1 /*
2 * Copyright (c) 2000, 2012, 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 package sun.util;
27
28 import java.io.IOException;
29 import java.io.ObjectInputStream;
30 import java.util.GregorianCalendar;
31 import java.util.Locale;
32 import java.util.Map;
33 import java.util.TimeZone;
34 import sun.util.locale.provider.CalendarDataUtility;
35
36 public class BuddhistCalendar extends GregorianCalendar {
37
38 //////////////////
39 // Class Variables
40 //////////////////
41
42 @java.io.Serial
43 private static final long serialVersionUID = -8527488697350388578L;
44
45 private static final int BUDDHIST_YEAR_OFFSET = 543;
46
47 ///////////////
48 // Constructors
49 ///////////////
50
51 /**
52 * Constructs a default BuddhistCalendar using the current time
53 * in the default time zone with the default locale.
54 */
55 public BuddhistCalendar() {
56 super();
57 }
58
59 /**
60 * Constructs a BuddhistCalendar based on the current time
61 * in the given time zone with the default locale.
62 * @param zone the given time zone.
63 */
64 public BuddhistCalendar(TimeZone zone) {
65 super(zone);
66 }
67
68 /**
69 * Constructs a BuddhistCalendar based on the current time
70 * in the default time zone with the given locale.
71 * @param aLocale the given locale.
72 */
73 public BuddhistCalendar(Locale aLocale) {
74 super(aLocale);
75 }
76
77 /**
78 * Constructs a BuddhistCalendar based on the current time
79 * in the given time zone with the given locale.
80 * @param zone the given time zone.
81 * @param aLocale the given locale.
82 */
83 public BuddhistCalendar(TimeZone zone, Locale aLocale) {
84 super(zone, aLocale);
85 }
86
87 /////////////////
88 // Public methods
89 /////////////////
90
91 /**
92 * Returns {@code "buddhist"} as the calendar type of this Calendar.
93 */
94 @Override
95 public String getCalendarType() {
96 return "buddhist";
97 }
98
99 /**
100 * Compares this BuddhistCalendar to an object reference.
101 * @param obj the object reference with which to compare
102 * @return true if this object is equal to <code>obj</code>; false otherwise
103 */
104 @Override
105 public boolean equals(Object obj) {
106 return obj instanceof BuddhistCalendar
107 && super.equals(obj);
108 }
109
110 /**
111 * Override hashCode.
112 * Generates the hash code for the BuddhistCalendar object
113 */
114 @Override
115 public int hashCode() {
116 return super.hashCode() ^ BUDDHIST_YEAR_OFFSET;
117 }
118
119 /**
120 * Gets the value for a given time field.
121 * @param field the given time field.
122 * @return the value for the given time field.
123 */
124 @Override
125 public int get(int field)
126 {
127 if (field == YEAR) {
128 return super.get(field) + yearOffset;
129 }
130 return super.get(field);
131 }
132
133 /**
134 * Sets the time field with the given value.
135 * @param field the given time field.
136 * @param value the value to be set for the given time field.
137 */
138 @Override
139 public void set(int field, int value)
140 {
141 if (field == YEAR) {
142 super.set(field, value - yearOffset);
143 } else {
144 super.set(field, value);
145 }
146 }
147
148 /**
149 * Adds the specified (signed) amount of time to the given time field.
150 * @param field the time field.
151 * @param amount the amount of date or time to be added to the field.
152 */
153 @Override
154 public void add(int field, int amount)
155 {
156 int savedYearOffset = yearOffset;
157 // To let the superclass calculate date-time values correctly,
158 // temporarily make this GregorianCalendar.
159 yearOffset = 0;
160 try {
161 super.add(field, amount);
162 } finally {
163 yearOffset = savedYearOffset;
164 }
165 }
166
167 /**
168 * Add to field a signed amount without changing larger fields.
169 * A negative roll amount means to subtract from field without changing
170 * larger fields.
171 * @param field the time field.
172 * @param amount the signed amount to add to <code>field</code>.
173 */
174 @Override
175 public void roll(int field, int amount)
176 {
177 int savedYearOffset = yearOffset;
178 // To let the superclass calculate date-time values correctly,
179 // temporarily make this GregorianCalendar.
180 yearOffset = 0;
181 try {
182 super.roll(field, amount);
183 } finally {
184 yearOffset = savedYearOffset;
185 }
186 }
187
188 @Override
189 public String getDisplayName(int field, int style, Locale locale) {
190 if (field != ERA) {
191 return super.getDisplayName(field, style, locale);
192 }
193
194 return CalendarDataUtility.retrieveFieldValueName("buddhist", field, get(field), style, locale);
195 }
196
197 @Override
198 public Map<String,Integer> getDisplayNames(int field, int style, Locale locale) {
199 if (field != ERA) {
200 return super.getDisplayNames(field, style, locale);
201 }
202 return CalendarDataUtility.retrieveFieldValueNames("buddhist", field, style, locale);
203 }
204
205 /**
206 * Returns the maximum value that this field could have, given the
207 * current date. For example, with the date "Feb 3, 2540" and the
208 * <code>DAY_OF_MONTH</code> field, the actual maximum is 28; for
209 * "Feb 3, 2539" it is 29.
210 *
211 * @param field the field to determine the maximum of
212 * @return the maximum of the given field for the current date of this Calendar
213 */
214 @Override
215 public int getActualMaximum(int field) {
216 int savedYearOffset = yearOffset;
217 // To let the superclass calculate date-time values correctly,
218 // temporarily make this GregorianCalendar.
219 yearOffset = 0;
220 try {
221 return super.getActualMaximum(field);
222 } finally {
223 yearOffset = savedYearOffset;
224 }
225 }
226
227 @Override
228 @SuppressWarnings("empty-statement")
229 public String toString() {
230 // The super class produces a String with the Gregorian year
231 // value (or '?')
232 String s = super.toString();
233 // If the YEAR field is UNSET, then return the Gregorian string.
234 if (!isSet(YEAR)) {
235 return s;
236 }
237
238 final String yearField = "YEAR=";
239 int p = s.indexOf(yearField);
240 // If the string doesn't include the year value for some
241 // reason, then return the Gregorian string.
242 if (p == -1) {
243 return s;
244 }
245 p += yearField.length();
246 StringBuilder sb = new StringBuilder(s.length() + 10);
247 sb.append(s, 0, p);
248 // Skip the year number
249 while (Character.isDigit(s.charAt(p++)))
250 ;
251 int year = internalGet(YEAR) + BUDDHIST_YEAR_OFFSET;
252 sb.append(year).append(s, p - 1, s.length());
253 return sb.toString();
254 }
255
256 private transient int yearOffset = BUDDHIST_YEAR_OFFSET;
257
258 @java.io.Serial
259 private void readObject(ObjectInputStream stream)
260 throws IOException, ClassNotFoundException {
261 stream.defaultReadObject();
262 yearOffset = BUDDHIST_YEAR_OFFSET;
263 }
264 }