1 /*
2  * Copyright (C) 2024 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.volume.panel.shared.model
18 
19 import kotlinx.coroutines.flow.Flow
20 import kotlinx.coroutines.flow.map
21 import kotlinx.coroutines.flow.mapNotNull
22 
23 /** Models a loadable result */
24 sealed interface Result<T> {
25 
26     /** The data is still loading */
27     class Loading<T> : Result<T>
28 
29     /** The data is loaded successfully */
30     data class Data<T>(val data: T) : Result<T>
31 }
32 
33 /** Wraps flow into [Result]. */
<lambda>null34 fun <T> Flow<T>.wrapInResult(): Flow<Result<T>> = map { Result.Data(it) }
35 
36 /** Filters only [Result.Data] from the flow. */
<lambda>null37 fun <T> Flow<Result<T>>.filterData(): Flow<T> = mapNotNull { it as? Result.Data<T> }.map { it.data }
38