MountServiceInternal.java revision 6ee871e59812fea4525c50231f677c4bd10c74b8 
1/*
2 * Copyright (C) 2015 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
17package android.os.storage;
18
19/**
20 * Mount service local interface.
21 *
22 * @hide Only for use within the system server.
23 */
24public abstract class MountServiceInternal {
25
26    /**
27     * Policy that influences how external storage is mounted and reported.
28     */
29    public interface ExternalStorageMountPolicy {
30        /**
31         * Gets the external storage mount mode for the given uid.
32         *
33         * @param uid The UID for which to determine mount mode.
34         * @param packageName The package in the UID for making the call.
35         * @return The mount mode.
36         *
37         * @see com.android.internal.os.Zygote#MOUNT_EXTERNAL_NONE
38         * @see com.android.internal.os.Zygote#MOUNT_EXTERNAL_DEFAULT
39         * @see com.android.internal.os.Zygote#MOUNT_EXTERNAL_READ
40         * @see com.android.internal.os.Zygote#MOUNT_EXTERNAL_WRITE
41         */
42        public int getMountMode(int uid, String packageName);
43
44        /**
45         * Gets whether external storage should be reported to the given UID.
46         *
47         * @param uid The UID for which to determine whether it has external storage.
48         * @param packageName The package in the UID for making the call.
49         * @return Weather to report external storage.
50         * @return True to report the state of external storage, false to
51         *     report it as unmounted.
52         */
53        public boolean hasExternalStorage(int uid, String packageName);
54    }
55
56    /**
57     * Adds a policy for determining how external storage is mounted and reported.
58     * The mount mode is the most conservative result from querying all registered
59     * policies. Similarly, the reported state is the most conservative result from
60     * querying all registered policies.
61     *
62     * @param policy The policy to add.
63     */
64    public abstract void addExternalStoragePolicy(ExternalStorageMountPolicy policy);
65
66    /**
67     * Notify the mount service that the mount policy for a UID changed.
68     * @param uid The UID for which policy changed.
69     * @param packageName The package in the UID for making the call.
70     */
71    public abstract void onExternalStoragePolicyChanged(int uid, String packageName);
72
73    /**
74     * Gets the mount mode to use for a given UID as determined by consultin all
75     * policies.
76     *
77     * @param uid The UID for which to get mount mode.
78     * @param packageName The package in the UID for making the call.
79     * @return The mount mode.
80     */
81    public abstract int getExternalStorageMountMode(int uid, String packageName);
82}
83