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 * Reiwa 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 */ Era(String name, String abbr, long since, boolean localTime)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 getName()93 public String getName() { 94 return name; 95 } 96 getDisplayName(Locale locale)97 public String getDisplayName(Locale locale) { 98 return name; 99 } 100 getAbbreviation()101 public String getAbbreviation() { 102 return abbr; 103 } 104 getDiaplayAbbreviation(Locale locale)105 public String getDiaplayAbbreviation(Locale locale) { 106 return abbr; 107 } 108 getSince(TimeZone zone)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 getSinceDate()117 public CalendarDate getSinceDate() { 118 return sinceDate; 119 } 120 isLocalTime()121 public boolean isLocalTime() { 122 return localTime; 123 } 124 equals(Object o)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 hashCode()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 toString()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 } 160