org.goda.time

Class Weeks

java.lang.Object

org.goda.time.base.BaseSingleFieldPeriod

org.goda.time.Weeks

All Implemented Interfaces:

Serializable, Comparable, ReadablePeriod

public final class Weeks
extends BaseSingleFieldPeriod

An immutable time period representing a number of weeks.

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

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

Weeks is thread-safe and immutable.

Since:

1.4

Author:

Stephen Colebourne

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Weeks	MAX_VALUE Constant representing the maximum number of weeks that can be stored in this object.
static Weeks	MIN_VALUE Constant representing the minimum number of weeks that can be stored in this object.
static Weeks	ONE Constant representing one week.
static Weeks	THREE Constant representing three weeks.
static Weeks	TWO Constant representing two weeks.
static Weeks	ZERO Constant representing zero weeks.

Method Summary

Methods

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

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

between, between, compareTo, equals, get, getFieldType, getValue, getValue, hashCode, isSupported, setValue, size, standardPeriodIn, toMutablePeriod, toPeriod

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ZERO

public static final Weeks ZERO

Constant representing zero weeks.

ONE

public static final Weeks ONE

Constant representing one week.

TWO

public static final Weeks TWO

Constant representing two weeks.

THREE

public static final Weeks THREE

Constant representing three weeks.

MAX_VALUE

public static final Weeks MAX_VALUE

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

MIN_VALUE

public static final Weeks MIN_VALUE

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

Method Detail

weeks

public static Weeks weeks(int weeks)

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

Parameters:

weeks - the number of weeks to obtain an instance for

Returns:

the instance of Weeks

weeksBetween

public static Weeks weeksBetween(ReadableInstant start,
                 ReadableInstant end)

Creates a Weeks representing the number of whole weeks 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 weeks

Throws:

IllegalArgumentException - if the instants are null or invalid

weeksBetween

public static Weeks weeksBetween(ReadablePartial start,
                 ReadablePartial end)

Creates a Weeks representing the number of whole weeks between the two specified partial datetimes.

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

Parameters:

start - the start partial date, must not be null

end - the end partial date, must not be null

Returns:

the period in weeks

Throws:

IllegalArgumentException - if the partials are null or invalid

weeksIn

public static Weeks weeksIn(ReadableInterval interval)

Creates a Weeks representing the number of whole weeks in the specified interval.

Parameters:

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

Returns:

the period in weeks

Throws:

IllegalArgumentException - if the partials are null or invalid

standardWeeksIn

public static Weeks standardWeeksIn(ReadablePeriod period)

Creates a new Weeks representing the number of complete standard length weeks 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 weeks.
• 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 weeks

Throws:

IllegalArgumentException - if the period contains imprecise duration values

parseWeeks

public static Weeks parseWeeks(String periodStr)

Creates a new Weeks by parsing a string in the ISO8601 format 'PnW'.

The parse will accept the full ISO syntax of PnYnMnWnDTnHnMnS however only the weeks 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 weeks

Throws:

IllegalArgumentException - if the string format is invalid

getFieldType

public DurationFieldType getFieldType()

Gets the duration field type, which is weeks.

Specified by:

getFieldType in class BaseSingleFieldPeriod

Returns:

the period type

getPeriodType

public PeriodType getPeriodType()

Gets the period type, which is weeks.

Specified by:

getPeriodType in interface ReadablePeriod

Specified by:

getPeriodType in class BaseSingleFieldPeriod

Returns:

the period type

toStandardDays

public Days toStandardDays()

Converts this period in weeks to a period in days assuming a 7 day week.

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. 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 days for this number of weeks

Throws:

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

toStandardHours

public Hours toStandardHours()

Converts this period in weeks to a period in hours 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 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 hours for this number of weeks

Throws:

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

toStandardMinutes

public Minutes toStandardMinutes()

Converts this period in weeks to a period in minutes assuming a 7 day week, 24 hour day and 60 minute hour.

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, all days are 24 hours long and all hours are 60 minutes long. This is not true when daylight savings 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 minutes for this number of weeks

Throws:

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

toStandardSeconds

public Seconds toStandardSeconds()

Converts this period in weeks to a period in seconds assuming a 7 day week, 24 hour day, 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 weeks are 7 days long, all days are 24 hours long, all hours are 60 minutes long and all minutes are 60 seconds long. This is not true when daylight savings 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 seconds for this number of weeks

Throws:

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

toStandardDuration

public Duration toStandardDuration()

Converts this period in weeks to a duration in milliweeks assuming a 7 day week, 24 hour day, 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 weeks are 7 days long, all days are 24 hours long, all hours are 60 minutes long and all minutes are 60 seconds 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 duration equivalent to this number of weeks

getWeeks

public int getWeeks()

Gets the number of weeks that this period represents.

Returns:

the number of weeks in the period

plus

public Weeks plus(int weeks)

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

This instance is immutable and unaffected by this method call.

Parameters:

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

Returns:

the new period plus the specified number of weeks

Throws:

ArithmeticException - if the result overflows an int

plus

public Weeks plus(Weeks weeks)

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

This instance is immutable and unaffected by this method call.

Parameters:

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

Returns:

the new period plus the specified number of weeks

Throws:

ArithmeticException - if the result overflows an int

minus

public Weeks minus(int weeks)

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

This instance is immutable and unaffected by this method call.

Parameters:

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

Returns:

the new period minus the specified number of weeks

Throws:

ArithmeticException - if the result overflows an int

minus

public Weeks minus(Weeks weeks)

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

This instance is immutable and unaffected by this method call.

Parameters:

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

Returns:

the new period minus the specified number of weeks

Throws:

ArithmeticException - if the result overflows an int

multipliedBy

public Weeks multipliedBy(int scalar)

Returns a new instance with the weeks 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 Weeks dividedBy(int divisor)

Returns a new instance with the weeks 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 Weeks negated()

Returns a new instance with the weeks value negated.

Returns:

the new period with a negated value

Throws:

ArithmeticException - if the result overflows an int

isGreaterThan

public boolean isGreaterThan(Weeks other)

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

Parameters:

other - the other period, null means zero

Returns:

true if this weeks instance is greater than the specified one

isLessThan

public boolean isLessThan(Weeks other)

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

Parameters:

other - the other period, null means zero

Returns:

true if this weeks instance is less than the specified one

toString

public String toString()

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

For example, "P4W" represents 4 weeks.

Specified by:

toString in interface ReadablePeriod

Overrides:

toString in class Object

Returns:

the value as an ISO8601 string