Correctly handle long tracks and trains

src/edu/kit/informatik/MainTest.java

@@ -73,6 +73,11 @@ class MainTest {
         cmpInOut("fuzz8_input.txt", "fuzz8_output.txt");
     }
 
+    @Test
+    void fuzz9() throws IOException {
+        cmpInOut("fuzz9_input.txt", "fuzz9_output.txt");
+    }
+
     @Test
     void fuzz10() throws IOException {
         cmpInOut("fuzz10_input.txt", "fuzz10_output.txt");

src/edu/kit/informatik/model/ModelRailwaySimulation.java

@@ -2,6 +2,7 @@ package edu.kit.informatik.model;
 
 import edu.kit.informatik.ui.CoachType;
 import edu.kit.informatik.Terminal;
+import edu.kit.informatik.ui.InvalidInputException;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -365,8 +366,10 @@ public class ModelRailwaySimulation {
      * @param position where to place the train
      * @param direction direction in which the train should initially go
      * @return whether the train was successfully placed
+     * @throws InvalidInputException when the train is too long
      */
-    public boolean putTrain(final int trainId, final Vector2D position, final Vector2D direction) {
+    public boolean putTrain(final int trainId, final Vector2D position, final Vector2D direction)
+            throws InvalidInputException {
         Train train = trains.get(trainId);
         if (train == null || !train.isProperTrain() || train.isPlaced()) {
             // can only place valid trains that are not already placed

src/edu/kit/informatik/model/Track.java

@@ -41,7 +41,7 @@ public final class Track extends Rail {
     @Override
     public boolean canConnectToRail(Rail rail) {
         if (rail == null) {
-            System.out.println("hey");
+            System.out.println("hey"); // TODO: remove
         }
         return rail.canConnectTo(start) || rail.canConnectTo(end);
     }
@@ -59,25 +59,28 @@ public final class Track extends Rail {
     @Override
     public boolean contains(Vector2D position) {
         if (start.getX() == end.getX() && position.getX() == start.getX()) {
-            int dy0 = Math.abs(start.getY() - end.getY());
+            int startY = start.getY();
-            int dy1 = Math.abs(start.getY() - position.getY());
+            int endY = end.getY();
-            int dy2 = Math.abs(end.getY() - position.getY());
+            int positionY = position.getY();
-            return dy1 > 0 && dy2 > 0 && dy1 < dy0 && dy2 < dy0;
+            return (startY < positionY && positionY < endY) || (startY > positionY && positionY > endY);
         } else if (start.getY() == end.getY() && position.getY() == start.getY()) {
-            int dx0 = Math.abs(start.getX() - end.getX());
+            int startX = start.getX();
-            int dx1 = Math.abs(start.getX() - position.getX());
+            int endX = end.getX();
-            int dx2 = Math.abs(end.getX() - position.getX());
+            int positionX = position.getX();
-            return dx1 > 0 && dx2 > 0 && dx1 < dx0 && dx2 < dx0;
+            return (startX < positionX && positionX < endX) || (startX > positionX && positionX > endX);
         }
         return false;
     }
 
     @Override
     public Vector2D getDirectionFrom(Vector2D position) {
+        // have to use long arithmetic here to avoid overflows
         if (start.equals(position)) {
-            return new Vector2D(end.getX() - start.getX(), end.getY() - start.getY()).normalized();
+            return new Vector2D(Long.signum((long) end.getX() - (long) start.getX()),
+                    Long.signum((long) end.getY() - (long) start.getY()));
         } else if (end.equals(position)) {
-            return new Vector2D(start.getX() - end.getX(), start.getY() - end.getY()).normalized();
+            return new Vector2D(Long.signum((long) start.getX() - (long) end.getX()),
+                    Long.signum((long) start.getY() - (long) end.getY()));
         } else {
             throw new IllegalArgumentException();
         }

src/edu/kit/informatik/model/Train.java

@@ -1,6 +1,7 @@
 package edu.kit.informatik.model;
 
 import edu.kit.informatik.Terminal;
+import edu.kit.informatik.ui.InvalidInputException;
 
 import java.util.ArrayList;
 import java.util.HashSet;
@@ -136,10 +137,16 @@ public final class Train {
      * @param position where to place the train
      * @param rawDirection direction in which the train should initially go
      * @return whether the train was successfully placed
+     * @throws InvalidInputException when the train is too long to place
      */
-    public boolean placeOn(final RailwayNetwork railNetwork, final Vector2D position, final Vector2D rawDirection) {
+    public boolean placeOn(final RailwayNetwork railNetwork, final Vector2D position, final Vector2D rawDirection)
+            throws InvalidInputException {
         Vector2D direction = rawDirection.normalized();
-        int length = getLength();
+        long length = getLength();
+        if (length > Integer.MAX_VALUE) {
+            // we can not create a position list this long! TODO: await forum answer
+            throw new InvalidInputException("train length is bigger than 32-bit integer!");
+        }
 
         LinkedList<Vector2D> positions = new LinkedList<>();
         positions.add(position);
@@ -148,6 +155,8 @@ public final class Train {
         if (length > 10000) {
             return false; // TODO: remove!
         }
+        // TODO check that the requested direction is equal to the direction of one the tracks
+        // consider fuzz 9 (0,-1)
         for (int i = 1; i <= length; i++) {
             rollingStockPosition = railNetwork.move(rollingStockPosition, positioningDirection);
             if (rollingStockPosition == null
@@ -375,7 +384,7 @@ public final class Train {
      * Calculate the length of this train, summing the length of all rolling stocks.
      * @return total length of this train
      */
-    public int getLength() {
+    public long getLength() {
-        return rollingStocks.stream().mapToInt((RollingStock::getLength)).sum();
+        return rollingStocks.stream().mapToLong((RollingStock::getLength)).sum();
     }
 }

src/edu/kit/informatik/model/Vector2D.java

@@ -58,8 +58,8 @@ public class Vector2D {
      * @param other the point to measure distance to
      * @return the manhattan distance
      */
-    public int distanceTo(final Vector2D other) {
+    public long distanceTo(final Vector2D other) {
-        return Math.abs(this.x - other.x) + Math.abs(this.y - other.y);
+        return Math.abs((long) this.x - (long) other.x) + Math.abs((long) this.y - (long) other.y);
     }
 
     /**

src/edu/kit/informatik/ui/CommandLine.java

@@ -37,25 +37,12 @@ public class CommandLine {
                 break;
             }
 
-            final Command command;
-            try {
-                command = CommandFactory.getCommand(input);
-            } catch (NumberFormatException e) {
-                Terminal.printError("number too big");
-                continue;
-            } catch (InvalidInputException e) {
-                Terminal.printError(e.getMessage());
-                continue;
-            }
-            if (command != null) {
             try {
+                Command command = CommandFactory.getCommand(input);
                 command.apply(simulation);
-                } catch (NumberFormatException e) {
+            } catch (NumberFormatException | InvalidInputException e) {
-                    Terminal.printError("number too big");
+                Terminal.printError(e.getMessage());
-                    // this can happen when trying to add W2147483649 to a train or similar
+            }
-                }
-            }
-            // else: error message already printed in parse function
         }
     }
 }

src/edu/kit/informatik/ui/command/Command.java

@@ -1,6 +1,7 @@
 package edu.kit.informatik.ui.command;
 
 import edu.kit.informatik.model.ModelRailwaySimulation;
+import edu.kit.informatik.ui.InvalidInputException;
 
 /**
  * Command that can be applied to a simulation.
@@ -13,6 +14,7 @@ public abstract class Command {
     /**
      * Apply this command to a model railway simulation.
      * @param simulation simulation to use
+     * @throws InvalidInputException on invalid user input
      */
-    public abstract void apply(ModelRailwaySimulation simulation);
+    public abstract void apply(ModelRailwaySimulation simulation) throws InvalidInputException;
 }

src/edu/kit/informatik/ui/command/PutTrain.java

@@ -3,6 +3,7 @@ package edu.kit.informatik.ui.command;
 import edu.kit.informatik.model.ModelRailwaySimulation;
 import edu.kit.informatik.model.Vector2D;
 import edu.kit.informatik.Terminal;
+import edu.kit.informatik.ui.InvalidInputException;
 
 /**
  * Command used to put a train on the rail network.
@@ -31,7 +32,7 @@ public class PutTrain extends Command {
     }
 
     @Override
-    public void apply(final ModelRailwaySimulation simulation) {
+    public void apply(final ModelRailwaySimulation simulation) throws InvalidInputException {
         if (simulation.putTrain(id, point, new Vector2D(x, y))) {
             Terminal.printLine("OK");
         } else {