JDK 11 java.base.jmod - Base Module
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⏎ java/time/chrono/ChronoZonedDateTimeImpl.java
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/*
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* Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer.
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* this list of conditions and the following disclaimer in the documentation
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package java.time.chrono;
import static java.time.temporal.ChronoUnit.SECONDS;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalUnit;
import java.time.zone.ZoneOffsetTransition;
import java.time.zone.ZoneRules;
import java.util.List;
import java.util.Objects;
/**
* A date-time with a time-zone in the calendar neutral API.
* <p>
* {@code ZoneChronoDateTime} is an immutable representation of a date-time with a time-zone.
* This class stores all date and time fields, to a precision of nanoseconds,
* as well as a time-zone and zone offset.
* <p>
* The purpose of storing the time-zone is to distinguish the ambiguous case where
* the local time-line overlaps, typically as a result of the end of daylight time.
* Information about the local-time can be obtained using methods on the time-zone.
*
* @implSpec
* This class is immutable and thread-safe.
*
* @serial Document the delegation of this class in the serialized-form specification.
* @param <D> the concrete type for the date of this date-time
* @since 1.8
*/
final class ChronoZonedDateTimeImpl<D extends ChronoLocalDate>
implements ChronoZonedDateTime<D>, Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = -5261813987200935591L;
/**
* The local date-time.
*/
private final transient ChronoLocalDateTimeImpl<D> dateTime;
/**
* The zone offset.
*/
private final transient ZoneOffset offset;
/**
* The zone ID.
*/
private final transient ZoneId zone;
//-----------------------------------------------------------------------
/**
* Obtains an instance from a local date-time using the preferred offset if possible.
*
* @param localDateTime the local date-time, not null
* @param zone the zone identifier, not null
* @param preferredOffset the zone offset, null if no preference
* @return the zoned date-time, not null
*/
static <R extends ChronoLocalDate> ChronoZonedDateTime<R> ofBest(
ChronoLocalDateTimeImpl<R> localDateTime, ZoneId zone, ZoneOffset preferredOffset) {
Objects.requireNonNull(localDateTime, "localDateTime");
Objects.requireNonNull(zone, "zone");
if (zone instanceof ZoneOffset) {
return new ChronoZonedDateTimeImpl<>(localDateTime, (ZoneOffset) zone, zone);
}
ZoneRules rules = zone.getRules();
LocalDateTime isoLDT = LocalDateTime.from(localDateTime);
List<ZoneOffset> validOffsets = rules.getValidOffsets(isoLDT);
ZoneOffset offset;
if (validOffsets.size() == 1) {
offset = validOffsets.get(0);
} else if (validOffsets.size() == 0) {
ZoneOffsetTransition trans = rules.getTransition(isoLDT);
localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
offset = trans.getOffsetAfter();
} else {
if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
offset = preferredOffset;
} else {
offset = validOffsets.get(0);
}
}
Objects.requireNonNull(offset, "offset"); // protect against bad ZoneRules
return new ChronoZonedDateTimeImpl<>(localDateTime, offset, zone);
}
/**
* Obtains an instance from an instant using the specified time-zone.
*
* @param chrono the chronology, not null
* @param instant the instant, not null
* @param zone the zone identifier, not null
* @return the zoned date-time, not null
*/
static ChronoZonedDateTimeImpl<?> ofInstant(Chronology chrono, Instant instant, ZoneId zone) {
ZoneRules rules = zone.getRules();
ZoneOffset offset = rules.getOffset(instant);
Objects.requireNonNull(offset, "offset"); // protect against bad ZoneRules
LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
ChronoLocalDateTimeImpl<?> cldt = (ChronoLocalDateTimeImpl<?>)chrono.localDateTime(ldt);
return new ChronoZonedDateTimeImpl<>(cldt, offset, zone);
}
/**
* Obtains an instance from an {@code Instant}.
*
* @param instant the instant to create the date-time from, not null
* @param zone the time-zone to use, validated not null
* @return the zoned date-time, validated not null
*/
@SuppressWarnings("unchecked")
private ChronoZonedDateTimeImpl<D> create(Instant instant, ZoneId zone) {
return (ChronoZonedDateTimeImpl<D>)ofInstant(getChronology(), instant, zone);
}
/**
* Casts the {@code Temporal} to {@code ChronoZonedDateTimeImpl} ensuring it bas the specified chronology.
*
* @param chrono the chronology to check for, not null
* @param temporal a date-time to cast, not null
* @return the date-time checked and cast to {@code ChronoZonedDateTimeImpl}, not null
* @throws ClassCastException if the date-time cannot be cast to ChronoZonedDateTimeImpl
* or the chronology is not equal this Chronology
*/
static <R extends ChronoLocalDate> ChronoZonedDateTimeImpl<R> ensureValid(Chronology chrono, Temporal temporal) {
@SuppressWarnings("unchecked")
ChronoZonedDateTimeImpl<R> other = (ChronoZonedDateTimeImpl<R>) temporal;
if (chrono.equals(other.getChronology()) == false) {
throw new ClassCastException("Chronology mismatch, required: " + chrono.getId()
+ ", actual: " + other.getChronology().getId());
}
return other;
}
//-----------------------------------------------------------------------
/**
* Constructor.
*
* @param dateTime the date-time, not null
* @param offset the zone offset, not null
* @param zone the zone ID, not null
*/
private ChronoZonedDateTimeImpl(ChronoLocalDateTimeImpl<D> dateTime, ZoneOffset offset, ZoneId zone) {
this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
this.offset = Objects.requireNonNull(offset, "offset");
this.zone = Objects.requireNonNull(zone, "zone");
}
//-----------------------------------------------------------------------
@Override
public ZoneOffset getOffset() {
return offset;
}
@Override
public ChronoZonedDateTime<D> withEarlierOffsetAtOverlap() {
ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
if (trans != null && trans.isOverlap()) {
ZoneOffset earlierOffset = trans.getOffsetBefore();
if (earlierOffset.equals(offset) == false) {
return new ChronoZonedDateTimeImpl<>(dateTime, earlierOffset, zone);
}
}
return this;
}
@Override
public ChronoZonedDateTime<D> withLaterOffsetAtOverlap() {
ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
if (trans != null) {
ZoneOffset offset = trans.getOffsetAfter();
if (offset.equals(getOffset()) == false) {
return new ChronoZonedDateTimeImpl<>(dateTime, offset, zone);
}
}
return this;
}
//-----------------------------------------------------------------------
@Override
public ChronoLocalDateTime<D> toLocalDateTime() {
return dateTime;
}
@Override
public ZoneId getZone() {
return zone;
}
@Override
public ChronoZonedDateTime<D> withZoneSameLocal(ZoneId zone) {
return ofBest(dateTime, zone, offset);
}
@Override
public ChronoZonedDateTime<D> withZoneSameInstant(ZoneId zone) {
Objects.requireNonNull(zone, "zone");
return this.zone.equals(zone) ? this : create(dateTime.toInstant(offset), zone);
}
//-----------------------------------------------------------------------
@Override
public boolean isSupported(TemporalField field) {
return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
}
//-----------------------------------------------------------------------
@Override
public ChronoZonedDateTime<D> with(TemporalField field, long newValue) {
if (field instanceof ChronoField) {
ChronoField f = (ChronoField) field;
switch (f) {
case INSTANT_SECONDS: return plus(newValue - toEpochSecond(), SECONDS);
case OFFSET_SECONDS: {
ZoneOffset offset = ZoneOffset.ofTotalSeconds(f.checkValidIntValue(newValue));
return create(dateTime.toInstant(offset), zone);
}
}
return ofBest(dateTime.with(field, newValue), zone, offset);
}
return ChronoZonedDateTimeImpl.ensureValid(getChronology(), field.adjustInto(this, newValue));
}
//-----------------------------------------------------------------------
@Override
public ChronoZonedDateTime<D> plus(long amountToAdd, TemporalUnit unit) {
if (unit instanceof ChronoUnit) {
return with(dateTime.plus(amountToAdd, unit));
}
return ChronoZonedDateTimeImpl.ensureValid(getChronology(), unit.addTo(this, amountToAdd)); /// TODO: Generics replacement Risk!
}
//-----------------------------------------------------------------------
@Override
public long until(Temporal endExclusive, TemporalUnit unit) {
Objects.requireNonNull(endExclusive, "endExclusive");
@SuppressWarnings("unchecked")
ChronoZonedDateTime<D> end = (ChronoZonedDateTime<D>) getChronology().zonedDateTime(endExclusive);
if (unit instanceof ChronoUnit) {
end = end.withZoneSameInstant(offset);
return dateTime.until(end.toLocalDateTime(), unit);
}
Objects.requireNonNull(unit, "unit");
return unit.between(this, end);
}
//-----------------------------------------------------------------------
/**
* Writes the ChronoZonedDateTime using a
* <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
* @serialData
* <pre>
* out.writeByte(3); // identifies a ChronoZonedDateTime
* out.writeObject(toLocalDateTime());
* out.writeObject(getOffset());
* out.writeObject(getZone());
* </pre>
*
* @return the instance of {@code Ser}, not null
*/
private Object writeReplace() {
return new Ser(Ser.CHRONO_ZONE_DATE_TIME_TYPE, this);
}
/**
* Defend against malicious streams.
*
* @param s the stream to read
* @throws InvalidObjectException always
*/
private void readObject(ObjectInputStream s) throws InvalidObjectException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(dateTime);
out.writeObject(offset);
out.writeObject(zone);
}
static ChronoZonedDateTime<?> readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
ChronoLocalDateTime<?> dateTime = (ChronoLocalDateTime<?>) in.readObject();
ZoneOffset offset = (ZoneOffset) in.readObject();
ZoneId zone = (ZoneId) in.readObject();
return dateTime.atZone(offset).withZoneSameLocal(zone);
// TODO: ZDT uses ofLenient()
}
//-------------------------------------------------------------------------
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ChronoZonedDateTime) {
return compareTo((ChronoZonedDateTime<?>) obj) == 0;
}
return false;
}
@Override
public int hashCode() {
return toLocalDateTime().hashCode() ^ getOffset().hashCode() ^ Integer.rotateLeft(getZone().hashCode(), 3);
}
@Override
public String toString() {
String str = toLocalDateTime().toString() + getOffset().toString();
if (getOffset() != getZone()) {
str += '[' + getZone().toString() + ']';
}
return str;
}
}
⏎ java/time/chrono/ChronoZonedDateTimeImpl.java
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