@@ -0,0 +1,832 @@
+/*%0A * Copyright 2019 Google LLC%0A *%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A *     https://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0Apackage com.google.android.gnd.rx;%0A%0A/**%0A * Singleton value used for use as value in Rx streams where presence of value indicates some%0A * event, but there's no meaningful value to emit (e.g., button clicks).%0A */%0Apublic enum Nil %7B%0A  NIL%0A%7D%0A

Add Nil placeholder for streams