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
26 /*
27 * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
28 *
29 * All rights reserved.
30 *
31 * Redistribution and use in source and binary forms, with or without
32 * modification, are permitted provided that the following conditions are met:
33 *
34 * * Redistributions of source code must retain the above copyright notice,
35 * this list of conditions and the following disclaimer.
36 *
37 * * Redistributions in binary form must reproduce the above copyright notice,
38 * this list of conditions and the following disclaimer in the documentation
39 * and/or other materials provided with the distribution.
40 *
41 * * Neither the name of JSR-310 nor the names of its contributors
42 * may be used to endorse or promote products derived from this software
43 * without specific prior written permission.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
46 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
47 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
48 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
49 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
50 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
51 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
52 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
53 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
54 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
55 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56 */
57 package java.time.calendar;
58
59 import static java.time.temporal.ChronoField.YEAR;
60
61 import java.io.Serializable;
62 import java.time.DateTimeException;
63 import java.time.LocalDate;
64 import java.time.temporal.Chrono;
65 import java.time.temporal.ChronoField;
66 import java.time.temporal.ChronoLocalDate;
67 import java.time.temporal.Era;
68 import java.time.temporal.ISOChrono;
69 import java.time.temporal.TemporalAccessor;
70 import java.time.temporal.ValueRange;
71 import java.util.Arrays;
72 import java.util.HashMap;
73 import java.util.List;
74 import java.util.Locale;
75
76 /**
77 * The Thai Buddhist calendar system.
78 * <p>
79 * This chronology defines the rules of the Thai Buddhist calendar system.
80 * This calendar system is primarily used in Thailand.
81 * Dates are aligned such that {@code 2484-01-01 (Buddhist)} is {@code 1941-01-01 (ISO)}.
82 * <p>
83 * The fields are defined as follows:
84 * <p><ul>
85 * <li>era - There are two eras, the current 'Buddhist' (ERA_BE) and the previous era (ERA_BEFORE_BE).
86 * <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one.
87 * For the previous era the year increases from one as time goes backwards.
88 * The value for the current era is equal to the ISO proleptic-year plus 543.
89 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the
90 * current era. For the previous era, years have zero, then negative values.
91 * The value is equal to the ISO proleptic-year plus 543.
92 * <li>month-of-year - The ThaiBuddhist month-of-year exactly matches ISO.
93 * <li>day-of-month - The ThaiBuddhist day-of-month exactly matches ISO.
94 * <li>day-of-year - The ThaiBuddhist day-of-year exactly matches ISO.
95 * <li>leap-year - The ThaiBuddhist leap-year pattern exactly matches ISO, such that the two calendars
96 * are never out of step.
97 * </ul><p>
98 *
99 * <h3>Specification for implementors</h3>
100 * This class is immutable and thread-safe.
101 *
102 * @since 1.8
103 */
104 public final class ThaiBuddhistChrono extends Chrono<ThaiBuddhistChrono> implements Serializable {
105
106 /**
107 * Singleton instance of the Buddhist chronology.
108 */
109 public static final ThaiBuddhistChrono INSTANCE = new ThaiBuddhistChrono();
110 /**
111 * The singleton instance for the era before the current one - Before Buddhist -
112 * which has the value 0.
113 */
114 public static final Era<ThaiBuddhistChrono> ERA_BEFORE_BE = ThaiBuddhistEra.BEFORE_BE;
115 /**
116 * The singleton instance for the current era - Buddhist - which has the value 1.
117 */
118 public static final Era<ThaiBuddhistChrono> ERA_BE = ThaiBuddhistEra.BE;
119
120 /**
121 * Serialization version.
122 */
123 private static final long serialVersionUID = 2775954514031616474L;
124 /**
125 * Containing the offset to add to the ISO year.
126 */
127 static final int YEARS_DIFFERENCE = 543;
128 /**
129 * Narrow names for eras.
130 */
131 private static final HashMap<String, String[]> ERA_NARROW_NAMES = new HashMap<>();
132 /**
133 * Short names for eras.
134 */
135 private static final HashMap<String, String[]> ERA_SHORT_NAMES = new HashMap<>();
136 /**
137 * Full names for eras.
138 */
139 private static final HashMap<String, String[]> ERA_FULL_NAMES = new HashMap<>();
140 /**
141 * Fallback language for the era names.
142 */
143 private static final String FALLBACK_LANGUAGE = "en";
144 /**
145 * Language that has the era names.
146 */
147 private static final String TARGET_LANGUAGE = "th";
148 /**
149 * Name data.
150 */
151 static {
152 ERA_NARROW_NAMES.put(FALLBACK_LANGUAGE, new String[]{"BB", "BE"});
153 ERA_NARROW_NAMES.put(TARGET_LANGUAGE, new String[]{"BB", "BE"});
154 ERA_SHORT_NAMES.put(FALLBACK_LANGUAGE, new String[]{"B.B.", "B.E."});
155 ERA_SHORT_NAMES.put(TARGET_LANGUAGE,
156 new String[]{"\u0e1e.\u0e28.",
157 "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"});
158 ERA_FULL_NAMES.put(FALLBACK_LANGUAGE, new String[]{"Before Buddhist", "Budhhist Era"});
159 ERA_FULL_NAMES.put(TARGET_LANGUAGE,
160 new String[]{"\u0e1e\u0e38\u0e17\u0e18\u0e28\u0e31\u0e01\u0e23\u0e32\u0e0a",
161 "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"});
162 }
163
164 /**
165 * Restricted constructor.
166 */
167 private ThaiBuddhistChrono() {
168 }
169
170 /**
171 * Resolve singleton.
172 *
173 * @return the singleton instance, not null
174 */
175 private Object readResolve() {
176 return INSTANCE;
177 }
178
179 //-----------------------------------------------------------------------
180 /**
181 * Gets the ID of the chronology - 'ThaiBuddhist'.
182 * <p>
183 * The ID uniquely identifies the {@code Chrono}.
184 * It can be used to lookup the {@code Chrono} using {@link #of(String)}.
185 *
186 * @return the chronology ID - 'ThaiBuddhist'
187 * @see #getCalendarType()
188 */
189 @Override
190 public String getId() {
191 return "ThaiBuddhist";
192 }
193
194 /**
195 * Gets the calendar type of the underlying calendar system - 'buddhist'.
196 * <p>
197 * The calendar type is an identifier defined by the
198 * <em>Unicode Locale Data Markup Language (LDML)</em> specification.
199 * It can be used to lookup the {@code Chrono} using {@link #of(String)}.
200 * It can also be used as part of a locale, accessible via
201 * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
202 *
203 * @return the calendar system type - 'buddhist'
204 * @see #getId()
205 */
206 @Override
207 public String getCalendarType() {
208 return "buddhist";
209 }
210
211 //-----------------------------------------------------------------------
212 @Override
213 public ChronoLocalDate<ThaiBuddhistChrono> date(int prolepticYear, int month, int dayOfMonth) {
214 return new ThaiBuddhistDate(LocalDate.of(prolepticYear - YEARS_DIFFERENCE, month, dayOfMonth));
215 }
216
217 @Override
218 public ChronoLocalDate<ThaiBuddhistChrono> dateYearDay(int prolepticYear, int dayOfYear) {
219 return new ThaiBuddhistDate(LocalDate.ofYearDay(prolepticYear - YEARS_DIFFERENCE, dayOfYear));
220 }
221
222 @Override
223 public ChronoLocalDate<ThaiBuddhistChrono> date(TemporalAccessor temporal) {
224 if (temporal instanceof ThaiBuddhistDate) {
225 return (ThaiBuddhistDate) temporal;
226 }
227 return new ThaiBuddhistDate(LocalDate.from(temporal));
228 }
229
230 //-----------------------------------------------------------------------
231 /**
232 * Checks if the specified year is a leap year.
233 * <p>
234 * Thai Buddhist leap years occur exactly in line with ISO leap years.
235 * This method does not validate the year passed in, and only has a
236 * well-defined result for years in the supported range.
237 *
238 * @param prolepticYear the proleptic-year to check, not validated for range
239 * @return true if the year is a leap year
240 */
241 @Override
242 public boolean isLeapYear(long prolepticYear) {
243 return ISOChrono.INSTANCE.isLeapYear(prolepticYear - YEARS_DIFFERENCE);
244 }
245
246 @Override
247 public int prolepticYear(Era<ThaiBuddhistChrono> era, int yearOfEra) {
248 if (era instanceof ThaiBuddhistEra == false) {
249 throw new DateTimeException("Era must be BuddhistEra");
250 }
251 return (era == ThaiBuddhistEra.BE ? yearOfEra : 1 - yearOfEra);
252 }
253
254 @Override
255 public Era<ThaiBuddhistChrono> eraOf(int eraValue) {
256 return ThaiBuddhistEra.of(eraValue);
257 }
258
259 @Override
260 public List<Era<ThaiBuddhistChrono>> eras() {
261 return Arrays.<Era<ThaiBuddhistChrono>>asList(ThaiBuddhistEra.values());
262 }
263
264 //-----------------------------------------------------------------------
265 @Override
266 public ValueRange range(ChronoField field) {
267 switch (field) {
268 case YEAR_OF_ERA: {
269 ValueRange range = YEAR.range();
270 return ValueRange.of(1, -(range.getMinimum() + YEARS_DIFFERENCE) + 1, range.getMaximum() + YEARS_DIFFERENCE);
271 }
272 case YEAR: {
273 ValueRange range = YEAR.range();
274 return ValueRange.of(range.getMinimum() + YEARS_DIFFERENCE, range.getMaximum() + YEARS_DIFFERENCE);
275 }
276 }
277 return field.range();
278 }
279
280 }