1 
   2 /*
   3  * Copyright (c) 2010, 2011, 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  */
  33 package sun.util.locale;
  34 
  35 import java.util.Collections;
  36 import java.util.Map;
  37 import java.util.Map.Entry;
  38 import java.util.Set;
  39 import java.util.SortedMap;
  40 import java.util.SortedSet;
  41 
  42 public class UnicodeLocaleExtension extends Extension {
  43     public static final char SINGLETON = 'u';
  44 
  45     private final Set<String> attributes;
  46     private final Map<String, String> keywords;
  47 
  48     public static final UnicodeLocaleExtension CA_JAPANESE
  49         = new UnicodeLocaleExtension("ca", "japanese");
  50     public static final UnicodeLocaleExtension NU_THAI
  51         = new UnicodeLocaleExtension("nu", "thai");
  52 
  53     private UnicodeLocaleExtension(String key, String value) {
  54         super(SINGLETON, key + "-" + value);
  55         attributes = Collections.emptySet();
  56         keywords = Collections.singletonMap(key, value);
  57     }
  58 
  59     UnicodeLocaleExtension(SortedSet<String> attributes, SortedMap<String, String> keywords) {
  60         super(SINGLETON);
  61         if (attributes != null) {
  62             this.attributes = attributes;
  63         } else {
  64             this.attributes = Collections.emptySet();
  65         }
  66         if (keywords != null) {
  67             this.keywords = keywords;
  68         } else {
  69             this.keywords = Collections.emptyMap();
  70         }
  71 
  72         if (!this.attributes.isEmpty() || !this.keywords.isEmpty()) {
  73             StringBuilder sb = new StringBuilder();
  74             for (String attribute : this.attributes) {
  75                 sb.append(LanguageTag.SEP).append(attribute);
  76             }
  77             for (Entry<String, String> keyword : this.keywords.entrySet()) {
  78                 String key = keyword.getKey();
  79                 String value = keyword.getValue();
  80 
  81                 sb.append(LanguageTag.SEP).append(key);
  82                 if (value.length() > 0) {
  83                     sb.append(LanguageTag.SEP).append(value);
  84                 }
  85             }
  86             setValue(sb.substring(1));   // skip leading '-'
  87         }
  88     }
  89 
  90     public Set<String> getUnicodeLocaleAttributes() {
  91         if (attributes == Collections.EMPTY_SET) {
  92             return attributes;
  93         }
  94         return Collections.unmodifiableSet(attributes);
  95     }
  96 
  97     public Set<String> getUnicodeLocaleKeys() {
  98         if (keywords == Collections.EMPTY_MAP) {
  99             return Collections.emptySet();
 100         }
 101         return Collections.unmodifiableSet(keywords.keySet());
 102     }
 103 
 104     public String getUnicodeLocaleType(String unicodeLocaleKey) {
 105         return keywords.get(unicodeLocaleKey);
 106     }
 107 
 108     public static boolean isSingletonChar(char c) {
 109         return (SINGLETON == LocaleUtils.toLower(c));
 110     }
 111 
 112     public static boolean isAttribute(String s) {
 113         // 3*8alphanum
 114         int len = s.length();
 115         return (len >= 3) && (len <= 8) && LocaleUtils.isAlphaNumericString(s);
 116     }
 117 
 118     public static boolean isKey(String s) {
 119         // 2alphanum
 120         return (s.length() == 2) && LocaleUtils.isAlphaNumericString(s);
 121     }
 122 
 123     public static boolean isTypeSubtag(String s) {
 124         // 3*8alphanum
 125         int len = s.length();
 126         return (len >= 3) && (len <= 8) && LocaleUtils.isAlphaNumericString(s);
 127     }
 128 }