org.joda.time
Class Hours

java.lang.Object
  org.joda.time.base.BaseSingleFieldPeriod
      org.joda.time.Hours

All Implemented Interfaces:

Comparable, ReadablePeriod, Serializable

public final class Hours

extends BaseSingleFieldPeriod

An immutable time period representing a number of hours.

Hours is an immutable period that can only store hours. It does not store years, months or minutes for example. As such it is a type-safe way of representing a number of hours in an application.

The number of hours is set in the constructor, and may be queried using getHours(). Basic mathematical operations are provided - plus(), minus(), multipliedBy() and dividedBy().

Hours is thread-safe and immutable.

Since:

1.4

Author:

Stephen Colebourne

See Also:

Serialized Form

Field Summary

static Hours	EIGHT Constant representing eight hours.
static Hours	FIVE Constant representing five hours.
static Hours	FOUR Constant representing four hours.
static Hours	MAX_VALUE Constant representing the maximum number of hours that can be stored in this object.
static Hours	MIN_VALUE Constant representing the minimum number of hours that can be stored in this object.
static Hours	ONE Constant representing one hour.
static Hours	SEVEN Constant representing seven hours.
static Hours	SIX Constant representing six hours.
static Hours	THREE Constant representing three hours.
static Hours	TWO Constant representing two hours.
static Hours	ZERO Constant representing zero hours.

Method Summary

Hours	dividedBy(int divisor) Returns a new instance with the hours divided by the specified divisor.
DurationFieldType	getFieldType() Gets the duration field type, which is hours.
int	getHours() Gets the number of hours that this period represents.
PeriodType	getPeriodType() Gets the period type, which is hours.
static Hours	hours(int hours) Obtains an instance of Hours that may be cached.
static Hours	hoursBetween(ReadableInstant start, ReadableInstant end) Creates a Hours representing the number of whole hours between the two specified datetimes.
static Hours	hoursBetween(ReadablePartial start, ReadablePartial end) Creates a Hours representing the number of whole hours between the two specified partial datetimes.
static Hours	hoursIn(ReadableInterval interval) Creates a Hours representing the number of whole hours in the specified interval.
boolean	isGreaterThan(Hours other) Is this hours instance greater than the specified number of hours.
boolean	isLessThan(Hours other) Is this hours instance less than the specified number of hours.
Hours	minus(Hours hours) Returns a new instance with the specified number of hours taken away.
Hours	minus(int hours) Returns a new instance with the specified number of hours taken away.
Hours	multipliedBy(int scalar) Returns a new instance with the hours multiplied by the specified scalar.
Hours	negated() Returns a new instance with the hours value negated.
static Hours	parseHours(String periodStr) Creates a new Hours by parsing a string in the ISO8601 format 'PTnH'.
Hours	plus(Hours hours) Returns a new instance with the specified number of hours added.
Hours	plus(int hours) Returns a new instance with the specified number of hours added.
static Hours	standardHoursIn(ReadablePeriod period) Creates a new Hours representing the number of complete standard length hours in the specified period.
Days	toStandardDays() Converts this period in hours to a period in days assuming a 24 hour day.
Duration	toStandardDuration() Converts this period in hours to a duration in milliseconds assuming a 60 minute hour and 60 second minute.
Minutes	toStandardMinutes() Converts this period in hours to a period in minutes assuming a 60 minute hour.
Seconds	toStandardSeconds() Converts this period in hours to a period in seconds assuming a 60 minute hour and 60 second minute.
Weeks	toStandardWeeks() Converts this period in hours to a period in weeks assuming a 7 day week and 24 hour day.
String	toString() Gets this instance as a String in the ISO8601 duration format.

Methods inherited from class org.joda.time.base.BaseSingleFieldPeriod

compareTo, equals, get, getFieldType, getValue, hashCode, isSupported, size, toMutablePeriod, toPeriod

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

ZERO

public static final Hours ZERO

Constant representing zero hours.

ONE

public static final Hours ONE

Constant representing one hour.

TWO

public static final Hours TWO

Constant representing two hours.

THREE

public static final Hours THREE

Constant representing three hours.

FOUR

public static final Hours FOUR

Constant representing four hours.

FIVE

public static final Hours FIVE

Constant representing five hours.

SIX

public static final Hours SIX

Constant representing six hours.

SEVEN

public static final Hours SEVEN

Constant representing seven hours.

EIGHT

public static final Hours EIGHT

Constant representing eight hours.

MAX_VALUE

public static final Hours MAX_VALUE

Constant representing the maximum number of hours that can be stored in this object.

MIN_VALUE

public static final Hours MIN_VALUE

Constant representing the minimum number of hours that can be stored in this object.

Method Detail

hours

public static Hours hours(int hours)

Obtains an instance of Hours that may be cached. Hours is immutable, so instances can be cached and shared. This factory method provides access to shared instances.

Parameters:

hours - the number of hours to obtain an instance for

Returns:

the instance of Hours

hoursBetween

public static Hours hoursBetween(ReadableInstant start,
                                 ReadableInstant end)

Creates a Hours representing the number of whole hours between the two specified datetimes.

Parameters:

start - the start instant, must not be null

end - the end instant, must not be null

Returns:

the period in hours

Throws:

IllegalArgumentException - if the instants are null or invalid

hoursBetween

public static Hours hoursBetween(ReadablePartial start,
                                 ReadablePartial end)

Creates a Hours representing the number of whole hours between the two specified partial datetimes.

The two partials must contain the same fields, for example you can specify two LocalTime objects.

Parameters:

start - the start partial date, must not be null

end - the end partial date, must not be null

Returns:

the period in hours

Throws:

IllegalArgumentException - if the partials are null or invalid

hoursIn

public static Hours hoursIn(ReadableInterval interval)

Creates a Hours representing the number of whole hours in the specified interval.

Parameters:

interval - the interval to extract hours from, null returns zero

Returns:

the period in hours

Throws:

IllegalArgumentException - if the partials are null or invalid

standardHoursIn

public static Hours standardHoursIn(ReadablePeriod period)

Creates a new Hours representing the number of complete standard length hours in the specified period.

This factory method converts all fields from the period to hours using standardised durations for each field. Only those fields which have a precise duration in the ISO UTC chronology can be converted.

• One week consists of 7 days.
• One day consists of 24 hours.
• One hour consists of 60 minutes.
• One minute consists of 60 seconds.
• One second consists of 1000 milliseconds.

Months and Years are imprecise and periods containing these values cannot be converted.

Parameters:

period - the period to get the number of hours from, null returns zero

Returns:

the period in hours

Throws:

IllegalArgumentException - if the period contains imprecise duration values

parseHours

public static Hours parseHours(String periodStr)

Creates a new Hours by parsing a string in the ISO8601 format 'PTnH'.

The parse will accept the full ISO syntax of PnYnMnWnDTnHnMnS however only the hours component may be non-zero. If any other component is non-zero, an exception will be thrown.

Parameters:

periodStr - the period string, null returns zero

Returns:

the period in hours

Throws:

IllegalArgumentException - if the string format is invalid

getFieldType

public DurationFieldType getFieldType()

Gets the duration field type, which is hours.

Specified by:

getFieldType in class BaseSingleFieldPeriod

Returns:

the period type

getPeriodType

public PeriodType getPeriodType()

Gets the period type, which is hours.

Specified by:

getPeriodType in interface ReadablePeriod

Specified by:

getPeriodType in class BaseSingleFieldPeriod

Returns:

the period type

toStandardWeeks

public Weeks toStandardWeeks()

Converts this period in hours to a period in weeks assuming a 7 day week and 24 hour day.

This method allows you to convert between different types of period. However to achieve this it makes the assumption that all weeks are 7 days long and all days are 24 hours long. This is not true when daylight savings time is considered, and may also not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.

Returns:

a period representing the number of whole weeks for this number of hours

toStandardDays

public Days toStandardDays()

Converts this period in hours to a period in days assuming a 24 hour day.

This method allows you to convert between different types of period. However to achieve this it makes the assumption that all days are 24 hours long. This is not true when daylight savings time is considered, and may also not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.

Returns:

a period representing the number of whole days for this number of hours

toStandardMinutes

public Minutes toStandardMinutes()

Converts this period in hours to a period in minutes assuming a 60 minute hour.

This method allows you to convert between different types of period. However to achieve this it makes the assumption that all hours are 60 minutes long. This may not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.

Returns:

a period representing the number of minutes for this number of hours

Throws:

ArithmeticException - if the number of minutes is too large to be represented

toStandardSeconds

public Seconds toStandardSeconds()

Converts this period in hours to a period in seconds assuming a 60 minute hour and 60 second minute.

This method allows you to convert between different types of period. However to achieve this it makes the assumption that all hours are 60 minutes long and all minutes are 60 seconds long. This may not be true for some unusual chronologies. However, it is included as it is a useful operation for many applications and business rules.

Returns:

a period representing the number of seconds for this number of hours

Throws:

ArithmeticException - if the number of seconds is too large to be represented

toStandardDuration

public Duration toStandardDuration()

Converts this period in hours to a duration in milliseconds assuming a 60 minute hour and 60 second minute.

This method allows you to convert from a period to a duration. However to achieve this it makes the assumption that all hours are 60 minutes and all minutes are 60 seconds. This might not be true for an unusual chronology, for example one that takes leap seconds into account. However, the method is included as it is a useful operation for many applications and business rules.

Returns:

a duration equivalent to this number of hours

getHours

public int getHours()

Gets the number of hours that this period represents.

Returns:

the number of hours in the period

plus

public Hours plus(int hours)

Returns a new instance with the specified number of hours added.

This instance is immutable and unaffected by this method call.

Parameters:

hours - the amount of hours to add, may be negative

Returns:

the new period plus the specified number of hours

Throws:

ArithmeticException - if the result overflows an int

plus

public Hours plus(Hours hours)

Returns a new instance with the specified number of hours added.

This instance is immutable and unaffected by this method call.

Parameters:

hours - the amount of hours to add, may be negative, null means zero

Returns:

the new period plus the specified number of hours

Throws:

ArithmeticException - if the result overflows an int

minus

public Hours minus(int hours)

Returns a new instance with the specified number of hours taken away.

This instance is immutable and unaffected by this method call.

Parameters:

hours - the amount of hours to take away, may be negative

Returns:

the new period minus the specified number of hours

Throws:

ArithmeticException - if the result overflows an int

minus

public Hours minus(Hours hours)

Returns a new instance with the specified number of hours taken away.

This instance is immutable and unaffected by this method call.

Parameters:

hours - the amount of hours to take away, may be negative, null means zero

Returns:

the new period minus the specified number of hours

Throws:

ArithmeticException - if the result overflows an int

multipliedBy

public Hours multipliedBy(int scalar)

Returns a new instance with the hours multiplied by the specified scalar.

This instance is immutable and unaffected by this method call.

Parameters:

scalar - the amount to multiply by, may be negative

Returns:

the new period multiplied by the specified scalar

Throws:

ArithmeticException - if the result overflows an int

dividedBy

public Hours dividedBy(int divisor)

Returns a new instance with the hours divided by the specified divisor. The calculation uses integer division, thus 3 divided by 2 is 1.

This instance is immutable and unaffected by this method call.

Parameters:

divisor - the amount to divide by, may be negative

Returns:

the new period divided by the specified divisor

Throws:

ArithmeticException - if the divisor is zero

negated

public Hours negated()

Returns a new instance with the hours value negated.

Returns:

the new period with a negated value

Throws:

ArithmeticException - if the result overflows an int

isGreaterThan

public boolean isGreaterThan(Hours other)

Is this hours instance greater than the specified number of hours.

Parameters:

other - the other period, null means zero

Returns:

true if this hours instance is greater than the specified one

isLessThan

public boolean isLessThan(Hours other)

Is this hours instance less than the specified number of hours.

Parameters:

other - the other period, null means zero

Returns:

true if this hours instance is less than the specified one

toString

public String toString()

Gets this instance as a String in the ISO8601 duration format.

For example, "PT4H" represents 4 hours.

Returns:

the value as an ISO8601 string