1 /*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package sun.util.locale.provider;
26
27 import static java.util.Calendar.*;
28 import java.util.Comparator;
29 import java.util.Locale;
30 import java.util.Map;
31 import java.util.Set;
32 import java.util.TreeMap;
33 import java.util.spi.CalendarNameProvider;
34
35 /**
36 * Concrete implementation of the {@link java.util.spi.CalendarDataProvider
37 * CalendarDataProvider} class for the JRE LocaleProviderAdapter.
38 *
39 * @author Masayoshi Okutsu
40 * @author Naoto Sato
41 */
42 public class CalendarNameProviderImpl extends CalendarNameProvider implements AvailableLanguageTags {
43 private final LocaleProviderAdapter.Type type;
44 private final Set<String> langtags;
45
46 public CalendarNameProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {
47 this.type = type;
48 this.langtags = langtags;
49 }
50
51 @Override
52 public String getDisplayName(String calendarType, int field, int value, int style, Locale locale) {
53 String name = null;
54 String key = getResourceKey(calendarType, field, style);
55 if (key != null) {
56 String[] strings = LocaleProviderAdapter.forType(type).getLocaleResources(locale).getCalendarNames(key);
57 if (strings != null && strings.length > 0) {
58 if (field == DAY_OF_WEEK || field == YEAR) {
59 --value;
60 }
61 if (value < 0 || value >= strings.length) {
62 return null;
63 }
64 name = strings[value];
65 // If name is empty in standalone, try its `format' style.
66 if (name.length() == 0
67 && (style == SHORT_STANDALONE || style == LONG_STANDALONE
68 || style == NARROW_STANDALONE)) {
69 name = getDisplayName(calendarType, field, value,
70 getBaseStyle(style),
71 locale);
72 }
73 }
74 }
75 return name;
76 }
77
78 private static int[] REST_OF_STYLES = {
79 SHORT_STANDALONE, LONG_FORMAT, LONG_STANDALONE,
80 NARROW_FORMAT, NARROW_STANDALONE
81 };
82 @Override
83 public Map<String, Integer> getDisplayNames(String calendarType, int field, int style, Locale locale) {
84 Map<String, Integer> names;
85 if (style == ALL_STYLES) {
86 names = getDisplayNamesImpl(calendarType, field, SHORT_FORMAT, locale);
87 for (int st : REST_OF_STYLES) {
88 names.putAll(getDisplayNamesImpl(calendarType, field, st, locale));
89 }
90 } else {
91 // specific style
92 names = getDisplayNamesImpl(calendarType, field, style, locale);
93 }
94 return names.isEmpty() ? null : names;
95 }
96
97 private Map<String, Integer> getDisplayNamesImpl(String calendarType, int field,
98 int style, Locale locale) {
99 String key = getResourceKey(calendarType, field, style);
100 Map<String, Integer> map = new TreeMap<>(LengthBasedComparator.INSTANCE);
101 if (key != null) {
102 String[] strings = LocaleProviderAdapter.forType(type).getLocaleResources(locale).getCalendarNames(key);
103 if (strings != null) {
104 if (!hasDuplicates(strings)) {
105 if (field == YEAR) {
106 if (strings.length > 0) {
107 map.put(strings[0], 1);
108 }
109 } else {
110 int base = (field == DAY_OF_WEEK) ? 1 : 0;
111 for (int i = 0; i < strings.length; i++) {
112 String name = strings[i];
113 // Ignore any empty string (some standalone month names
114 // are not defined)
115 if (name.length() == 0) {
116 continue;
117 }
118 map.put(name, base + i);
119 }
120 }
121 }
122 }
123 }
124 return map;
125 }
126
127 private int getBaseStyle(int style) {
128 return style & ~(SHORT_STANDALONE - SHORT_FORMAT);
129 }
130
131 /**
132 * Comparator implementation for TreeMap which iterates keys from longest
133 * to shortest.
134 */
135 private static class LengthBasedComparator implements Comparator<String> {
136 private static final LengthBasedComparator INSTANCE = new LengthBasedComparator();
137
138 private LengthBasedComparator() {
139 }
140
141 @Override
142 public int compare(String o1, String o2) {
143 int n = o2.length() - o1.length();
144 return (n == 0) ? o1.compareTo(o2) : n;
145 }
146 }
147
148 @Override
149 public Locale[] getAvailableLocales() {
150 return LocaleProviderAdapter.toLocaleArray(langtags);
151 }
152
153 @Override
154 public boolean isSupportedLocale(Locale locale) {
155 if (Locale.ROOT.equals(locale)) {
156 return true;
157 }
158 String calendarType = null;
159 if (locale.hasExtensions()) {
160 calendarType = locale.getUnicodeLocaleType("ca");
161 locale = locale.stripExtensions();
162 }
163
164 if (calendarType != null) {
165 switch (calendarType) {
166 case "buddhist":
167 case "japanese":
168 case "gregory":
169 case "islamic":
170 case "roc":
171 break;
172 default:
173 // Unknown calendar type
174 return false;
175 }
176 }
177 if (langtags.contains(locale.toLanguageTag())) {
178 return true;
179 }
180 if (type == LocaleProviderAdapter.Type.JRE) {
181 String oldname = locale.toString().replace('_', '-');
182 return langtags.contains(oldname);
183 }
184 return false;
185 }
186
187 @Override
188 public Set<String> getAvailableLanguageTags() {
189 return langtags;
190 }
191
192 private boolean hasDuplicates(String[] strings) {
193 int len = strings.length;
194 for (int i = 0; i < len - 1; i++) {
195 String a = strings[i];
196 if (a != null) {
197 for (int j = i + 1; j < len; j++) {
198 if (a.equals(strings[j])) {
199 return true;
200 }
201 }
202 }
203 }
204 return false;
205 }
206
207 private String getResourceKey(String type, int field, int style) {
208 int baseStyle = getBaseStyle(style);
209 boolean isStandalone = (style != baseStyle);
210
211 if ("gregory".equals(type)) {
212 type = null;
213 }
214 boolean isNarrow = (baseStyle == NARROW_FORMAT);
215 StringBuilder key = new StringBuilder();
216 switch (field) {
217 case ERA:
218 if (type != null) {
219 key.append(type).append('.');
220 }
221 if (isNarrow) {
222 key.append("narrow.");
223 } else {
224 // JRE and CLDR use different resource key conventions
225 // due to historical reasons. (JRE DateFormatSymbols.getEras returns
226 // abbreviations while other getShort*() return abbreviations.)
227 if (this.type == LocaleProviderAdapter.Type.JRE) {
228 if (baseStyle == SHORT) {
229 key.append("short.");
230 }
231 } else { // CLDR
232 if (baseStyle == LONG) {
233 key.append("long.");
234 }
235 }
236 }
237 key.append("Eras");
238 break;
239
240 case YEAR:
241 if (!isNarrow) {
242 key.append(type).append(".FirstYear");
243 }
244 break;
245
246 case MONTH:
247 if ("islamic".equals(type)) {
248 key.append(type).append('.');
249 }
250 if (isStandalone) {
251 key.append("standalone.");
252 }
253 key.append("Month").append(toStyleName(baseStyle));
254 break;
255
256 case DAY_OF_WEEK:
257 // support standalone narrow day names
258 if (isStandalone && isNarrow) {
259 key.append("standalone.");
260 }
261 key.append("Day").append(toStyleName(baseStyle));
262 break;
263
264 case AM_PM:
265 if (isNarrow) {
266 key.append("narrow.");
267 }
268 key.append("AmPmMarkers");
269 break;
270 }
271 return key.length() > 0 ? key.toString() : null;
272 }
273
274 private String toStyleName(int baseStyle) {
275 switch (baseStyle) {
276 case SHORT:
277 return "Abbreviations";
278 case NARROW_FORMAT:
279 return "Narrows";
280 }
281 return "Names";
282 }
283 }