public void listenToDocumentLocal()

in firestore/app/src/main/java/com/google/example/firestore/DocSnippets.java [694:717]

20 lines of code
6 McCabe index (conditional complexity)


    public void listenToDocumentLocal() {
        // [START listen_document_local]
        final DocumentReference docRef = db.collection("cities").document("SF");
        docRef.addSnapshotListener(new EventListener<DocumentSnapshot>() {
            @Override
            public void onEvent(@Nullable DocumentSnapshot snapshot,
                                @Nullable FirebaseFirestoreException e) {
                if (e != null) {
                    Log.w(TAG, "Listen failed.", e);
                    return;
                }

                String source = snapshot != null && snapshot.getMetadata().hasPendingWrites()
                        ? "Local" : "Server";

                if (snapshot != null && snapshot.exists()) {
                    Log.d(TAG, source + " data: " + snapshot.getData());
                } else {
                    Log.d(TAG, source + " data: null");
                }
            }
        });
        // [END listen_document_local]
    }