JDK8/Java8源码在线阅读
/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* 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.LocalTime.NANOS_PER_SECOND;
import static java.time.LocalTime.SECONDS_PER_DAY;
import static java.time.LocalTime.SECONDS_PER_HOUR;
import static java.time.LocalTime.SECONDS_PER_MINUTE;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoUnit.DAYS;
import static java.time.temporal.ChronoUnit.NANOS;
import static java.time.temporal.ChronoUnit.SECONDS;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A time-based amount of time, such as '34.5 seconds'.
* <p>
* This class models a quantity or amount of time in terms of seconds and nanoseconds.
* It can be accessed using other duration-based units, such as minutes and hours.
* In addition, the {@link ChronoUnit#DAYS DAYS} unit can be used and is treated as
* exactly equal to 24 hours, thus ignoring daylight savings effects.
* See {@link Period} for the date-based equivalent to this class.
* <p>
* A physical duration could be of infinite length.
* For practicality, the duration is stored with constraints similar to {@link Instant}.
* The duration uses nanosecond resolution with a maximum value of the seconds that can
* be held in a {@code long}. This is greater than the current estimated age of the universe.
* <p>
* The range of a duration requires the storage of a number larger than a {@code long}.
* To achieve this, the class stores a {@code long} representing seconds and an {@code int}
* representing nanosecond-of-second, which will always be between 0 and 999,999,999.
* The model is of a directed duration, meaning that the duration may be negative.
* <p>
* The duration is measured in "seconds", but these are not necessarily identical to
* the scientific "SI second" definition based on atomic clocks.
* This difference only impacts durations measured near a leap-second and should not affect
* most applications.
* See {@link Instant} for a discussion as to the meaning of the second and time-scales.
*
* <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 Duration} may have unpredictable results and should be avoided.
* The {@code equals} method should be used for comparisons.
*
* @implSpec
* This class is immutable and thread-safe.
*
* @since 1.8
*/
public final class Duration
implements TemporalAmount, Comparable<Duration>, Serializable {
/**
* Constant for a duration of zero.
*/
public static final Duration ZERO = new Duration(0, 0);
/**
* Serialization version.
*/
private static final long serialVersionUID = 3078945930695997490L;
/**
* Constant for nanos per second.
*/
private static final BigInteger BI_NANOS_PER_SECOND = BigInteger.valueOf(NANOS_PER_SECOND);
/**
* The pattern for parsing.
*/
private static final Pattern PATTERN =
Pattern.compile("([-+]?)P(?:([-+]?[0-9]+)D)?" +
"(T(?:([-+]?[0-9]+)H)?(?:([-+]?[0-9]+)M)?(?:([-+]?[0-9]+)(?:[.,]([0-9]{0,9}))?S)?)?",
Pattern.CASE_INSENSITIVE);
/**
* The number of seconds in the duration.
*/
private final long seconds;
/**
* The number of nanoseconds in the duration, expressed as a fraction of the
* number of seconds. This is always positive, and never exceeds 999,999,999.
*/
private final int nanos;
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} representing a number of standard 24 hour days.
* <p>
* The seconds are calculated based on the standard definition of a day,
* where each day is 86400 seconds which implies a 24 hour day.
* The nanosecond in second field is set to zero.
*
* @param days the number of days, positive or negative
* @return a {@code Duration}, not null
* @throws ArithmeticException if the input days exceeds the capacity of {@code Duration}
*/
public static Duration ofDays(long days) {
return create(Math.multiplyExact(days, SECONDS_PER_DAY), 0);
}
/**
* Obtains a {@code Duration} representing a number of standard hours.
* <p>
* The seconds are calculated based on the standard definition of an hour,
* where each hour is 3600 seconds.
* The nanosecond in second field is set to zero.
*
* @param hours the number of hours, positive or negative
* @return a {@code Duration}, not null
* @throws ArithmeticException if the input hours exceeds the capacity of {@code Duration}
*/
public static Duration ofHours(long hours) {
return create(Math.multiplyExact(hours, SECONDS_PER_HOUR), 0);
}
/**
* Obtains a {@code Duration} representing a number of standard minutes.
* <p>
* The seconds are calculated based on the standard definition of a minute,
* where each minute is 60 seconds.
* The nanosecond in second field is set to zero.
*
* @param minutes the number of minutes, positive or negative
* @return a {@code Duration}, not null
* @throws ArithmeticException if the input minutes exceeds the capacity of {@code Duration}
*/
public static Duration ofMinutes(long minutes) {
return create(Math.multiplyExact(minutes, SECONDS_PER_MINUTE), 0);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} representing a number of seconds.
* <p>
* The nanosecond in second field is set to zero.
*
* @param seconds the number of seconds, positive or negative
* @return a {@code Duration}, not null
*/
public static Duration ofSeconds(long seconds) {
return create(seconds, 0);
}
/**
* Obtains a {@code Duration} representing a number of seconds and an
* adjustment in nanoseconds.
* <p>
* This method allows an arbitrary number of nanoseconds to be passed in.
* The factory will alter the values of the second and nanosecond in order
* to ensure that the stored nanosecond is in the range 0 to 999,999,999.
* For example, the following will result in the exactly the same duration:
* <pre>
* Duration.ofSeconds(3, 1);
* Duration.ofSeconds(4, -999_999_999);
* Duration.ofSeconds(2, 1000_000_001);
* </pre>
*
* @param seconds the number of seconds, positive or negative
* @param nanoAdjustment the nanosecond adjustment to the number of seconds, positive or negative
* @return a {@code Duration}, not null
* @throws ArithmeticException if the adjustment causes the seconds to exceed the capacity of {@code Duration}
*/
public static Duration ofSeconds(long seconds, long nanoAdjustment) {
long secs = Math.addExact(seconds, Math.floorDiv(nanoAdjustment, NANOS_PER_SECOND));
int nos = (int) Math.floorMod(nanoAdjustment, NANOS_PER_SECOND);
return create(secs, nos);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} representing a number of milliseconds.
* <p>
* The seconds and nanoseconds are extracted from the specified milliseconds.
*
* @param millis the number of milliseconds, positive or negative
* @return a {@code Duration}, not null
*/
public static Duration ofMillis(long millis) {
long secs = millis / 1000;
int mos = (int) (millis % 1000);
if (mos < 0) {
mos += 1000;
secs--;
}
return create(secs, mos * 1000_000);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} representing a number of nanoseconds.
* <p>
* The seconds and nanoseconds are extracted from the specified nanoseconds.
*
* @param nanos the number of nanoseconds, positive or negative
* @return a {@code Duration}, not null
*/
public static Duration ofNanos(long nanos) {
long secs = nanos / NANOS_PER_SECOND;
int nos = (int) (nanos % NANOS_PER_SECOND);
if (nos < 0) {
nos += NANOS_PER_SECOND;
secs--;
}
return create(secs, nos);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} representing an amount in the specified unit.
* <p>
* The parameters represent the two parts of a phrase like '6 Hours'. For example:
* <pre>
* Duration.of(3, SECONDS);
* Duration.of(465, HOURS);
* </pre>
* Only a subset of units are accepted by this method.
* The unit must either have an {@linkplain TemporalUnit#isDurationEstimated() exact duration} or
* be {@link ChronoUnit#DAYS} which is treated as 24 hours. Other units throw an exception.
*
* @param amount the amount of the duration, measured in terms of the unit, positive or negative
* @param unit the unit that the duration is measured in, must have an exact duration, not null
* @return a {@code Duration}, not null
* @throws DateTimeException if the period unit has an estimated duration
* @throws ArithmeticException if a numeric overflow occurs
*/
public static Duration of(long amount, TemporalUnit unit) {
return ZERO.plus(amount, unit);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Duration} from a temporal amount.
* <p>
* This obtains a duration based on the specified amount.
* A {@code TemporalAmount} represents an amount of time, which may be
* date-based or time-based, which this factory extracts to a duration.
* <p>
* The conversion loops around the set of units from the amount and uses
* the {@linkplain TemporalUnit#getDuration() duration} of the unit to
* calculate the total {@code Duration}.
* Only a subset of units are accepted by this method. The unit must either
* have an {@linkplain TemporalUnit#isDurationEstimated() exact duration}
* or be {@link ChronoUnit#DAYS} which is treated as 24 hours.
* If any other units are found then an exception is thrown.
*
* @param amount the temporal amount to convert, not null
* @return the equivalent duration, not null
* @throws DateTimeException if unable to convert to a {@code Duration}
* @throws ArithmeticException if numeric overflow occurs
*/
public static Duration from(TemporalAmount amount) {
Objects.requireNonNull(amount, "amount");
Duration duration = ZERO;
for (TemporalUnit unit : amount.getUnits()) {
duration = duration.plus(amount.get(unit), unit);
}
return duration;
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} from a text string such as {@code PnDTnHnMn.nS}.
* <p>
* This will parse a textual representation of a duration, including the
* string produced by {@code toString()}. The formats accepted are based
* on the ISO-8601 duration format {@code PnDTnHnMn.nS} with days
* considered to be exactly 24 hours.
* <p>
* The string starts with an optional sign, denoted by the ASCII negative
* or positive symbol. If negative, the whole period is negated.
* The ASCII letter "P" is next in upper or lower case.
* There are then four sections, each consisting of a number and a suffix.
* The sections have suffixes in ASCII of "D", "H", "M" and "S" for
* days, hours, minutes and seconds, accepted in upper or lower case.
* The suffixes must occur in order. The ASCII letter "T" must occur before
* the first occurrence, if any, of an hour, minute or second section.
* At least one of the four sections must be present, and if "T" is present
* there must be at least one section after the "T".
* The number part of each section must consist of one or more ASCII digits.
* The number may be prefixed by the ASCII negative or positive symbol.
* The number of days, hours and minutes must parse to an {@code long}.
* The number of seconds must parse to an {@code long} with optional fraction.
* The decimal point may be either a dot or a comma.
* The fractional part may have from zero to 9 digits.
* <p>
* The leading plus/minus sign, and negative values for other units are
* not part of the ISO-8601 standard.
* <p>
* Examples:
* <pre>
* "PT20.345S" -- parses as "20.345 seconds"
* "PT15M" -- parses as "15 minutes" (where a minute is 60 seconds)
* "PT10H" -- parses as "10 hours" (where an hour is 3600 seconds)
* "P2D" -- parses as "2 days" (where a day is 24 hours or 86400 seconds)
* "P2DT3H4M" -- parses as "2 days, 3 hours and 4 minutes"
* "P-6H3M" -- parses as "-6 hours and +3 minutes"
* "-P6H3M" -- parses as "-6 hours and -3 minutes"
* "-P-6H+3M" -- parses as "+6 hours and -3 minutes"
* </pre>
*
* @param text the text to parse, not null
* @return the parsed duration, not null
* @throws DateTimeParseException if the text cannot be parsed to a duration
*/
public static Duration parse(CharSequence text) {
Objects.requireNonNull(text, "text");
Matcher matcher = PATTERN.matcher(text);
if (matcher.matches()) {
// check for letter T but no time sections
if ("T".equals(matcher.group(3)) == false) {
boolean negate = "-".equals(matcher.group(1));
String dayMatch = matcher.group(2);
String hourMatch = matcher.group(4);
String minuteMatch = matcher.group(5);
String secondMatch = matcher.group(6);
String fractionMatch = matcher.group(7);
if (dayMatch != null || hourMatch != null || minuteMatch != null || secondMatch != null) {
long daysAsSecs = parseNumber(text, dayMatch, SECONDS_PER_DAY, "days");
long hoursAsSecs = parseNumber(text, hourMatch, SECONDS_PER_HOUR, "hours");
long minsAsSecs = parseNumber(text, minuteMatch, SECONDS_PER_MINUTE, "minutes");
long seconds = parseNumber(text, secondMatch, 1, "seconds");
int nanos = parseFraction(text, fractionMatch, seconds < 0 ? -1 : 1);
try {
return create(negate, daysAsSecs, hoursAsSecs, minsAsSecs, seconds, nanos);
} catch (ArithmeticException ex) {
throw (DateTimeParseException) new DateTimeParseException("Text cannot be parsed to a Duration: overflow", text, 0).initCause(ex);
}
}
}
}
throw new DateTimeParseException("Text cannot be parsed to a Duration", text, 0);
}
private static long parseNumber(CharSequence text, String parsed, int multiplier, String errorText) {
// regex limits to [-+]?[0-9]+
if (parsed == null) {
return 0;
}
try {
long val = Long.parseLong(parsed);
return Math.multiplyExact(val, multiplier);
} catch (NumberFormatException | ArithmeticException ex) {
throw (DateTimeParseException) new DateTimeParseException("Text cannot be parsed to a Duration: " + errorText, text, 0).initCause(ex);
}
}
private static int parseFraction(CharSequence text, String parsed, int negate) {
// regex limits to [0-9]{0,9}
if (parsed == null || parsed.length() == 0) {
return 0;
}
try {
parsed = (parsed + "000000000").substring(0, 9);
return Integer.parseInt(parsed) * negate;
} catch (NumberFormatException | ArithmeticException ex) {
throw (DateTimeParseException) new DateTimeParseException("Text cannot be parsed to a Duration: fraction", text, 0).initCause(ex);
}
}
private static Duration create(boolean negate, long daysAsSecs, long hoursAsSecs, long minsAsSecs, long secs, int nanos) {
long seconds = Math.addExact(daysAsSecs, Math.addExact(hoursAsSecs, Math.addExact(minsAsSecs, secs)));
if (negate) {
return ofSeconds(seconds, nanos).negated();
}
return ofSeconds(seconds, nanos);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Duration} representing the duration between two temporal objects.
* <p>
* This calculates the duration between two temporal objects. If the objects
* are of different types, then the duration is calculated based on the type
* of the first object. For example, if the first argument is a {@code LocalTime}
* then the second argument is converted to a {@code LocalTime}.
* <p>
* The specified temporal objects must support the {@link ChronoUnit#SECONDS SECONDS} unit.
* For full accuracy, either the {@link ChronoUnit#NANOS NANOS} unit or the
* {@link ChronoField#NANO_OF_SECOND NANO_OF_SECOND} field should be supported.
* <p>
* The result of this method can be a negative period if the end is before the start.
* To guarantee to obtain a positive duration call {@link #abs()} on the result.
*
* @param startInclusive the start instant, inclusive, not null
* @param endExclusive the end instant, exclusive, not null
* @return a {@code Duration}, not null
* @throws DateTimeException if the seconds between the temporals cannot be obtained
* @throws ArithmeticException if the calculation exceeds the capacity of {@code Duration}
*/
public static Duration between(Temporal startInclusive, Temporal endExclusive) {
try {
return ofNanos(startInclusive.until(endExclusive, NANOS));
} catch (DateTimeException | ArithmeticException ex) {
long secs = startInclusive.until(endExclusive, SECONDS);
long nanos;
try {
nanos = endExclusive.getLong(NANO_OF_SECOND) - startInclusive.getLong(NANO_OF_SECOND);
if (secs > 0 && nanos < 0) {
secs++;
} else if (secs < 0 && nanos > 0) {
secs--;
}
} catch (DateTimeException ex2) {
nanos = 0;
}
return ofSeconds(secs, nanos);
}
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Duration} using seconds and nanoseconds.
*
* @param seconds the length of the duration in seconds, positive or negative
* @param nanoAdjustment the nanosecond adjustment within the second, from 0 to 999,999,999
*/
private static Duration create(long seconds, int nanoAdjustment) {
if ((seconds | nanoAdjustment) == 0) {
return ZERO;
}
return new Duration(seconds, nanoAdjustment);
}
/**
* Constructs an instance of {@code Duration} using seconds and nanoseconds.
*
* @param seconds the length of the duration in seconds, positive or negative
* @param nanos the nanoseconds within the second, from 0 to 999,999,999
*/
private Duration(long seconds, int nanos) {
super();
this.seconds = seconds;
this.nanos = nanos;
}
//-----------------------------------------------------------------------
/**
* Gets the value of the requested unit.
* <p>
* This returns a value for each of the two supported units,
* {@link ChronoUnit#SECONDS SECONDS} and {@link ChronoUnit#NANOS NANOS}.
* All other units throw an exception.
*
* @param unit the {@code TemporalUnit} for which to return the value
* @return the long value of the unit
* @throws DateTimeException if the unit is not supported
* @throws UnsupportedTemporalTypeException if the unit is not supported
*/
@Override
public long get(TemporalUnit unit) {
if (unit == SECONDS) {
return seconds;
} else if (unit == NANOS) {
return nanos;
} else {
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
}
/**
* Gets the set of units supported by this duration.
* <p>
* The supported units are {@link ChronoUnit#SECONDS SECONDS},
* and {@link ChronoUnit#NANOS NANOS}.
* They are returned in the order seconds, nanos.
* <p>
* This set can be used in conjunction with {@link #get(TemporalUnit)}
* to access the entire state of the period.
*
* @return a list containing the seconds and nanos units, not null
*/
@Override
public List<TemporalUnit> getUnits() {
return DurationUnits.UNITS;
}
/**
* Private class to delay initialization of this list until needed.
* The circular dependency between Duration and ChronoUnit prevents
* the simple initialization in Duration.
*/
private static class DurationUnits {
static final List<TemporalUnit> UNITS =
Collections.unmodifiableList(Arrays.<TemporalUnit>asList(SECONDS, NANOS));
}
//-----------------------------------------------------------------------
/**
* Checks if this duration is zero length.
* <p>
* A {@code Duration} represents a directed distance between two points on
* the time-line and can therefore be positive, zero or negative.
* This method checks whether the length is zero.
*
* @return true if this duration has a total length equal to zero
*/
public boolean isZero() {
return (seconds | nanos) == 0;
}
/**
* Checks if this duration is negative, excluding zero.
* <p>
* A {@code Duration} represents a directed distance between two points on
* the time-line and can therefore be positive, zero or negative.
* This method checks whether the length is less than zero.
*
* @return true if this duration has a total length less than zero
*/
public boolean isNegative() {
return seconds < 0;
}
//-----------------------------------------------------------------------
/**
* Gets the number of seconds in this duration.
* <p>
* The length of the duration is stored using two fields - seconds and nanoseconds.
* The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to
* the length in seconds.
* The total duration is defined by calling this method and {@link #getNano()}.
* <p>
* A {@code Duration} represents a directed distance between two points on the time-line.
* A negative duration is expressed by the negative sign of the seconds part.
* A duration of -1 nanosecond is stored as -1 seconds plus 999,999,999 nanoseconds.
*
* @return the whole seconds part of the length of the duration, positive or negative
*/
public long getSeconds() {
return seconds;
}
/**
* Gets the number of nanoseconds within the second in this duration.
* <p>
* The length of the duration is stored using two fields - seconds and nanoseconds.
* The nanoseconds part is a value from 0 to 999,999,999 that is an adjustment to
* the length in seconds.
* The total duration is defined by calling this method and {@link #getSeconds()}.
* <p>
* A {@code Duration} represents a directed distance between two points on the time-line.
* A negative duration is expressed by the negative sign of the seconds part.
* A duration of -1 nanosecond is stored as -1 seconds plus 999,999,999 nanoseconds.
*
* @return the nanoseconds within the second part of the length of the duration, from 0 to 999,999,999
*/
public int getNano() {
return nanos;
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration with the specified amount of seconds.
* <p>
* This returns a duration with the specified seconds, retaining the
* nano-of-second part of this duration.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param seconds the seconds to represent, may be negative
* @return a {@code Duration} based on this period with the requested seconds, not null
*/
public Duration withSeconds(long seconds) {
return create(seconds, nanos);
}
/**
* Returns a copy of this duration with the specified nano-of-second.
* <p>
* This returns a duration with the specified nano-of-second, retaining the
* seconds part of this duration.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999
* @return a {@code Duration} based on this period with the requested nano-of-second, not null
* @throws DateTimeException if the nano-of-second is invalid
*/
public Duration withNanos(int nanoOfSecond) {
NANO_OF_SECOND.checkValidIntValue(nanoOfSecond);
return create(seconds, nanoOfSecond);
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration with the specified duration added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param duration the duration to add, positive or negative, not null
* @return a {@code Duration} based on this duration with the specified duration added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plus(Duration duration) {
return plus(duration.getSeconds(), duration.getNano());
}
/**
* Returns a copy of this duration with the specified duration added.
* <p>
* The duration amount is measured in terms of the specified unit.
* Only a subset of units are accepted by this method.
* The unit must either have an {@linkplain TemporalUnit#isDurationEstimated() exact duration} or
* be {@link ChronoUnit#DAYS} which is treated as 24 hours. Other units throw an exception.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param amountToAdd the amount of the period, measured in terms of the unit, positive or negative
* @param unit the unit that the period is measured in, must have an exact duration, not null
* @return a {@code Duration} based on this duration with the specified duration added, not null
* @throws UnsupportedTemporalTypeException if the unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plus(long amountToAdd, TemporalUnit unit) {
Objects.requireNonNull(unit, "unit");
if (unit == DAYS) {
return plus(Math.multiplyExact(amountToAdd, SECONDS_PER_DAY), 0);
}
if (unit.isDurationEstimated()) {
throw new UnsupportedTemporalTypeException("Unit must not have an estimated duration");
}
if (amountToAdd == 0) {
return this;
}
if (unit instanceof ChronoUnit) {
switch ((ChronoUnit) unit) {
case NANOS: return plusNanos(amountToAdd);
case MICROS: return plusSeconds((amountToAdd / (1000_000L * 1000)) * 1000).plusNanos((amountToAdd % (1000_000L * 1000)) * 1000);
case MILLIS: return plusMillis(amountToAdd);
case SECONDS: return plusSeconds(amountToAdd);
}
return plusSeconds(Math.multiplyExact(unit.getDuration().seconds, amountToAdd));
}
Duration duration = unit.getDuration().multipliedBy(amountToAdd);
return plusSeconds(duration.getSeconds()).plusNanos(duration.getNano());
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration with the specified duration in standard 24 hour days added.
* <p>
* The number of days is multiplied by 86400 to obtain the number of seconds to add.
* This is based on the standard definition of a day as 24 hours.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param daysToAdd the days to add, positive or negative
* @return a {@code Duration} based on this duration with the specified days added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plusDays(long daysToAdd) {
return plus(Math.multiplyExact(daysToAdd, SECONDS_PER_DAY), 0);
}
/**
* Returns a copy of this duration with the specified duration in hours added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param hoursToAdd the hours to add, positive or negative
* @return a {@code Duration} based on this duration with the specified hours added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plusHours(long hoursToAdd) {
return plus(Math.multiplyExact(hoursToAdd, SECONDS_PER_HOUR), 0);
}
/**
* Returns a copy of this duration with the specified duration in minutes added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param minutesToAdd the minutes to add, positive or negative
* @return a {@code Duration} based on this duration with the specified minutes added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plusMinutes(long minutesToAdd) {
return plus(Math.multiplyExact(minutesToAdd, SECONDS_PER_MINUTE), 0);
}
/**
* Returns a copy of this duration with the specified duration in seconds added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param secondsToAdd the seconds to add, positive or negative
* @return a {@code Duration} based on this duration with the specified seconds added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plusSeconds(long secondsToAdd) {
return plus(secondsToAdd, 0);
}
/**
* Returns a copy of this duration with the specified duration in milliseconds added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param millisToAdd the milliseconds to add, positive or negative
* @return a {@code Duration} based on this duration with the specified milliseconds added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plusMillis(long millisToAdd) {
return plus(millisToAdd / 1000, (millisToAdd % 1000) * 1000_000);
}
/**
* Returns a copy of this duration with the specified duration in nanoseconds added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param nanosToAdd the nanoseconds to add, positive or negative
* @return a {@code Duration} based on this duration with the specified nanoseconds added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration plusNanos(long nanosToAdd) {
return plus(0, nanosToAdd);
}
/**
* Returns a copy of this duration with the specified duration added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param secondsToAdd the seconds to add, positive or negative
* @param nanosToAdd the nanos to add, positive or negative
* @return a {@code Duration} based on this duration with the specified seconds added, not null
* @throws ArithmeticException if numeric overflow occurs
*/
private Duration plus(long secondsToAdd, long nanosToAdd) {
if ((secondsToAdd | nanosToAdd) == 0) {
return this;
}
long epochSec = Math.addExact(seconds, secondsToAdd);
epochSec = Math.addExact(epochSec, nanosToAdd / NANOS_PER_SECOND);
nanosToAdd = nanosToAdd % NANOS_PER_SECOND;
long nanoAdjustment = nanos + nanosToAdd; // safe int+NANOS_PER_SECOND
return ofSeconds(epochSec, nanoAdjustment);
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration with the specified duration subtracted.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param duration the duration to subtract, positive or negative, not null
* @return a {@code Duration} based on this duration with the specified duration subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minus(Duration duration) {
long secsToSubtract = duration.getSeconds();
int nanosToSubtract = duration.getNano();
if (secsToSubtract == Long.MIN_VALUE) {
return plus(Long.MAX_VALUE, -nanosToSubtract).plus(1, 0);
}
return plus(-secsToSubtract, -nanosToSubtract);
}
/**
* Returns a copy of this duration with the specified duration subtracted.
* <p>
* The duration amount is measured in terms of the specified unit.
* Only a subset of units are accepted by this method.
* The unit must either have an {@linkplain TemporalUnit#isDurationEstimated() exact duration} or
* be {@link ChronoUnit#DAYS} which is treated as 24 hours. Other units throw an exception.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param amountToSubtract the amount of the period, measured in terms of the unit, positive or negative
* @param unit the unit that the period is measured in, must have an exact duration, not null
* @return a {@code Duration} based on this duration with the specified duration subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minus(long amountToSubtract, TemporalUnit unit) {
return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration with the specified duration in standard 24 hour days subtracted.
* <p>
* The number of days is multiplied by 86400 to obtain the number of seconds to subtract.
* This is based on the standard definition of a day as 24 hours.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param daysToSubtract the days to subtract, positive or negative
* @return a {@code Duration} based on this duration with the specified days subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minusDays(long daysToSubtract) {
return (daysToSubtract == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-daysToSubtract));
}
/**
* Returns a copy of this duration with the specified duration in hours subtracted.
* <p>
* The number of hours is multiplied by 3600 to obtain the number of seconds to subtract.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param hoursToSubtract the hours to subtract, positive or negative
* @return a {@code Duration} based on this duration with the specified hours subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minusHours(long hoursToSubtract) {
return (hoursToSubtract == Long.MIN_VALUE ? plusHours(Long.MAX_VALUE).plusHours(1) : plusHours(-hoursToSubtract));
}
/**
* Returns a copy of this duration with the specified duration in minutes subtracted.
* <p>
* The number of hours is multiplied by 60 to obtain the number of seconds to subtract.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param minutesToSubtract the minutes to subtract, positive or negative
* @return a {@code Duration} based on this duration with the specified minutes subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minusMinutes(long minutesToSubtract) {
return (minutesToSubtract == Long.MIN_VALUE ? plusMinutes(Long.MAX_VALUE).plusMinutes(1) : plusMinutes(-minutesToSubtract));
}
/**
* Returns a copy of this duration with the specified duration in seconds subtracted.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param secondsToSubtract the seconds to subtract, positive or negative
* @return a {@code Duration} based on this duration with the specified seconds subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minusSeconds(long secondsToSubtract) {
return (secondsToSubtract == Long.MIN_VALUE ? plusSeconds(Long.MAX_VALUE).plusSeconds(1) : plusSeconds(-secondsToSubtract));
}
/**
* Returns a copy of this duration with the specified duration in milliseconds subtracted.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param millisToSubtract the milliseconds to subtract, positive or negative
* @return a {@code Duration} based on this duration with the specified milliseconds subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minusMillis(long millisToSubtract) {
return (millisToSubtract == Long.MIN_VALUE ? plusMillis(Long.MAX_VALUE).plusMillis(1) : plusMillis(-millisToSubtract));
}
/**
* Returns a copy of this duration with the specified duration in nanoseconds subtracted.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param nanosToSubtract the nanoseconds to subtract, positive or negative
* @return a {@code Duration} based on this duration with the specified nanoseconds subtracted, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration minusNanos(long nanosToSubtract) {
return (nanosToSubtract == Long.MIN_VALUE ? plusNanos(Long.MAX_VALUE).plusNanos(1) : plusNanos(-nanosToSubtract));
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration multiplied by the scalar.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param multiplicand the value to multiply the duration by, positive or negative
* @return a {@code Duration} based on this duration multiplied by the specified scalar, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration multipliedBy(long multiplicand) {
if (multiplicand == 0) {
return ZERO;
}
if (multiplicand == 1) {
return this;
}
return create(toSeconds().multiply(BigDecimal.valueOf(multiplicand)));
}
/**
* Returns a copy of this duration divided by the specified value.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param divisor the value to divide the duration by, positive or negative, not zero
* @return a {@code Duration} based on this duration divided by the specified divisor, not null
* @throws ArithmeticException if the divisor is zero or if numeric overflow occurs
*/
public Duration dividedBy(long divisor) {
if (divisor == 0) {
throw new ArithmeticException("Cannot divide by zero");
}
if (divisor == 1) {
return this;
}
return create(toSeconds().divide(BigDecimal.valueOf(divisor), RoundingMode.DOWN));
}
/**
* Converts this duration to the total length in seconds and
* fractional nanoseconds expressed as a {@code BigDecimal}.
*
* @return the total length of the duration in seconds, with a scale of 9, not null
*/
private BigDecimal toSeconds() {
return BigDecimal.valueOf(seconds).add(BigDecimal.valueOf(nanos, 9));
}
/**
* Creates an instance of {@code Duration} from a number of seconds.
*
* @param seconds the number of seconds, up to scale 9, positive or negative
* @return a {@code Duration}, not null
* @throws ArithmeticException if numeric overflow occurs
*/
private static Duration create(BigDecimal seconds) {
BigInteger nanos = seconds.movePointRight(9).toBigIntegerExact();
BigInteger[] divRem = nanos.divideAndRemainder(BI_NANOS_PER_SECOND);
if (divRem[0].bitLength() > 63) {
throw new ArithmeticException("Exceeds capacity of Duration: " + nanos);
}
return ofSeconds(divRem[0].longValue(), divRem[1].intValue());
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this duration with the length negated.
* <p>
* This method swaps the sign of the total length of this duration.
* For example, {@code PT1.3S} will be returned as {@code PT-1.3S}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return a {@code Duration} based on this duration with the amount negated, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration negated() {
return multipliedBy(-1);
}
/**
* Returns a copy of this duration with a positive length.
* <p>
* This method returns a positive duration by effectively removing the sign from any negative total length.
* For example, {@code PT-1.3S} will be returned as {@code PT1.3S}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return a {@code Duration} based on this duration with an absolute length, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Duration abs() {
return isNegative() ? negated() : this;
}
//-------------------------------------------------------------------------
/**
* Adds this duration to the specified temporal object.
* <p>
* This returns a temporal object of the same observable type as the input
* with this duration added.
* <p>
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#plus(TemporalAmount)}.
* <pre>
* // these two lines are equivalent, but the second approach is recommended
* dateTime = thisDuration.addTo(dateTime);
* dateTime = dateTime.plus(thisDuration);
* </pre>
* <p>
* The calculation will add the seconds, then nanos.
* Only non-zero amounts will be added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param temporal the temporal object to adjust, not null
* @return an object of the same type with the adjustment made, not null
* @throws DateTimeException if unable to add
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal addTo(Temporal temporal) {
if (seconds != 0) {
temporal = temporal.plus(seconds, SECONDS);
}
if (nanos != 0) {
temporal = temporal.plus(nanos, NANOS);
}
return temporal;
}
/**
* Subtracts this duration from the specified temporal object.
* <p>
* This returns a temporal object of the same observable type as the input
* with this duration subtracted.
* <p>
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#minus(TemporalAmount)}.
* <pre>
* // these two lines are equivalent, but the second approach is recommended
* dateTime = thisDuration.subtractFrom(dateTime);
* dateTime = dateTime.minus(thisDuration);
* </pre>
* <p>
* The calculation will subtract the seconds, then nanos.
* Only non-zero amounts will be added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param temporal the temporal object to adjust, not null
* @return an object of the same type with the adjustment made, not null
* @throws DateTimeException if unable to subtract
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal subtractFrom(Temporal temporal) {
if (seconds != 0) {
temporal = temporal.minus(seconds, SECONDS);
}
if (nanos != 0) {
temporal = temporal.minus(nanos, NANOS);
}
return temporal;
}
//-----------------------------------------------------------------------
/**
* Gets the number of days in this duration.
* <p>
* This returns the total number of days in the duration by dividing the
* number of seconds by 86400.
* This is based on the standard definition of a day as 24 hours.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return the number of days in the duration, may be negative
*/
public long toDays() {
return seconds / SECONDS_PER_DAY;
}
/**
* Gets the number of hours in this duration.
* <p>
* This returns the total number of hours in the duration by dividing the
* number of seconds by 3600.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return the number of hours in the duration, may be negative
*/
public long toHours() {
return seconds / SECONDS_PER_HOUR;
}
/**
* Gets the number of minutes in this duration.
* <p>
* This returns the total number of minutes in the duration by dividing the
* number of seconds by 60.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @return the number of minutes in the duration, may be negative
*/
public long toMinutes() {
return seconds / SECONDS_PER_MINUTE;
}
/**
* Converts this duration to the total length in milliseconds.
* <p>
* If this duration is too large to fit in a {@code long} milliseconds, then an
* exception is thrown.
* <p>
* If this duration has greater than millisecond precision, then the conversion
* will drop any excess precision information as though the amount in nanoseconds
* was subject to integer division by one million.
*
* @return the total length of the duration in milliseconds
* @throws ArithmeticException if numeric overflow occurs
*/
public long toMillis() {
long millis = Math.multiplyExact(seconds, 1000);
millis = Math.addExact(millis, nanos / 1000_000);
return millis;
}
/**
* Converts this duration to the total length in nanoseconds expressed as a {@code long}.
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java