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.settings.connecteddevice.audiosharing;
18 
19 import com.android.settings.widget.ValidatedEditTextPreference;
20 
21 import java.nio.charset.StandardCharsets;
22 
23 /**
24  * Validator for Audio Sharing Name, which should be a UTF-8 encoded string containing a minimum of
25  * 4 characters and a maximum of 32 human-readable characters.
26  */
27 public class AudioSharingNameTextValidator implements ValidatedEditTextPreference.Validator {
28     private static final int MIN_LENGTH = 4;
29     private static final int MAX_LENGTH = 32;
30 
31     @Override
isTextValid(String value)32     public boolean isTextValid(String value) {
33         if (value == null || value.length() < MIN_LENGTH || value.length() > MAX_LENGTH) {
34             return false;
35         }
36         return isValidUTF8(value);
37     }
38 
isValidUTF8(String value)39     private static boolean isValidUTF8(String value) {
40         byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
41         String reconstructedString = new String(bytes, StandardCharsets.UTF_8);
42         return value.equals(reconstructedString);
43     }
44 }
45