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 
17 package com.android.usbtuner.util;
18 
19 import java.util.HashSet;
20 import java.util.Locale;
21 
22 /**
23  * Utility class for ISO codes.
24  */
25 public final class IsoUtils {
26     private static final HashSet<String> ISO3_LANGUAGES = new HashSet<>();
27 
28     static {
29         String[] languages = Locale.getISOLanguages();
30         for (String lang : languages) {
31             Locale locale = new Locale(lang);
locale.getISO3Language()32             ISO3_LANGUAGES.add(locale.getISO3Language());
33         }
34     }
35 
IsoUtils()36     private IsoUtils() { }
37 
38     /**
39      * Returns {@code true} if a {@link String} is a valid ISO-639-2/T language code.
40      */
isValidIso3Language(String langCode)41     public static boolean isValidIso3Language(String langCode) {
42         return ISO3_LANGUAGES.contains(langCode);
43     }
44 }
45