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.chrono;
58
59 import static java.time.temporal.ChronoField.YEAR;
60
61 import java.io.Serializable;
62 import java.time.Clock;
63 import java.time.DateTimeException;
64 import java.time.Instant;
65 import java.time.LocalDate;
66 import java.time.ZoneId;
67 import java.time.temporal.ChronoField;
68 import java.time.temporal.TemporalAccessor;
69 import java.time.temporal.ValueRange;
70 import java.util.Arrays;
71 import java.util.List;
72 import java.util.Locale;
73
74 /**
75 * The Minguo calendar system.
76 * <p>
77 * This chronology defines the rules of the Minguo calendar system.
78 * This calendar system is primarily used in the Republic of China, often known as Taiwan.
79 * Dates are aligned such that {@code 0001-01-01 (Minguo)} is {@code 1912-01-01 (ISO)}.
80 * <p>
81 * The fields are defined as follows:
82 * <p><ul>
83 * <li>era - There are two eras, the current 'Republic' (ERA_ROC) and the previous era (ERA_BEFORE_ROC).
84 * <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one.
85 * For the previous era the year increases from one as time goes backwards.
86 * The value for the current era is equal to the ISO proleptic-year minus 1911.
87 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the
88 * current era. For the previous era, years have zero, then negative values.
89 * The value is equal to the ISO proleptic-year minus 1911.
90 * <li>month-of-year - The Minguo month-of-year exactly matches ISO.
91 * <li>day-of-month - The Minguo day-of-month exactly matches ISO.
92 * <li>day-of-year - The Minguo day-of-year exactly matches ISO.
93 * <li>leap-year - The Minguo leap-year pattern exactly matches ISO, such that the two calendars
94 * are never out of step.
95 * </ul><p>
96 *
97 * <h3>Specification for implementors</h3>
98 * This class is immutable and thread-safe.
99 *
100 * @since 1.8
101 */
102 public final class MinguoChronology extends Chronology implements Serializable {
103
104 /**
105 * Singleton instance for the Minguo chronology.
106 */
107 public static final MinguoChronology INSTANCE = new MinguoChronology();
108
109 /**
110 * The singleton instance for the era ROC.
111 */
112 public static final Era ERA_ROC = MinguoEra.ROC;
113
114 /**
115 * The singleton instance for the era BEFORE_ROC.
116 */
117 public static final Era ERA_BEFORE_ROC = MinguoEra.BEFORE_ROC;
118
119 /**
120 * Serialization version.
121 */
122 private static final long serialVersionUID = 1039765215346859963L;
123 /**
124 * The difference in years between ISO and Minguo.
125 */
126 static final int YEARS_DIFFERENCE = 1911;
127
128 /**
129 * Restricted constructor.
130 */
131 private MinguoChronology() {
132 }
133
134 /**
135 * Resolve singleton.
136 *
137 * @return the singleton instance, not null
138 */
139 private Object readResolve() {
140 return INSTANCE;
141 }
142
143 //-----------------------------------------------------------------------
144 /**
145 * Gets the ID of the chronology - 'Minguo'.
146 * <p>
147 * The ID uniquely identifies the {@code Chronology}.
148 * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
149 *
150 * @return the chronology ID - 'Minguo'
151 * @see #getCalendarType()
152 */
153 @Override
154 public String getId() {
155 return "Minguo";
156 }
157
158 /**
159 * Gets the calendar type of the underlying calendar system - 'roc'.
160 * <p>
161 * The calendar type is an identifier defined by the
162 * <em>Unicode Locale Data Markup Language (LDML)</em> specification.
163 * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
164 * It can also be used as part of a locale, accessible via
165 * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
166 *
167 * @return the calendar system type - 'roc'
168 * @see #getId()
169 */
170 @Override
171 public String getCalendarType() {
172 return "roc";
173 }
174
175 //-----------------------------------------------------------------------
176 @Override
177 public MinguoDate date(int prolepticYear, int month, int dayOfMonth) {
178 return new MinguoDate(LocalDate.of(prolepticYear + YEARS_DIFFERENCE, month, dayOfMonth));
179 }
180
181 @Override
182 public MinguoDate dateYearDay(int prolepticYear, int dayOfYear) {
183 return new MinguoDate(LocalDate.ofYearDay(prolepticYear + YEARS_DIFFERENCE, dayOfYear));
184 }
185
186 @Override
187 public MinguoDate date(TemporalAccessor temporal) {
188 if (temporal instanceof MinguoDate) {
189 return (MinguoDate) temporal;
190 }
191 return new MinguoDate(LocalDate.from(temporal));
192 }
193 @Override
194 public MinguoDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
195 return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
196
197 }
198
199 @Override
200 public MinguoDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
201 return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
202 }
203
204 @Override
205 public MinguoDate dateNow() {
206 return dateNow(Clock.systemDefaultZone());
207 }
208
209 @Override
210 public MinguoDate dateNow(ZoneId zone) {
211 return dateNow(Clock.system(zone));
212 }
213
214 @Override
215 public MinguoDate dateNow(Clock clock) {
216 return date(LocalDate.now(clock));
217 }
218
219 @Override
220 public ChronoLocalDateTime<MinguoDate> localDateTime(TemporalAccessor temporal) {
221 return (ChronoLocalDateTime<MinguoDate>)super.localDateTime(temporal);
222 }
223
224 @Override
225 public ChronoZonedDateTime<MinguoDate> zonedDateTime(TemporalAccessor temporal) {
226 return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(temporal);
227 }
228
229 @Override
230 public ChronoZonedDateTime<MinguoDate> zonedDateTime(Instant instant, ZoneId zone) {
231 return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(instant, zone);
232 }
233
234 //-----------------------------------------------------------------------
235 /**
236 * Checks if the specified year is a leap year.
237 * <p>
238 * Minguo leap years occur exactly in line with ISO leap years.
239 * This method does not validate the year passed in, and only has a
240 * well-defined result for years in the supported range.
241 *
242 * @param prolepticYear the proleptic-year to check, not validated for range
243 * @return true if the year is a leap year
244 */
245 @Override
246 public boolean isLeapYear(long prolepticYear) {
247 return IsoChronology.INSTANCE.isLeapYear(prolepticYear + YEARS_DIFFERENCE);
248 }
249
250 @Override
251 public int prolepticYear(Era era, int yearOfEra) {
252 if (era instanceof MinguoEra == false) {
253 throw new DateTimeException("Era must be MinguoEra");
254 }
255 return (era == MinguoEra.ROC ? yearOfEra : 1 - yearOfEra);
256 }
257
258 @Override
259 public Era eraOf(int eraValue) {
260 return MinguoEra.of(eraValue);
261 }
262
263 @Override
264 public List<Era> eras() {
265 return Arrays.<Era>asList(MinguoEra.values());
266 }
267
268 //-----------------------------------------------------------------------
269 @Override
270 public ValueRange range(ChronoField field) {
271 switch (field) {
272 case YEAR_OF_ERA: {
273 ValueRange range = YEAR.range();
274 return ValueRange.of(1, range.getMaximum() - YEARS_DIFFERENCE, -range.getMinimum() + 1 + YEARS_DIFFERENCE);
275 }
276 case YEAR: {
277 ValueRange range = YEAR.range();
278 return ValueRange.of(range.getMinimum() - YEARS_DIFFERENCE, range.getMaximum() - YEARS_DIFFERENCE);
279 }
280 }
281 return field.range();
282 }
283
284 }