- * Most calendar systems have a single epoch dividing the time-line into two eras. - * However, some calendar systems, have multiple eras, such as one for the reign - * of each leader. - * In all cases, the era is conceptually the largest division of the time-line. - * Each chronology defines the Era's that are known Eras and a - * {@link Chrono#eras Chrono.eras} to get the valid eras. - *
- * For example, the Thai Buddhist calendar system divides time into two eras, - * before and after a single date. By contrast, the Japanese calendar system - * has one era for the reign of each Emperor. - *
- * Instances of {@code Era} may be compared using the {@code ==} operator. - * - *
- * All fields, including eras, have an associated numeric value. - * The meaning of the numeric value for era is determined by the chronology - * according to these principles: - *
- * - * @return the numeric era value - */ - int getValue(); - - /** - * Gets the chronology of this era. - *
- * The {@code Chrono} represents the calendar system in use. - * This always returns the standard form of the chronology. - * - * @return the chronology, not null - */ - C getChrono(); - - //----------------------------------------------------------------------- - /** - * Obtains a date in this era given the year-of-era, month, and day. - *
- * This era is combined with the given date fields to form a date. - * The year specified must be the year-of-era. - * Methods to create a date from the proleptic-year are on {@code Chrono}. - * This always uses the standard form of the chronology. - *
- * This default implementation invokes the factory method on {@link Chrono}.
- *
- * @param yearOfEra the calendar system year-of-era
- * @param month the calendar system month-of-year
- * @param day the calendar system day-of-month
- * @return a local date based on this era and the specified year-of-era, month and day
- */
- public default ChronoLocalDate
- * This era is combined with the given date fields to form a date.
- * The year specified must be the year-of-era.
- * Methods to create a date from the proleptic-year are on {@code Chrono}.
- * This always uses the standard form of the chronology.
- *
- * This default implementation invokes the factory method on {@link Chrono}.
- *
- * @param yearOfEra the calendar system year-of-era
- * @param dayOfYear the calendar system day-of-year
- * @return a local date based on this era and the specified year-of-era and day-of-year
- */
- public default ChronoLocalDate
- * This checks if this era can be queried for the specified field.
- * If false, then calling the {@link #range(TemporalField) range} and
- * {@link #get(TemporalField) get} methods will throw an exception.
- *
- * If the field is a {@link ChronoField} then the query is implemented here.
- * The {@code ERA} field returns true.
- * All other {@code ChronoField} instances will return false.
- *
- * If the field is not a {@code ChronoField}, then the result of this method
- * is obtained by invoking {@code TemporalField.doIsSupported(TemporalAccessor)}
- * passing {@code this} as the argument.
- * Whether the field is supported is determined by the field.
- *
- * @param field the field to check, null returns false
- * @return true if the field is supported on this era, false if not
- */
- @Override
- public default boolean isSupported(TemporalField field) {
- if (field instanceof ChronoField) {
- return field == ERA;
- }
- return field != null && field.doIsSupported(this);
- }
-
- /**
- * Gets the range of valid values for the specified field.
- *
- * 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.
- *
- * 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 a {@code DateTimeException}.
- *
- * If the field is not a {@code ChronoField}, then the result of this method
- * is obtained by invoking {@code TemporalField.doRange(TemporalAccessor)}
- * passing {@code this} as the argument.
- * Whether the range can be obtained is determined by the field.
- *
- * @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
- */
- @Override // override for Javadoc
- public default ValueRange range(TemporalField field) {
- return TemporalAccessor.super.range(field);
- }
-
- /**
- * Gets the value of the specified field from this era as an {@code int}.
- *
- * This queries this era for the value for the specified field.
- * The returned value will always be within the valid range of values for the field.
- * If it is not possible to return the value, because the field is not supported
- * or for some other reason, an exception is thrown.
- *
- * If the field is a {@link ChronoField} then the query is implemented here.
- * The {@code ERA} field returns the value of the era.
- * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
- *
- * If the field is not a {@code ChronoField}, then the result of this method
- * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)}
- * passing {@code this} as the argument. Whether the value can be obtained,
- * and what the value represents, is determined by the field.
- *
- * @param field the field to get, not null
- * @return the value for the field
- * @throws DateTimeException if a value for the field cannot be obtained
- * @throws ArithmeticException if numeric overflow occurs
- */
- @Override // override for Javadoc and performance
- public default int get(TemporalField field) {
- if (field == ERA) {
- return getValue();
- }
- return range(field).checkValidIntValue(getLong(field), field);
- }
-
- /**
- * Gets the value of the specified field from this era as a {@code long}.
- *
- * This queries this era for the value for the specified field.
- * If it is not possible to return the value, because the field is not supported
- * or for some other reason, an exception is thrown.
- *
- * If the field is a {@link ChronoField} then the query is implemented here.
- * The {@code ERA} field returns the value of the era.
- * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
- *
- * If the field is not a {@code ChronoField}, then the result of this method
- * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)}
- * passing {@code this} as the argument. Whether the value can be obtained,
- * and what the value represents, is determined by the field.
- *
- * @param field the field to get, not null
- * @return the value for the field
- * @throws DateTimeException if a value for the field cannot be obtained
- * @throws ArithmeticException if numeric overflow occurs
- */
- @Override
- public default long getLong(TemporalField field) {
- if (field == ERA) {
- return getValue();
- } else if (field instanceof ChronoField) {
- throw new DateTimeException("Unsupported field: " + field.getName());
- }
- return field.doGet(this);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Queries this era using the specified query.
- *
- * This queries this era using the specified query strategy object.
- * The {@code TemporalQuery} object defines the logic to be used to
- * obtain the result. Read the documentation of the query to understand
- * what the result of this method will be.
- *
- * The result of this method is obtained by invoking the
- * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
- * specified query passing {@code this} as the argument.
- *
- * @param
- * This returns a temporal object of the same observable type as the input
- * with the era changed to be the same as this.
- *
- * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
- * passing {@link ChronoField#ERA} as the field.
- *
- * In most cases, it is clearer to reverse the calling pattern by using
- * {@link Temporal#with(TemporalAdjuster)}:
- *
- * This instance is immutable and unaffected by this method call.
- *
- * @param temporal the target object to be adjusted, not null
- * @return the adjusted object, not null
- * @throws DateTimeException if unable to make the adjustment
- * @throws ArithmeticException if numeric overflow occurs
- */
- @Override
- public default Temporal adjustInto(Temporal temporal) {
- return temporal.with(ERA, getValue());
- }
-
- //-----------------------------------------------------------------------
- /**
- * Gets the textual representation of this era.
- *
- * This returns the textual name used to identify the era.
- * The parameters control the style of the returned text and the locale.
- *
- * If no textual mapping is found then the {@link #getValue() numeric value} is returned.
- *
- * This default implementation is suitable for all implementations.
- *
- * @param style the style of the text required, not null
- * @param locale the locale to use, not null
- * @return the text value of the era, not null
- */
- public default String getText(TextStyle style, Locale locale) {
- return new DateTimeFormatterBuilder().appendText(ERA, style).toFormatter(locale).print(this);
- }
-
- // NOTE: methods to convert year-of-era/proleptic-year cannot be here as they may depend on month/day (Japanese)
-}
--- /dev/null 2013-01-18 16:17:08.886776012 -0800
+++ new/src/share/classes/java/time/chrono/Era.java 2013-02-08 10:48:12.000000000 -0800
@@ -0,0 +1,367 @@
+/*
+ * Copyright (c) 2012, 2013, 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
+ * or visit www.oracle.com if you need additional information or have any
+ * 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.temporal.ChronoField.ERA;
+import static java.time.temporal.ChronoUnit.ERAS;
+
+import java.time.DateTimeException;
+import java.time.format.DateTimeFormatterBuilder;
+import java.time.format.TextStyle;
+import java.time.temporal.ChronoField;
+import java.time.temporal.Queries;
+import java.time.temporal.Temporal;
+import java.time.temporal.TemporalAccessor;
+import java.time.temporal.TemporalAdjuster;
+import java.time.temporal.TemporalField;
+import java.time.temporal.TemporalQuery;
+import java.time.temporal.ValueRange;
+import java.util.Locale;
+
+/**
+ * An era of the time-line.
+ *
+ * Most calendar systems have a single epoch dividing the time-line into two eras.
+ * However, some calendar systems, have multiple eras, such as one for the reign
+ * of each leader.
+ * In all cases, the era is conceptually the largest division of the time-line.
+ * Each chronology defines the Era's that are known Eras and a
+ * {@link Chronology#eras Chronology.eras} to get the valid eras.
+ *
+ * For example, the Thai Buddhist calendar system divides time into two eras,
+ * before and after a single date. By contrast, the Japanese calendar system
+ * has one era for the reign of each Emperor.
+ *
+ * Instances of {@code Era} may be compared using the {@code ==} operator.
+ *
+ *
+ * All fields, including eras, have an associated numeric value.
+ * The meaning of the numeric value for era is determined by the chronology
+ * according to these principles:
+ *
+ *
+ * @return the numeric era value
+ */
+ int getValue();
+
+ /**
+ * Gets the chronology of this era.
+ *
+ * The {@code Chronology} represents the calendar system in use.
+ * This always returns the standard form of the chronology.
+ *
+ * @return the chronology, not null
+ */
+ Chronology getChronology();
+
+ //-----------------------------------------------------------------------
+ /**
+ * Obtains a date in this era given the year-of-era, month, and day.
+ *
+ * This era is combined with the given date fields to form a date.
+ * The year specified must be the year-of-era.
+ * Methods to create a date from the proleptic-year are on {@code Chronology}.
+ * This always uses the standard form of the chronology.
+ *
+ * This default implementation invokes the factory method on {@link Chronology}.
+ *
+ * @param yearOfEra the calendar system year-of-era
+ * @param month the calendar system month-of-year
+ * @param day the calendar system day-of-month
+ * @return a local date based on this era and the specified year-of-era, month and day
+ */
+ public default ChronoLocalDate date(int yearOfEra, int month, int day) {
+ return getChronology().date(this, yearOfEra, month, day);
+ }
+
+
+ /**
+ * Obtains a date in this era given year-of-era and day-of-year fields.
+ *
+ * This era is combined with the given date fields to form a date.
+ * The year specified must be the year-of-era.
+ * Methods to create a date from the proleptic-year are on {@code Chronology}.
+ * This always uses the standard form of the chronology.
+ *
+ * This default implementation invokes the factory method on {@link Chronology}.
+ *
+ * @param yearOfEra the calendar system year-of-era
+ * @param dayOfYear the calendar system day-of-year
+ * @return a local date based on this era and the specified year-of-era and day-of-year
+ */
+ public default ChronoLocalDate dateYearDay(int yearOfEra, int dayOfYear) {
+ return getChronology().dateYearDay(this, yearOfEra, dayOfYear);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Checks if the specified field is supported.
+ *
+ * This checks if this era can be queried for the specified field.
+ * If false, then calling the {@link #range(TemporalField) range} and
+ * {@link #get(TemporalField) get} methods will throw an exception.
+ *
+ * If the field is a {@link ChronoField} then the query is implemented here.
+ * The {@code ERA} field returns true.
+ * All other {@code ChronoField} instances will return false.
+ *
+ * If the field is not a {@code ChronoField}, then the result of this method
+ * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
+ * passing {@code this} as the argument.
+ * Whether the field is supported is determined by the field.
+ *
+ * @param field the field to check, null returns false
+ * @return true if the field is supported on this era, false if not
+ */
+ @Override
+ public default boolean isSupported(TemporalField field) {
+ if (field instanceof ChronoField) {
+ return field == ERA;
+ }
+ return field != null && field.isSupportedBy(this);
+ }
+
+ /**
+ * Gets the range of valid values for the specified field.
+ *
+ * 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.
+ *
+ * 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 a {@code DateTimeException}.
+ *
+ * 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.
+ *
+ * @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
+ */
+ @Override // override for Javadoc
+ public default ValueRange range(TemporalField field) {
+ return TemporalAccessor.super.range(field);
+ }
+
+ /**
+ * Gets the value of the specified field from this era as an {@code int}.
+ *
+ * This queries this era for the value for the specified field.
+ * The returned value will always be within the valid range of values for the field.
+ * If it is not possible to return the value, because the field is not supported
+ * or for some other reason, an exception is thrown.
+ *
+ * If the field is a {@link ChronoField} then the query is implemented here.
+ * The {@code ERA} field returns the value of the era.
+ * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
+ *
+ * If the field is not a {@code ChronoField}, then the result of this method
+ * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
+ * passing {@code this} as the argument. Whether the value can be obtained,
+ * and what the value represents, is determined by the field.
+ *
+ * @param field the field to get, not null
+ * @return the value for the field
+ * @throws DateTimeException if a value for the field cannot be obtained
+ * @throws ArithmeticException if numeric overflow occurs
+ */
+ @Override // override for Javadoc and performance
+ public default int get(TemporalField field) {
+ if (field == ERA) {
+ return getValue();
+ }
+ return range(field).checkValidIntValue(getLong(field), field);
+ }
+
+ /**
+ * Gets the value of the specified field from this era as a {@code long}.
+ *
+ * This queries this era for the value for the specified field.
+ * If it is not possible to return the value, because the field is not supported
+ * or for some other reason, an exception is thrown.
+ *
+ * If the field is a {@link ChronoField} then the query is implemented here.
+ * The {@code ERA} field returns the value of the era.
+ * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
+ *
+ * If the field is not a {@code ChronoField}, then the result of this method
+ * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
+ * passing {@code this} as the argument. Whether the value can be obtained,
+ * and what the value represents, is determined by the field.
+ *
+ * @param field the field to get, not null
+ * @return the value for the field
+ * @throws DateTimeException if a value for the field cannot be obtained
+ * @throws ArithmeticException if numeric overflow occurs
+ */
+ @Override
+ public default long getLong(TemporalField field) {
+ if (field == ERA) {
+ return getValue();
+ } else if (field instanceof ChronoField) {
+ throw new DateTimeException("Unsupported field: " + field.getName());
+ }
+ return field.getFrom(this);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Queries this era using the specified query.
+ *
+ * This queries this era using the specified query strategy object.
+ * The {@code TemporalQuery} object defines the logic to be used to
+ * obtain the result. Read the documentation of the query to understand
+ * what the result of this method will be.
+ *
+ * The result of this method is obtained by invoking the
+ * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
+ * specified query passing {@code this} as the argument.
+ *
+ * @param
+ * This returns a temporal object of the same observable type as the input
+ * with the era changed to be the same as this.
+ *
+ * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
+ * passing {@link ChronoField#ERA} as the field.
+ *
+ * In most cases, it is clearer to reverse the calling pattern by using
+ * {@link Temporal#with(TemporalAdjuster)}:
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @param temporal the target object to be adjusted, not null
+ * @return the adjusted object, not null
+ * @throws DateTimeException if unable to make the adjustment
+ * @throws ArithmeticException if numeric overflow occurs
+ */
+ @Override
+ public default Temporal adjustInto(Temporal temporal) {
+ return temporal.with(ERA, getValue());
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Gets the textual representation of this era.
+ *
+ * This returns the textual name used to identify the era,
+ * suitable for presentation to the user.
+ * The parameters control the style of the returned text and the locale.
+ *
+ * If no textual mapping is found then the {@link #getValue() numeric value} is returned.
+ *
+ * This default implementation is suitable for all implementations.
+ *
+ * @param style the style of the text required, not null
+ * @param locale the locale to use, not null
+ * @return the text value of the era, not null
+ */
+ public default String getDisplayName(TextStyle style, Locale locale) {
+ return new DateTimeFormatterBuilder().appendText(ERA, style).toFormatter(locale).format(this);
+ }
+
+ // NOTE: methods to convert year-of-era/proleptic-year cannot be here as they may depend on month/day (Japanese)
+}
- * // these two lines are equivalent, but the second approach is recommended
- * temporal = thisEra.adjustInto(temporal);
- * temporal = temporal.with(thisEra);
- *
- * Specification for implementors
+ * This interface must be implemented with care to ensure other classes operate correctly.
+ * All implementations must be singletons - final, immutable and thread-safe.
+ * It is recommended to use an enum whenever possible.
+ *
+ * @since 1.8
+ */
+public interface Era extends TemporalAccessor, TemporalAdjuster {
+
+ /**
+ * Gets the numeric value associated with the era as defined by the chronology.
+ * Each chronology defines the predefined Eras and methods to list the Eras
+ * of the chronology.
+ *
+ *
+ * // these two lines are equivalent, but the second approach is recommended
+ * temporal = thisEra.adjustInto(temporal);
+ * temporal = temporal.with(thisEra);
+ *
+ *