| /* |
| * 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) 2007-2012, 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 build.tools.tzdb; |
| |
| import static build.tools.tzdb.Utils.*; |
| import static build.tools.tzdb.LocalTime.SECONDS_PER_DAY; |
| import static build.tools.tzdb.ChronoField.DAY_OF_MONTH; |
| import static build.tools.tzdb.ChronoField.MONTH_OF_YEAR; |
| import static build.tools.tzdb.ChronoField.YEAR; |
| |
| import java.util.Objects; |
| |
| /** |
| * A date without a time-zone in the ISO-8601 calendar system, |
| * such as {@code 2007-12-03}. |
| * |
| * @since 1.8 |
| */ |
| final class LocalDate { |
| |
| /** |
| * The minimum supported {@code LocalDate}, '-999999999-01-01'. |
| * This could be used by an application as a "far past" date. |
| */ |
| public static final LocalDate MIN = new LocalDate(YEAR_MIN_VALUE, 1, 1); |
| /** |
| * The maximum supported {@code LocalDate}, '+999999999-12-31'. |
| * This could be used by an application as a "far future" date. |
| */ |
| public static final LocalDate MAX = new LocalDate(YEAR_MAX_VALUE, 12, 31); |
| |
| /** |
| * The number of days in a 400 year cycle. |
| */ |
| private static final int DAYS_PER_CYCLE = 146097; |
| /** |
| * The number of days from year zero to year 1970. |
| * There are five 400 year cycles from year zero to 2000. |
| * There are 7 leap years from 1970 to 2000. |
| */ |
| static final long DAYS_0000_TO_1970 = (DAYS_PER_CYCLE * 5L) - (30L * 365L + 7L); |
| |
| /** |
| * The year. |
| */ |
| private final int year; |
| /** |
| * The month-of-year. |
| */ |
| private final short month; |
| /** |
| * The day-of-month. |
| */ |
| private final short day; |
| |
| /** |
| * Obtains an instance of {@code LocalDate} from a year, month and day. |
| * <p> |
| * The day must be valid for the year and month, otherwise an exception will be thrown. |
| * |
| * @param year the year to represent, from MIN_YEAR to MAX_YEAR |
| * @param month the month-of-year to represent, from 1 (January) to 12 (December) |
| * @param dayOfMonth the day-of-month to represent, from 1 to 31 |
| * @return the local date, not null |
| * @throws DateTimeException if the value of any field is out of range |
| * @throws DateTimeException if the day-of-month is invalid for the month-year |
| */ |
| public static LocalDate of(int year, int month, int dayOfMonth) { |
| YEAR.checkValidValue(year); |
| MONTH_OF_YEAR.checkValidValue(month); |
| DAY_OF_MONTH.checkValidValue(dayOfMonth); |
| if (dayOfMonth > 28 && dayOfMonth > lengthOfMonth(month, isLeapYear(year))) { |
| if (dayOfMonth == 29) { |
| throw new DateTimeException("Invalid date 'February 29' as '" + year + "' is not a leap year"); |
| } else { |
| throw new DateTimeException("Invalid date '" + month + " " + dayOfMonth + "'"); |
| } |
| } |
| return new LocalDate(year, month, dayOfMonth); |
| } |
| |
| /** |
| * Constructor, previously validated. |
| * |
| * @param year the year to represent, from MIN_YEAR to MAX_YEAR |
| * @param month the month-of-year to represent, not null |
| * @param dayOfMonth the day-of-month to represent, valid for year-month, from 1 to 31 |
| */ |
| private LocalDate(int year, int month, int dayOfMonth) { |
| this.year = year; |
| this.month = (short) month; |
| this.day = (short) dayOfMonth; |
| } |
| |
| /** |
| * Gets the year field. |
| * <p> |
| * This method returns the primitive {@code int} value for the year. |
| * <p> |
| * The year returned by this method is proleptic as per {@code get(YEAR)}. |
| * To obtain the year-of-era, use {@code get(YEAR_OF_ERA}. |
| * |
| * @return the year, from MIN_YEAR to MAX_YEAR |
| */ |
| public int getYear() { |
| return year; |
| } |
| |
| /** |
| * Gets the month-of-year field as an int from 1 to 12. |
| * |
| * @return the month-of-year |
| */ |
| public int getMonth() { |
| return month; |
| } |
| |
| /** |
| * Gets the day-of-month field. |
| * <p> |
| * This method returns the primitive {@code int} value for the day-of-month. |
| * |
| * @return the day-of-month, from 1 to 31 |
| */ |
| public int getDayOfMonth() { |
| return day; |
| } |
| |
| /** |
| * Gets the day-of-week field, which is an int from 1 to 7. |
| * |
| * @return the day-of-week |
| */ |
| public int getDayOfWeek() { |
| return (int)floorMod(toEpochDay() + 3, 7) + 1; |
| } |
| |
| /** |
| * Returns a copy of this {@code LocalDate} with the specified number of days added. |
| * <p> |
| * This method adds the specified amount to the days field incrementing the |
| * month and year fields as necessary to ensure the result remains valid. |
| * The result is only invalid if the maximum/minimum year is exceeded. |
| * <p> |
| * For example, 2008-12-31 plus one day would result in 2009-01-01. |
| * <p> |
| * This instance is immutable and unaffected by this method call. |
| * |
| * @param daysToAdd the days to add, may be negative |
| * @return a {@code LocalDate} based on this date with the days added, not null |
| * @throws DateTimeException if the result exceeds the supported date range |
| */ |
| public LocalDate plusDays(long daysToAdd) { |
| if (daysToAdd == 0) { |
| return this; |
| } |
| long mjDay = addExact(toEpochDay(), daysToAdd); |
| return LocalDate.ofEpochDay(mjDay); |
| } |
| |
| /** |
| * Returns a copy of this {@code LocalDate} with the specified number of days subtracted. |
| * <p> |
| * This method subtracts the specified amount from the days field decrementing the |
| * month and year fields as necessary to ensure the result remains valid. |
| * The result is only invalid if the maximum/minimum year is exceeded. |
| * <p> |
| * For example, 2009-01-01 minus one day would result in 2008-12-31. |
| * <p> |
| * This instance is immutable and unaffected by this method call. |
| * |
| * @param daysToSubtract the days to subtract, may be negative |
| * @return a {@code LocalDate} based on this date with the days subtracted, not null |
| * @throws DateTimeException if the result exceeds the supported date range |
| */ |
| public LocalDate minusDays(long daysToSubtract) { |
| return (daysToSubtract == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-daysToSubtract)); |
| } |
| |
| /** |
| * Obtains an instance of {@code LocalDate} from the epoch day count. |
| * <p> |
| * The Epoch Day count is a simple incrementing count of days |
| * where day 0 is 1970-01-01. Negative numbers represent earlier days. |
| * |
| * @param epochDay the Epoch Day to convert, based on the epoch 1970-01-01 |
| * @return the local date, not null |
| * @throws DateTimeException if the epoch days exceeds the supported date range |
| */ |
| public static LocalDate ofEpochDay(long epochDay) { |
| long zeroDay = epochDay + DAYS_0000_TO_1970; |
| // find the march-based year |
| zeroDay -= 60; // adjust to 0000-03-01 so leap day is at end of four year cycle |
| long adjust = 0; |
| if (zeroDay < 0) { |
| // adjust negative years to positive for calculation |
| long adjustCycles = (zeroDay + 1) / DAYS_PER_CYCLE - 1; |
| adjust = adjustCycles * 400; |
| zeroDay += -adjustCycles * DAYS_PER_CYCLE; |
| } |
| long yearEst = (400 * zeroDay + 591) / DAYS_PER_CYCLE; |
| long doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400); |
| if (doyEst < 0) { |
| // fix estimate |
| yearEst--; |
| doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400); |
| } |
| yearEst += adjust; // reset any negative year |
| int marchDoy0 = (int) doyEst; |
| |
| // convert march-based values back to january-based |
| int marchMonth0 = (marchDoy0 * 5 + 2) / 153; |
| int month = (marchMonth0 + 2) % 12 + 1; |
| int dom = marchDoy0 - (marchMonth0 * 306 + 5) / 10 + 1; |
| yearEst += marchMonth0 / 10; |
| |
| // check year now we are certain it is correct |
| int year = YEAR.checkValidValue((int)yearEst); |
| return new LocalDate(year, month, dom); |
| } |
| |
| public long toEpochDay() { |
| long y = year; |
| long m = month; |
| long total = 0; |
| total += 365 * y; |
| if (y >= 0) { |
| total += (y + 3) / 4 - (y + 99) / 100 + (y + 399) / 400; |
| } else { |
| total -= y / -4 - y / -100 + y / -400; |
| } |
| total += ((367 * m - 362) / 12); |
| total += day - 1; |
| if (m > 2) { |
| total--; |
| if (isLeapYear(year) == false) { |
| total--; |
| } |
| } |
| return total - DAYS_0000_TO_1970; |
| } |
| |
| /** |
| * Compares this date to another date. |
| * <p> |
| * The comparison is primarily based on the date, from earliest to latest. |
| * It is "consistent with equals", as defined by {@link Comparable}. |
| * <p> |
| * If all the dates being compared are instances of {@code LocalDate}, |
| * then the comparison will be entirely based on the date. |
| * If some dates being compared are in different chronologies, then the |
| * chronology is also considered, see {@link java.time.temporal.ChronoLocalDate#compareTo}. |
| * |
| * @param other the other date to compare to, not null |
| * @return the comparator value, negative if less, positive if greater |
| */ |
| public int compareTo(LocalDate otherDate) { |
| int cmp = (year - otherDate.year); |
| if (cmp == 0) { |
| cmp = (month - otherDate.month); |
| if (cmp == 0) { |
| cmp = (day - otherDate.day); |
| } |
| } |
| return cmp; |
| } |
| |
| /** |
| * Checks if this date is equal to another date. |
| * <p> |
| * Compares this {@code LocalDate} with another ensuring that the date is the same. |
| * <p> |
| * Only objects of type {@code LocalDate} are compared, other types return false. |
| * To compare the dates of two {@code TemporalAccessor} instances, including dates |
| * in two different chronologies, use {@link ChronoField#EPOCH_DAY} as a comparator. |
| * |
| * @param obj the object to check, null returns false |
| * @return true if this is equal to the other date |
| */ |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof LocalDate) { |
| return compareTo((LocalDate) obj) == 0; |
| } |
| return false; |
| } |
| |
| /** |
| * A hash code for this date. |
| * |
| * @return a suitable hash code |
| */ |
| @Override |
| public int hashCode() { |
| int yearValue = year; |
| int monthValue = month; |
| int dayValue = day; |
| return (yearValue & 0xFFFFF800) ^ ((yearValue << 11) + (monthValue << 6) + (dayValue)); |
| } |
| |
| } |
