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
26package sun.util;
27
28import java.io.IOException;
29import java.io.ObjectInputStream;
30import java.util.GregorianCalendar;
31import java.util.Locale;
32import java.util.Map;
33import java.util.TimeZone;
34import sun.util.locale.provider.CalendarDataUtility;
35
36public 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    @Override
104    public boolean equals(Object obj) {
105        return obj instanceof BuddhistCalendar
106            && super.equals(obj);
107    }
108
109    /**
110     * Override hashCode.
111     * Generates the hash code for the BuddhistCalendar object
112     */
113    @Override
114    public int hashCode() {
115        return super.hashCode() ^ BUDDHIST_YEAR_OFFSET;
116    }
117
118    /**
119     * Gets the value for a given time field.
120     * @param field the given time field.
121     * @return the value for the given time field.
122     */
123    @Override
124    public int get(int field)
125    {
126        if (field == YEAR) {
127            return super.get(field) + yearOffset;
128        }
129        return super.get(field);
130    }
131
132    /**
133     * Sets the time field with the given value.
134     * @param field the given time field.
135     * @param value the value to be set for the given time field.
136     */
137    @Override
138    public void set(int field, int value)
139    {
140        if (field == YEAR) {
141            super.set(field, value - yearOffset);
142        } else {
143            super.set(field, value);
144        }
145    }
146
147    /**
148     * Adds the specified (signed) amount of time to the given time field.
149     * @param field the time field.
150     * @param amount the amount of date or time to be added to the field.
151     */
152    @Override
153    public void add(int field, int amount)
154    {
155        int savedYearOffset = yearOffset;
156        // To let the superclass calculate date-time values correctly,
157        // temporarily make this GregorianCalendar.
158        yearOffset = 0;
159        try {
160            super.add(field, amount);
161        } finally {
162            yearOffset = savedYearOffset;
163        }
164    }
165
166    /**
167     * Add to field a signed amount without changing larger fields.
168     * A negative roll amount means to subtract from field without changing
169     * larger fields.
170     * @param field the time field.
171     * @param amount the signed amount to add to <code>field</code>.
172     */
173    @Override
174    public void roll(int field, int amount)
175    {
176        int savedYearOffset = yearOffset;
177        // To let the superclass calculate date-time values correctly,
178        // temporarily make this GregorianCalendar.
179        yearOffset = 0;
180        try {
181            super.roll(field, amount);
182        } finally {
183            yearOffset = savedYearOffset;
184        }
185    }
186
187    @Override
188    public String getDisplayName(int field, int style, Locale locale) {
189        if (field != ERA) {
190            return super.getDisplayName(field, style, locale);
191        }
192
193        return CalendarDataUtility.retrieveFieldValueName("buddhist", field, get(field), style, locale);
194    }
195
196    @Override
197    public Map<String,Integer> getDisplayNames(int field, int style, Locale locale) {
198        if (field != ERA) {
199            return super.getDisplayNames(field, style, locale);
200        }
201        return CalendarDataUtility.retrieveFieldValueNames("buddhist", field, style, locale);
202    }
203
204    /**
205     * Returns the maximum value that this field could have, given the
206     * current date.  For example, with the date "Feb 3, 2540" and the
207     * <code>DAY_OF_MONTH</code> field, the actual maximum is 28; for
208     * "Feb 3, 2539" it is 29.
209     *
210     * @param field the field to determine the maximum of
211     * @return the maximum of the given field for the current date of this Calendar
212     */
213    @Override
214    public int getActualMaximum(int field) {
215        int savedYearOffset = yearOffset;
216        // To let the superclass calculate date-time values correctly,
217        // temporarily make this GregorianCalendar.
218        yearOffset = 0;
219        try {
220            return super.getActualMaximum(field);
221        } finally {
222            yearOffset = savedYearOffset;
223        }
224    }
225
226    @Override
227    @SuppressWarnings("empty-statement")
228    public String toString() {
229        // The super class produces a String with the Gregorian year
230        // value (or '?')
231        String s = super.toString();
232        // If the YEAR field is UNSET, then return the Gregorian string.
233        if (!isSet(YEAR)) {
234            return s;
235        }
236
237        final String yearField = "YEAR=";
238        int p = s.indexOf(yearField);
239        // If the string doesn't include the year value for some
240        // reason, then return the Gregorian string.
241        if (p == -1) {
242            return s;
243        }
244        p += yearField.length();
245        StringBuilder sb = new StringBuilder(s.length() + 10);
246        sb.append(s, 0, p);
247        // Skip the year number
248        while (Character.isDigit(s.charAt(p++)))
249            ;
250        int year = internalGet(YEAR) + BUDDHIST_YEAR_OFFSET;
251        sb.append(year).append(s, p - 1, s.length());
252        return sb.toString();
253    }
254
255    private transient int yearOffset = BUDDHIST_YEAR_OFFSET;
256
257    private void readObject(ObjectInputStream stream)
258        throws IOException, ClassNotFoundException {
259        stream.defaultReadObject();
260        yearOffset = BUDDHIST_YEAR_OFFSET;
261    }
262}
263