Handle on cancelled (#282)

Author: SUPERCILEX

database/src/main/java/com/firebase/ui/database/FirebaseArray.java

@@ -28,6 +28,7 @@ class FirebaseArray implements ChildEventListener {
     public interface OnChangedListener {
         enum EventType { Added, Changed, Removed, Moved }
         void onChanged(EventType type, int index, int oldIndex);
+        void onCancelled(DatabaseError databaseError);
     }
 
     private Query mQuery;
@@ -94,20 +95,28 @@ public void onChildMoved(DataSnapshot snapshot, String previousChildKey) {
         notifyChangedListeners(OnChangedListener.EventType.Moved, newIndex, oldIndex);
     }
 
-    public void onCancelled(DatabaseError firebaseError) {
-        // TODO: what do we do with this?
+    public void onCancelled(DatabaseError databaseError) {
+        notifyCancelledListeners(databaseError);
     }
     // End of ChildEventListener methods
 
     public void setOnChangedListener(OnChangedListener listener) {
         mListener = listener;
     }
+    
     protected void notifyChangedListeners(OnChangedListener.EventType type, int index) {
         notifyChangedListeners(type, index, -1);
     }
+    
     protected void notifyChangedListeners(OnChangedListener.EventType type, int index, int oldIndex) {
         if (mListener != null) {
             mListener.onChanged(type, index, oldIndex);
         }
     }
+    
+    protected void notifyCancelledListeners(DatabaseError databaseError) {
+        if (mListener != null) {
+            mListener.onCancelled(databaseError);
+        }
+    }
 }

database/src/main/java/com/firebase/ui/database/FirebaseListAdapter.java

@@ -15,11 +15,13 @@
 package com.firebase.ui.database;
 
 import android.app.Activity;
+import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 
 import com.google.firebase.database.DatabaseReference;
+import com.google.firebase.database.DatabaseError;
 import com.google.firebase.database.DataSnapshot;
 import com.google.firebase.database.Query;
 
@@ -73,6 +75,11 @@ public FirebaseListAdapter(Activity activity, Class<T> modelClass, int modelLayo
             public void onChanged(EventType type, int index, int oldIndex) {
                 notifyDataSetChanged();
             }
+
+            @Override
+            public void onCancelled(DatabaseError databaseError) {
+                FirebaseListAdapter.this.onCancelled(databaseError);
+            }
         });
     }
     /**
@@ -133,6 +140,16 @@ public View getView(int position, View view, ViewGroup viewGroup) {
         populateView(view, model, position);
         return view;
     }
+    
+    /**
+     * This method will be triggered in the event that this listener either failed at the server,
+     * or is removed as a result of the security and Firebase Database rules.
+     *
+     * @param databaseError A description of the error that occurred
+     */
+    protected void onCancelled(DatabaseError databaseError) {
+        Log.w("FirebaseRecyclerAdapter", databaseError.toException());
+    }
 
     /**
      * Each time the data at the given Firebase location changes, this method will be called for each item that needs
@@ -146,5 +163,4 @@ public View getView(int position, View view, ViewGroup viewGroup) {
      * @param position  The position in the list of the view being populated
      */
     abstract protected void populateView(View v, T model, int position);
-
 }

database/src/main/java/com/firebase/ui/database/FirebaseRecyclerAdapter.java

@@ -15,11 +15,13 @@
 package com.firebase.ui.database;
 
 import android.support.v7.widget.RecyclerView;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
 import com.google.firebase.database.DataSnapshot;
+import com.google.firebase.database.DatabaseError;
 import com.google.firebase.database.DatabaseReference;
 import com.google.firebase.database.Query;
 
@@ -108,6 +110,11 @@ public void onChanged(EventType type, int index, int oldIndex) {
                         throw new IllegalStateException("Incomplete case statement");
                 }
             }
+            
+            @Override
+            public void onCancelled(DatabaseError databaseError) {
+                FirebaseRecyclerAdapter.this.onCancelled(databaseError);
+            }
         });
     }
 
@@ -181,6 +188,16 @@ public void onBindViewHolder(VH viewHolder, int position) {
     public int getItemViewType(int position) {
         return mModelLayout;
     }
+    
+    /**
+     * This method will be triggered in the event that this listener either failed at the server,
+     * or is removed as a result of the security and Firebase Database rules.
+     *
+     * @param databaseError A description of the error that occurred
+     */
+    protected void onCancelled(DatabaseError databaseError) {
+        Log.w("FirebaseRecyclerAdapter", databaseError.toException());
+    }
 
     /**
      * Each time the data at the given Firebase location changes, this method will be called for each item that needs