1
2/*
3 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.  Oracle designates this
9 * particular file as subject to the "Classpath" exception as provided
10 * by Oracle in the LICENSE file that accompanied this code.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
23 * or visit www.oracle.com if you need additional information or have any
24 * questions.
25 */
26
27/*
28 *******************************************************************************
29 * Copyright (C) 2009-2010, International Business Machines Corporation and    *
30 * others. All Rights Reserved.                                                *
31 *******************************************************************************
32 */
33package sun.util.locale;
34
35import java.util.Collections;
36import java.util.Map;
37import java.util.Map.Entry;
38import java.util.Set;
39import java.util.SortedMap;
40import java.util.SortedSet;
41import java.util.StringJoiner;
42
43public class UnicodeLocaleExtension extends Extension {
44    public static final char SINGLETON = 'u';
45
46    private final Set<String> attributes;
47    private final Map<String, String> keywords;
48
49    public static final UnicodeLocaleExtension CA_JAPANESE
50        = new UnicodeLocaleExtension("ca", "japanese");
51    public static final UnicodeLocaleExtension NU_THAI
52        = new UnicodeLocaleExtension("nu", "thai");
53
54    private UnicodeLocaleExtension(String key, String value) {
55        super(SINGLETON, key + "-" + value);
56        attributes = Collections.emptySet();
57        keywords = Collections.singletonMap(key, value);
58    }
59
60    UnicodeLocaleExtension(SortedSet<String> attributes, SortedMap<String, String> keywords) {
61        super(SINGLETON);
62        if (attributes != null) {
63            this.attributes = attributes;
64        } else {
65            this.attributes = Collections.emptySet();
66        }
67        if (keywords != null) {
68            this.keywords = keywords;
69        } else {
70            this.keywords = Collections.emptyMap();
71        }
72
73        if (!this.attributes.isEmpty() || !this.keywords.isEmpty()) {
74            StringJoiner sj = new StringJoiner(LanguageTag.SEP);
75            for (String attribute : this.attributes) {
76                sj.add(attribute);
77            }
78            for (Entry<String, String> keyword : this.keywords.entrySet()) {
79                String key = keyword.getKey();
80                String value = keyword.getValue();
81
82                sj.add(key);
83                if (value.length() > 0) {
84                    sj.add(value);
85                }
86            }
87            setValue(sj.toString());
88        }
89    }
90
91    public Set<String> getUnicodeLocaleAttributes() {
92        if (attributes == Collections.EMPTY_SET) {
93            return attributes;
94        }
95        return Collections.unmodifiableSet(attributes);
96    }
97
98    public Set<String> getUnicodeLocaleKeys() {
99        if (keywords == Collections.EMPTY_MAP) {
100            return Collections.emptySet();
101        }
102        return Collections.unmodifiableSet(keywords.keySet());
103    }
104
105    public String getUnicodeLocaleType(String unicodeLocaleKey) {
106        return keywords.get(unicodeLocaleKey);
107    }
108
109    public static boolean isSingletonChar(char c) {
110        return (SINGLETON == LocaleUtils.toLower(c));
111    }
112
113    public static boolean isAttribute(String s) {
114        // 3*8alphanum
115        int len = s.length();
116        return (len >= 3) && (len <= 8) && LocaleUtils.isAlphaNumericString(s);
117    }
118
119    public static boolean isKey(String s) {
120        // 2alphanum
121        return (s.length() == 2) && LocaleUtils.isAlphaNumericString(s);
122    }
123
124    public static boolean isTypeSubtag(String s) {
125        // 3*8alphanum
126        int len = s.length();
127        return (len >= 3) && (len <= 8) && LocaleUtils.isAlphaNumericString(s);
128    }
129}
130