1 /*
2 * Copyright (c) 1996, 2018, 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
26 /*
27 * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved
28 * (C) Copyright IBM Corp. 1996 - All Rights Reserved
29 *
30 * The original version of this source code and documentation is copyrighted
31 * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
32 * materials are provided under terms of a License Agreement between Taligent
33 * and Sun. This technology is protected by multiple US and International
34 * patents. This notice and attribution to Taligent may not be removed.
35 * Taligent is a registered trademark of Taligent, Inc.
36 *
37 */
38
39 package java.text;
40
41 import java.io.IOException;
42 import java.io.ObjectOutputStream;
43 import java.io.Serializable;
44 import java.lang.ref.SoftReference;
45 import java.text.spi.DateFormatSymbolsProvider;
46 import java.util.Arrays;
47 import java.util.Locale;
48 import java.util.Objects;
49 import java.util.ResourceBundle;
50 import java.util.concurrent.ConcurrentHashMap;
51 import java.util.concurrent.ConcurrentMap;
52 import sun.util.locale.provider.CalendarDataUtility;
53 import sun.util.locale.provider.LocaleProviderAdapter;
54 import sun.util.locale.provider.LocaleServiceProviderPool;
55 import sun.util.locale.provider.ResourceBundleBasedAdapter;
56 import sun.util.locale.provider.TimeZoneNameUtility;
57
58 /**
59 * <code>DateFormatSymbols</code> is a public class for encapsulating
60 * localizable date-time formatting data, such as the names of the
61 * months, the names of the days of the week, and the time zone data.
62 * <code>SimpleDateFormat</code> uses
63 * <code>DateFormatSymbols</code> to encapsulate this information.
64 *
65 * <p>
66 * Typically you shouldn't use <code>DateFormatSymbols</code> directly.
67 * Rather, you are encouraged to create a date-time formatter with the
68 * <code>DateFormat</code> class's factory methods: <code>getTimeInstance</code>,
69 * <code>getDateInstance</code>, or <code>getDateTimeInstance</code>.
70 * These methods automatically create a <code>DateFormatSymbols</code> for
71 * the formatter so that you don't have to. After the
72 * formatter is created, you may modify its format pattern using the
73 * <code>setPattern</code> method. For more information about
74 * creating formatters using <code>DateFormat</code>'s factory methods,
75 * see {@link DateFormat}.
76 *
77 * <p>
78 * If you decide to create a date-time formatter with a specific
79 * format pattern for a specific locale, you can do so with:
80 * <blockquote>
81 * <pre>
82 * new SimpleDateFormat(aPattern, DateFormatSymbols.getInstance(aLocale)).
83 * </pre>
84 * </blockquote>
85 *
86 * <p>If the locale contains "rg" (region override)
87 * <a href="../util/Locale.html#def_locale_extension">Unicode extension</a>,
88 * the symbols are overridden for the designated region.
89 *
90 * <p>
91 * <code>DateFormatSymbols</code> objects are cloneable. When you obtain
92 * a <code>DateFormatSymbols</code> object, feel free to modify the
93 * date-time formatting data. For instance, you can replace the localized
94 * date-time format pattern characters with the ones that you feel easy
95 * to remember. Or you can change the representative cities
96 * to your favorite ones.
97 *
98 * <p>
99 * New <code>DateFormatSymbols</code> subclasses may be added to support
100 * <code>SimpleDateFormat</code> for date-time formatting for additional locales.
101
102 * @see DateFormat
103 * @see SimpleDateFormat
104 * @see java.util.SimpleTimeZone
105 * @author Chen-Lieh Huang
106 * @since 1.1
107 */
108 public class DateFormatSymbols implements Serializable, Cloneable {
109
110 /**
111 * Construct a DateFormatSymbols object by loading format data from
112 * resources for the default {@link java.util.Locale.Category#FORMAT FORMAT}
113 * locale. This constructor can only
114 * construct instances for the locales supported by the Java
115 * runtime environment, not for those supported by installed
116 * {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
117 * implementations. For full locale coverage, use the
118 * {@link #getInstance(Locale) getInstance} method.
119 * <p>This is equivalent to calling
120 * {@link #DateFormatSymbols(Locale)
121 * DateFormatSymbols(Locale.getDefault(Locale.Category.FORMAT))}.
122 * @see #getInstance()
123 * @see java.util.Locale#getDefault(java.util.Locale.Category)
124 * @see java.util.Locale.Category#FORMAT
125 * @exception java.util.MissingResourceException
126 * if the resources for the default locale cannot be
127 * found or cannot be loaded.
128 */
129 public DateFormatSymbols()
130 {
131 initializeData(Locale.getDefault(Locale.Category.FORMAT));
132 }
133
134 /**
135 * Construct a DateFormatSymbols object by loading format data from
136 * resources for the given locale. This constructor can only
137 * construct instances for the locales supported by the Java
138 * runtime environment, not for those supported by installed
139 * {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
140 * implementations. For full locale coverage, use the
141 * {@link #getInstance(Locale) getInstance} method.
142 *
143 * @param locale the desired locale
144 * @see #getInstance(Locale)
145 * @exception java.util.MissingResourceException
146 * if the resources for the specified locale cannot be
147 * found or cannot be loaded.
148 */
149 public DateFormatSymbols(Locale locale)
150 {
151 initializeData(locale);
152 }
153
154 /**
155 * Constructs an uninitialized DateFormatSymbols.
156 */
157 private DateFormatSymbols(boolean flag) {
158 }
159
160 /**
161 * Era strings. For example: "AD" and "BC". An array of 2 strings,
162 * indexed by <code>Calendar.BC</code> and <code>Calendar.AD</code>.
163 * @serial
164 */
165 String eras[] = null;
166
167 /**
168 * Month strings. For example: "January", "February", etc. An array
169 * of 13 strings (some calendars have 13 months), indexed by
170 * <code>Calendar.JANUARY</code>, <code>Calendar.FEBRUARY</code>, etc.
171 * @serial
172 */
173 String months[] = null;
174
175 /**
176 * Short month strings. For example: "Jan", "Feb", etc. An array of
177 * 13 strings (some calendars have 13 months), indexed by
178 * <code>Calendar.JANUARY</code>, <code>Calendar.FEBRUARY</code>, etc.
179
180 * @serial
181 */
182 String shortMonths[] = null;
183
184 /**
185 * Weekday strings. For example: "Sunday", "Monday", etc. An array
186 * of 8 strings, indexed by <code>Calendar.SUNDAY</code>,
187 * <code>Calendar.MONDAY</code>, etc.
188 * The element <code>weekdays[0]</code> is ignored.
189 * @serial
190 */
191 String weekdays[] = null;
192
193 /**
194 * Short weekday strings. For example: "Sun", "Mon", etc. An array
195 * of 8 strings, indexed by <code>Calendar.SUNDAY</code>,
196 * <code>Calendar.MONDAY</code>, etc.
197 * The element <code>shortWeekdays[0]</code> is ignored.
198 * @serial
199 */
200 String shortWeekdays[] = null;
201
202 /**
203 * AM and PM strings. For example: "AM" and "PM". An array of
204 * 2 strings, indexed by <code>Calendar.AM</code> and
205 * <code>Calendar.PM</code>.
206 * @serial
207 */
208 String ampms[] = null;
209
210 /**
211 * Localized names of time zones in this locale. This is a
212 * two-dimensional array of strings of size <em>n</em> by <em>m</em>,
213 * where <em>m</em> is at least 5. Each of the <em>n</em> rows is an
214 * entry containing the localized names for a single <code>TimeZone</code>.
215 * Each such row contains (with <code>i</code> ranging from
216 * 0..<em>n</em>-1):
217 * <ul>
218 * <li><code>zoneStrings[i][0]</code> - time zone ID</li>
219 * <li><code>zoneStrings[i][1]</code> - long name of zone in standard
220 * time</li>
221 * <li><code>zoneStrings[i][2]</code> - short name of zone in
222 * standard time</li>
223 * <li><code>zoneStrings[i][3]</code> - long name of zone in daylight
224 * saving time</li>
225 * <li><code>zoneStrings[i][4]</code> - short name of zone in daylight
226 * saving time</li>
227 * </ul>
228 * The zone ID is <em>not</em> localized; it's one of the valid IDs of
229 * the {@link java.util.TimeZone TimeZone} class that are not
230 * <a href="../util/TimeZone.html#CustomID">custom IDs</a>.
231 * All other entries are localized names.
232 * @see java.util.TimeZone
233 * @serial
234 */
235 String zoneStrings[][] = null;
236
237 /**
238 * Indicates that zoneStrings is set externally with setZoneStrings() method.
239 */
240 transient boolean isZoneStringsSet = false;
241
242 /**
243 * Unlocalized date-time pattern characters. For example: 'y', 'd', etc.
244 * All locales use the same these unlocalized pattern characters.
245 */
246 static final String patternChars = "GyMdkHmsSEDFwWahKzZYuXL";
247
248 static final int PATTERN_ERA = 0; // G
249 static final int PATTERN_YEAR = 1; // y
250 static final int PATTERN_MONTH = 2; // M
251 static final int PATTERN_DAY_OF_MONTH = 3; // d
252 static final int PATTERN_HOUR_OF_DAY1 = 4; // k
253 static final int PATTERN_HOUR_OF_DAY0 = 5; // H
254 static final int PATTERN_MINUTE = 6; // m
255 static final int PATTERN_SECOND = 7; // s
256 static final int PATTERN_MILLISECOND = 8; // S
257 static final int PATTERN_DAY_OF_WEEK = 9; // E
258 static final int PATTERN_DAY_OF_YEAR = 10; // D
259 static final int PATTERN_DAY_OF_WEEK_IN_MONTH = 11; // F
260 static final int PATTERN_WEEK_OF_YEAR = 12; // w
261 static final int PATTERN_WEEK_OF_MONTH = 13; // W
262 static final int PATTERN_AM_PM = 14; // a
263 static final int PATTERN_HOUR1 = 15; // h
264 static final int PATTERN_HOUR0 = 16; // K
265 static final int PATTERN_ZONE_NAME = 17; // z
266 static final int PATTERN_ZONE_VALUE = 18; // Z
267 static final int PATTERN_WEEK_YEAR = 19; // Y
268 static final int PATTERN_ISO_DAY_OF_WEEK = 20; // u
269 static final int PATTERN_ISO_ZONE = 21; // X
270 static final int PATTERN_MONTH_STANDALONE = 22; // L
271
272 /**
273 * Localized date-time pattern characters. For example, a locale may
274 * wish to use 'u' rather than 'y' to represent years in its date format
275 * pattern strings.
276 * This string must be exactly 18 characters long, with the index of
277 * the characters described by <code>DateFormat.ERA_FIELD</code>,
278 * <code>DateFormat.YEAR_FIELD</code>, etc. Thus, if the string were
279 * "Xz...", then localized patterns would use 'X' for era and 'z' for year.
280 * @serial
281 */
282 String localPatternChars = null;
283
284 /**
285 * The locale which is used for initializing this DateFormatSymbols object.
286 *
287 * @since 1.6
288 * @serial
289 */
290 Locale locale = null;
291
292 /* use serialVersionUID from JDK 1.1.4 for interoperability */
293 static final long serialVersionUID = -5987973545549424702L;
294
295 /**
296 * Returns an array of all locales for which the
297 * <code>getInstance</code> methods of this class can return
298 * localized instances.
299 * The returned array represents the union of locales supported by the
300 * Java runtime and by installed
301 * {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
302 * implementations. It must contain at least a <code>Locale</code>
303 * instance equal to {@link java.util.Locale#US Locale.US}.
304 *
305 * @return An array of locales for which localized
306 * <code>DateFormatSymbols</code> instances are available.
307 * @since 1.6
308 */
309 public static Locale[] getAvailableLocales() {
310 LocaleServiceProviderPool pool=
311 LocaleServiceProviderPool.getPool(DateFormatSymbolsProvider.class);
312 return pool.getAvailableLocales();
313 }
314
315 /**
316 * Gets the <code>DateFormatSymbols</code> instance for the default
317 * locale. This method provides access to <code>DateFormatSymbols</code>
318 * instances for locales supported by the Java runtime itself as well
319 * as for those supported by installed
320 * {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
321 * implementations.
322 * <p>This is equivalent to calling {@link #getInstance(Locale)
323 * getInstance(Locale.getDefault(Locale.Category.FORMAT))}.
324 * @see java.util.Locale#getDefault(java.util.Locale.Category)
325 * @see java.util.Locale.Category#FORMAT
326 * @return a <code>DateFormatSymbols</code> instance.
327 * @since 1.6
328 */
329 public static final DateFormatSymbols getInstance() {
330 return getInstance(Locale.getDefault(Locale.Category.FORMAT));
331 }
332
333 /**
334 * Gets the <code>DateFormatSymbols</code> instance for the specified
335 * locale. This method provides access to <code>DateFormatSymbols</code>
336 * instances for locales supported by the Java runtime itself as well
337 * as for those supported by installed
338 * {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
339 * implementations.
340 * @param locale the given locale.
341 * @return a <code>DateFormatSymbols</code> instance.
342 * @exception NullPointerException if <code>locale</code> is null
343 * @since 1.6
344 */
345 public static final DateFormatSymbols getInstance(Locale locale) {
346 DateFormatSymbols dfs = getProviderInstance(locale);
347 if (dfs != null) {
348 return dfs;
349 }
350 throw new RuntimeException("DateFormatSymbols instance creation failed.");
351 }
352
353 /**
354 * Returns a DateFormatSymbols provided by a provider or found in
355 * the cache. Note that this method returns a cached instance,
356 * not its clone. Therefore, the instance should never be given to
357 * an application.
358 */
359 static final DateFormatSymbols getInstanceRef(Locale locale) {
360 DateFormatSymbols dfs = getProviderInstance(locale);
361 if (dfs != null) {
362 return dfs;
363 }
364 throw new RuntimeException("DateFormatSymbols instance creation failed.");
365 }
366
367 private static DateFormatSymbols getProviderInstance(Locale locale) {
368 LocaleProviderAdapter adapter = LocaleProviderAdapter.getAdapter(DateFormatSymbolsProvider.class, locale);
369 DateFormatSymbolsProvider provider = adapter.getDateFormatSymbolsProvider();
370 DateFormatSymbols dfsyms = provider.getInstance(locale);
371 if (dfsyms == null) {
372 provider = LocaleProviderAdapter.forJRE().getDateFormatSymbolsProvider();
373 dfsyms = provider.getInstance(locale);
374 }
375 return dfsyms;
376 }
377
378 /**
379 * Gets era strings. For example: "AD" and "BC".
380 * @return the era strings.
381 */
382 public String[] getEras() {
383 return Arrays.copyOf(eras, eras.length);
384 }
385
386 /**
387 * Sets era strings. For example: "AD" and "BC".
388 * @param newEras the new era strings.
389 */
390 public void setEras(String[] newEras) {
391 eras = Arrays.copyOf(newEras, newEras.length);
392 cachedHashCode = 0;
393 }
394
395 /**
396 * Gets month strings. For example: "January", "February", etc.
397 * An array with either 12 or 13 elements will be returned depending
398 * on whether or not {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER}
399 * is supported. Use
400 * {@link java.util.Calendar#JANUARY Calendar.JANUARY},
401 * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY},
402 * etc. to index the result array.
403 *
404 * <p>If the language requires different forms for formatting and
405 * stand-alone usages, this method returns month names in the
406 * formatting form. For example, the preferred month name for
407 * January in the Czech language is <em>ledna</em> in the
408 * formatting form, while it is <em>leden</em> in the stand-alone
409 * form. This method returns {@code "ledna"} in this case. Refer
410 * to the <a href="http://unicode.org/reports/tr35/#Calendar_Elements">
411 * Calendar Elements in the Unicode Locale Data Markup Language
412 * (LDML) specification</a> for more details.
413 *
414 * @implSpec This method returns 13 elements since
415 * {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER} is supported.
416 * @return the month strings.
417 */
418 public String[] getMonths() {
419 return Arrays.copyOf(months, months.length);
420 }
421
422 /**
423 * Sets month strings. For example: "January", "February", etc.
424 * @param newMonths the new month strings. The array should
425 * be indexed by {@link java.util.Calendar#JANUARY Calendar.JANUARY},
426 * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY}, etc.
427 */
428 public void setMonths(String[] newMonths) {
429 months = Arrays.copyOf(newMonths, newMonths.length);
430 cachedHashCode = 0;
431 }
432
433 /**
434 * Gets short month strings. For example: "Jan", "Feb", etc.
435 * An array with either 12 or 13 elements will be returned depending
436 * on whether or not {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER}
437 * is supported. Use
438 * {@link java.util.Calendar#JANUARY Calendar.JANUARY},
439 * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY},
440 * etc. to index the result array.
441 *
442 * <p>If the language requires different forms for formatting and
443 * stand-alone usages, this method returns short month names in
444 * the formatting form. For example, the preferred abbreviation
445 * for January in the Catalan language is <em>de gen.</em> in the
446 * formatting form, while it is <em>gen.</em> in the stand-alone
447 * form. This method returns {@code "de gen."} in this case. Refer
448 * to the <a href="http://unicode.org/reports/tr35/#Calendar_Elements">
449 * Calendar Elements in the Unicode Locale Data Markup Language
450 * (LDML) specification</a> for more details.
451 *
452 * @implSpec This method returns 13 elements since
453 * {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER} is supported.
454 * @return the short month strings.
455 */
456 public String[] getShortMonths() {
457 return Arrays.copyOf(shortMonths, shortMonths.length);
458 }
459
460 /**
461 * Sets short month strings. For example: "Jan", "Feb", etc.
462 * @param newShortMonths the new short month strings. The array should
463 * be indexed by {@link java.util.Calendar#JANUARY Calendar.JANUARY},
464 * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY}, etc.
465 */
466 public void setShortMonths(String[] newShortMonths) {
467 shortMonths = Arrays.copyOf(newShortMonths, newShortMonths.length);
468 cachedHashCode = 0;
469 }
470
471 /**
472 * Gets weekday strings. For example: "Sunday", "Monday", etc.
473 * @return the weekday strings. Use
474 * {@link java.util.Calendar#SUNDAY Calendar.SUNDAY},
475 * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, etc. to index
476 * the result array.
477 */
478 public String[] getWeekdays() {
479 return Arrays.copyOf(weekdays, weekdays.length);
480 }
481
482 /**
483 * Sets weekday strings. For example: "Sunday", "Monday", etc.
484 * @param newWeekdays the new weekday strings. The array should
485 * be indexed by {@link java.util.Calendar#SUNDAY Calendar.SUNDAY},
486 * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, etc.
487 */
488 public void setWeekdays(String[] newWeekdays) {
489 weekdays = Arrays.copyOf(newWeekdays, newWeekdays.length);
490 cachedHashCode = 0;
491 }
492
493 /**
494 * Gets short weekday strings. For example: "Sun", "Mon", etc.
495 * @return the short weekday strings. Use
496 * {@link java.util.Calendar#SUNDAY Calendar.SUNDAY},
497 * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, etc. to index
498 * the result array.
499 */
500 public String[] getShortWeekdays() {
501 return Arrays.copyOf(shortWeekdays, shortWeekdays.length);
502 }
503
504 /**
505 * Sets short weekday strings. For example: "Sun", "Mon", etc.
506 * @param newShortWeekdays the new short weekday strings. The array should
507 * be indexed by {@link java.util.Calendar#SUNDAY Calendar.SUNDAY},
508 * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, etc.
509 */
510 public void setShortWeekdays(String[] newShortWeekdays) {
511 shortWeekdays = Arrays.copyOf(newShortWeekdays, newShortWeekdays.length);
512 cachedHashCode = 0;
513 }
514
515 /**
516 * Gets ampm strings. For example: "AM" and "PM".
517 * @return the ampm strings.
518 */
519 public String[] getAmPmStrings() {
520 return Arrays.copyOf(ampms, ampms.length);
521 }
522
523 /**
524 * Sets ampm strings. For example: "AM" and "PM".
525 * @param newAmpms the new ampm strings.
526 */
527 public void setAmPmStrings(String[] newAmpms) {
528 ampms = Arrays.copyOf(newAmpms, newAmpms.length);
529 cachedHashCode = 0;
530 }
531
532 /**
533 * Gets time zone strings. Use of this method is discouraged; use
534 * {@link java.util.TimeZone#getDisplayName() TimeZone.getDisplayName()}
535 * instead.
536 * <p>
537 * The value returned is a
538 * two-dimensional array of strings of size <em>n</em> by <em>m</em>,
539 * where <em>m</em> is at least 5. Each of the <em>n</em> rows is an
540 * entry containing the localized names for a single <code>TimeZone</code>.
541 * Each such row contains (with <code>i</code> ranging from
542 * 0..<em>n</em>-1):
543 * <ul>
544 * <li><code>zoneStrings[i][0]</code> - time zone ID</li>
545 * <li><code>zoneStrings[i][1]</code> - long name of zone in standard
546 * time</li>
547 * <li><code>zoneStrings[i][2]</code> - short name of zone in
548 * standard time</li>
549 * <li><code>zoneStrings[i][3]</code> - long name of zone in daylight
550 * saving time</li>
551 * <li><code>zoneStrings[i][4]</code> - short name of zone in daylight
552 * saving time</li>
553 * </ul>
554 * The zone ID is <em>not</em> localized; it's one of the valid IDs of
555 * the {@link java.util.TimeZone TimeZone} class that are not
556 * <a href="../util/TimeZone.html#CustomID">custom IDs</a>.
557 * All other entries are localized names. If a zone does not implement
558 * daylight saving time, the daylight saving time names should not be used.
559 * <p>
560 * If {@link #setZoneStrings(String[][]) setZoneStrings} has been called
561 * on this <code>DateFormatSymbols</code> instance, then the strings
562 * provided by that call are returned. Otherwise, the returned array
563 * contains names provided by the Java runtime and by installed
564 * {@link java.util.spi.TimeZoneNameProvider TimeZoneNameProvider}
565 * implementations.
566 *
567 * @return the time zone strings.
568 * @see #setZoneStrings(String[][])
569 */
570 public String[][] getZoneStrings() {
571 return getZoneStringsImpl(true);
572 }
573
574 /**
575 * Sets time zone strings. The argument must be a
576 * two-dimensional array of strings of size <em>n</em> by <em>m</em>,
577 * where <em>m</em> is at least 5. Each of the <em>n</em> rows is an
578 * entry containing the localized names for a single <code>TimeZone</code>.
579 * Each such row contains (with <code>i</code> ranging from
580 * 0..<em>n</em>-1):
581 * <ul>
582 * <li><code>zoneStrings[i][0]</code> - time zone ID</li>
583 * <li><code>zoneStrings[i][1]</code> - long name of zone in standard
584 * time</li>
585 * <li><code>zoneStrings[i][2]</code> - short name of zone in
586 * standard time</li>
587 * <li><code>zoneStrings[i][3]</code> - long name of zone in daylight
588 * saving time</li>
589 * <li><code>zoneStrings[i][4]</code> - short name of zone in daylight
590 * saving time</li>
591 * </ul>
592 * The zone ID is <em>not</em> localized; it's one of the valid IDs of
593 * the {@link java.util.TimeZone TimeZone} class that are not
594 * <a href="../util/TimeZone.html#CustomID">custom IDs</a>.
595 * All other entries are localized names.
596 *
597 * @param newZoneStrings the new time zone strings.
598 * @exception IllegalArgumentException if the length of any row in
599 * <code>newZoneStrings</code> is less than 5
600 * @exception NullPointerException if <code>newZoneStrings</code> is null
601 * @see #getZoneStrings()
602 */
603 public void setZoneStrings(String[][] newZoneStrings) {
604 String[][] aCopy = new String[newZoneStrings.length][];
605 for (int i = 0; i < newZoneStrings.length; ++i) {
606 int len = newZoneStrings[i].length;
607 if (len < 5) {
608 throw new IllegalArgumentException();
609 }
610 aCopy[i] = Arrays.copyOf(newZoneStrings[i], len);
611 }
612 zoneStrings = aCopy;
613 isZoneStringsSet = true;
614 cachedHashCode = 0;
615 }
616
617 /**
618 * Gets localized date-time pattern characters. For example: 'u', 't', etc.
619 * @return the localized date-time pattern characters.
620 */
621 public String getLocalPatternChars() {
622 return localPatternChars;
623 }
624
625 /**
626 * Sets localized date-time pattern characters. For example: 'u', 't', etc.
627 * @param newLocalPatternChars the new localized date-time
628 * pattern characters.
629 */
630 public void setLocalPatternChars(String newLocalPatternChars) {
631 // Call toString() to throw an NPE in case the argument is null
632 localPatternChars = newLocalPatternChars.toString();
633 cachedHashCode = 0;
634 }
635
636 /**
637 * Overrides Cloneable
638 */
639 public Object clone()
640 {
641 try
642 {
643 DateFormatSymbols other = (DateFormatSymbols)super.clone();
644 copyMembers(this, other);
645 return other;
646 } catch (CloneNotSupportedException e) {
647 throw new InternalError(e);
648 }
649 }
650
651 /**
652 * Override hashCode.
653 * Generates a hash code for the DateFormatSymbols object.
654 */
655 @Override
656 public int hashCode() {
657 int hashCode = cachedHashCode;
658 if (hashCode == 0) {
659 hashCode = 5;
660 hashCode = 11 * hashCode + Arrays.hashCode(eras);
661 hashCode = 11 * hashCode + Arrays.hashCode(months);
662 hashCode = 11 * hashCode + Arrays.hashCode(shortMonths);
663 hashCode = 11 * hashCode + Arrays.hashCode(weekdays);
664 hashCode = 11 * hashCode + Arrays.hashCode(shortWeekdays);
665 hashCode = 11 * hashCode + Arrays.hashCode(ampms);
666 hashCode = 11 * hashCode + Arrays.deepHashCode(getZoneStringsWrapper());
667 hashCode = 11 * hashCode + Objects.hashCode(localPatternChars);
668 if (hashCode != 0) {
669 cachedHashCode = hashCode;
670 }
671 }
672
673 return hashCode;
674 }
675
676 /**
677 * Override equals
678 */
679 public boolean equals(Object obj)
680 {
681 if (this == obj) return true;
682 if (obj == null || getClass() != obj.getClass()) return false;
683 DateFormatSymbols that = (DateFormatSymbols) obj;
684 return (Arrays.equals(eras, that.eras)
685 && Arrays.equals(months, that.months)
686 && Arrays.equals(shortMonths, that.shortMonths)
687 && Arrays.equals(weekdays, that.weekdays)
688 && Arrays.equals(shortWeekdays, that.shortWeekdays)
689 && Arrays.equals(ampms, that.ampms)
690 && Arrays.deepEquals(getZoneStringsWrapper(), that.getZoneStringsWrapper())
691 && ((localPatternChars != null
692 && localPatternChars.equals(that.localPatternChars))
693 || (localPatternChars == null
694 && that.localPatternChars == null)));
695 }
696
697 // =======================privates===============================
698
699 /**
700 * Useful constant for defining time zone offsets.
701 */
702 static final int millisPerHour = 60*60*1000;
703
704 /**
705 * Cache to hold DateFormatSymbols instances per Locale.
706 */
707 private static final ConcurrentMap<Locale, SoftReference<DateFormatSymbols>> cachedInstances
708 = new ConcurrentHashMap<>(3);
709
710 private transient int lastZoneIndex;
711
712 /**
713 * Cached hash code
714 */
715 transient volatile int cachedHashCode;
716
717 /**
718 * Initializes this DateFormatSymbols with the locale data. This method uses
719 * a cached DateFormatSymbols instance for the given locale if available. If
720 * there's no cached one, this method creates an uninitialized instance and
721 * populates its fields from the resource bundle for the locale, and caches
722 * the instance. Note: zoneStrings isn't initialized in this method.
723 */
724 private void initializeData(Locale locale) {
725 SoftReference<DateFormatSymbols> ref = cachedInstances.get(locale);
726 DateFormatSymbols dfs;
727 if (ref == null || (dfs = ref.get()) == null) {
728 if (ref != null) {
729 // Remove the empty SoftReference
730 cachedInstances.remove(locale, ref);
731 }
732 dfs = new DateFormatSymbols(false);
733
734 // check for region override
735 Locale override = CalendarDataUtility.findRegionOverride(locale);
736
737 // Initialize the fields from the ResourceBundle for locale.
738 LocaleProviderAdapter adapter
739 = LocaleProviderAdapter.getAdapter(DateFormatSymbolsProvider.class, override);
740 // Avoid any potential recursions
741 if (!(adapter instanceof ResourceBundleBasedAdapter)) {
742 adapter = LocaleProviderAdapter.getResourceBundleBased();
743 }
744 ResourceBundle resource
745 = ((ResourceBundleBasedAdapter)adapter).getLocaleData().getDateFormatData(override);
746
747 dfs.locale = locale;
748 // JRE and CLDR use different keys
749 // JRE: Eras, short.Eras and narrow.Eras
750 // CLDR: long.Eras, Eras and narrow.Eras
751 if (resource.containsKey("Eras")) {
752 dfs.eras = resource.getStringArray("Eras");
753 } else if (resource.containsKey("long.Eras")) {
754 dfs.eras = resource.getStringArray("long.Eras");
755 } else if (resource.containsKey("short.Eras")) {
756 dfs.eras = resource.getStringArray("short.Eras");
757 }
758 dfs.months = resource.getStringArray("MonthNames");
759 dfs.shortMonths = resource.getStringArray("MonthAbbreviations");
760 dfs.ampms = resource.getStringArray("AmPmMarkers");
761 dfs.localPatternChars = resource.getString("DateTimePatternChars");
762
763 // Day of week names are stored in a 1-based array.
764 dfs.weekdays = toOneBasedArray(resource.getStringArray("DayNames"));
765 dfs.shortWeekdays = toOneBasedArray(resource.getStringArray("DayAbbreviations"));
766
767 // Put dfs in the cache
768 ref = new SoftReference<>(dfs);
769 SoftReference<DateFormatSymbols> x = cachedInstances.putIfAbsent(locale, ref);
770 if (x != null) {
771 DateFormatSymbols y = x.get();
772 if (y == null) {
773 // Replace the empty SoftReference with ref.
774 cachedInstances.replace(locale, x, ref);
775 } else {
776 ref = x;
777 dfs = y;
778 }
779 }
780 }
781
782 // Copy the field values from dfs to this instance.
783 copyMembers(dfs, this);
784 }
785
786 private static String[] toOneBasedArray(String[] src) {
787 int len = src.length;
788 String[] dst = new String[len + 1];
789 dst[0] = "";
790 for (int i = 0; i < len; i++) {
791 dst[i + 1] = src[i];
792 }
793 return dst;
794 }
795
796 /**
797 * Package private: used by SimpleDateFormat
798 * Gets the index for the given time zone ID to obtain the time zone
799 * strings for formatting. The time zone ID is just for programmatic
800 * lookup. NOT LOCALIZED!!!
801 * @param ID the given time zone ID.
802 * @return the index of the given time zone ID. Returns -1 if
803 * the given time zone ID can't be located in the DateFormatSymbols object.
804 * @see java.util.SimpleTimeZone
805 */
806 final int getZoneIndex(String ID) {
807 String[][] zoneStrings = getZoneStringsWrapper();
808
809 /*
810 * getZoneIndex has been re-written for performance reasons. instead of
811 * traversing the zoneStrings array every time, we cache the last used zone
812 * index
813 */
814 if (lastZoneIndex < zoneStrings.length && ID.equals(zoneStrings[lastZoneIndex][0])) {
815 return lastZoneIndex;
816 }
817
818 /* slow path, search entire list */
819 for (int index = 0; index < zoneStrings.length; index++) {
820 if (ID.equals(zoneStrings[index][0])) {
821 lastZoneIndex = index;
822 return index;
823 }
824 }
825
826 return -1;
827 }
828
829 /**
830 * Wrapper method to the getZoneStrings(), which is called from inside
831 * the java.text package and not to mutate the returned arrays, so that
832 * it does not need to create a defensive copy.
833 */
834 final String[][] getZoneStringsWrapper() {
835 if (isSubclassObject()) {
836 return getZoneStrings();
837 } else {
838 return getZoneStringsImpl(false);
839 }
840 }
841
842 private String[][] getZoneStringsImpl(boolean needsCopy) {
843 if (zoneStrings == null) {
844 zoneStrings = TimeZoneNameUtility.getZoneStrings(locale);
845 }
846
847 if (!needsCopy) {
848 return zoneStrings;
849 }
850
851 int len = zoneStrings.length;
852 String[][] aCopy = new String[len][];
853 for (int i = 0; i < len; i++) {
854 aCopy[i] = Arrays.copyOf(zoneStrings[i], zoneStrings[i].length);
855 }
856 return aCopy;
857 }
858
859 private boolean isSubclassObject() {
860 return !getClass().getName().equals("java.text.DateFormatSymbols");
861 }
862
863 /**
864 * Clones all the data members from the source DateFormatSymbols to
865 * the target DateFormatSymbols.
866 *
867 * @param src the source DateFormatSymbols.
868 * @param dst the target DateFormatSymbols.
869 */
870 private void copyMembers(DateFormatSymbols src, DateFormatSymbols dst)
871 {
872 dst.locale = src.locale;
873 dst.eras = Arrays.copyOf(src.eras, src.eras.length);
874 dst.months = Arrays.copyOf(src.months, src.months.length);
875 dst.shortMonths = Arrays.copyOf(src.shortMonths, src.shortMonths.length);
876 dst.weekdays = Arrays.copyOf(src.weekdays, src.weekdays.length);
877 dst.shortWeekdays = Arrays.copyOf(src.shortWeekdays, src.shortWeekdays.length);
878 dst.ampms = Arrays.copyOf(src.ampms, src.ampms.length);
879 if (src.zoneStrings != null) {
880 dst.zoneStrings = src.getZoneStringsImpl(true);
881 } else {
882 dst.zoneStrings = null;
883 }
884 dst.localPatternChars = src.localPatternChars;
885 dst.cachedHashCode = 0;
886 }
887
888 /**
889 * Write out the default serializable data, after ensuring the
890 * <code>zoneStrings</code> field is initialized in order to make
891 * sure the backward compatibility.
892 *
893 * @since 1.6
894 */
895 private void writeObject(ObjectOutputStream stream) throws IOException {
896 if (zoneStrings == null) {
897 zoneStrings = TimeZoneNameUtility.getZoneStrings(locale);
898 }
899 stream.defaultWriteObject();
900 }
901 }
902