1 /*
2  * Copyright 2020 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 android.media;
18 
19 import android.annotation.NonNull;
20 import android.annotation.Nullable;
21 import android.text.TextUtils;
22 import android.util.Log;
23 
24 /**
25  * @hide
26  */
27 public class MediaRouter2Utils {
28 
29     static final String TAG = "MR2Utils";
30     static final String SEPARATOR = ":";
31 
32     @NonNull
toUniqueId(@onNull String providerId, @NonNull String id)33     public static String toUniqueId(@NonNull String providerId, @NonNull String id) {
34         if (TextUtils.isEmpty(providerId)) {
35             Log.w(TAG, "toUniqueId: providerId shouldn't be empty");
36             return null;
37         }
38         if (TextUtils.isEmpty(id)) {
39             Log.w(TAG, "toUniqueId: id shouldn't be null");
40             return null;
41         }
42 
43         return providerId + SEPARATOR + id;
44     }
45 
46     /**
47      * Gets provider ID from unique ID.
48      * If the corresponding provider ID could not be generated, it will return null.
49      */
50     @Nullable
getProviderId(@onNull String uniqueId)51     public static String getProviderId(@NonNull String uniqueId) {
52         if (TextUtils.isEmpty(uniqueId)) {
53             Log.w(TAG, "getProviderId: uniqueId shouldn't be empty");
54             return null;
55         }
56 
57         int firstIndexOfSeparator = uniqueId.indexOf(SEPARATOR);
58         if (firstIndexOfSeparator == -1) {
59             return null;
60         }
61 
62         String providerId = uniqueId.substring(0, firstIndexOfSeparator);
63         if (TextUtils.isEmpty(providerId)) {
64             return null;
65         }
66 
67         return providerId;
68     }
69 
70     /**
71      * Gets the original ID (i.e. non-unique route/session ID) from unique ID.
72      * If the corresponding ID could not be generated, it will return null.
73      */
74     @Nullable
getOriginalId(@onNull String uniqueId)75     public static String getOriginalId(@NonNull String uniqueId) {
76         if (TextUtils.isEmpty(uniqueId)) {
77             Log.w(TAG, "getOriginalId: uniqueId shouldn't be empty");
78             return null;
79         }
80 
81         int firstIndexOfSeparator = uniqueId.indexOf(SEPARATOR);
82         if (firstIndexOfSeparator == -1 || firstIndexOfSeparator + 1 >= uniqueId.length()) {
83             return null;
84         }
85 
86         String providerId = uniqueId.substring(firstIndexOfSeparator + 1);
87         if (TextUtils.isEmpty(providerId)) {
88             return null;
89         }
90 
91         return providerId;
92     }
93 }
94