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Extract chrono date classes to package scoped
Allows future conversion to public without breaking serialization
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src-standard/main/java/javax/time/chrono/CopticDate.java
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| /* | ||
| * 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, | ||
| * PCEUREMENT 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 javax.time.chrono; | ||
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| import java.io.Serializable; | ||
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| import javax.time.CalendricalException; | ||
| import javax.time.DateTimes; | ||
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| /** | ||
| * A date in the Coptic calendar system. | ||
| * <p> | ||
| * This date class implements a date for the {@link CopticChrono}. | ||
| * | ||
| * <h4>Implementation notes</h4> | ||
| * This class is immutable and thread-safe. | ||
| */ | ||
| final class CopticDate extends ChronoDate<CopticChrono> implements Comparable<ChronoDate<CopticChrono>>, Serializable { | ||
| // this class is package-scoped so that future conversion to public | ||
| // would not change serialization | ||
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| /** | ||
| * Serialization version. | ||
| */ | ||
| private static final long serialVersionUID = 1L; | ||
| /** | ||
| * The difference between the Coptic and Coptic epoch day count. | ||
| */ | ||
| private static final int EPOCH_DAY_DIFFERENCE = 574971; // TODO: correct value | ||
|
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| /** | ||
| * The proleptic year. | ||
| */ | ||
| private final int prolepticYear; | ||
| /** | ||
| * The month. | ||
| */ | ||
| private final short month; | ||
| /** | ||
| * The day. | ||
| */ | ||
| private final short day; | ||
|
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| //----------------------------------------------------------------------- | ||
| /** | ||
| * Creates an instance. | ||
| * | ||
| * @param epochDay the epoch day to convert based on 1970-01-01 (ISO) | ||
| * @return the Coptic date, not null | ||
| * @throws CalendricalException if the date is invalid | ||
| */ | ||
| static CopticDate ofEpochDay(long epochDay) { | ||
| // TODO: validate | ||
| // if (epochDay < MIN_EPOCH_DAY || epochDay > MAX_EPOCH_DAY) { | ||
| // throw new CalendricalRuleException("Date exceeds supported range for CopticDate", CopticChronology.YEAR); | ||
| // } | ||
| int prolepticYear = (int) (((epochDay * 4) + 1463) / 1461); | ||
| int startYearEpochDay = (prolepticYear - 1) * 365 + (prolepticYear / 4); | ||
| int doy0 = (int) (epochDay - startYearEpochDay); | ||
| int month = doy0 / 30 + 1; | ||
| int dom = doy0 % 30 + 1; | ||
| return new CopticDate(prolepticYear, month, dom); | ||
| } | ||
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| private static CopticDate resolvePreviousValid(int prolepticYear, int month, int day) { | ||
| if (month == 13 && day > 5) { | ||
| day = CopticChrono.INSTANCE.isLeapYear(prolepticYear) ? 6 : 5; | ||
| } | ||
| return new CopticDate(prolepticYear, month, day); | ||
| } | ||
|
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| //----------------------------------------------------------------------- | ||
| /** | ||
| * Creates an instance. | ||
| * | ||
| * @param prolepticYear the Coptic proleptic-year | ||
| * @param monthOfYear the Coptic month, from 1 to 13 | ||
| * @param dayOfMonth the Coptic day-of-month, from 1 to 30 | ||
| * @throws CalendricalException if the date is invalid | ||
| */ | ||
| CopticDate(int prolepticYear, int monthOfYear, int dayOfMonth) { | ||
| this.prolepticYear = prolepticYear; | ||
| this.month = (short) monthOfYear; | ||
| this.day = (short) dayOfMonth; | ||
| } | ||
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| /** | ||
| * Validates the object. | ||
| * | ||
| * @return the resolved date, not null | ||
| */ | ||
| private Object readResolve() { | ||
| // TODO: validate | ||
| return this; | ||
| } | ||
|
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| //----------------------------------------------------------------------- | ||
| @Override | ||
| public Chrono getChronology() { | ||
| return CopticChrono.INSTANCE; | ||
| } | ||
|
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| //----------------------------------------------------------------------- | ||
| @Override | ||
| public int get(ChronoDateField field) { | ||
| DateTimes.checkNotNull(field, "ChronoField must not be null"); | ||
| switch (field) { | ||
| case DAY_OF_WEEK: return DateTimes.floorMod(toEpochDay() + 3, 7) + 1; | ||
| case DAY_OF_MONTH: return day; | ||
| case DAY_OF_YEAR: return (month - 1) * 30 + day; | ||
| case MONTH_OF_YEAR: return month; | ||
| case YEAR_OF_ERA: return (prolepticYear >= 1 ? prolepticYear : 1 - prolepticYear); | ||
| case PROLEPTIC_YEAR: return prolepticYear; | ||
| case ERA: return (prolepticYear >= 1 ? 1 : 0); | ||
| } | ||
| throw new CalendricalException("Unknown field"); | ||
| } | ||
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| @Override | ||
| public CopticDate with(ChronoDateField field, int newValue) { | ||
| DateTimes.checkNotNull(field, "ChronoField must not be null"); | ||
| // TODO: validate value | ||
| int curValue = get(field); | ||
| if (curValue == newValue) { | ||
| return this; | ||
| } | ||
| switch (field) { | ||
| case DAY_OF_WEEK: return plusDays(newValue - curValue); | ||
| case DAY_OF_MONTH: return resolvePreviousValid(prolepticYear, month, newValue); | ||
| case DAY_OF_YEAR: return resolvePreviousValid(prolepticYear, ((newValue - 1) / 30) + 1, ((newValue - 1) % 30) + 1); | ||
| case MONTH_OF_YEAR: return resolvePreviousValid(prolepticYear, newValue, day); | ||
| case YEAR_OF_ERA: return resolvePreviousValid(prolepticYear >= 1 ? newValue : 1 - newValue, month, day); | ||
| case PROLEPTIC_YEAR: return resolvePreviousValid(newValue, month, day); | ||
| case ERA: return resolvePreviousValid(1 - prolepticYear, month, day); | ||
| } | ||
| throw new CalendricalException("Unknown field"); | ||
| } | ||
|
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| //----------------------------------------------------------------------- | ||
| @Override | ||
| public CopticDate plusYears(long years) { | ||
| return plusMonths(DateTimes.safeMultiply(years, 13)); | ||
| } | ||
|
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| @Override | ||
| public CopticDate plusMonths(long months) { | ||
| if (months == 0) { | ||
| return this; | ||
| } | ||
| long curEm = prolepticYear * 13L + (month - 1); | ||
| long calcEm = DateTimes.safeAdd(curEm, months); | ||
| int newYear = DateTimes.safeToInt(DateTimes.floorDiv(calcEm, 13)); | ||
| int newMonth = DateTimes.floorMod(calcEm, 13) + 1; | ||
| return resolvePreviousValid(newYear, newMonth, day); | ||
| } | ||
|
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| @Override | ||
| public CopticDate plusDays(long days) { | ||
| if (days == 0) { | ||
| return this; | ||
| } | ||
| return CopticDate.ofEpochDay(DateTimes.safeAdd(toEpochDay(), days)); | ||
| } | ||
|
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| //----------------------------------------------------------------------- | ||
| @Override | ||
| public long toEpochDay() { | ||
| long year = (long) prolepticYear; | ||
| long copticEpochDay = (year * 365) + DateTimes.floorDiv(year, 4) + (getDayOfYear() - 1); | ||
| return copticEpochDay - EPOCH_DAY_DIFFERENCE; | ||
| } | ||
|
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| } |
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