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/*
* Copyright 2001-2010 Stephen Colebourne
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.joda.time;
import java.io.Serializable;
import org.joda.convert.FromString;
import org.joda.time.base.BaseDuration;
import org.joda.time.field.FieldUtils;
/**
* An immutable duration specifying a length of time in milliseconds.
*
* A duration is defined by a fixed number of milliseconds.
* There is no concept of fields, such as days or seconds, as these fields can vary in length.
* A duration may be converted to a {@link Period} to obtain field values.
* This conversion will typically cause a loss of precision however.
*
* Duration is thread-safe and immutable.
*
* @author Brian S O'Neill
* @author Stephen Colebourne
* @since 1.0
*/
public final class Duration
extends BaseDuration
implements ReadableDuration, Serializable {
/** Constant representing zero millisecond duration */
public static final Duration ZERO = new Duration(0L);
/** Serialization version */
private static final long serialVersionUID = 2471658376918L;
//-----------------------------------------------------------------------
/**
* Parses a {@code Duration} from the specified string.
*
* This parses the format {@code PTa.bS}, as per {@link #toString()}.
*
* @param str the string to parse, not null
* @since 2.0
*/
@FromString
public static Duration parse(String str) {
return new Duration(str);
}
//-----------------------------------------------------------------------
/**
* Create a duration with the specified number of days assuming that
* there are the standard number of milliseconds in a day.
*
* This method assumes that there are 24 hours in a day,
* 60 minutes in an hour, 60 seconds in a minute and 1000 milliseconds in
* a second. This will be true for most days, however days with Daylight
* Savings changes will not have 24 hours, so use this method with care.
*
* A Duration is a representation of an amount of time. If you want to express
* the concepts of 'days' you should consider using the {@link Days} class.
*
* @param days the number of standard days in this duration
* @return the duration, never null
* @throws ArithmeticException if the days value is too large
* @since 1.6
*/
public static Duration standardDays(long days) {
if (days == 0) {
return ZERO;
}
return new Duration(FieldUtils.safeMultiply(days, DateTimeConstants.MILLIS_PER_DAY));
}
/**
* Create a duration with the specified number of hours assuming that
* there are the standard number of milliseconds in an hour.
*
* This method assumes that there are 60 minutes in an hour,
* 60 seconds in a minute and 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* A Duration is a representation of an amount of time. If you want to express
* the concepts of 'hours' you should consider using the {@link Hours} class.
*
* @param hours the number of standard hours in this duration
* @return the duration, never null
* @throws ArithmeticException if the hours value is too large
* @since 1.6
*/
public static Duration standardHours(long hours) {
if (hours == 0) {
return ZERO;
}
return new Duration(FieldUtils.safeMultiply(hours, DateTimeConstants.MILLIS_PER_HOUR));
}
/**
* Create a duration with the specified number of minutes assuming that
* there are the standard number of milliseconds in a minute.
*
* This method assumes that there are 60 seconds in a minute and
* 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* A Duration is a representation of an amount of time. If you want to express
* the concepts of 'minutes' you should consider using the {@link Minutes} class.
*
* @param minutes the number of standard minutes in this duration
* @return the duration, never null
* @throws ArithmeticException if the minutes value is too large
* @since 1.6
*/
public static Duration standardMinutes(long minutes) {
if (minutes == 0) {
return ZERO;
}
return new Duration(FieldUtils.safeMultiply(minutes, DateTimeConstants.MILLIS_PER_MINUTE));
}
/**
* Create a duration with the specified number of seconds assuming that
* there are the standard number of milliseconds in a second.
*
* This method assumes that there are 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* A Duration is a representation of an amount of time. If you want to express
* the concepts of 'seconds' you should consider using the {@link Seconds} class.
*
* @param seconds the number of standard seconds in this duration
* @return the duration, never null
* @throws ArithmeticException if the seconds value is too large
* @since 1.6
*/
public static Duration standardSeconds(long seconds) {
if (seconds == 0) {
return ZERO;
}
return new Duration(FieldUtils.safeMultiply(seconds, DateTimeConstants.MILLIS_PER_SECOND));
}
/**
* Create a duration with the specified number of milliseconds.
*
* @param millis the number of standard milliseconds in this duration
* @return the duration, never null
* @since 2.0
*/
public static Duration millis(long millis) {
if (millis == 0) {
return ZERO;
}
return new Duration(millis);
}
//-----------------------------------------------------------------------
/**
* Creates a duration from the given millisecond duration.
*
* @param duration the duration, in milliseconds
*/
public Duration(long duration) {
super(duration);
}
/**
* Creates a duration from the given interval endpoints.
*
* @param startInstant interval start, in milliseconds
* @param endInstant interval end, in milliseconds
* @throws ArithmeticException if the duration exceeds a 64 bit long
*/
public Duration(long startInstant, long endInstant) {
super(startInstant, endInstant);
}
/**
* Creates a duration from the given interval endpoints.
*
* @param start interval start, null means now
* @param end interval end, null means now
* @throws ArithmeticException if the duration exceeds a 64 bit long
*/
public Duration(ReadableInstant start, ReadableInstant end) {
super(start, end);
}
/**
* Creates a duration from the specified object using the
* {@link org.joda.time.convert.ConverterManager ConverterManager}.
*
* @param duration duration to convert
* @throws IllegalArgumentException if duration is invalid
*/
public Duration(Object duration) {
super(duration);
}
//-----------------------------------------------------------------------
/**
* Gets the length of this duration in days assuming that there are the
* standard number of milliseconds in a day.
*
* This method assumes that there are 24 hours in a day,
* 60 minutes in an hour, 60 seconds in a minute and 1000 milliseconds in
* a second. This will be true for most days, however days with Daylight
* Savings changes will not have 24 hours, so use this method with care.
*
* This returns getMillis() / MILLIS_PER_DAY.
* The result is an integer division, thus excess milliseconds are truncated.
*
* @return the length of the duration in standard seconds
* @since 2.0
*/
public long getStandardDays() {
return getMillis() / DateTimeConstants.MILLIS_PER_DAY;
}
/**
* Gets the length of this duration in hours assuming that there are the
* standard number of milliseconds in an hour.
*
* This method assumes that there are 60 minutes in an hour,
* 60 seconds in a minute and 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* This returns getMillis() / MILLIS_PER_HOUR.
* The result is an integer division, thus excess milliseconds are truncated.
*
* @return the length of the duration in standard seconds
* @since 2.0
*/
public long getStandardHours() {
return getMillis() / DateTimeConstants.MILLIS_PER_HOUR;
}
/**
* Gets the length of this duration in minutes assuming that there are the
* standard number of milliseconds in a minute.
*
* This method assumes that there are 60 seconds in a minute and
* 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* This returns getMillis() / 60000.
* The result is an integer division, thus excess milliseconds are truncated.
*
* @return the length of the duration in standard seconds
* @since 2.0
*/
public long getStandardMinutes() {
return getMillis() / DateTimeConstants.MILLIS_PER_MINUTE;
}
/**
* Gets the length of this duration in seconds assuming that there are the
* standard number of milliseconds in a second.
*
* This method assumes that there are 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* This returns getMillis() / 1000.
* The result is an integer division, so 2999 millis returns 2 seconds.
*
* @return the length of the duration in standard seconds
* @since 1.6
*/
public long getStandardSeconds() {
return getMillis() / DateTimeConstants.MILLIS_PER_SECOND;
}
//-----------------------------------------------------------------------
/**
* Get this duration as an immutable Duration object
* by returning this.
*
* @return this
*/
public Duration toDuration() {
return this;
}
/**
* Converts this duration to a period in days assuming that there are the
* standard number of milliseconds in a day.
*
* This method assumes that there are 24 hours in a day,
* 60 minutes in an hour, 60 seconds in a minute and 1000 milliseconds in
* a second. This will be true for most days, however days with Daylight
* Savings changes will not have 24 hours, so use this method with care.
*
* @return a period representing the number of standard days in this period, never null
* @throws ArithmeticException if the number of days is too large to be represented
* @since 2.0
*/
public Days toStandardDays() {
long days = getStandardDays();
return Days.days(FieldUtils.safeToInt(days));
}
/**
* Converts this duration to a period in hours assuming that there are the
* standard number of milliseconds in an hour.
*
* This method assumes that there are 60 minutes in an hour,
* 60 seconds in a minute and 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* @return a period representing the number of standard hours in this period, never null
* @throws ArithmeticException if the number of hours is too large to be represented
* @since 2.0
*/
public Hours toStandardHours() {
long hours = getStandardHours();
return Hours.hours(FieldUtils.safeToInt(hours));
}
/**
* Converts this duration to a period in minutes assuming that there are the
* standard number of milliseconds in a minute.
*
* This method assumes that there are 60 seconds in a minute and
* 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* @return a period representing the number of standard minutes in this period, never null
* @throws ArithmeticException if the number of minutes is too large to be represented
* @since 2.0
*/
public Minutes toStandardMinutes() {
long minutes = getStandardMinutes();
return Minutes.minutes(FieldUtils.safeToInt(minutes));
}
/**
* Converts this duration to a period in seconds assuming that there are the
* standard number of milliseconds in a second.
*
* This method assumes that there are 1000 milliseconds in a second.
* All currently supplied chronologies use this definition.
*
* @return a period representing the number of standard seconds in this period, never null
* @throws ArithmeticException if the number of seconds is too large to be represented
* @since 1.6
*/
public Seconds toStandardSeconds() {
long seconds = getStandardSeconds();
return Seconds.seconds(FieldUtils.safeToInt(seconds));
}
//-----------------------------------------------------------------------
/**
* Creates a new Duration instance with a different milisecond length.
*
* @param duration the new length of the duration
* @return the new duration instance
*/
public Duration withMillis(long duration) {
if (duration == getMillis()) {
return this;
}
return new Duration(duration);
}
/**
* Returns a new duration with this length plus that specified multiplied by the scalar.
* This instance is immutable and is not altered.
*
* If the addition is zero, this instance is returned.
*
* @param durationToAdd the duration to add to this one
* @param scalar the amount of times to add, such as -1 to subtract once
* @return the new duration instance
*/
public Duration withDurationAdded(long durationToAdd, int scalar) {
if (durationToAdd == 0 || scalar == 0) {
return this;
}
long add = FieldUtils.safeMultiply(durationToAdd, scalar);
long duration = FieldUtils.safeAdd(getMillis(), add);
return new Duration(duration);
}
/**
* Returns a new duration with this length plus that specified multiplied by the scalar.
* This instance is immutable and is not altered.
*
* If the addition is zero, this instance is returned.
*
* @param durationToAdd the duration to add to this one, null means zero
* @param scalar the amount of times to add, such as -1 to subtract once
* @return the new duration instance
*/
public Duration withDurationAdded(ReadableDuration durationToAdd, int scalar) {
if (durationToAdd == null || scalar == 0) {
return this;
}
return withDurationAdded(durationToAdd.getMillis(), scalar);
}
//-----------------------------------------------------------------------
/**
* Returns a new duration with this length plus that specified.
* This instance is immutable and is not altered.
*
* If the addition is zero, this instance is returned.
*
* @param amount the duration to add to this one
* @return the new duration instance
*/
public Duration plus(long amount) {
return withDurationAdded(amount, 1);
}
/**
* Returns a new duration with this length plus that specified.
* This instance is immutable and is not altered.
*
* If the amount is zero, this instance is returned.
*
* @param amount the duration to add to this one, null means zero
* @return the new duration instance
*/
public Duration plus(ReadableDuration amount) {
if (amount == null) {
return this;
}
return withDurationAdded(amount.getMillis(), 1);
}
/**
* Returns a new duration with this length minus that specified.
* This instance is immutable and is not altered.
*
* If the addition is zero, this instance is returned.
*
* @param amount the duration to take away from this one
* @return the new duration instance
*/
public Duration minus(long amount) {
return withDurationAdded(amount, -1);
}
/**
* Returns a new duration with this length minus that specified.
* This instance is immutable and is not altered.
*
* If the amount is zero, this instance is returned.
*
* @param amount the duration to take away from this one, null means zero
* @return the new duration instance
*/
public Duration minus(ReadableDuration amount) {
if (amount == null) {
return this;
}
return withDurationAdded(amount.getMillis(), -1);
}
}