| /* |
| * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * * Neither the name of JSR-310 nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package java.time.chrono; |
| |
| import static java.time.chrono.JapaneseDate.MEIJI_6_ISODATE; |
| import static java.time.temporal.ChronoField.ERA; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.InvalidObjectException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectStreamException; |
| import java.io.Serializable; |
| import java.time.DateTimeException; |
| import java.time.LocalDate; |
| import java.time.format.DateTimeFormatterBuilder; |
| import java.time.format.TextStyle; |
| import java.time.temporal.ChronoField; |
| import java.time.temporal.TemporalField; |
| import java.time.temporal.UnsupportedTemporalTypeException; |
| import java.time.temporal.ValueRange; |
| import java.util.Arrays; |
| import java.util.Locale; |
| import java.util.Objects; |
| |
| import sun.util.calendar.CalendarDate; |
| |
| /** |
| * An era in the Japanese Imperial calendar system. |
| * <p> |
| * This class defines the valid eras for the Japanese chronology. |
| * Japan introduced the Gregorian calendar starting with Meiji 6. |
| * Only Meiji and later eras are supported; |
| * dates before Meiji 6, January 1 are not supported. |
| * |
| * @implSpec |
| * This class is immutable and thread-safe. |
| * |
| * @since 1.8 |
| */ |
| public final class JapaneseEra |
| implements Era, Serializable { |
| |
| // The offset value to 0-based index from the era value. |
| // i.e., getValue() + ERA_OFFSET == 0-based index |
| static final int ERA_OFFSET = 2; |
| |
| static final sun.util.calendar.Era[] ERA_CONFIG; |
| |
| /** |
| * The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29) |
| * which has the value -1. |
| */ |
| public static final JapaneseEra MEIJI = new JapaneseEra(-1, LocalDate.of(1868, 1, 1)); |
| /** |
| * The singleton instance for the 'Taisho' era (1912-07-30 - 1926-12-24) |
| * which has the value 0. |
| */ |
| public static final JapaneseEra TAISHO = new JapaneseEra(0, LocalDate.of(1912, 7, 30)); |
| /** |
| * The singleton instance for the 'Showa' era (1926-12-25 - 1989-01-07) |
| * which has the value 1. |
| */ |
| public static final JapaneseEra SHOWA = new JapaneseEra(1, LocalDate.of(1926, 12, 25)); |
| /** |
| * The singleton instance for the 'Heisei' era (1989-01-08 - current) |
| * which has the value 2. |
| */ |
| public static final JapaneseEra HEISEI = new JapaneseEra(2, LocalDate.of(1989, 1, 8)); |
| |
| // The number of predefined JapaneseEra constants. |
| // There may be a supplemental era defined by the property. |
| private static final int N_ERA_CONSTANTS = HEISEI.getValue() + ERA_OFFSET; |
| |
| /** |
| * Serialization version. |
| */ |
| private static final long serialVersionUID = 1466499369062886794L; |
| |
| // array for the singleton JapaneseEra instances |
| private static final JapaneseEra[] KNOWN_ERAS; |
| |
| static { |
| ERA_CONFIG = JapaneseChronology.JCAL.getEras(); |
| |
| KNOWN_ERAS = new JapaneseEra[ERA_CONFIG.length]; |
| KNOWN_ERAS[0] = MEIJI; |
| KNOWN_ERAS[1] = TAISHO; |
| KNOWN_ERAS[2] = SHOWA; |
| KNOWN_ERAS[3] = HEISEI; |
| for (int i = N_ERA_CONSTANTS; i < ERA_CONFIG.length; i++) { |
| CalendarDate date = ERA_CONFIG[i].getSinceDate(); |
| LocalDate isoDate = LocalDate.of(date.getYear(), date.getMonth(), date.getDayOfMonth()); |
| KNOWN_ERAS[i] = new JapaneseEra(i - ERA_OFFSET + 1, isoDate); |
| } |
| }; |
| |
| /** |
| * The era value. |
| * @serial |
| */ |
| private final transient int eraValue; |
| |
| // the first day of the era |
| private final transient LocalDate since; |
| |
| /** |
| * Creates an instance. |
| * |
| * @param eraValue the era value, validated |
| * @param since the date representing the first date of the era, validated not null |
| */ |
| private JapaneseEra(int eraValue, LocalDate since) { |
| this.eraValue = eraValue; |
| this.since = since; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Returns the Sun private Era instance corresponding to this {@code JapaneseEra}. |
| * |
| * @return the Sun private Era instance for this {@code JapaneseEra}. |
| */ |
| sun.util.calendar.Era getPrivateEra() { |
| return ERA_CONFIG[ordinal(eraValue)]; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code JapaneseEra} from an {@code int} value. |
| * <p> |
| * The {@link #SHOWA} era that contains 1970-01-01 (ISO calendar system) has the value 1 |
| * Later era is numbered 2 ({@link #HEISEI}). Earlier eras are numbered 0 ({@link #TAISHO}), |
| * -1 ({@link #MEIJI}), only Meiji and later eras are supported. |
| * |
| * @param japaneseEra the era to represent |
| * @return the {@code JapaneseEra} singleton, not null |
| * @throws DateTimeException if the value is invalid |
| */ |
| public static JapaneseEra of(int japaneseEra) { |
| int i = ordinal(japaneseEra); |
| if (i < 0 || i >= KNOWN_ERAS.length) { |
| throw new DateTimeException("Invalid era: " + japaneseEra); |
| } |
| return KNOWN_ERAS[i]; |
| } |
| |
| /** |
| * Returns the {@code JapaneseEra} with the name. |
| * <p> |
| * The string must match exactly the name of the era. |
| * (Extraneous whitespace characters are not permitted.) |
| * |
| * @param japaneseEra the japaneseEra name; non-null |
| * @return the {@code JapaneseEra} singleton, never null |
| * @throws IllegalArgumentException if there is not JapaneseEra with the specified name |
| */ |
| public static JapaneseEra valueOf(String japaneseEra) { |
| Objects.requireNonNull(japaneseEra, "japaneseEra"); |
| for (JapaneseEra era : KNOWN_ERAS) { |
| if (era.getName().equals(japaneseEra)) { |
| return era; |
| } |
| } |
| throw new IllegalArgumentException("japaneseEra is invalid"); |
| } |
| |
| /** |
| * Returns an array of JapaneseEras. |
| * <p> |
| * This method may be used to iterate over the JapaneseEras as follows: |
| * <pre> |
| * for (JapaneseEra c : JapaneseEra.values()) |
| * System.out.println(c); |
| * </pre> |
| * |
| * @return an array of JapaneseEras |
| */ |
| public static JapaneseEra[] values() { |
| return Arrays.copyOf(KNOWN_ERAS, KNOWN_ERAS.length); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @param style {@inheritDoc} |
| * @param locale {@inheritDoc} |
| */ |
| @Override |
| public String getDisplayName(TextStyle style, Locale locale) { |
| // If this JapaneseEra is a supplemental one, obtain the name from |
| // the era definition. |
| if (getValue() > N_ERA_CONSTANTS - ERA_OFFSET) { |
| Objects.requireNonNull(locale, "locale"); |
| return style.asNormal() == TextStyle.NARROW ? getAbbreviation() : getName(); |
| } |
| |
| return new DateTimeFormatterBuilder() |
| .appendText(ERA, style) |
| .toFormatter(locale) |
| .withChronology(JapaneseChronology.INSTANCE) |
| .format(this == MEIJI ? MEIJI_6_ISODATE : since); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code JapaneseEra} from a date. |
| * |
| * @param date the date, not null |
| * @return the Era singleton, never null |
| */ |
| static JapaneseEra from(LocalDate date) { |
| if (date.isBefore(MEIJI_6_ISODATE)) { |
| throw new DateTimeException("JapaneseDate before Meiji 6 are not supported"); |
| } |
| for (int i = KNOWN_ERAS.length - 1; i > 0; i--) { |
| JapaneseEra era = KNOWN_ERAS[i]; |
| if (date.compareTo(era.since) >= 0) { |
| return era; |
| } |
| } |
| return null; |
| } |
| |
| static JapaneseEra toJapaneseEra(sun.util.calendar.Era privateEra) { |
| for (int i = ERA_CONFIG.length - 1; i >= 0; i--) { |
| if (ERA_CONFIG[i].equals(privateEra)) { |
| return KNOWN_ERAS[i]; |
| } |
| } |
| return null; |
| } |
| |
| static sun.util.calendar.Era privateEraFrom(LocalDate isoDate) { |
| for (int i = KNOWN_ERAS.length - 1; i > 0; i--) { |
| JapaneseEra era = KNOWN_ERAS[i]; |
| if (isoDate.compareTo(era.since) >= 0) { |
| return ERA_CONFIG[i]; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the index into the arrays from the Era value. |
| * the eraValue is a valid Era number, -1..2. |
| * |
| * @param eraValue the era value to convert to the index |
| * @return the index of the current Era |
| */ |
| private static int ordinal(int eraValue) { |
| return eraValue + ERA_OFFSET - 1; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Gets the numeric era {@code int} value. |
| * <p> |
| * The {@link #SHOWA} era that contains 1970-01-01 (ISO calendar system) has the value 1. |
| * Later eras are numbered from 2 ({@link #HEISEI}). |
| * Earlier eras are numbered 0 ({@link #TAISHO}), -1 ({@link #MEIJI})). |
| * |
| * @return the era value |
| */ |
| @Override |
| public int getValue() { |
| return eraValue; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Gets the range of valid values for the specified field. |
| * <p> |
| * The range object expresses the minimum and maximum valid values for a field. |
| * This era is used to enhance the accuracy of the returned range. |
| * If it is not possible to return the range, because the field is not supported |
| * or for some other reason, an exception is thrown. |
| * <p> |
| * If the field is a {@link ChronoField} then the query is implemented here. |
| * The {@code ERA} field returns the range. |
| * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. |
| * <p> |
| * If the field is not a {@code ChronoField}, then the result of this method |
| * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)} |
| * passing {@code this} as the argument. |
| * Whether the range can be obtained is determined by the field. |
| * <p> |
| * The range of valid Japanese eras can change over time due to the nature |
| * of the Japanese calendar system. |
| * |
| * @param field the field to query the range for, not null |
| * @return the range of valid values for the field, not null |
| * @throws DateTimeException if the range for the field cannot be obtained |
| * @throws UnsupportedTemporalTypeException if the unit is not supported |
| */ |
| @Override // override as super would return range from 0 to 1 |
| public ValueRange range(TemporalField field) { |
| if (field == ERA) { |
| return JapaneseChronology.INSTANCE.range(ERA); |
| } |
| return Era.super.range(field); |
| } |
| |
| //----------------------------------------------------------------------- |
| String getAbbreviation() { |
| return ERA_CONFIG[ordinal(getValue())].getAbbreviation(); |
| } |
| |
| String getName() { |
| return ERA_CONFIG[ordinal(getValue())].getName(); |
| } |
| |
| @Override |
| public String toString() { |
| return getName(); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Defend against malicious streams. |
| * |
| * @param s the stream to read |
| * @throws InvalidObjectException always |
| */ |
| private void readObject(ObjectInputStream s) throws InvalidObjectException { |
| throw new InvalidObjectException("Deserialization via serialization delegate"); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Writes the object using a |
| * <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>. |
| * @serialData |
| * <pre> |
| * out.writeByte(5); // identifies a JapaneseEra |
| * out.writeInt(getValue()); |
| * </pre> |
| * |
| * @return the instance of {@code Ser}, not null |
| */ |
| private Object writeReplace() { |
| return new Ser(Ser.JAPANESE_ERA_TYPE, this); |
| } |
| |
| void writeExternal(DataOutput out) throws IOException { |
| out.writeByte(this.getValue()); |
| } |
| |
| static JapaneseEra readExternal(DataInput in) throws IOException { |
| byte eraValue = in.readByte(); |
| return JapaneseEra.of(eraValue); |
| } |
| |
| } |