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.car.customization.tool.domain.panel
18 
19 import javax.inject.Inject
20 import javax.inject.Provider
21 
22 /**
23  * The Controller for all the possible panels in the tool.
24  *
25  * It receives [PanelAction] from the main state machine and then processes it or redirects
26  * it to a specific [PanelActionReducer].
27  *
28  * @property panelActionReducers a map of all of the [PanelActionReducer] available in the system.
29  */
30 internal class PanelController @Inject constructor(
31     private val panelActionReducers: Map<
32         Class<out PanelActionReducer>,
33         @JvmSuppressWildcards Provider<PanelActionReducer>
34         >,
35 ) {
36 
37     private var currentPanelActionReducer: PanelActionReducer? = null
38 
handleActionnull39     fun handleAction(panel: Panel?, action: PanelAction): Panel? = when (action) {
40         is OpenPanelAction -> {
41             currentPanelActionReducer = panelActionReducers[action.panelClass.java]?.get()
42             currentPanelActionReducer?.bundle = action.bundle
43             currentPanelActionReducer?.build()
44         }
45 
46         ClosePanelAction -> {
47             currentPanelActionReducer = null
48             null
49         }
50 
51         ReloadPanelAction -> {
52             currentPanelActionReducer?.build()
53         }
54 
55         else -> {
56             // Here there has to be a valid panel and a valid panelReducer, otherwise it should crash.
57             requireNotNull(panel)
58             currentPanelActionReducer?.reduce(panel, action)
59         }
60     }
61 }
62