1/*
2 * Copyright (C) 2017 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.support.v4.os;
18
19import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
20
21import android.support.annotation.RestrictTo;
22
23import java.util.Locale;
24
25/**
26 * Helper to deal with new {@link Locale} APIs in a backwards compatible fashion.
27 *
28 * @hide
29 */
30@RestrictTo(LIBRARY_GROUP)
31final class LocaleHelper {
32
33    // Simpleton implementation for Locale.forLanguageTag(...)
34    static Locale forLanguageTag(String str) {
35        if (str.contains("-")) {
36            String[] args = str.split("-");
37            if (args.length > 2) {
38                return new Locale(args[0], args[1], args[2]);
39            } else if (args.length > 1) {
40                return new Locale(args[0], args[1]);
41            } else if (args.length == 1) {
42                return new Locale(args[0]);
43            }
44        } else if (str.contains("_")) {
45            String[] args = str.split("_");
46            if (args.length > 2) {
47                return new Locale(args[0], args[1], args[2]);
48            } else if (args.length > 1) {
49                return new Locale(args[0], args[1]);
50            } else if (args.length == 1) {
51                return new Locale(args[0]);
52            }
53        } else {
54            return new Locale(str);
55        }
56
57        throw new IllegalArgumentException("Can not parse language tag: [" + str + "]");
58    }
59
60    // Simpleton implementation for Locale.toLanguageTag(...)
61    static String toLanguageTag(Locale locale) {
62        StringBuilder buf = new StringBuilder();
63        buf.append(locale.getLanguage());
64        final String country = locale.getCountry();
65        if (country != null && !country.equals("")) {
66            buf.append("-");
67            buf.append(locale.getCountry());
68        }
69
70        return buf.toString();
71    }
72}
73