC);
-        final Time t3 = new Time(2, HOUR);
-        final Velocity v3 = l4.div(t3);
-        System.out.println(l4 + " / " + l3 + " = " + v3);
-
-        System.out.println(v1 + " * " + t1 + " = " + v1.mult(t1).to(KILOMETER));
-
-        final Length l5 = v3.mult(t1.to(HOUR));
-        System.out.println(v3 + " * " + t1 + " = " + l5);
-
-        final Time t5 = l4.div(v2);
-        System.out.println(l4 + " / " + v2 + " = " + t5.to(MINUTE));
-
-        Velocity v5 = new Velocity(55, MPH);
-        System.out.println(v5 + " = " + v5.format("%4.1f %s", KMH));
-        System.out.println((v5.mult(new Time(30, MINUTE)).to(MILE)));
-    }
-}

src/uebung07/quantities/plain/Quantity.java

@@ -1,28 +0,0 @@
-package uebung07.quantities.plain;
-
-public abstract class Quantity {
-    public final double value;
-    public final Unit unit;
-
-    protected Quantity(double value, Unit unit) {
-        this.value = value;
-        this.unit = unit;
-    }
-
-    public double getBaseValue() {
-        return value * unit.baseFactor;
-    }
-
-    public double value(Unit unit) {
-        return getBaseValue() / unit.baseFactor;
-    }
-
-    @Override
-    public String toString() {
-        return value + " " + unit;
-    }
-
-    public String format(String fmt, Unit unit) {
-        return String.format(fmt, value(unit), unit);
-    }
-}

src/uebung07/quantities/plain/Time.java

@@ -1,41 +0,0 @@
-package uebung07.quantities.plain;
-
-import static uebung07.quantities.plain.LengthUnit.METER;
-
-public class Time extends Quantity{
-    private final TimeUnit unit;
-
-    public Time(double value, TimeUnit unit) {
-        super(value, unit);
-        this.unit = unit;
-    }
-
-    public Time plus(Time other) {
-        return new Time( value + other.getBaseValue() / unit.baseFactor, unit);
-    }
-
-    public Time minus(Time other) {
-        return new Time( value - other.getBaseValue() / unit.baseFactor, unit);
-    }
-
-    public Time mult(double f) {
-        return new Time( value * f, unit);
-    }
-
-    public Time div(double f) {
-        return new Time( value / f, unit);
-    }
-
-    public Time to(TimeUnit unit) {
-        return new Time(getBaseValue() / unit.baseFactor, unit)
-    }
-
-    public double div(Time other) {
-        return getBaseValue() / other.getBaseValue();
-    }
-
-    public Length mult(Velocity v) {
-        return new Length(this.value(METER), METER);
-    }
-
-}

src/uebung07/quantities/plain/Unit.java

@@ -1,16 +0,0 @@
-package uebung07.quantities.plain;
-
-public abstract class Unit {
-    public final String name;
-    public final double baseFactor;
-
-    public Unit(String name, double baseFactor) {
-        this.name = name;
-        this.baseFactor = baseFactor;
-    }
-
-    @Override
-    public String toString() {
-        return name;
-    }
-}

src/uebung10/logo/BlackForest.java

@@ -0,0 +1,11 @@
+package uebung10.logo;
+
+public class BlackForest implements DarkForest{
+
+    @Override
+    public void breadCrumb(double x, double y) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'breadCrumb'");
+    }
+
+}

src/uebung10/logo/DarkForest.java

@@ -1,4 +1,4 @@
-package logo;
+package uebung10.logo;
 
 public interface DarkForest {
     void breadCrumb(double x, double y);

src/uebung10/logo/Demo.java

@@ -1,4 +1,4 @@
-package logo;
+package uebung10.logo;
 
 public class Demo {
     public static void main(String[] args) {

src/uebung10/logo/Go.java

@@ -0,0 +1,18 @@
+package uebung10.logo;
+
+public class Go implements Stmt{
+
+    public final double dist;
+
+    public Go(double dist) {
+        if (dist < 0) {
+            throw new IllegalArgumentException();
+        }
+        this.dist = dist;
+    }
+
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
+        return visitor.visit(this);
+    }
+}

src/uebung10/logo/HanselGretelFrame.java

@@ -1,4 +1,4 @@
-package logo;
+package uebung10.logo;
 
 import javax.swing.JFrame;
 import javax.swing.JPanel;

src/uebung10/logo/HanselGretelTest.java

@@ -0,0 +1,30 @@
+package uebung10.logo;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Before;
+
+public class HanselGretelTest {
+
+    public static final double EPS = 1e-10;
+    public static final Stmt PROG = new Sequence(new PenDown(), new Go(50),
+        new Turn(120), new Go(50),
+        new Turn(120), new Go(50));
+    
+    private Turtle turtle;
+
+    @Before
+    public void setup() {
+        turtle = new Turtle(2, 1, 0);
+    }
+
+    @Test
+    public void TestTriangle() {
+        final Visitor<Void> visitor = new HanselGretelVisitor(10, turtle, new BlackForest()); //final ist egal
+        PROG.accept(visitor);
+        assertEquals(2, turtle.getX(), EPS);
+        assertEquals(1, turtle.getY(), EPS);
+    }
+
+}

src/uebung10/logo/HanselGretelVisitor.java

@@ -0,0 +1,131 @@
+package uebung10.logo;
+
+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;
+        this.turtle = 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 void breadCrumb() {
+        forest.breadCrumb(turtle.getX(), turtle.getY());
+    }
+
+    private void layTrail(double d) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'layTrail'");
+    }
+
+    private abstract class State {
+        abstract void go(double dist);
+        abstract void up();
+        abstract void down();
+        }
+
+    private final State longUpState = new State(){
+
+        @Override
+        void go(double d) {turtle.go(d);}
+
+        @Override
+        void down(){
+            breadCrumb();
+            state = downState;
+        }
+
+        @Override
+        void up() {}
+
+    };
+
+    private final State downState = new State(){
+
+        @Override
+        void go(double d){
+            layTrail(d);
+        }
+
+        @Override
+        void up(){state = shortUpState;}
+
+        @Override
+        void down() {}
+    };
+
+    private final State shortUpState = new  State() {
+
+        @Override
+        void go(double dist) {
+            turtle.go(dist);
+            gap = gap + dist;
+
+            if (gap < s) {
+
+            } else {
+                gap = 0;
+                state = longUpState;
+            }
+        }
+
+        @Override
+        void up() {}
+
+        @Override
+        void down() {
+            state = downState;
+        }
+
+    };
+
+
+    private void go(double d) {
+        state.go(d);
+    }
+
+    private void down() {
+        state.down();
+    }
+
+    private void up() {
+        state.up();
+    }
+}

src/uebung10/logo/PenDown.java

@@ -0,0 +1,9 @@
+package uebung10.logo;
+
+public class PenDown implements Stmt{
+    
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
+        return visitor.visit(this);
+    }
+}

src/uebung10/logo/PenUp.java

@@ -0,0 +1,9 @@
+package uebung10.logo;
+
+public class PenUp implements Stmt {
+
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
+        return visitor.visit(this);
+    }
+}

src/uebung10/logo/Sequence.java

@@ -0,0 +1,15 @@
+package uebung10.logo;
+
+public class Sequence implements Stmt {
+
+    public final Stmt[] seq;
+
+    public Sequence(Stmt... seq) {
+        this.seq = seq.clone();
+    }
+
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
+        return visitor.visit(this);
+    }
+}

src/uebung10/logo/Stmt.java

@@ -0,0 +1,7 @@
+package uebung10.logo;
+
+public interface Stmt {
+
+    public <T> T accept(Visitor<T> visitor);
+
+}

src/uebung10/logo/Turn.java

@@ -0,0 +1,15 @@
+package uebung10.logo;
+
+public class Turn implements Stmt{
+
+    public final double angle;
+
+    public Turn(double angle) {
+        this.angle = angle;
+    }
+
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
+        return visitor.visit(this);
+    }
+}

src/uebung10/logo/Turtle.java

@@ -1,4 +1,4 @@
-package logo;
+package uebung10.logo;
 
 public class Turtle {
     private double x;

src/uebung10/logo/Visitor.java

@@ -0,0 +1,11 @@
+package uebung10.logo;
+
+public interface Visitor<T> {
+
+    T visit(PenUp penUp);
+    T visit(PenDown penDown);
+    T visit(Turn turn);
+    T visit(Sequence sequence);
+    T visit(Go go);
+
+}