Remake Vehicle classes

- Abstract class CivilVehicle that implements Breakable and
	contains all common fields of vehicles. Now for example,
	Sedan <- CivilVehicle <- Vehicle
		      ^
		  Breakable
	The breakable methods are mostly implemented in CivilVehicle
	Except getTimeToFix() which is defined in subclasses of
	CivilVehicle.

	- Breakable interface:
	The method collide() now returns instance of Accident instead of
	void

Signed-off-by: HeshamTB <hishaminv@gmail.com>

src/Breakable.java

@@ -5,7 +5,7 @@ public interface Breakable {
     int getTimeToFix();
     boolean isBroken();
     boolean isInAccident();
-    void collide(Breakable car, Date time);
+    Accident collide(Breakable car, Date time);
     void _break(Date time);
     void fix();
 

src/Bus.java

@@ -1,11 +1,8 @@
 import java.util.Date;
 
-public class Bus extends Vehicle implements Breakable {
+public class Bus extends CivilVehicle {
 
     private final int TIME_TO_FIX = 20; //in minutes
-    private boolean broken;
-    private boolean inAccident;
-    private Date breakDownTime;//TODO: PDate
 
     public Bus(double vehicleSize) {
         super(vehicleSize);
@@ -15,32 +12,4 @@ public class Bus extends Vehicle implements Breakable {
     public int getTimeToFix() {
         return TIME_TO_FIX;
     }
-
-    @Override
-    public boolean isBroken() {
-        return broken;
-    }
-
-    @Override
-    public boolean isInAccident() {
-        return inAccident;
-    }
-
-    @Override
-    public void collide(Breakable car, Date time) {
-        //Make Accident here and change return type?
-        // or make reference as property
-    }
-
-    @Override
-    public void _break(Date time) {
-        broken = true;
-        breakDownTime = time;
-    }
-
-    @Override
-    public void fix() {
-        broken = false;
-        inAccident = false;
-    }
 }

src/CivilVehicle.java

@@ -0,0 +1,58 @@
+import java.util.Date;
+
+public abstract class  CivilVehicle extends Vehicle implements Breakable {
+
+    private boolean broken;
+    private boolean inAccident;
+    private Accident currentAccident;
+    private Date breakDownTime;
+
+    public CivilVehicle(double vehicleSize) {
+        super(vehicleSize);
+    }
+
+    @Override
+    public boolean isBroken() {
+        return broken;
+    }
+
+    @Override
+    public boolean isInAccident() {
+        return inAccident;
+    }
+
+    @Override
+    public Accident collide(Breakable car, Date time) {
+        if (currentAccident == null) {
+            Breakable[] cars = new Breakable[2];
+            cars[0] = this;
+            cars[1] = car;
+            Accident accident = new Accident(time, cars);
+            this.currentAccident = accident;
+            this.inAccident = true;
+            return accident;
+        }
+        return null;
+    }
+
+    @Override
+    public void _break(Date time) {
+        broken = true;
+        breakDownTime = time;
+    }
+
+    @Override
+    public void fix() {
+        broken = false;
+        inAccident = false;
+        breakDownTime = null;
+    }
+
+    public Accident getCurrentAccident() {
+        return currentAccident;
+    }
+
+    public Date getBreakDownTime() {
+        return breakDownTime;
+    }
+}

src/Sedan.java

@@ -1,31 +1,14 @@
 import java.util.Date;
 
-public class Sedan extends Vehicle implements Breakable {
+public class Sedan extends CivilVehicle {
 
     private final int TIME_TO_FIX = 15; //in minutes
-    private boolean broken;
-    private boolean accident;
 
     public Sedan(double vehicleSize){
         super(vehicleSize);
     }
 
-    public boolean isBroken(){ return broken; }
-    public boolean isInAccident(){ return accident; }
-
-    @Override
-    public void collide(Breakable car, Date time) {
-
-    }
-
-    @Override
-    public void _break(Date time) {
-
-    }
-
     public int getTimeToFix(){ return TIME_TO_FIX; }
 
 
-    public void fix() { this.broken = false; this.accident = false; }
-
 }