1 /*
2  * Copyright (C) 2023 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.domain
18 
19 import com.android.systemui.volume.panel.dagger.scope.VolumePanelScope
20 import javax.inject.Inject
21 import kotlinx.coroutines.flow.Flow
22 import kotlinx.coroutines.flow.flowOf
23 
24 interface ComponentAvailabilityCriteria {
25 
26     /**
27      * Checks if the controller is currently available. Can be used to filter out unwanted
28      * components. For example, hide components for the hardware that is temporarily unavailable.
29      */
isAvailablenull30     fun isAvailable(): Flow<Boolean>
31 }
32 
33 @VolumePanelScope
34 class AlwaysAvailableCriteria @Inject constructor() : ComponentAvailabilityCriteria {
35 
36     override fun isAvailable(): Flow<Boolean> = flowOf(true)
37 }
38