Pass identifier to viewmodel

Author: Daniel Novak

library/src/main/java/eu/inloop/viewmodel/AbstractViewModel.java

@@ -8,9 +8,25 @@
 
 public abstract class AbstractViewModel<T extends IView> {
 
+    @NonNull
+    private String mUniqueIdentifier;
+
     @Nullable
     private T mView;
 
+    void setUniqueIdentifier(String uniqueIdentifier) {
+        mUniqueIdentifier = uniqueIdentifier;
+    }
+
+    /**
+     *
+     * @return An app unique identifier for the current viewmodel instance (will be kept during orientation
+     * change). This identifier will be reset in case the corresponding activity is killed.
+     */
+    public String getUniqueIdentifier() {
+        return mUniqueIdentifier;
+    }
+
     public void initWithView(@NonNull T view) {
         mView = view;
     }

library/src/main/java/eu/inloop/viewmodel/ViewModelProvider.java

@@ -49,6 +49,7 @@ public synchronized <T extends IView> ViewModelWrapper<T> getViewModel(@NonNull
 
         try {
             instance = viewModelClass.newInstance();
+            instance.setUniqueIdentifier(key);
             mViewModelCache.put(key, instance);
             return new ViewModelWrapper<>(instance, true);
         } catch (InstantiationException | IllegalAccessException e) {