Transform: implement equals and hashCode

jme3-core/src/main/java/com/jme3/math/Transform.java

@@ -288,6 +288,29 @@ public final class Transform implements Savable, Cloneable, java.io.Serializable
         rot.set(0, 0, 0, 1);
     }
 
+    @Override
+    public int hashCode() {
+        int hash = 7;
+        hash = 89 * hash + rot.hashCode();
+        hash = 89 * hash + translation.hashCode();
+        hash = 89 * hash + scale.hashCode();
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final Transform other = (Transform) obj;
+        return this.translation.equals(other.translation)
+                && this.scale.equals(other.scale)
+                && this.rot.equals(other.rot);
+    }
+
     @Override
     public String toString(){
         return getClass().getSimpleName() + "[ " + translation.x + ", " + translation.y + ", " + translation.z + "]\n"
@@ -307,22 +330,21 @@ public final class Transform implements Savable, Cloneable, java.io.Serializable
         return this;
     }
 
+    @Override
     public void write(JmeExporter e) throws IOException {
         OutputCapsule capsule = e.getCapsule(this);
-        capsule.write(rot, "rot", new Quaternion());
+        capsule.write(rot, "rot", Quaternion.IDENTITY);
         capsule.write(translation, "translation", Vector3f.ZERO);
         capsule.write(scale, "scale", Vector3f.UNIT_XYZ);
     }
 
+    @Override
     public void read(JmeImporter e) throws IOException {
         InputCapsule capsule = e.getCapsule(this);
         
-        rot = (Quaternion)capsule.readSavable("rot", new Quaternion());        
-        translation = (Vector3f)capsule.readSavable("translation", null);
-        if( translation == null ) {
-            translation = new Vector3f();
-        }
-        scale = (Vector3f)capsule.readSavable("scale", Vector3f.UNIT_XYZ);
+        rot.set((Quaternion)capsule.readSavable("rot", Quaternion.IDENTITY));
+        translation.set((Vector3f)capsule.readSavable("translation", Vector3f.ZERO));
+        scale.set((Vector3f)capsule.readSavable("scale", Vector3f.UNIT_XYZ));
     }
     
     @Override