1 /*
2 * Copyright (c) 2000, 2011, 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 sun.util.locale.provider.CalendarDataUtility;
29 import java.io.IOException;
30 import java.io.ObjectInputStream;
31 import java.util.GregorianCalendar;
32 import java.util.Locale;
33 import java.util.Map;
34 import java.util.TimeZone;
35
36 public class BuddhistCalendar extends GregorianCalendar {
37
38 //////////////////
39 // Class Variables
40 //////////////////
41
42 private static final long serialVersionUID = -8527488697350388578L;
43
44 private static final int BUDDHIST_YEAR_OFFSET = 543;
45
46 ///////////////
47 // Constructors
48 ///////////////
49
50 /**
51 * Constructs a default BuddhistCalendar using the current time
52 * in the default time zone with the default locale.
53 */
54 public BuddhistCalendar() {
55 super();
56 }
57
58 /**
59 * Constructs a BuddhistCalendar based on the current time
60 * in the given time zone with the default locale.
61 * @param zone the given time zone.
62 */
63 public BuddhistCalendar(TimeZone zone) {
64 super(zone);
65 }
66
67 /**
68 * Constructs a BuddhistCalendar based on the current time
69 * in the default time zone with the given locale.
70 * @param aLocale the given locale.
71 */
72 public BuddhistCalendar(Locale aLocale) {
73 super(aLocale);
74 }
75
76 /**
77 * Constructs a BuddhistCalendar based on the current time
78 * in the given time zone with the given locale.
79 * @param zone the given time zone.
80 * @param aLocale the given locale.
81 */
82 public BuddhistCalendar(TimeZone zone, Locale aLocale) {
83 super(zone, aLocale);
84 }
85
86 /////////////////
87 // Public methods
88 /////////////////
89
90 /**
91 * Returns {@code "buddhist"} as the calendar type of this Calendar.
92 */
93 @Override
94 public String getCalendarType() {
95 return "buddhist";
96 }
97
98 /**
99 * Compares this BuddhistCalendar to an object reference.
100 * @param obj the object reference with which to compare
101 * @return true if this object is equal to <code>obj</code>; false otherwise
102 */
103 public boolean equals(Object obj) {
104 return obj instanceof BuddhistCalendar
105 && super.equals(obj);
106 }
107
108 /**
109 * Override hashCode.
110 * Generates the hash code for the BuddhistCalendar object
111 */
112 public int hashCode() {
113 return super.hashCode() ^ BUDDHIST_YEAR_OFFSET;
114 }
115
116 /**
117 * Gets the value for a given time field.
118 * @param field the given time field.
119 * @return the value for the given time field.
120 */
121 public int get(int field)
122 {
123 if (field == YEAR) {
124 return super.get(field) + yearOffset;
125 }
126 return super.get(field);
127 }
128
129 /**
130 * Sets the time field with the given value.
131 * @param field the given time field.
132 * @param value the value to be set for the given time field.
133 */
134 public void set(int field, int value)
135 {
136 if (field == YEAR) {
137 super.set(field, value - yearOffset);
138 } else {
139 super.set(field, value);
140 }
141 }
142
143 /**
144 * Adds the specified (signed) amount of time to the given time field.
145 * @param field the time field.
146 * @param amount the amount of date or time to be added to the field.
147 */
148 public void add(int field, int amount)
149 {
150 int savedYearOffset = yearOffset;
151 // To let the superclass calculate date-time values correctly,
152 // temporarily make this GregorianCalendar.
153 yearOffset = 0;
154 try {
155 super.add(field, amount);
156 } finally {
157 yearOffset = savedYearOffset;
158 }
159 }
160
161 /**
162 * Add to field a signed amount without changing larger fields.
163 * A negative roll amount means to subtract from field without changing
164 * larger fields.
165 * @param field the time field.
166 * @param amount the signed amount to add to <code>field</code>.
167 */
168 public void roll(int field, int amount)
169 {
170 int savedYearOffset = yearOffset;
171 // To let the superclass calculate date-time values correctly,
172 // temporarily make this GregorianCalendar.
173 yearOffset = 0;
174 try {
175 super.roll(field, amount);
176 } finally {
177 yearOffset = savedYearOffset;
178 }
179 }
180
181 public String getDisplayName(int field, int style, Locale locale) {
182 if (field != ERA) {
183 return super.getDisplayName(field, style, locale);
184 }
185
186 String name = CalendarDataUtility.retrieveFieldValueName("buddhist", field, get(field), style, locale);
187 return name;
188 }
189
190 public Map<String,Integer> getDisplayNames(int field, int style, Locale locale) {
191 if (field != ERA) {
192 return super.getDisplayNames(field, style, locale);
193 }
194 Map<String, Integer> names = CalendarDataUtility.retrieveFieldValueNames("buddhist", field, style, locale);
195 return names;
196 }
197
198 /**
199 * Returns the maximum value that this field could have, given the
200 * current date. For example, with the date "Feb 3, 2540" and the
201 * <code>DAY_OF_MONTH</code> field, the actual maximum is 28; for
202 * "Feb 3, 2539" it is 29.
203 *
204 * @param field the field to determine the maximum of
205 * @return the maximum of the given field for the current date of this Calendar
206 */
207 public int getActualMaximum(int field) {
208 int savedYearOffset = yearOffset;
209 // To let the superclass calculate date-time values correctly,
210 // temporarily make this GregorianCalendar.
211 yearOffset = 0;
212 try {
213 return super.getActualMaximum(field);
214 } finally {
215 yearOffset = savedYearOffset;
216 }
217 }
218
219 public String toString() {
220 // The super class produces a String with the Gregorian year
221 // value (or '?')
222 String s = super.toString();
223 // If the YEAR field is UNSET, then return the Gregorian string.
224 if (!isSet(YEAR)) {
225 return s;
226 }
227
228 final String yearField = "YEAR=";
229 int p = s.indexOf(yearField);
230 // If the string doesn't include the year value for some
231 // reason, then return the Gregorian string.
232 if (p == -1) {
233 return s;
234 }
235 p += yearField.length();
236 StringBuilder sb = new StringBuilder(s.substring(0, p));
237 // Skip the year number
238 while (Character.isDigit(s.charAt(p++)))
239 ;
240 int year = internalGet(YEAR) + BUDDHIST_YEAR_OFFSET;
241 sb.append(year).append(s.substring(p - 1));
242 return sb.toString();
243 }
244
245 private transient int yearOffset = BUDDHIST_YEAR_OFFSET;
246
247 private void readObject(ObjectInputStream stream)
248 throws IOException, ClassNotFoundException {
249 stream.defaultReadObject();
250 yearOffset = BUDDHIST_YEAR_OFFSET;
251 }
252 }