71 import java.io.ObjectInputStream;
72 import java.io.ObjectStreamException;
73 import java.io.Serializable;
74 import java.time.DateTimeException;
75 import java.time.LocalDate;
76 import java.time.format.DateTimeFormatterBuilder;
77 import java.time.format.TextStyle;
78 import java.time.temporal.ChronoField;
79 import java.time.temporal.TemporalField;
80 import java.time.temporal.UnsupportedTemporalTypeException;
81 import java.time.temporal.ValueRange;
82 import java.util.Arrays;
83 import java.util.Locale;
84 import java.util.Objects;
85
86 import sun.util.calendar.CalendarDate;
87
88 /**
89 * An era in the Japanese Imperial calendar system.
90 * <p>
91 * This class defines the valid eras for the Japanese chronology.
92 * Japan introduced the Gregorian calendar starting with Meiji 6.
93 * Only Meiji and later eras are supported;
94 * dates before Meiji 6, January 1 are not supported.
95 * The number of the valid eras may increase, as new eras may be
96 * defined by the Japanese government. Once an era is defined,
97 * future versions of the platform may add a singleton instance
98 * for it. The defined era is expected to have a consecutive integer
99 * associated with it.
100 *
101 * @implSpec
102 * This class is immutable and thread-safe.
103 *
104 * @since 1.8
105 */
106 public final class JapaneseEra
107 implements Era, Serializable {
108
109 // The offset value to 0-based index from the era value.
110 // i.e., getValue() + ERA_OFFSET == 0-based index
111 static final int ERA_OFFSET = 2;
112
113 static final sun.util.calendar.Era[] ERA_CONFIG;
114
115 /**
116 * The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29)
117 * which has the value -1.
118 */
119 public static final JapaneseEra MEIJI = new JapaneseEra(-1, LocalDate.of(1868, 1, 1));
182 * @param since the date representing the first date of the era, validated not null
183 */
184 private JapaneseEra(int eraValue, LocalDate since) {
185 this.eraValue = eraValue;
186 this.since = since;
187 }
188
189 //-----------------------------------------------------------------------
190 /**
191 * Returns the Sun private Era instance corresponding to this {@code JapaneseEra}.
192 *
193 * @return the Sun private Era instance for this {@code JapaneseEra}.
194 */
195 sun.util.calendar.Era getPrivateEra() {
196 return ERA_CONFIG[ordinal(eraValue)];
197 }
198
199 //-----------------------------------------------------------------------
200 /**
201 * Obtains an instance of {@code JapaneseEra} from an {@code int} value.
202 * <p>
203 * The {@link #SHOWA} era that contains 1970-01-01 (ISO calendar system) has the value 1.
204 * Later era is numbered 2 ({@link #HEISEI}). Earlier eras are numbered 0 ({@link #TAISHO}),
205 * -1 ({@link #MEIJI}), only Meiji and later eras are supported.
206 * <p>
207 * In addition to the known era singletons, values for additional
208 * eras may be defined. Those values are the {@link Era#getValue()}
209 * of corresponding eras from the {@link #values()} method.
210 *
211 * @param japaneseEra the era to represent
212 * @return the {@code JapaneseEra} singleton, not null
213 * @throws DateTimeException if the value is invalid
214 */
215 public static JapaneseEra of(int japaneseEra) {
216 int i = ordinal(japaneseEra);
217 if (i < 0 || i >= KNOWN_ERAS.length) {
218 throw new DateTimeException("Invalid era: " + japaneseEra);
219 }
220 return KNOWN_ERAS[i];
221 }
222
223 /**
224 * Returns the {@code JapaneseEra} with the name.
225 * <p>
226 * The string must match exactly the name of the era.
227 * (Extraneous whitespace characters are not permitted.)
228 * <p>
229 * Valid era names are the names of eras returned from {@link #values()}.
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71 import java.io.ObjectInputStream;
72 import java.io.ObjectStreamException;
73 import java.io.Serializable;
74 import java.time.DateTimeException;
75 import java.time.LocalDate;
76 import java.time.format.DateTimeFormatterBuilder;
77 import java.time.format.TextStyle;
78 import java.time.temporal.ChronoField;
79 import java.time.temporal.TemporalField;
80 import java.time.temporal.UnsupportedTemporalTypeException;
81 import java.time.temporal.ValueRange;
82 import java.util.Arrays;
83 import java.util.Locale;
84 import java.util.Objects;
85
86 import sun.util.calendar.CalendarDate;
87
88 /**
89 * An era in the Japanese Imperial calendar system.
90 * <p>
91 * The Japanese government defines the official name and start date of
92 * each era. Eras are consecutive and their date ranges do not overlap,
93 * so the end date of one era is always the day before the start date
94 * of the next era.
95 * <p>
96 * The Java SE Platform supports all eras defined by the Japanese government,
97 * beginning with the Meiji era. Each era is identified in the Platform by an
98 * integer value and a name. The {@link #of(int)} and {@link #valueOf(String)}
99 * methods may be used to obtain a singleton instance of {@code JapaneseEra}
100 * for each era. The {@link #values()} method returns the singleton instances
101 * of all supported eras.
102 * <p>
103 * For convenience, this class declares a number of public static final fields
104 * that refer to singleton instances returned by the {@link #values()} method.
105 *
106 * @apiNote
107 * The fields declared in this class may evolve over time, in line with the
108 * results of the {@link #values()} method. However, there is not necessarily
109 * a 1:1 correspondence between the fields and the singleton instances.
110 *
111 * @apiNote
112 * The Japanese government may announce a new era and define its start
113 * date but not its official name. In this scenario, the singleton instance
114 * that represents the new era may return a name that is not stable until
115 * the official name is defined. Developers should exercise caution when
116 * relying on the name returned by any singleton instance that does not
117 * correspond to a public static final field.
118 *
119 * @implSpec
120 * This class is immutable and thread-safe.
121 *
122 * @since 1.8
123 */
124 public final class JapaneseEra
125 implements Era, Serializable {
126
127 // The offset value to 0-based index from the era value.
128 // i.e., getValue() + ERA_OFFSET == 0-based index
129 static final int ERA_OFFSET = 2;
130
131 static final sun.util.calendar.Era[] ERA_CONFIG;
132
133 /**
134 * The singleton instance for the 'Meiji' era (1868-01-01 - 1912-07-29)
135 * which has the value -1.
136 */
137 public static final JapaneseEra MEIJI = new JapaneseEra(-1, LocalDate.of(1868, 1, 1));
200 * @param since the date representing the first date of the era, validated not null
201 */
202 private JapaneseEra(int eraValue, LocalDate since) {
203 this.eraValue = eraValue;
204 this.since = since;
205 }
206
207 //-----------------------------------------------------------------------
208 /**
209 * Returns the Sun private Era instance corresponding to this {@code JapaneseEra}.
210 *
211 * @return the Sun private Era instance for this {@code JapaneseEra}.
212 */
213 sun.util.calendar.Era getPrivateEra() {
214 return ERA_CONFIG[ordinal(eraValue)];
215 }
216
217 //-----------------------------------------------------------------------
218 /**
219 * Obtains an instance of {@code JapaneseEra} from an {@code int} value.
220 * <ul>
221 * <li>The value {@code 1} is associated with the 'Showa' era, because
222 * it contains 1970-01-01 (ISO calendar system).</li>
223 * <li>The values {@code -1} and {@code 0} are associated with two earlier
224 * eras, Meiji and Taisho, respectively.</li>
225 * <li>A value greater than {@code 1} is associated with a later era,
226 * beginning with Heisei ({@code 2}).</li>
227 * </ul>
228 * <p>
229 * Every instance of {@code JapaneseEra} that is returned from the {@link #values()}
230 * method has an int value (available via {@link Era#getValue()} which is
231 * accepted by this method.
232 *
233 * @param japaneseEra the era to represent
234 * @return the {@code JapaneseEra} singleton, not null
235 * @throws DateTimeException if the value is invalid
236 */
237 public static JapaneseEra of(int japaneseEra) {
238 int i = ordinal(japaneseEra);
239 if (i < 0 || i >= KNOWN_ERAS.length) {
240 throw new DateTimeException("Invalid era: " + japaneseEra);
241 }
242 return KNOWN_ERAS[i];
243 }
244
245 /**
246 * Returns the {@code JapaneseEra} with the name.
247 * <p>
248 * The string must match exactly the name of the era.
249 * (Extraneous whitespace characters are not permitted.)
250 * <p>
251 * Valid era names are the names of eras returned from {@link #values()}.
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