missing classes

Model.java

@@ -0,0 +1,31 @@
+package ui.model;
+
+import java.util.ArrayList;
+
+import ui.controller.*;
+
+public class Model {
+	private ArrayList<Category> Categories;
+	private ArrayList<HolonObject> ObjectsOnCanvas;
+	
+	public Model(){
+		Categories = new ArrayList<Category>();
+		ObjectsOnCanvas = new ArrayList<HolonObject>();
+	}
+	
+	public void addCategory(Category toAdd){
+		Categories.add(toAdd);
+	}
+	
+	public void deleteCategory(int idx){
+		Categories.remove(idx);
+	}
+	
+	public void addObject(HolonObject toAdd){
+		ObjectsOnCanvas.add(toAdd);
+	}
+	
+	public void deleteObject(int idx){
+		ObjectsOnCanvas.remove(idx);
+	}
+}

src/ui/controller/Category.java

@@ -0,0 +1,32 @@
+package ui.controller;
+
+import java.util.ArrayList;
+
+public class Category {
+	private ArrayList<HolonObject> objects;
+	private String name;
+	
+	public Category(String name){
+		this.name = name;
+	}
+	
+	public void addObject(HolonObject toAdd){
+		objects.add(toAdd);
+	}
+	
+	public void deleteObject(int idx){
+		objects.remove(idx);
+	}
+	
+	public ArrayList<HolonObject> getObjects(){
+		return objects;
+	}
+	
+	public void changeName(String name){
+		this.name = name;
+	}
+	
+	public String getName(){
+		return name;
+	}
+}

src/ui/controller/Position.java

@@ -0,0 +1,17 @@
+package ui.controller;
+
+public class Position {
+	public int x;
+	public int y;
+	
+	public Position(int x, int y){
+		this.x = x;
+		this.y = y;
+	}
+	
+	//default Constructor
+	public Position(){
+		this.x = -1;
+		this.y = -1;
+	}
+}