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Backport of JSR-310 from JDK 8 to JDK 7 and JDK 6. NOT an implementation of the JSR.
The newest version!
/*
* Copyright (c) 2007-present, 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 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.ObjectOutput;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.util.List;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.jdk8.Jdk8Methods;
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;
/**
* A date-time with a time-zone in the calendar neutral API.
*
* {@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.
*
* 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.
*
*
Specification for implementors
* This class is immutable and thread-safe.
*
* @param the date type
*/
final class ChronoZonedDateTimeImpl
extends ChronoZonedDateTime
implements Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = -5261813987200935591L;
/**
* The local date-time.
*/
private final ChronoLocalDateTimeImpl dateTime;
/**
* The zone offset.
*/
private final ZoneOffset offset;
/**
* The zone ID.
*/
private final 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 ChronoZonedDateTime ofBest(
ChronoLocalDateTimeImpl localDateTime, ZoneId zone, ZoneOffset preferredOffset) {
Jdk8Methods.requireNonNull(localDateTime, "localDateTime");
Jdk8Methods.requireNonNull(zone, "zone");
if (zone instanceof ZoneOffset) {
return new ChronoZonedDateTimeImpl(localDateTime, (ZoneOffset) zone, zone);
}
ZoneRules rules = zone.getRules();
LocalDateTime isoLDT = LocalDateTime.from(localDateTime);
List 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);
}
}
Jdk8Methods.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);
Jdk8Methods.requireNonNull(offset, "offset"); // protect against bad ZoneRules
LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
@SuppressWarnings("unchecked")
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
*/
private ChronoZonedDateTimeImpl create(Instant instant, ZoneId zone) {
return ofInstant(toLocalDate().getChronology(), instant, zone);
}
//-----------------------------------------------------------------------
/**
* 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 dateTime, ZoneOffset offset, ZoneId zone) {
this.dateTime = Jdk8Methods.requireNonNull(dateTime, "dateTime");
this.offset = Jdk8Methods.requireNonNull(offset, "offset");
this.zone = Jdk8Methods.requireNonNull(zone, "zone");
}
//-----------------------------------------------------------------------
@Override
public boolean isSupported(TemporalUnit unit) {
if (unit instanceof ChronoUnit) {
return unit.isDateBased() || unit.isTimeBased();
}
return unit != null && unit.isSupportedBy(this);
}
public ZoneOffset getOffset() {
return offset;
}
@Override
public ChronoZonedDateTime 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 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 toLocalDateTime() {
return dateTime;
}
public ZoneId getZone() {
return zone;
}
public ChronoZonedDateTime withZoneSameLocal(ZoneId zone) {
return ofBest(dateTime, zone, offset);
}
@Override
public ChronoZonedDateTime withZoneSameInstant(ZoneId zone) {
Jdk8Methods.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 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 toLocalDate().getChronology().ensureChronoZonedDateTime(field.adjustInto(this, newValue));
}
//-----------------------------------------------------------------------
@Override
public ChronoZonedDateTime plus(long amountToAdd, TemporalUnit unit) {
if (unit instanceof ChronoUnit) {
return with(dateTime.plus(amountToAdd, unit));
}
return toLocalDate().getChronology().ensureChronoZonedDateTime(unit.addTo(this, amountToAdd)); /// TODO: Generics replacement Risk!
}
//-----------------------------------------------------------------------
@Override
public long until(Temporal endExclusive, TemporalUnit unit) {
@SuppressWarnings("unchecked")
ChronoZonedDateTime end = (ChronoZonedDateTime) toLocalDate().getChronology().zonedDateTime(endExclusive);
if (unit instanceof ChronoUnit) {
end = end.withZoneSameInstant(offset);
return dateTime.until(end.toLocalDateTime(), unit);
}
return unit.between(this, end);
}
//-----------------------------------------------------------------------
private Object writeReplace() {
return new Ser(Ser.CHRONO_ZONEDDATETIME_TYPE, this);
}
/**
* Defend against malicious streams.
* @return never
* @throws InvalidObjectException always
*/
private Object readResolve() throws ObjectStreamException {
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;
}
}