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ZonedDateTime.java
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2247 lines (2153 loc) · 102 KB
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/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
/*
*
*
*
*
*
* 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 java.time;
import static java.time.temporal.ChronoField.INSTANT_SECONDS;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoField.OFFSET_SECONDS;
import java.io.DataOutput;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.chrono.ChronoZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
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 ISO-8601 calendar system,
* such as {@code 2007-12-03T10:15:30+01:00 Europe/Paris}.
* <p>
* {@code ZonedDateTime} 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,
* and a time-zone, with a zone offset used to handle ambiguous local date-times.
* For example, the value
* "2nd October 2007 at 13:45.30.123456789 +02:00 in the Europe/Paris time-zone"
* can be stored in a {@code ZonedDateTime}.
* <p>
* This class handles conversion from the local time-line of {@code LocalDateTime}
* to the instant time-line of {@code Instant}.
* The difference between the two time-lines is the offset from UTC/Greenwich,
* represented by a {@code ZoneOffset}.
* <p>
* Converting between the two time-lines involves calculating the offset using the
* {@link ZoneRules rules} accessed from the {@code ZoneId}.
* Obtaining the offset for an instant is simple, as there is exactly one valid
* offset for each instant. By contrast, obtaining the offset for a local date-time
* is not straightforward. There are three cases:
* <ul>
* <li>Normal, with one valid offset. For the vast majority of the year, the normal
* case applies, where there is a single valid offset for the local date-time.</li>
* <li>Gap, with zero valid offsets. This is when clocks jump forward typically
* due to the spring daylight savings change from "winter" to "summer".
* In a gap there are local date-time values with no valid offset.</li>
* <li>Overlap, with two valid offsets. This is when clocks are set back typically
* due to the autumn daylight savings change from "summer" to "winter".
* In an overlap there are local date-time values with two valid offsets.</li>
* </ul>
* <p>
* Any method that converts directly or implicitly from a local date-time to an
* instant by obtaining the offset has the potential to be complicated.
* <p>
* For Gaps, the general strategy is that if the local date-time falls in the
* middle of a Gap, then the resulting zoned date-time will have a local date-time
* shifted forwards by the length of the Gap, resulting in a date-time in the later
* offset, typically "summer" time.
* <p>
* For Overlaps, the general strategy is that if the local date-time falls in the
* middle of an Overlap, then the previous offset will be retained. If there is no
* previous offset, or the previous offset is invalid, then the earlier offset is
* used, typically "summer" time.. Two additional methods,
* {@link #withEarlierOffsetAtOverlap()} and {@link #withLaterOffsetAtOverlap()},
* help manage the case of an overlap.
* <p>
* In terms of design, this class should be viewed primarily as the combination
* of a {@code LocalDateTime} and a {@code ZoneId}. The {@code ZoneOffset} is
* a vital, but secondary, piece of information, used to ensure that the class
* represents an instant, especially during a daylight savings overlap.
*
* <p>
* This is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based</a>
* class; use of identity-sensitive operations (including reference equality
* ({@code ==}), identity hash code, or synchronization) on instances of
* {@code ZonedDateTime} may have unpredictable results and should be avoided.
* The {@code equals} method should be used for comparisons.
*
* @implSpec
* A {@code ZonedDateTime} holds state equivalent to three separate objects,
* a {@code LocalDateTime}, a {@code ZoneId} and the resolved {@code ZoneOffset}.
* The offset and local date-time are used to define an instant when necessary.
* The zone ID is used to obtain the rules for how and when the offset changes.
* The offset cannot be freely set, as the zone controls which offsets are valid.
* <p>
* This class is immutable and thread-safe.
*
* @since 1.8
*/
public final class ZonedDateTime
implements Temporal, ChronoZonedDateTime<LocalDate>, Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = -6260982410461394882L;
/**
* The local date-time.
*/
private final LocalDateTime dateTime;
/**
* The offset from UTC/Greenwich.
*/
private final ZoneOffset offset;
/**
* The time-zone.
*/
private final ZoneId zone;
//-----------------------------------------------------------------------
/**
* Obtains the current date-time from the system clock in the default time-zone.
* <p>
* This will query the {@link Clock#systemDefaultZone() system clock} in the default
* time-zone to obtain the current date-time.
* The zone and offset will be set based on the time-zone in the clock.
* <p>
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
*
* @return the current date-time using the system clock, not null
*/
public static ZonedDateTime now() {
return now(Clock.systemDefaultZone());
}
/**
* Obtains the current date-time from the system clock in the specified time-zone.
* <p>
* This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
* Specifying the time-zone avoids dependence on the default time-zone.
* The offset will be calculated from the specified time-zone.
* <p>
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
*
* @param zone the zone ID to use, not null
* @return the current date-time using the system clock, not null
*/
public static ZonedDateTime now(ZoneId zone) {
return now(Clock.system(zone));
}
/**
* Obtains the current date-time from the specified clock.
* <p>
* This will query the specified clock to obtain the current date-time.
* The zone and offset will be set based on the time-zone in the clock.
* <p>
* Using this method allows the use of an alternate clock for testing.
* The alternate clock may be introduced using {@link Clock dependency injection}.
*
* @param clock the clock to use, not null
* @return the current date-time, not null
*/
public static ZonedDateTime now(Clock clock) {
Objects.requireNonNull(clock, "clock");
final Instant now = clock.instant(); // called once
return ofInstant(now, clock.getZone());
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code ZonedDateTime} from a local date and time.
* <p>
* This creates a zoned date-time matching the input local date and time as closely as possible.
* Time-zone rules, such as daylight savings, mean that not every local date-time
* is valid for the specified zone, thus the local date-time may be adjusted.
* <p>
* The local date time and first combined to form a local date-time.
* The local date-time is then resolved to a single instant on the time-line.
* This is achieved by finding a valid offset from UTC/Greenwich for the local
* date-time as defined by the {@link ZoneRules rules} of the zone ID.
*<p>
* In most cases, there is only one valid offset for a local date-time.
* In the case of an overlap, when clocks are set back, there are two valid offsets.
* This method uses the earlier offset typically corresponding to "summer".
* <p>
* In the case of a gap, when clocks jump forward, there is no valid offset.
* Instead, the local date-time is adjusted to be later by the length of the gap.
* For a typical one hour daylight savings change, the local date-time will be
* moved one hour later into the offset typically corresponding to "summer".
*
* @param date the local date, not null
* @param time the local time, not null
* @param zone the time-zone, not null
* @return the offset date-time, not null
*/
public static ZonedDateTime of(LocalDate date, LocalTime time, ZoneId zone) {
return of(LocalDateTime.of(date, time), zone);
}
/**
* Obtains an instance of {@code ZonedDateTime} from a local date-time.
* <p>
* This creates a zoned date-time matching the input local date-time as closely as possible.
* Time-zone rules, such as daylight savings, mean that not every local date-time
* is valid for the specified zone, thus the local date-time may be adjusted.
* <p>
* The local date-time is resolved to a single instant on the time-line.
* This is achieved by finding a valid offset from UTC/Greenwich for the local
* date-time as defined by the {@link ZoneRules rules} of the zone ID.
*<p>
* In most cases, there is only one valid offset for a local date-time.
* In the case of an overlap, when clocks are set back, there are two valid offsets.
* This method uses the earlier offset typically corresponding to "summer".
* <p>
* In the case of a gap, when clocks jump forward, there is no valid offset.
* Instead, the local date-time is adjusted to be later by the length of the gap.
* For a typical one hour daylight savings change, the local date-time will be
* moved one hour later into the offset typically corresponding to "summer".
*
* @param localDateTime the local date-time, not null
* @param zone the time-zone, not null
* @return the zoned date-time, not null
*/
public static ZonedDateTime of(LocalDateTime localDateTime, ZoneId zone) {
return ofLocal(localDateTime, zone, null);
}
/**
* Obtains an instance of {@code ZonedDateTime} from a year, month, day,
* hour, minute, second, nanosecond and time-zone.
* <p>
* This creates a zoned date-time matching the local date-time of the seven
* specified fields as closely as possible.
* Time-zone rules, such as daylight savings, mean that not every local date-time
* is valid for the specified zone, thus the local date-time may be adjusted.
* <p>
* The local date-time is resolved to a single instant on the time-line.
* This is achieved by finding a valid offset from UTC/Greenwich for the local
* date-time as defined by the {@link ZoneRules rules} of the zone ID.
*<p>
* In most cases, there is only one valid offset for a local date-time.
* In the case of an overlap, when clocks are set back, there are two valid offsets.
* This method uses the earlier offset typically corresponding to "summer".
* <p>
* In the case of a gap, when clocks jump forward, there is no valid offset.
* Instead, the local date-time is adjusted to be later by the length of the gap.
* For a typical one hour daylight savings change, the local date-time will be
* moved one hour later into the offset typically corresponding to "summer".
* <p>
* This method exists primarily for writing test cases.
* Non test-code will typically use other methods to create an offset time.
* {@code LocalDateTime} has five additional convenience variants of the
* equivalent factory method taking fewer arguments.
* They are not provided here to reduce the footprint of the API.
*
* @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
* @param hour the hour-of-day to represent, from 0 to 23
* @param minute the minute-of-hour to represent, from 0 to 59
* @param second the second-of-minute to represent, from 0 to 59
* @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
* @param zone the time-zone, not null
* @return the offset date-time, not null
* @throws DateTimeException if the value of any field is out of range, or
* if the day-of-month is invalid for the month-year
*/
public static ZonedDateTime of(
int year, int month, int dayOfMonth,
int hour, int minute, int second, int nanoOfSecond, ZoneId zone) {
LocalDateTime dt = LocalDateTime.of(year, month, dayOfMonth, hour, minute, second, nanoOfSecond);
return ofLocal(dt, zone, null);
}
/**
* Obtains an instance of {@code ZonedDateTime} from a local date-time
* using the preferred offset if possible.
* <p>
* The local date-time is resolved to a single instant on the time-line.
* This is achieved by finding a valid offset from UTC/Greenwich for the local
* date-time as defined by the {@link ZoneRules rules} of the zone ID.
*<p>
* In most cases, there is only one valid offset for a local date-time.
* In the case of an overlap, where clocks are set back, there are two valid offsets.
* If the preferred offset is one of the valid offsets then it is used.
* Otherwise the earlier valid offset is used, typically corresponding to "summer".
* <p>
* In the case of a gap, where clocks jump forward, there is no valid offset.
* Instead, the local date-time is adjusted to be later by the length of the gap.
* For a typical one hour daylight savings change, the local date-time will be
* moved one hour later into the offset typically corresponding to "summer".
*
* @param localDateTime the local date-time, not null
* @param zone the time-zone, not null
* @param preferredOffset the zone offset, null if no preference
* @return the zoned date-time, not null
*/
public static ZonedDateTime ofLocal(LocalDateTime localDateTime, ZoneId zone, ZoneOffset preferredOffset) {
Objects.requireNonNull(localDateTime, "localDateTime");
Objects.requireNonNull(zone, "zone");
if (zone instanceof ZoneOffset) {
return new ZonedDateTime(localDateTime, (ZoneOffset) zone, zone);
}
ZoneRules rules = zone.getRules();
List<ZoneOffset> validOffsets = rules.getValidOffsets(localDateTime);
ZoneOffset offset;
if (validOffsets.size() == 1) {
offset = validOffsets.get(0);
} else if (validOffsets.size() == 0) {
ZoneOffsetTransition trans = rules.getTransition(localDateTime);
localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
offset = trans.getOffsetAfter();
} else {
if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
offset = preferredOffset;
} else {
offset = Objects.requireNonNull(validOffsets.get(0), "offset"); // protect against bad ZoneRules
}
}
return new ZonedDateTime(localDateTime, offset, zone);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code ZonedDateTime} from an {@code Instant}.
* <p>
* This creates a zoned date-time with the same instant as that specified.
* Calling {@link #toInstant()} will return an instant equal to the one used here.
* <p>
* Converting an instant to a zoned date-time is simple as there is only one valid
* offset for each instant.
*
* @param instant the instant to create the date-time from, not null
* @param zone the time-zone, not null
* @return the zoned date-time, not null
* @throws DateTimeException if the result exceeds the supported range
*/
public static ZonedDateTime ofInstant(Instant instant, ZoneId zone) {
Objects.requireNonNull(instant, "instant");
Objects.requireNonNull(zone, "zone");
return create(instant.getEpochSecond(), instant.getNano(), zone);
}
/**
* Obtains an instance of {@code ZonedDateTime} from the instant formed by combining
* the local date-time and offset.
* <p>
* This creates a zoned date-time by {@link LocalDateTime#toInstant(ZoneOffset) combining}
* the {@code LocalDateTime} and {@code ZoneOffset}.
* This combination uniquely specifies an instant without ambiguity.
* <p>
* Converting an instant to a zoned date-time is simple as there is only one valid
* offset for each instant. If the valid offset is different to the offset specified,
* the the date-time and offset of the zoned date-time will differ from those specified.
* <p>
* If the {@code ZoneId} to be used is a {@code ZoneOffset}, this method is equivalent
* to {@link #of(LocalDateTime, ZoneId)}.
*
* @param localDateTime the local date-time, not null
* @param offset the zone offset, not null
* @param zone the time-zone, not null
* @return the zoned date-time, not null
*/
public static ZonedDateTime ofInstant(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
Objects.requireNonNull(localDateTime, "localDateTime");
Objects.requireNonNull(offset, "offset");
Objects.requireNonNull(zone, "zone");
if (zone.getRules().isValidOffset(localDateTime, offset)) {
return new ZonedDateTime(localDateTime, offset, zone);
}
return create(localDateTime.toEpochSecond(offset), localDateTime.getNano(), zone);
}
/**
* Obtains an instance of {@code ZonedDateTime} using seconds from the
* epoch of 1970-01-01T00:00:00Z.
*
* @param epochSecond the number of seconds from the epoch of 1970-01-01T00:00:00Z
* @param nanoOfSecond the nanosecond within the second, from 0 to 999,999,999
* @param zone the time-zone, not null
* @return the zoned date-time, not null
* @throws DateTimeException if the result exceeds the supported range
*/
private static ZonedDateTime create(long epochSecond, int nanoOfSecond, ZoneId zone) {
ZoneRules rules = zone.getRules();
Instant instant = Instant.ofEpochSecond(epochSecond, nanoOfSecond); // TODO: rules should be queryable by epochSeconds
ZoneOffset offset = rules.getOffset(instant);
LocalDateTime ldt = LocalDateTime.ofEpochSecond(epochSecond, nanoOfSecond, offset);
return new ZonedDateTime(ldt, offset, zone);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code ZonedDateTime} strictly validating the
* combination of local date-time, offset and zone ID.
* <p>
* This creates a zoned date-time ensuring that the offset is valid for the
* local date-time according to the rules of the specified zone.
* If the offset is invalid, an exception is thrown.
*
* @param localDateTime the local date-time, not null
* @param offset the zone offset, not null
* @param zone the time-zone, not null
* @return the zoned date-time, not null
*/
public static ZonedDateTime ofStrict(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
Objects.requireNonNull(localDateTime, "localDateTime");
Objects.requireNonNull(offset, "offset");
Objects.requireNonNull(zone, "zone");
ZoneRules rules = zone.getRules();
if (rules.isValidOffset(localDateTime, offset) == false) {
ZoneOffsetTransition trans = rules.getTransition(localDateTime);
if (trans != null && trans.isGap()) {
// error message says daylight savings for simplicity
// even though there are other kinds of gaps
throw new DateTimeException("LocalDateTime '" + localDateTime +
"' does not exist in zone '" + zone +
"' due to a gap in the local time-line, typically caused by daylight savings");
}
throw new DateTimeException("ZoneOffset '" + offset + "' is not valid for LocalDateTime '" +
localDateTime + "' in zone '" + zone + "'");
}
return new ZonedDateTime(localDateTime, offset, zone);
}
/**
* Obtains an instance of {@code ZonedDateTime} leniently, for advanced use cases,
* allowing any combination of local date-time, offset and zone ID.
* <p>
* This creates a zoned date-time with no checks other than no nulls.
* This means that the resulting zoned date-time may have an offset that is in conflict
* with the zone ID.
* <p>
* This method is intended for advanced use cases.
* For example, consider the case where a zoned date-time with valid fields is created
* and then stored in a database or serialization-based store. At some later point,
* the object is then re-loaded. However, between those points in time, the government
* that defined the time-zone has changed the rules, such that the originally stored
* local date-time now does not occur. This method can be used to create the object
* in an "invalid" state, despite the change in rules.
*
* @param localDateTime the local date-time, not null
* @param offset the zone offset, not null
* @param zone the time-zone, not null
* @return the zoned date-time, not null
*/
private static ZonedDateTime ofLenient(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
Objects.requireNonNull(localDateTime, "localDateTime");
Objects.requireNonNull(offset, "offset");
Objects.requireNonNull(zone, "zone");
if (zone instanceof ZoneOffset && offset.equals(zone) == false) {
throw new IllegalArgumentException("ZoneId must match ZoneOffset");
}
return new ZonedDateTime(localDateTime, offset, zone);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code ZonedDateTime} from a temporal object.
* <p>
* This obtains a zoned date-time based on the specified temporal.
* A {@code TemporalAccessor} represents an arbitrary set of date and time information,
* which this factory converts to an instance of {@code ZonedDateTime}.
* <p>
* The conversion will first obtain a {@code ZoneId} from the temporal object,
* falling back to a {@code ZoneOffset} if necessary. It will then try to obtain
* an {@code Instant}, falling back to a {@code LocalDateTime} if necessary.
* The result will be either the combination of {@code ZoneId} or {@code ZoneOffset}
* with {@code Instant} or {@code LocalDateTime}.
* Implementations are permitted to perform optimizations such as accessing
* those fields that are equivalent to the relevant objects.
* <p>
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used in queries via method reference, {@code ZonedDateTime::from}.
*
* @param temporal the temporal object to convert, not null
* @return the zoned date-time, not null
* @throws DateTimeException if unable to convert to an {@code ZonedDateTime}
*/
public static ZonedDateTime from(TemporalAccessor temporal) {
if (temporal instanceof ZonedDateTime) {
return (ZonedDateTime) temporal;
}
try {
ZoneId zone = ZoneId.from(temporal);
try {
long epochSecond = temporal.getLong(INSTANT_SECONDS);
int nanoOfSecond = temporal.get(NANO_OF_SECOND);
return create(epochSecond, nanoOfSecond, zone);
} catch (DateTimeException ex1) {
LocalDateTime ldt = LocalDateTime.from(temporal);
return of(ldt, zone);
}
} catch (DateTimeException ex) {
throw new DateTimeException("Unable to obtain ZonedDateTime from TemporalAccessor: " +
temporal + " of type " + temporal.getClass().getName(), ex);
}
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code ZonedDateTime} from a text string such as
* {@code 2007-12-03T10:15:30+01:00[Europe/Paris]}.
* <p>
* The string must represent a valid date-time and is parsed using
* {@link java.time.format.DateTimeFormatter#ISO_ZONED_DATE_TIME}.
*
* @param text the text to parse such as "2007-12-03T10:15:30+01:00[Europe/Paris]", not null
* @return the parsed zoned date-time, not null
* @throws DateTimeParseException if the text cannot be parsed
*/
public static ZonedDateTime parse(CharSequence text) {
return parse(text, DateTimeFormatter.ISO_ZONED_DATE_TIME);
}
/**
* Obtains an instance of {@code ZonedDateTime} from a text string using a specific formatter.
* <p>
* The text is parsed using the formatter, returning a date-time.
*
* @param text the text to parse, not null
* @param formatter the formatter to use, not null
* @return the parsed zoned date-time, not null
* @throws DateTimeParseException if the text cannot be parsed
*/
public static ZonedDateTime parse(CharSequence text, DateTimeFormatter formatter) {
Objects.requireNonNull(formatter, "formatter");
return formatter.parse(text, ZonedDateTime::from);
}
//-----------------------------------------------------------------------
/**
* Constructor.
*
* @param dateTime the date-time, validated as not null
* @param offset the zone offset, validated as not null
* @param zone the time-zone, validated as not null
*/
private ZonedDateTime(LocalDateTime dateTime, ZoneOffset offset, ZoneId zone) {
this.dateTime = dateTime;
this.offset = offset;
this.zone = zone;
}
/**
* Resolves the new local date-time using this zone ID, retaining the offset if possible.
*
* @param newDateTime the new local date-time, not null
* @return the zoned date-time, not null
*/
private ZonedDateTime resolveLocal(LocalDateTime newDateTime) {
return ofLocal(newDateTime, zone, offset);
}
/**
* Resolves the new local date-time using the offset to identify the instant.
*
* @param newDateTime the new local date-time, not null
* @return the zoned date-time, not null
*/
private ZonedDateTime resolveInstant(LocalDateTime newDateTime) {
return ofInstant(newDateTime, offset, zone);
}
/**
* Resolves the offset into this zoned date-time for the with methods.
* <p>
* This typically ignores the offset, unless it can be used to switch offset in a DST overlap.
*
* @param offset the offset, not null
* @return the zoned date-time, not null
*/
private ZonedDateTime resolveOffset(ZoneOffset offset) {
if (offset.equals(this.offset) == false && zone.getRules().isValidOffset(dateTime, offset)) {
return new ZonedDateTime(dateTime, offset, zone);
}
return this;
}
//-----------------------------------------------------------------------
/**
* Checks if the specified field is supported.
* <p>
* This checks if this date-time can be queried for the specified field.
* If false, then calling the {@link #range(TemporalField) range},
* {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
* methods will throw an exception.
* <p>
* If the field is a {@link ChronoField} then the query is implemented here.
* The supported fields are:
* <ul>
* <li>{@code NANO_OF_SECOND}
* <li>{@code NANO_OF_DAY}
* <li>{@code MICRO_OF_SECOND}
* <li>{@code MICRO_OF_DAY}
* <li>{@code MILLI_OF_SECOND}
* <li>{@code MILLI_OF_DAY}
* <li>{@code SECOND_OF_MINUTE}
* <li>{@code SECOND_OF_DAY}
* <li>{@code MINUTE_OF_HOUR}
* <li>{@code MINUTE_OF_DAY}
* <li>{@code HOUR_OF_AMPM}
* <li>{@code CLOCK_HOUR_OF_AMPM}
* <li>{@code HOUR_OF_DAY}
* <li>{@code CLOCK_HOUR_OF_DAY}
* <li>{@code AMPM_OF_DAY}
* <li>{@code DAY_OF_WEEK}
* <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
* <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
* <li>{@code DAY_OF_MONTH}
* <li>{@code DAY_OF_YEAR}
* <li>{@code EPOCH_DAY}
* <li>{@code ALIGNED_WEEK_OF_MONTH}
* <li>{@code ALIGNED_WEEK_OF_YEAR}
* <li>{@code MONTH_OF_YEAR}
* <li>{@code PROLEPTIC_MONTH}
* <li>{@code YEAR_OF_ERA}
* <li>{@code YEAR}
* <li>{@code ERA}
* <li>{@code INSTANT_SECONDS}
* <li>{@code OFFSET_SECONDS}
* </ul>
* All other {@code ChronoField} instances will return false.
* <p>
* If the field is not a {@code ChronoField}, then the result of this method
* is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
* passing {@code this} as the argument.
* Whether the field is supported is determined by the field.
*
* @param field the field to check, null returns false
* @return true if the field is supported on this date-time, false if not
*/
@Override
public boolean isSupported(TemporalField field) {
return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
}
/**
* Checks if the specified unit is supported.
* <p>
* This checks if the specified unit can be added to, or subtracted from, this date-time.
* If false, then calling the {@link #plus(long, TemporalUnit)} and
* {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
* <p>
* If the unit is a {@link ChronoUnit} then the query is implemented here.
* The supported units are:
* <ul>
* <li>{@code NANOS}
* <li>{@code MICROS}
* <li>{@code MILLIS}
* <li>{@code SECONDS}
* <li>{@code MINUTES}
* <li>{@code HOURS}
* <li>{@code HALF_DAYS}
* <li>{@code DAYS}
* <li>{@code WEEKS}
* <li>{@code MONTHS}
* <li>{@code YEARS}
* <li>{@code DECADES}
* <li>{@code CENTURIES}
* <li>{@code MILLENNIA}
* <li>{@code ERAS}
* </ul>
* All other {@code ChronoUnit} instances will return false.
* <p>
* If the unit is not a {@code ChronoUnit}, then the result of this method
* is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
* passing {@code this} as the argument.
* Whether the unit is supported is determined by the unit.
*
* @param unit the unit to check, null returns false
* @return true if the unit can be added/subtracted, false if not
*/
@Override // override for Javadoc
public boolean isSupported(TemporalUnit unit) {
return ChronoZonedDateTime.super.isSupported(unit);
}
//-----------------------------------------------------------------------
/**
* Gets the range of valid values for the specified field.
* <p>
* The range object expresses the minimum and maximum valid values for a field.
* This date-time is used to enhance the accuracy of the returned range.
* If it is not possible to return the range, because the field is not supported
* or for some other reason, an exception is thrown.
* <p>
* If the field is a {@link ChronoField} then the query is implemented here.
* The {@link #isSupported(TemporalField) supported fields} will return
* appropriate range instances.
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
* <p>
* If the field is not a {@code ChronoField}, then the result of this method
* is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
* passing {@code this} as the argument.
* Whether the range can be obtained is determined by the field.
*
* @param field the field to query the range for, not null
* @return the range of valid values for the field, not null
* @throws DateTimeException if the range for the field cannot be obtained
* @throws UnsupportedTemporalTypeException if the field is not supported
*/
@Override
public ValueRange range(TemporalField field) {
if (field instanceof ChronoField) {
if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {
return field.range();
}
return dateTime.range(field);
}
return field.rangeRefinedBy(this);
}
/**
* Gets the value of the specified field from this date-time as an {@code int}.
* <p>
* This queries this date-time for the value for the specified field.
* The returned value will always be within the valid range of values for the field.
* If it is not possible to return the value, because the field is not supported
* or for some other reason, an exception is thrown.
* <p>
* If the field is a {@link ChronoField} then the query is implemented here.
* The {@link #isSupported(TemporalField) supported fields} will return valid
* values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
* {@code EPOCH_DAY}, {@code PROLEPTIC_MONTH} and {@code INSTANT_SECONDS} which are too
* large to fit in an {@code int} and throw a {@code DateTimeException}.
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
* <p>
* If the field is not a {@code ChronoField}, then the result of this method
* is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
* passing {@code this} as the argument. Whether the value can be obtained,
* and what the value represents, is determined by the field.
*
* @param field the field to get, not null
* @return the value for the field
* @throws DateTimeException if a value for the field cannot be obtained or
* the value is outside the range of valid values for the field
* @throws UnsupportedTemporalTypeException if the field is not supported or
* the range of values exceeds an {@code int}
* @throws ArithmeticException if numeric overflow occurs
*/
@Override // override for Javadoc and performance
public int get(TemporalField field) {
if (field instanceof ChronoField) {
switch ((ChronoField) field) {
case INSTANT_SECONDS:
throw new UnsupportedTemporalTypeException("Invalid field 'InstantSeconds' for get() method, use getLong() instead");
case OFFSET_SECONDS:
return getOffset().getTotalSeconds();
}
return dateTime.get(field);
}
return ChronoZonedDateTime.super.get(field);
}
/**
* Gets the value of the specified field from this date-time as a {@code long}.
* <p>
* This queries this date-time for the value for the specified field.
* If it is not possible to return the value, because the field is not supported
* or for some other reason, an exception is thrown.
* <p>
* If the field is a {@link ChronoField} then the query is implemented here.
* The {@link #isSupported(TemporalField) supported fields} will return valid
* values based on this date-time.
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
* <p>
* If the field is not a {@code ChronoField}, then the result of this method
* is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
* passing {@code this} as the argument. Whether the value can be obtained,
* and what the value represents, is determined by the field.
*
* @param field the field to get, not null
* @return the value for the field
* @throws DateTimeException if a value for the field cannot be obtained
* @throws UnsupportedTemporalTypeException if the field is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public long getLong(TemporalField field) {
if (field instanceof ChronoField) {
switch ((ChronoField) field) {
case INSTANT_SECONDS: return toEpochSecond();
case OFFSET_SECONDS: return getOffset().getTotalSeconds();
}
return dateTime.getLong(field);
}
return field.getFrom(this);
}
//-----------------------------------------------------------------------
/**
* Gets the zone offset, such as '+01:00'.
* <p>
* This is the offset of the local date-time from UTC/Greenwich.
*
* @return the zone offset, not null
*/
@Override
public ZoneOffset getOffset() {
return offset;
}
/**
* Returns a copy of this date-time changing the zone offset to the
* earlier of the two valid offsets at a local time-line overlap.
* <p>
* This method only has any effect when the local time-line overlaps, such as
* at an autumn daylight savings cutover. In this scenario, there are two
* valid offsets for the local date-time. Calling this method will return
* a zoned date-time with the earlier of the two selected.
* <p>
* If this method is called when it is not an overlap, {@code this}
* is returned.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return a {@code ZonedDateTime} based on this date-time with the earlier offset, not null
*/
@Override
public ZonedDateTime withEarlierOffsetAtOverlap() {
ZoneOffsetTransition trans = getZone().getRules().getTransition(dateTime);
if (trans != null && trans.isOverlap()) {
ZoneOffset earlierOffset = trans.getOffsetBefore();
if (earlierOffset.equals(offset) == false) {
return new ZonedDateTime(dateTime, earlierOffset, zone);
}
}
return this;
}
/**
* Returns a copy of this date-time changing the zone offset to the
* later of the two valid offsets at a local time-line overlap.
* <p>
* This method only has any effect when the local time-line overlaps, such as
* at an autumn daylight savings cutover. In this scenario, there are two
* valid offsets for the local date-time. Calling this method will return
* a zoned date-time with the later of the two selected.
* <p>
* If this method is called when it is not an overlap, {@code this}
* is returned.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return a {@code ZonedDateTime} based on this date-time with the later offset, not null
*/
@Override
public ZonedDateTime withLaterOffsetAtOverlap() {
ZoneOffsetTransition trans = getZone().getRules().getTransition(toLocalDateTime());
if (trans != null) {
ZoneOffset laterOffset = trans.getOffsetAfter();
if (laterOffset.equals(offset) == false) {
return new ZonedDateTime(dateTime, laterOffset, zone);
}
}
return this;
}
//-----------------------------------------------------------------------
/**
* Gets the time-zone, such as 'Europe/Paris'.
* <p>
* This returns the zone ID. This identifies the time-zone {@link ZoneRules rules}
* that determine when and how the offset from UTC/Greenwich changes.
* <p>
* The zone ID may be same as the {@linkplain #getOffset() offset}.
* If this is true, then any future calculations, such as addition or subtraction,
* have no complex edge cases due to time-zone rules.
* See also {@link #withFixedOffsetZone()}.
*
* @return the time-zone, not null
*/
@Override
public ZoneId getZone() {
return zone;
}
/**
* Returns a copy of this date-time with a different time-zone,
* retaining the local date-time if possible.
* <p>
* This method changes the time-zone and retains the local date-time.
* The local date-time is only changed if it is invalid for the new zone,
* determined using the same approach as
* {@link #ofLocal(LocalDateTime, ZoneId, ZoneOffset)}.
* <p>
* To change the zone and adjust the local date-time,
* use {@link #withZoneSameInstant(ZoneId)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param zone the time-zone to change to, not null
* @return a {@code ZonedDateTime} based on this date-time with the requested zone, not null
*/
@Override
public ZonedDateTime withZoneSameLocal(ZoneId zone) {
Objects.requireNonNull(zone, "zone");
return this.zone.equals(zone) ? this : ofLocal(dateTime, zone, offset);
}
/**
* Returns a copy of this date-time with a different time-zone,
* retaining the instant.
* <p>
* This method changes the time-zone and retains the instant.
* This normally results in a change to the local date-time.
* <p>
* This method is based on retaining the same instant, thus gaps and overlaps
* in the local time-line have no effect on the result.
* <p>
* To change the offset while keeping the local time,
* use {@link #withZoneSameLocal(ZoneId)}.
*
* @param zone the time-zone to change to, not null
* @return a {@code ZonedDateTime} based on this date-time with the requested zone, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
@Override
public ZonedDateTime withZoneSameInstant(ZoneId zone) {
Objects.requireNonNull(zone, "zone");
return this.zone.equals(zone) ? this :
create(dateTime.toEpochSecond(offset), dateTime.getNano(), zone);
}
/**
* Returns a copy of this date-time with the zone ID set to the offset.
* <p>
* This returns a zoned date-time where the zone ID is the same as {@link #getOffset()}.
* The local date-time, offset and instant of the result will be the same as in this date-time.
* <p>
* Setting the date-time to a fixed single offset means that any future