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1 /*
2  * Copyright (C) 2013 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.camera.app;
18 
19 import android.content.Context;
20 import android.content.Intent;
21 
22 import com.android.camera.module.ModuleController;
23 import com.android.camera.settings.SettingsManager;
24 
25 import java.util.List;
26 
27 /**
28  * The module manager which maintains the
29  * {@link ModuleManagerImpl.ModuleAgent}.
30  */
31 public interface ModuleManager {
32     public static int MODULE_INDEX_NONE = -1;
33 
34     /**
35      * The module agent which is responsible for maintaining the static
36      * characteristics and the creation of the module.
37      */
38     public static interface ModuleAgent {
39 
40         /**
41          * @return The module ID.
42          */
getModuleId()43         public int getModuleId();
44 
45         /**
46          * @return Whether the module will request the app for the camera.
47          */
requestAppForCamera()48         public boolean requestAppForCamera();
49 
50         /**
51          * @return A string which is used to get the namespace for settings in
52          * the module scope.
53          */
getScopeNamespace()54         public String getScopeNamespace();
55 
56         /**
57          * Creates the module.
58          *
59          * @param app The {@link com.android.camera.app.AppController} which
60          *            creates this module.
61          * @param intent The {@link android.content.Intent} which starts the activity.
62          * @return The module.
63          */
createModule(AppController app, Intent intent)64         public ModuleController createModule(AppController app, Intent intent);
65     }
66 
67     /**
68      * Registers a module. A module will be available only if its agent is
69      * registered. The registration might fail.
70      *
71      * @param agent The {@link com.android.camera.app.ModuleManager.ModuleAgent}
72      *              of the module.
73      * @throws java.lang.NullPointerException if the {@code agent} is null.
74      * @throws java.lang.IllegalArgumentException if the module ID is
75      * {@code MODULE_INDEX} or another module with the sameID is registered
76      * already.
77      */
registerModule(ModuleAgent agent)78     void registerModule(ModuleAgent agent);
79 
80     /**
81      * Unregister a module.
82      *
83      * @param moduleId The module ID.
84      * @return Whether the un-registration succeeds.
85      */
unregisterModule(int moduleId)86     boolean unregisterModule(int moduleId);
87 
88     /**
89      * @return A {@link java.util.List} of the
90      * {@link com.android.camera.app.ModuleManager.ModuleAgent} of all the
91      * registered modules.
92      */
getRegisteredModuleAgents()93     List<ModuleAgent> getRegisteredModuleAgents();
94 
95     /**
96      * @return A {@link java.util.List} of the
97      * {@link com.android.camera.app.ModuleManager.ModuleAgent} of all the
98      * registered modules' indices.
99      */
getSupportedModeIndexList()100     List<Integer> getSupportedModeIndexList();
101 
102     /**
103      * Sets the default module index. No-op if the module index does not exist.
104      *
105      * @param moduleId The ID of the default module.
106      * @return Whether the {@code moduleId} exists.
107      */
setDefaultModuleIndex(int moduleId)108     boolean setDefaultModuleIndex(int moduleId);
109 
110     /**
111      * @return The default module index. {@code MODULE_INDEX_NONE} if not set.
112      */
getDefaultModuleIndex()113     int getDefaultModuleIndex();
114 
115     /**
116      * Returns the {@link com.android.camera.app.ModuleManager.ModuleAgent} by
117      * the module ID.
118      *
119      * @param moduleId The module ID.
120      * @return The agent.
121      */
getModuleAgent(int moduleId)122     ModuleAgent getModuleAgent(int moduleId);
123 
124     /**
125      * Gets the mode that can be switched to from the given mode id through
126      * quick switch.
127      *
128      * @param moduleId index of the mode to switch from
129      * @param settingsManager settings manager for querying last used camera module
130      * @param context the context the activity is running in
131      * @return mode id to quick switch to if index is valid, otherwise returns
132      *         the given mode id itself
133      */
getQuickSwitchToModuleId(int moduleId, SettingsManager settingsManager, Context context)134     int getQuickSwitchToModuleId(int moduleId, SettingsManager settingsManager, Context context);
135 }
136