313 lines
14 KiB
Java
313 lines
14 KiB
Java
/*
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* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of JSR-310 nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package java.time.temporal;
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import static java.time.temporal.ChronoField.EPOCH_DAY;
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import static java.time.temporal.ChronoUnit.DAYS;
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import static java.time.temporal.ChronoUnit.FOREVER;
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import java.time.DateTimeException;
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import java.time.chrono.ChronoLocalDate;
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import java.time.chrono.Chronology;
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import java.time.format.ResolverStyle;
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import java.util.Map;
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/**
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* A set of date fields that provide access to Julian Days.
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* <p>
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* The Julian Day is a standard way of expressing date and time commonly used in the scientific community.
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* It is expressed as a decimal number of whole days where days start at midday.
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* This class represents variations on Julian Days that count whole days from midnight.
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* <p>
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* The fields are implemented relative to {@link ChronoField#EPOCH_DAY EPOCH_DAY}.
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* The fields are supported, and can be queried and set if {@code EPOCH_DAY} is available.
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* The fields work with all chronologies.
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*
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* @implSpec
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* This is an immutable and thread-safe class.
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*
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* @since 1.8
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*/
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public final class JulianFields {
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/**
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* The offset from Julian to EPOCH DAY.
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*/
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private static final long JULIAN_DAY_OFFSET = 2440588L;
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/**
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* Julian Day field.
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* <p>
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* This is an integer-based version of the Julian Day Number.
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* Julian Day is a well-known system that represents the count of whole days since day 0,
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* which is defined to be January 1, 4713 BCE in the Julian calendar, and -4713-11-24 Gregorian.
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* The field has "JulianDay" as 'name', and 'DAYS' as 'baseUnit'.
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* The field always refers to the local date-time, ignoring the offset or zone.
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* <p>
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* For date-times, 'JULIAN_DAY.getFrom()' assumes the same value from
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* midnight until just before the next midnight.
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* When 'JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered.
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* 'JULIAN_DAY.adjustInto()' and 'JULIAN_DAY.getFrom()' only apply to {@code Temporal} objects that
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* can be converted into {@link ChronoField#EPOCH_DAY}.
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* An {@link UnsupportedTemporalTypeException} is thrown for any other type of object.
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* <p>
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* In the resolving phase of parsing, a date can be created from a Julian Day field.
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* In {@linkplain ResolverStyle#STRICT strict mode} and {@linkplain ResolverStyle#SMART smart mode}
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* the Julian Day value is validated against the range of valid values.
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* In {@linkplain ResolverStyle#LENIENT lenient mode} no validation occurs.
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*
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* <h4>Astronomical and Scientific Notes</h4>
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* The standard astronomical definition uses a fraction to indicate the time-of-day,
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* where each day is counted from midday to midday. For example,
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* a fraction of 0 represents midday, a fraction of 0.25
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* represents 18:00, a fraction of 0.5 represents midnight and a fraction
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* of 0.75 represents 06:00.
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* <p>
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* By contrast, this implementation has no fractional part, and counts
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* days from midnight to midnight.
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* This implementation uses an integer and days starting at midnight.
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* The integer value for the Julian Day Number is the astronomical Julian Day value at midday
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* of the date in question.
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* This amounts to the astronomical Julian Day, rounded to an integer {@code JDN = floor(JD + 0.5)}.
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*
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* <pre>
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* | ISO date | Julian Day Number | Astronomical Julian Day |
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* | 1970-01-01T00:00 | 2,440,588 | 2,440,587.5 |
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* | 1970-01-01T06:00 | 2,440,588 | 2,440,587.75 |
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* | 1970-01-01T12:00 | 2,440,588 | 2,440,588.0 |
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* | 1970-01-01T18:00 | 2,440,588 | 2,440,588.25 |
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* | 1970-01-02T00:00 | 2,440,589 | 2,440,588.5 |
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* | 1970-01-02T06:00 | 2,440,589 | 2,440,588.75 |
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* | 1970-01-02T12:00 | 2,440,589 | 2,440,589.0 |
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* </pre>
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* <p>
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* Julian Days are sometimes taken to imply Universal Time or UTC, but this
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* implementation always uses the Julian Day number for the local date,
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* regardless of the offset or time-zone.
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*/
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public static final TemporalField JULIAN_DAY = Field.JULIAN_DAY;
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/**
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* Modified Julian Day field.
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* <p>
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* This is an integer-based version of the Modified Julian Day Number.
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* Modified Julian Day (MJD) is a well-known system that counts days continuously.
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* It is defined relative to astronomical Julian Day as {@code MJD = JD - 2400000.5}.
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* Each Modified Julian Day runs from midnight to midnight.
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* The field always refers to the local date-time, ignoring the offset or zone.
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* <p>
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* For date-times, 'MODIFIED_JULIAN_DAY.getFrom()' assumes the same value from
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* midnight until just before the next midnight.
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* When 'MODIFIED_JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered.
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* 'MODIFIED_JULIAN_DAY.adjustInto()' and 'MODIFIED_JULIAN_DAY.getFrom()' only apply to {@code Temporal} objects
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* that can be converted into {@link ChronoField#EPOCH_DAY}.
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* An {@link UnsupportedTemporalTypeException} is thrown for any other type of object.
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* <p>
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* This implementation is an integer version of MJD with the decimal part rounded to floor.
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* <p>
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* In the resolving phase of parsing, a date can be created from a Modified Julian Day field.
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* In {@linkplain ResolverStyle#STRICT strict mode} and {@linkplain ResolverStyle#SMART smart mode}
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* the Modified Julian Day value is validated against the range of valid values.
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* In {@linkplain ResolverStyle#LENIENT lenient mode} no validation occurs.
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*
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* <h4>Astronomical and Scientific Notes</h4>
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* <pre>
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* | ISO date | Modified Julian Day | Decimal MJD |
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* | 1970-01-01T00:00 | 40,587 | 40,587.0 |
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* | 1970-01-01T06:00 | 40,587 | 40,587.25 |
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* | 1970-01-01T12:00 | 40,587 | 40,587.5 |
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* | 1970-01-01T18:00 | 40,587 | 40,587.75 |
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* | 1970-01-02T00:00 | 40,588 | 40,588.0 |
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* | 1970-01-02T06:00 | 40,588 | 40,588.25 |
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* | 1970-01-02T12:00 | 40,588 | 40,588.5 |
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* </pre>
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*
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* Modified Julian Days are sometimes taken to imply Universal Time or UTC, but this
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* implementation always uses the Modified Julian Day for the local date,
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* regardless of the offset or time-zone.
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*/
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public static final TemporalField MODIFIED_JULIAN_DAY = Field.MODIFIED_JULIAN_DAY;
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/**
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* Rata Die field.
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* <p>
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* Rata Die counts whole days continuously starting day 1 at midnight at the beginning of 0001-01-01 (ISO).
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* The field always refers to the local date-time, ignoring the offset or zone.
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* <p>
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* For date-times, 'RATA_DIE.getFrom()' assumes the same value from
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* midnight until just before the next midnight.
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* When 'RATA_DIE.adjustInto()' is applied to a date-time, the time of day portion remains unaltered.
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* 'RATA_DIE.adjustInto()' and 'RATA_DIE.getFrom()' only apply to {@code Temporal} objects
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* that can be converted into {@link ChronoField#EPOCH_DAY}.
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* An {@link UnsupportedTemporalTypeException} is thrown for any other type of object.
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* <p>
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* In the resolving phase of parsing, a date can be created from a Rata Die field.
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* In {@linkplain ResolverStyle#STRICT strict mode} and {@linkplain ResolverStyle#SMART smart mode}
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* the Rata Die value is validated against the range of valid values.
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* In {@linkplain ResolverStyle#LENIENT lenient mode} no validation occurs.
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*/
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public static final TemporalField RATA_DIE = Field.RATA_DIE;
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/**
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* Restricted constructor.
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*/
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private JulianFields() {
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throw new AssertionError("Not instantiable");
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}
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/**
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* Implementation of JulianFields. Each instance is a singleton.
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*/
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private static enum Field implements TemporalField {
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JULIAN_DAY("JulianDay", DAYS, FOREVER, JULIAN_DAY_OFFSET),
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MODIFIED_JULIAN_DAY("ModifiedJulianDay", DAYS, FOREVER, 40587L),
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RATA_DIE("RataDie", DAYS, FOREVER, 719163L);
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private final transient String name;
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private final transient TemporalUnit baseUnit;
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private final transient TemporalUnit rangeUnit;
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private final transient ValueRange range;
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private final transient long offset;
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private Field(String name, TemporalUnit baseUnit, TemporalUnit rangeUnit, long offset) {
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this.name = name;
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this.baseUnit = baseUnit;
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this.rangeUnit = rangeUnit;
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this.range = ValueRange.of(-365243219162L + offset, 365241780471L + offset);
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this.offset = offset;
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}
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//-----------------------------------------------------------------------
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@Override
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public TemporalUnit getBaseUnit() {
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return baseUnit;
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}
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@Override
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public TemporalUnit getRangeUnit() {
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return rangeUnit;
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}
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@Override
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public boolean isDateBased() {
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return true;
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}
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@Override
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public boolean isTimeBased() {
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return false;
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}
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@Override
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public ValueRange range() {
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return range;
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}
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//-----------------------------------------------------------------------
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@Override
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public boolean isSupportedBy(TemporalAccessor temporal) {
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return temporal.isSupported(EPOCH_DAY);
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}
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@Override
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public ValueRange rangeRefinedBy(TemporalAccessor temporal) {
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if (isSupportedBy(temporal) == false) {
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throw new DateTimeException("Unsupported field: " + this);
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}
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return range();
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}
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@Override
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public long getFrom(TemporalAccessor temporal) {
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return temporal.getLong(EPOCH_DAY) + offset;
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}
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@SuppressWarnings("unchecked")
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@Override
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public <R extends Temporal> R adjustInto(R temporal, long newValue) {
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if (range().isValidValue(newValue) == false) {
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throw new DateTimeException("Invalid value: " + name + " " + newValue);
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}
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return (R) temporal.with(EPOCH_DAY, Math.subtractExact(newValue, offset));
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoLocalDate resolve(
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Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) {
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long value = fieldValues.remove(this);
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Chronology chrono = Chronology.from(partialTemporal);
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if (resolverStyle == ResolverStyle.LENIENT) {
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return chrono.dateEpochDay(Math.subtractExact(value, offset));
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}
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range().checkValidValue(value, this);
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return chrono.dateEpochDay(value - offset);
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}
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//-----------------------------------------------------------------------
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@Override
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public String toString() {
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return name;
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}
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}
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}
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