1 /*
2 * Copyright (c) 2003, 2019, 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.calendar;
27
28 import java.util.Locale;
29 import java.util.TimeZone;
30
31 /**
32 * The class <code>Era</code> represents a calendar era that defines a
33 * period of time in which the same year numbering is used. For
34 * example, Gregorian year 2004 is <I>Heisei</I> 16 in the Japanese
35 * calendar system. An era starts at any point of time (Gregorian) that is
36 * represented by <code>CalendarDate</code>.
37 *
38 * <p><code>Era</code>s that are applicable to a particular calendar
39 * system can be obtained by calling {@link CalendarSystem#getEras}
40 * one of which can be used to specify a date in
41 * <code>CalendarDate</code>.
42 *
43 * <p>The following era names are defined in this release.
44 * <!-- TODO: use HTML table -->
45 * <pre><tt>
46 * Calendar system Era name Since (in Gregorian)
47 * -----------------------------------------------------------------------
48 * Japanese calendar Meiji 1868-01-01 midnight local time
49 * Taisho 1912-07-30 midnight local time
50 * Showa 1926-12-26 midnight local time
51 * Heisei 1989-01-08 midnight local time
52 * NewEra 2019-05-01 midnight local time
53 * Julian calendar BeforeCommonEra -292275055-05-16T16:47:04.192Z
54 * CommonEra 0000-12-30 midnight local time
55 * Taiwanese calendar MinGuo 1911-01-01 midnight local time
56 * Thai Buddhist calendar BuddhistEra -543-01-01 midnight local time
57 * -----------------------------------------------------------------------
58 * </tt></pre>
59 *
60 * @author Masayoshi Okutsu
61 * @since 1.5
62 */
63
64 public final class Era {
65 private final String name;
66 private final String abbr;
67 private final long since;
68 private final CalendarDate sinceDate;
69 private final boolean localTime;
70
71 /**
72 * Constructs an <code>Era</code> instance.
73 *
74 * @param name the era name (e.g., "BeforeCommonEra" for the Julian calendar system)
75 * @param abbr the abbreviation of the era name (e.g., "B.C.E." for "BeforeCommonEra")
76 * @param since the time (millisecond offset from January 1, 1970
77 * (Gregorian) UTC or local time) when the era starts, inclusive.
78 * @param localTime <code>true</code> if <code>since</code>
79 * specifies a local time; <code>false</code> if
80 * <code>since</code> specifies UTC
81 */
82 public Era(String name, String abbr, long since, boolean localTime) {
83 this.name = name;
84 this.abbr = abbr;
85 this.since = since;
86 this.localTime = localTime;
87 Gregorian gcal = CalendarSystem.getGregorianCalendar();
88 BaseCalendar.Date d = (BaseCalendar.Date) gcal.newCalendarDate(null);
89 gcal.getCalendarDate(since, d);
90 sinceDate = new ImmutableGregorianDate(d);
91 }
92
93 public String getName() {
94 return name;
95 }
96
97 public String getDisplayName(Locale locale) {
98 return name;
99 }
100
101 public String getAbbreviation() {
102 return abbr;
103 }
104
105 public String getDiaplayAbbreviation(Locale locale) {
106 return abbr;
107 }
108
109 public long getSince(TimeZone zone) {
110 if (zone == null || !localTime) {
111 return since;
112 }
113 int offset = zone.getOffset(since);
114 return since - offset;
115 }
116
117 public CalendarDate getSinceDate() {
118 return sinceDate;
119 }
120
121 public boolean isLocalTime() {
122 return localTime;
123 }
124
125 public boolean equals(Object o) {
126 if (!(o instanceof Era)) {
127 return false;
128 }
129 Era that = (Era) o;
130 return name.equals(that.name)
131 && abbr.equals(that.abbr)
132 && since == that.since
133 && localTime == that.localTime;
134 }
135
136 private int hash = 0;
137
138 public int hashCode() {
139 if (hash == 0) {
140 hash = name.hashCode() ^ abbr.hashCode() ^ (int)since ^ (int)(since >> 32)
141 ^ (localTime ? 1 : 0);
142 }
143 return hash;
144 }
145
146 public String toString() {
147 StringBuilder sb = new StringBuilder();
148 sb.append('[');
149 sb.append(getName()).append(" (");
150 sb.append(getAbbreviation()).append(')');
151 sb.append(" since ").append(getSinceDate());
152 if (localTime) {
153 sb.setLength(sb.length() - 1); // remove 'Z'
154 sb.append(" local time");
155 }
156 sb.append(']');
157 return sb.toString();
158 }
159 }