399 lines
14 KiB
Java
399 lines
14 KiB
Java
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/*
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* Copyright (c) 2013, 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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* Copyright (c) 2013, 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.chrono;
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import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
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import static java.time.temporal.ChronoUnit.DAYS;
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import static java.time.temporal.ChronoUnit.MONTHS;
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import static java.time.temporal.ChronoUnit.YEARS;
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import java.io.DataInput;
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import java.io.DataOutput;
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import java.io.IOException;
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import java.io.InvalidObjectException;
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import java.io.ObjectInputStream;
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import java.io.ObjectStreamException;
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import java.io.Serializable;
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import java.time.DateTimeException;
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import java.time.temporal.ChronoUnit;
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import java.time.temporal.Temporal;
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import java.time.temporal.TemporalAccessor;
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import java.time.temporal.TemporalAmount;
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import java.time.temporal.TemporalQueries;
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import java.time.temporal.TemporalUnit;
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import java.time.temporal.UnsupportedTemporalTypeException;
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import java.time.temporal.ValueRange;
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import java.util.List;
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import java.util.Objects;
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/**
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* A period expressed in terms of a standard year-month-day calendar system.
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* <p>
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* This class is used by applications seeking to handle dates in non-ISO calendar systems.
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* For example, the Japanese, Minguo, Thai Buddhist and others.
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*
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* @implSpec
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* This class is immutable nad thread-safe.
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*
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* @since 1.8
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*/
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final class ChronoPeriodImpl
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implements ChronoPeriod, Serializable {
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// this class is only used by JDK chronology implementations and makes assumptions based on that fact
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/**
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* Serialization version.
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*/
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@java.io.Serial
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private static final long serialVersionUID = 57387258289L;
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/**
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* The set of supported units.
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*/
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private static final List<TemporalUnit> SUPPORTED_UNITS = List.of(YEARS, MONTHS, DAYS);
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/**
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* The chronology.
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*/
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@SuppressWarnings("serial") // Not statically typed as Serializable
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private final Chronology chrono;
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/**
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* The number of years.
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*/
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final int years;
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/**
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* The number of months.
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*/
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final int months;
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/**
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* The number of days.
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*/
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final int days;
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/**
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* Creates an instance.
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*/
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ChronoPeriodImpl(Chronology chrono, int years, int months, int days) {
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Objects.requireNonNull(chrono, "chrono");
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this.chrono = chrono;
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this.years = years;
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this.months = months;
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this.days = days;
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}
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//-----------------------------------------------------------------------
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@Override
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public long get(TemporalUnit unit) {
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if (unit == ChronoUnit.YEARS) {
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return years;
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} else if (unit == ChronoUnit.MONTHS) {
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return months;
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} else if (unit == ChronoUnit.DAYS) {
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return days;
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} else {
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throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
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}
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}
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@Override
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public List<TemporalUnit> getUnits() {
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return ChronoPeriodImpl.SUPPORTED_UNITS;
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}
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@Override
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public Chronology getChronology() {
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return chrono;
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}
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//-----------------------------------------------------------------------
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@Override
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public boolean isZero() {
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return years == 0 && months == 0 && days == 0;
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}
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@Override
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public boolean isNegative() {
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return years < 0 || months < 0 || days < 0;
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoPeriod plus(TemporalAmount amountToAdd) {
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ChronoPeriodImpl amount = validateAmount(amountToAdd);
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return new ChronoPeriodImpl(
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chrono,
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Math.addExact(years, amount.years),
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Math.addExact(months, amount.months),
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Math.addExact(days, amount.days));
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}
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@Override
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public ChronoPeriod minus(TemporalAmount amountToSubtract) {
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ChronoPeriodImpl amount = validateAmount(amountToSubtract);
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return new ChronoPeriodImpl(
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chrono,
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Math.subtractExact(years, amount.years),
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Math.subtractExact(months, amount.months),
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Math.subtractExact(days, amount.days));
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}
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/**
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* Obtains an instance of {@code ChronoPeriodImpl} from a temporal amount.
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*
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* @param amount the temporal amount to convert, not null
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* @return the period, not null
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*/
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private ChronoPeriodImpl validateAmount(TemporalAmount amount) {
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Objects.requireNonNull(amount, "amount");
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if (!(amount instanceof ChronoPeriodImpl period)) {
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throw new DateTimeException("Unable to obtain ChronoPeriod from TemporalAmount: " + amount.getClass());
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}
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if (!(chrono.equals(period.getChronology()))) {
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throw new ClassCastException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + period.getChronology().getId());
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}
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return period;
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoPeriod multipliedBy(int scalar) {
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if (this.isZero() || scalar == 1) {
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return this;
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}
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return new ChronoPeriodImpl(
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chrono,
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Math.multiplyExact(years, scalar),
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Math.multiplyExact(months, scalar),
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Math.multiplyExact(days, scalar));
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoPeriod normalized() {
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long monthRange = monthRange();
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if (monthRange > 0) {
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long totalMonths = years * monthRange + months;
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long splitYears = totalMonths / monthRange;
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int splitMonths = (int) (totalMonths % monthRange); // no overflow
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if (splitYears == years && splitMonths == months) {
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return this;
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}
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return new ChronoPeriodImpl(chrono, Math.toIntExact(splitYears), splitMonths, days);
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}
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return this;
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}
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/**
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* Calculates the range of months.
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*
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* @return the month range, -1 if not fixed range
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*/
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private long monthRange() {
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ValueRange startRange = chrono.range(MONTH_OF_YEAR);
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if (startRange.isFixed() && startRange.isIntValue()) {
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return startRange.getMaximum() - startRange.getMinimum() + 1;
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}
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return -1;
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}
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//-------------------------------------------------------------------------
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@Override
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public Temporal addTo(Temporal temporal) {
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validateChrono(temporal);
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if (months == 0) {
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if (years != 0) {
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temporal = temporal.plus(years, YEARS);
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}
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} else {
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long monthRange = monthRange();
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if (monthRange > 0) {
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temporal = temporal.plus(years * monthRange + months, MONTHS);
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} else {
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if (years != 0) {
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temporal = temporal.plus(years, YEARS);
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}
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temporal = temporal.plus(months, MONTHS);
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}
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}
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if (days != 0) {
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temporal = temporal.plus(days, DAYS);
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}
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return temporal;
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}
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@Override
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public Temporal subtractFrom(Temporal temporal) {
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validateChrono(temporal);
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if (months == 0) {
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if (years != 0) {
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temporal = temporal.minus(years, YEARS);
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}
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} else {
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long monthRange = monthRange();
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if (monthRange > 0) {
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temporal = temporal.minus(years * monthRange + months, MONTHS);
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} else {
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if (years != 0) {
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temporal = temporal.minus(years, YEARS);
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}
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temporal = temporal.minus(months, MONTHS);
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}
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}
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if (days != 0) {
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temporal = temporal.minus(days, DAYS);
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}
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return temporal;
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}
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/**
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* Validates that the temporal has the correct chronology.
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*/
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private void validateChrono(TemporalAccessor temporal) {
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Objects.requireNonNull(temporal, "temporal");
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Chronology temporalChrono = temporal.query(TemporalQueries.chronology());
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if (temporalChrono != null && chrono.equals(temporalChrono) == false) {
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throw new DateTimeException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + temporalChrono.getId());
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}
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}
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//-----------------------------------------------------------------------
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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return (obj instanceof ChronoPeriodImpl other)
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&& years == other.years && months == other.months
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&& days == other.days && chrono.equals(other.chrono);
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}
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@Override
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public int hashCode() {
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return (years + Integer.rotateLeft(months, 8) + Integer.rotateLeft(days, 16)) ^ chrono.hashCode();
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}
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//-----------------------------------------------------------------------
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@Override
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public String toString() {
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if (isZero()) {
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return getChronology().toString() + " P0D";
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} else {
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StringBuilder buf = new StringBuilder();
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buf.append(getChronology().toString()).append(' ').append('P');
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if (years != 0) {
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buf.append(years).append('Y');
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}
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if (months != 0) {
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buf.append(months).append('M');
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}
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if (days != 0) {
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buf.append(days).append('D');
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}
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return buf.toString();
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}
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}
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//-----------------------------------------------------------------------
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/**
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* Writes the Chronology using a
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* <a href="{@docRoot}/serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
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* <pre>
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* out.writeByte(12); // identifies this as a ChronoPeriodImpl
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* out.writeUTF(getId()); // the chronology
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* out.writeInt(years);
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* out.writeInt(months);
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* out.writeInt(days);
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* </pre>
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*
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* @return the instance of {@code Ser}, not null
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*/
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@java.io.Serial
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protected Object writeReplace() {
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return new Ser(Ser.CHRONO_PERIOD_TYPE, this);
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}
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/**
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* Defend against malicious streams.
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*
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* @param s the stream to read
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* @throws InvalidObjectException always
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*/
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@java.io.Serial
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private void readObject(ObjectInputStream s) throws ObjectStreamException {
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throw new InvalidObjectException("Deserialization via serialization delegate");
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}
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void writeExternal(DataOutput out) throws IOException {
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out.writeUTF(chrono.getId());
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out.writeInt(years);
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out.writeInt(months);
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out.writeInt(days);
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}
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||
|
|
|
||
|
|
static ChronoPeriodImpl readExternal(DataInput in) throws IOException {
|
||
|
|
Chronology chrono = Chronology.of(in.readUTF());
|
||
|
|
int years = in.readInt();
|
||
|
|
int months = in.readInt();
|
||
|
|
int days = in.readInt();
|
||
|
|
return new ChronoPeriodImpl(chrono, years, months, days);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|