394 lines
16 KiB
Java
394 lines
16 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) 2007-2012, 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.chrono;
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import static java.time.temporal.ChronoUnit.SECONDS;
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import java.io.IOException;
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import java.io.InvalidObjectException;
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import java.io.ObjectInput;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutput;
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import java.io.Serializable;
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import java.time.Instant;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.time.ZoneOffset;
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import java.time.temporal.ChronoField;
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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.TemporalField;
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import java.time.temporal.TemporalUnit;
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import java.time.zone.ZoneOffsetTransition;
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import java.time.zone.ZoneRules;
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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 date-time with a time-zone in the calendar neutral API.
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* <p>
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* {@code ZoneChronoDateTime} is an immutable representation of a date-time with a time-zone.
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* This class stores all date and time fields, to a precision of nanoseconds,
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* as well as a time-zone and zone offset.
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* <p>
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* The purpose of storing the time-zone is to distinguish the ambiguous case where
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* the local time-line overlaps, typically as a result of the end of daylight time.
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* Information about the local-time can be obtained using methods on the time-zone.
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*
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* @implSpec
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* This class is immutable and thread-safe.
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*
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* @serial Document the delegation of this class in the serialized-form specification.
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* @param <D> the concrete type for the date of this date-time
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* @since 1.8
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*/
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final class ChronoZonedDateTimeImpl<D extends ChronoLocalDate>
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implements ChronoZonedDateTime<D>, Serializable {
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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 = -5261813987200935591L;
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/**
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* The local date-time.
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*/
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private final transient ChronoLocalDateTimeImpl<D> dateTime;
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/**
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* The zone offset.
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*/
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private final transient ZoneOffset offset;
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/**
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* The zone ID.
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*/
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private final transient ZoneId zone;
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//-----------------------------------------------------------------------
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/**
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* Obtains an instance from a local date-time using the preferred offset if possible.
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*
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* @param localDateTime the local date-time, not null
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* @param zone the zone identifier, not null
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* @param preferredOffset the zone offset, null if no preference
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* @return the zoned date-time, not null
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*/
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static <R extends ChronoLocalDate> ChronoZonedDateTime<R> ofBest(
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ChronoLocalDateTimeImpl<R> localDateTime, ZoneId zone, ZoneOffset preferredOffset) {
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Objects.requireNonNull(localDateTime, "localDateTime");
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Objects.requireNonNull(zone, "zone");
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if (zone instanceof ZoneOffset) {
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return new ChronoZonedDateTimeImpl<>(localDateTime, (ZoneOffset) zone, zone);
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}
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ZoneRules rules = zone.getRules();
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LocalDateTime isoLDT = LocalDateTime.from(localDateTime);
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List<ZoneOffset> validOffsets = rules.getValidOffsets(isoLDT);
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ZoneOffset offset;
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if (validOffsets.size() == 1) {
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offset = validOffsets.get(0);
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} else if (validOffsets.size() == 0) {
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ZoneOffsetTransition trans = rules.getTransition(isoLDT);
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localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
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offset = trans.getOffsetAfter();
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} else {
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if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
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offset = preferredOffset;
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} else {
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offset = validOffsets.get(0);
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}
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}
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Objects.requireNonNull(offset, "offset"); // protect against bad ZoneRules
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return new ChronoZonedDateTimeImpl<>(localDateTime, offset, zone);
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}
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/**
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* Obtains an instance from an instant using the specified time-zone.
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*
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* @param chrono the chronology, not null
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* @param instant the instant, not null
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* @param zone the zone identifier, not null
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* @return the zoned date-time, not null
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*/
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static ChronoZonedDateTimeImpl<?> ofInstant(Chronology chrono, Instant instant, ZoneId zone) {
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ZoneRules rules = zone.getRules();
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ZoneOffset offset = rules.getOffset(instant);
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Objects.requireNonNull(offset, "offset"); // protect against bad ZoneRules
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LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
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ChronoLocalDateTimeImpl<?> cldt = (ChronoLocalDateTimeImpl<?>)chrono.localDateTime(ldt);
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return new ChronoZonedDateTimeImpl<>(cldt, offset, zone);
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}
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/**
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* Obtains an instance from an {@code Instant}.
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*
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* @param instant the instant to create the date-time from, not null
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* @param zone the time-zone to use, validated not null
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* @return the zoned date-time, validated not null
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*/
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@SuppressWarnings("unchecked")
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private ChronoZonedDateTimeImpl<D> create(Instant instant, ZoneId zone) {
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return (ChronoZonedDateTimeImpl<D>)ofInstant(getChronology(), instant, zone);
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}
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/**
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* Casts the {@code Temporal} to {@code ChronoZonedDateTimeImpl} ensuring it bas the specified chronology.
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*
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* @param chrono the chronology to check for, not null
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* @param temporal a date-time to cast, not null
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* @return the date-time checked and cast to {@code ChronoZonedDateTimeImpl}, not null
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* @throws ClassCastException if the date-time cannot be cast to ChronoZonedDateTimeImpl
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* or the chronology is not equal this Chronology
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*/
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static <R extends ChronoLocalDate> ChronoZonedDateTimeImpl<R> ensureValid(Chronology chrono, Temporal temporal) {
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@SuppressWarnings("unchecked")
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ChronoZonedDateTimeImpl<R> other = (ChronoZonedDateTimeImpl<R>) temporal;
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if (chrono.equals(other.getChronology()) == false) {
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throw new ClassCastException("Chronology mismatch, required: " + chrono.getId()
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+ ", actual: " + other.getChronology().getId());
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}
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return other;
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}
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//-----------------------------------------------------------------------
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/**
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* Constructor.
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*
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* @param dateTime the date-time, not null
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* @param offset the zone offset, not null
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* @param zone the zone ID, not null
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*/
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private ChronoZonedDateTimeImpl(ChronoLocalDateTimeImpl<D> dateTime, ZoneOffset offset, ZoneId zone) {
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this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
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this.offset = Objects.requireNonNull(offset, "offset");
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this.zone = Objects.requireNonNull(zone, "zone");
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}
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//-----------------------------------------------------------------------
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@Override
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public ZoneOffset getOffset() {
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return offset;
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}
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@Override
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public ChronoZonedDateTime<D> withEarlierOffsetAtOverlap() {
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ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
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if (trans != null && trans.isOverlap()) {
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ZoneOffset earlierOffset = trans.getOffsetBefore();
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if (earlierOffset.equals(offset) == false) {
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return new ChronoZonedDateTimeImpl<>(dateTime, earlierOffset, zone);
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}
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}
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return this;
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}
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@Override
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public ChronoZonedDateTime<D> withLaterOffsetAtOverlap() {
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ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
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if (trans != null) {
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ZoneOffset offset = trans.getOffsetAfter();
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if (offset.equals(getOffset()) == false) {
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return new ChronoZonedDateTimeImpl<>(dateTime, offset, zone);
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}
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}
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return this;
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoLocalDateTime<D> toLocalDateTime() {
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return dateTime;
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}
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@Override
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public ZoneId getZone() {
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return zone;
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}
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@Override
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public ChronoZonedDateTime<D> withZoneSameLocal(ZoneId zone) {
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return ofBest(dateTime, zone, offset);
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}
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@Override
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public ChronoZonedDateTime<D> withZoneSameInstant(ZoneId zone) {
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Objects.requireNonNull(zone, "zone");
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return this.zone.equals(zone) ? this : create(dateTime.toInstant(offset), zone);
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}
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//-----------------------------------------------------------------------
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@Override
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public boolean isSupported(TemporalField field) {
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return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoZonedDateTime<D> with(TemporalField field, long newValue) {
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if (field instanceof ChronoField chronoField) {
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switch (chronoField) {
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case INSTANT_SECONDS: return plus(newValue - toEpochSecond(), SECONDS);
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case OFFSET_SECONDS: {
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ZoneOffset offset = ZoneOffset.ofTotalSeconds(chronoField.checkValidIntValue(newValue));
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return create(dateTime.toInstant(offset), zone);
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}
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}
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return ofBest(dateTime.with(field, newValue), zone, offset);
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}
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return ChronoZonedDateTimeImpl.ensureValid(getChronology(), field.adjustInto(this, newValue));
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}
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//-----------------------------------------------------------------------
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@Override
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public ChronoZonedDateTime<D> plus(long amountToAdd, TemporalUnit unit) {
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if (unit instanceof ChronoUnit) {
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return with(dateTime.plus(amountToAdd, unit));
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}
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return ChronoZonedDateTimeImpl.ensureValid(getChronology(), unit.addTo(this, amountToAdd)); /// TODO: Generics replacement Risk!
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}
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//-----------------------------------------------------------------------
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@Override
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public long until(Temporal endExclusive, TemporalUnit unit) {
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Objects.requireNonNull(endExclusive, "endExclusive");
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@SuppressWarnings("unchecked")
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ChronoZonedDateTime<D> end = (ChronoZonedDateTime<D>) getChronology().zonedDateTime(endExclusive);
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if (unit instanceof ChronoUnit) {
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end = end.withZoneSameInstant(offset);
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return dateTime.until(end.toLocalDateTime(), unit);
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}
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Objects.requireNonNull(unit, "unit");
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return unit.between(this, end);
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}
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//-----------------------------------------------------------------------
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/**
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* Writes the ChronoZonedDateTime using a
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* <a href="{@docRoot}/serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
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* @serialData
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* <pre>
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* out.writeByte(3); // identifies a ChronoZonedDateTime
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* out.writeObject(toLocalDateTime());
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* out.writeObject(getOffset());
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* out.writeObject(getZone());
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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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private Object writeReplace() {
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return new Ser(Ser.CHRONO_ZONE_DATE_TIME_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 InvalidObjectException {
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throw new InvalidObjectException("Deserialization via serialization delegate");
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}
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void writeExternal(ObjectOutput out) throws IOException {
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out.writeObject(dateTime);
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out.writeObject(offset);
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out.writeObject(zone);
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}
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static ChronoZonedDateTime<?> readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
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ChronoLocalDateTime<?> dateTime = (ChronoLocalDateTime<?>) in.readObject();
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ZoneOffset offset = (ZoneOffset) in.readObject();
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ZoneId zone = (ZoneId) in.readObject();
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return dateTime.atZone(offset).withZoneSameLocal(zone);
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// TODO: ZDT uses ofLenient()
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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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if (obj instanceof ChronoZonedDateTime) {
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return compareTo((ChronoZonedDateTime<?>) obj) == 0;
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}
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return false;
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}
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@Override
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public int hashCode() {
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return toLocalDateTime().hashCode() ^ getOffset().hashCode() ^ Integer.rotateLeft(getZone().hashCode(), 3);
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}
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@Override
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public String toString() {
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String str = toLocalDateTime().toString() + getOffset().toString();
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if (getOffset() != getZone()) {
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str += '[' + getZone().toString() + ']';
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}
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return str;
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}
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}
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