Add Conveyor belts and only accept items when data is ´null`

The conveyor belts work, but they are also kind of broken at the moment. Have fun!

src/main/java/com/yes/yes/behaviours/ItemBehaviour.java

@@ -23,7 +23,7 @@ public class ItemBehaviour extends Component {
         System.out.println("Running item update");
         Platform.runLater(() -> {
             this.itemGroup.getChildren().clear();
-            this.itemGroup.getChildren().add(this.parent.getData(dataKey));
+            this.itemGroup.getChildren().add(item);
         });
         System.out.println("Finished item update");
     }

src/main/java/com/yes/yes/behaviours/RecieveBehaviour.java

@@ -41,8 +41,8 @@ public class RecieveBehaviour extends Component {
     }
 
     void receive(Item item) {
-        if (offerer == null)
+        if (offerer == null) return;
-            return;
+        if(this.parent.getData(dataKey) != null) return;
 
         this.parent.setData(dataKey, item);
         this.parent.trigger(dataKey + "Changed", item);

src/main/java/com/yes/yes/entities/machines/ConveyorBelt.java

@@ -0,0 +1,31 @@
+package com.yes.yes.entities.machines;
+
+import com.yes.yes.behaviours.*;
+import com.yes.yes.utils.BlockContainer;
+import com.yes.yes.utils.Direction;
+import com.yes.yes.utils.Entity;
+import javafx.scene.paint.Color;
+import javafx.scene.shape.Polygon;
+import javafx.scene.shape.Rectangle;
+
+public class ConveyorBelt extends Entity {
+    public ConveyorBelt() {
+        super();
+        Polygon t = new Polygon();
+        t.getPoints().addAll(
+                25.0,0.0,
+                0.0,50.0,
+                50.0,50.0);
+        t.setFill(new Color(0,0,0,1));
+
+        this.getChildren().addAll(t);
+    }
+
+    public ConveyorBelt(BlockContainer blockContainer) {
+        this();
+        this.addBehaviour(new PlaceBehaviour(this, blockContainer));
+        this.addBehaviour(new ItemBehaviour(this, blockContainer,"Item"));
+        this.addBehaviour(new RecieveBehaviour(this, blockContainer, Direction.DOWN, "Item"));
+        this.addBehaviour(new OfferBehaviour(this, blockContainer, Direction.UP, "Item"));
+    }
+}

src/main/java/com/yes/yes/managers/GameManager.java

@@ -1,5 +1,6 @@
 package com.yes.yes.managers;
 
+import com.yes.yes.entities.machines.ConveyorBelt;
 import com.yes.yes.entities.machines.GeneratorMachine;
 import com.yes.yes.entities.machines.TestMachine;
 import com.yes.yes.entities.machines.TestMachine2;
@@ -36,6 +37,7 @@ public class GameManager {
             EntityRegistry.register(new RegistryEntry("test", "test receive machine", TestMachine.class));
             EntityRegistry.register(new RegistryEntry("test2", "test offer machine", TestMachine2.class));
             EntityRegistry.register(new RegistryEntry("generator", "generator", GeneratorMachine.class));
+            EntityRegistry.register(new RegistryEntry("conveyorBelt", "Conveyor Belt", ConveyorBelt.class));
         } catch (AlreadyExistsException e) {
             e.printStackTrace();
         }

src/main/java/com/yes/yes/managers/PlayerManager.java

@@ -58,7 +58,7 @@ public class PlayerManager {
 
             Entity entity = (Entity) registryEntry.getEntity().getConstructor(types).newInstance(blockContainer);
             world.getChunk(chunkCoordinate).setEntity(entity, blockCoordinate);
-            entity.setRotation(random.nextInt(0,4));
+            //entity.setRotation(random.nextInt(0,4));
             entity.initialize();
         } catch (Exception ex) {
             ex.printStackTrace();