| /* |
| * Copyright (c) 2012, 2019, 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.temporal; |
| |
| import static java.time.temporal.ChronoField.EPOCH_DAY; |
| import static java.time.temporal.ChronoUnit.DAYS; |
| import static java.time.temporal.ChronoUnit.FOREVER; |
| |
| import java.time.DateTimeException; |
| import java.time.chrono.ChronoLocalDate; |
| import java.time.chrono.Chronology; |
| import java.time.format.ResolverStyle; |
| import java.util.Map; |
| |
| /** |
| * A set of date fields that provide access to Julian Days. |
| * <p> |
| * The Julian Day is a standard way of expressing date and time commonly used in the scientific community. |
| * It is expressed as a decimal number of whole days where days start at midday. |
| * This class represents variations on Julian Days that count whole days from midnight. |
| * <p> |
| * The fields are implemented relative to {@link ChronoField#EPOCH_DAY EPOCH_DAY}. |
| * The fields are supported, and can be queried and set if {@code EPOCH_DAY} is available. |
| * The fields work with all chronologies. |
| * |
| * @implSpec |
| * This is an immutable and thread-safe class. |
| * |
| * @since 1.8 |
| */ |
| public final class JulianFields { |
| |
| /** |
| * The offset from Julian to EPOCH DAY. |
| */ |
| private static final long JULIAN_DAY_OFFSET = 2440588L; |
| |
| /** |
| * Julian Day field. |
| * <p> |
| * This is an integer-based version of the Julian Day Number. |
| * Julian Day is a well-known system that represents the count of whole days since day 0, |
| * which is defined to be January 1, 4713 BCE in the Julian calendar, and -4713-11-24 Gregorian. |
| * The field has "JulianDay" as 'name', and 'DAYS' as 'baseUnit'. |
| * The field always refers to the local date-time, ignoring the offset or zone. |
| * <p> |
| * For date-times, 'JULIAN_DAY.getFrom()' assumes the same value from |
| * midnight until just before the next midnight. |
| * When 'JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. |
| * 'JULIAN_DAY.adjustInto()' and 'JULIAN_DAY.getFrom()' only apply to {@code Temporal} objects that |
| * can be converted into {@link ChronoField#EPOCH_DAY}. |
| * An {@link UnsupportedTemporalTypeException} is thrown for any other type of object. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a Julian Day field. |
| * In {@linkplain ResolverStyle#STRICT strict mode} and {@linkplain ResolverStyle#SMART smart mode} |
| * the Julian Day value is validated against the range of valid values. |
| * In {@linkplain ResolverStyle#LENIENT lenient mode} no validation occurs. |
| * |
| * <h4>Astronomical and Scientific Notes</h4> |
| * The standard astronomical definition uses a fraction to indicate the time-of-day, |
| * where each day is counted from midday to midday. For example, |
| * a fraction of 0 represents midday, a fraction of 0.25 |
| * represents 18:00, a fraction of 0.5 represents midnight and a fraction |
| * of 0.75 represents 06:00. |
| * <p> |
| * By contrast, this implementation has no fractional part, and counts |
| * days from midnight to midnight. |
| * This implementation uses an integer and days starting at midnight. |
| * The integer value for the Julian Day Number is the astronomical Julian Day value at midday |
| * of the date in question. |
| * This amounts to the astronomical Julian Day, rounded to an integer {@code JDN = floor(JD + 0.5)}. |
| * |
| * <pre> |
| * | ISO date | Julian Day Number | Astronomical Julian Day | |
| * | 1970-01-01T00:00 | 2,440,588 | 2,440,587.5 | |
| * | 1970-01-01T06:00 | 2,440,588 | 2,440,587.75 | |
| * | 1970-01-01T12:00 | 2,440,588 | 2,440,588.0 | |
| * | 1970-01-01T18:00 | 2,440,588 | 2,440,588.25 | |
| * | 1970-01-02T00:00 | 2,440,589 | 2,440,588.5 | |
| * | 1970-01-02T06:00 | 2,440,589 | 2,440,588.75 | |
| * | 1970-01-02T12:00 | 2,440,589 | 2,440,589.0 | |
| * </pre> |
| * <p> |
| * Julian Days are sometimes taken to imply Universal Time or UTC, but this |
| * implementation always uses the Julian Day number for the local date, |
| * regardless of the offset or time-zone. |
| */ |
| public static final TemporalField JULIAN_DAY = Field.JULIAN_DAY; |
| |
| /** |
| * Modified Julian Day field. |
| * <p> |
| * This is an integer-based version of the Modified Julian Day Number. |
| * Modified Julian Day (MJD) is a well-known system that counts days continuously. |
| * It is defined relative to astronomical Julian Day as {@code MJD = JD - 2400000.5}. |
| * Each Modified Julian Day runs from midnight to midnight. |
| * The field always refers to the local date-time, ignoring the offset or zone. |
| * <p> |
| * For date-times, 'MODIFIED_JULIAN_DAY.getFrom()' assumes the same value from |
| * midnight until just before the next midnight. |
| * When 'MODIFIED_JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. |
| * 'MODIFIED_JULIAN_DAY.adjustInto()' and 'MODIFIED_JULIAN_DAY.getFrom()' only apply to {@code Temporal} objects |
| * that can be converted into {@link ChronoField#EPOCH_DAY}. |
| * An {@link UnsupportedTemporalTypeException} is thrown for any other type of object. |
| * <p> |
| * This implementation is an integer version of MJD with the decimal part rounded to floor. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a Modified Julian Day field. |
| * In {@linkplain ResolverStyle#STRICT strict mode} and {@linkplain ResolverStyle#SMART smart mode} |
| * the Modified Julian Day value is validated against the range of valid values. |
| * In {@linkplain ResolverStyle#LENIENT lenient mode} no validation occurs. |
| * |
| * <h4>Astronomical and Scientific Notes</h4> |
| * <pre> |
| * | ISO date | Modified Julian Day | Decimal MJD | |
| * | 1970-01-01T00:00 | 40,587 | 40,587.0 | |
| * | 1970-01-01T06:00 | 40,587 | 40,587.25 | |
| * | 1970-01-01T12:00 | 40,587 | 40,587.5 | |
| * | 1970-01-01T18:00 | 40,587 | 40,587.75 | |
| * | 1970-01-02T00:00 | 40,588 | 40,588.0 | |
| * | 1970-01-02T06:00 | 40,588 | 40,588.25 | |
| * | 1970-01-02T12:00 | 40,588 | 40,588.5 | |
| * </pre> |
| * |
| * Modified Julian Days are sometimes taken to imply Universal Time or UTC, but this |
| * implementation always uses the Modified Julian Day for the local date, |
| * regardless of the offset or time-zone. |
| */ |
| public static final TemporalField MODIFIED_JULIAN_DAY = Field.MODIFIED_JULIAN_DAY; |
| |
| /** |
| * Rata Die field. |
| * <p> |
| * Rata Die counts whole days continuously starting day 1 at midnight at the beginning of 0001-01-01 (ISO). |
| * The field always refers to the local date-time, ignoring the offset or zone. |
| * <p> |
| * For date-times, 'RATA_DIE.getFrom()' assumes the same value from |
| * midnight until just before the next midnight. |
| * When 'RATA_DIE.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. |
| * 'RATA_DIE.adjustInto()' and 'RATA_DIE.getFrom()' only apply to {@code Temporal} objects |
| * that can be converted into {@link ChronoField#EPOCH_DAY}. |
| * An {@link UnsupportedTemporalTypeException} is thrown for any other type of object. |
| * <p> |
| * In the resolving phase of parsing, a date can be created from a Rata Die field. |
| * In {@linkplain ResolverStyle#STRICT strict mode} and {@linkplain ResolverStyle#SMART smart mode} |
| * the Rata Die value is validated against the range of valid values. |
| * In {@linkplain ResolverStyle#LENIENT lenient mode} no validation occurs. |
| */ |
| public static final TemporalField RATA_DIE = Field.RATA_DIE; |
| |
| /** |
| * Restricted constructor. |
| */ |
| private JulianFields() { |
| throw new AssertionError("Not instantiable"); |
| } |
| |
| /** |
| * Implementation of JulianFields. Each instance is a singleton. |
| */ |
| private static enum Field implements TemporalField { |
| JULIAN_DAY("JulianDay", DAYS, FOREVER, JULIAN_DAY_OFFSET), |
| MODIFIED_JULIAN_DAY("ModifiedJulianDay", DAYS, FOREVER, 40587L), |
| RATA_DIE("RataDie", DAYS, FOREVER, 719163L); |
| |
| private final transient String name; |
| private final transient TemporalUnit baseUnit; |
| private final transient TemporalUnit rangeUnit; |
| private final transient ValueRange range; |
| private final transient long offset; |
| |
| private Field(String name, TemporalUnit baseUnit, TemporalUnit rangeUnit, long offset) { |
| this.name = name; |
| this.baseUnit = baseUnit; |
| this.rangeUnit = rangeUnit; |
| this.range = ValueRange.of(-365243219162L + offset, 365241780471L + offset); |
| this.offset = offset; |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public TemporalUnit getBaseUnit() { |
| return baseUnit; |
| } |
| |
| @Override |
| public TemporalUnit getRangeUnit() { |
| return rangeUnit; |
| } |
| |
| @Override |
| public boolean isDateBased() { |
| return true; |
| } |
| |
| @Override |
| public boolean isTimeBased() { |
| return false; |
| } |
| |
| @Override |
| public ValueRange range() { |
| return range; |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public boolean isSupportedBy(TemporalAccessor temporal) { |
| return temporal.isSupported(EPOCH_DAY); |
| } |
| |
| @Override |
| public ValueRange rangeRefinedBy(TemporalAccessor temporal) { |
| if (isSupportedBy(temporal) == false) { |
| throw new DateTimeException("Unsupported field: " + this); |
| } |
| return range(); |
| } |
| |
| @Override |
| public long getFrom(TemporalAccessor temporal) { |
| return temporal.getLong(EPOCH_DAY) + offset; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <R extends Temporal> R adjustInto(R temporal, long newValue) { |
| if (range().isValidValue(newValue) == false) { |
| throw new DateTimeException("Invalid value: " + name + " " + newValue); |
| } |
| return (R) temporal.with(EPOCH_DAY, Math.subtractExact(newValue, offset)); |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public ChronoLocalDate resolve( |
| Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) { |
| long value = fieldValues.remove(this); |
| Chronology chrono = Chronology.from(partialTemporal); |
| if (resolverStyle == ResolverStyle.LENIENT) { |
| return chrono.dateEpochDay(Math.subtractExact(value, offset)); |
| } |
| range().checkValidValue(value, this); |
| return chrono.dateEpochDay(value - offset); |
| } |
| |
| //----------------------------------------------------------------------- |
| @Override |
| public String toString() { |
| return name; |
| } |
| } |
| } |
