1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.systemui.statusbar.notification.people
18 
19 object EmptySubscription : Subscription {
20     override fun unsubscribe() {}
21 }
22 
23 class FakeDataSource<T>(
24     private val data: T,
25     private val subscription: Subscription = EmptySubscription
26 ) : DataSource<T> {
27     override fun registerListener(listener: DataListener<T>): Subscription {
28         listener.onDataChanged(data)
29         return subscription
30     }
31 }