org.joda.time.field
Class RemainderDateTimeField

java.lang.Object
  org.joda.time.DateTimeField
      org.joda.time.field.BaseDateTimeField
          org.joda.time.field.DecoratedDateTimeField
              org.joda.time.field.RemainderDateTimeField

public class RemainderDateTimeField

extends DecoratedDateTimeField

Counterpart remainder datetime field to DividedDateTimeField. The field's unit duration is unchanged, but the range duration is scaled accordingly.

RemainderDateTimeField is thread-safe and immutable.

Since:

1.0

Author:

Brian S O'Neill

See Also:

DividedDateTimeField

Constructor Summary

RemainderDateTimeField(DateTimeField field, DateTimeFieldType type, int divisor)
Constructor.

RemainderDateTimeField(DividedDateTimeField dividedField)
Construct a RemainderDateTimeField that compliments the given DividedDateTimeField.

RemainderDateTimeField(DividedDateTimeField dividedField, DateTimeFieldType type)
Construct a RemainderDateTimeField that compliments the given DividedDateTimeField.

Method Summary

long	addWrapField(long instant, int amount) Add the specified amount to the specified time instant, wrapping around within the remainder range if necessary.
int	get(long instant) Get the remainder from the specified time instant.
int	getDivisor() Returns the divisor applied, in the field's units.
int	getMaximumValue() Get the maximum value for the field, which is always one less than the divisor.
int	getMinimumValue() Get the minimum value for the field, which is always zero.
DurationField	getRangeDurationField() Returns a scaled version of the wrapped field's unit duration field.
long	remainder(long instant) Returns the fractional duration milliseconds of this field.
long	roundCeiling(long instant) Round to the highest whole unit of this field.
long	roundFloor(long instant) Round to the lowest whole unit of this field.
long	roundHalfCeiling(long instant) Round to the nearest whole unit of this field.
long	roundHalfEven(long instant) Round to the nearest whole unit of this field.
long	roundHalfFloor(long instant) Round to the nearest whole unit of this field.
long	set(long instant, int value) Set the specified amount of remainder units to the specified time instant.

Methods inherited from class org.joda.time.field.DecoratedDateTimeField

getDurationField, getWrappedField, isLenient

Methods inherited from class org.joda.time.field.BaseDateTimeField

add, add, add, addWrapField, addWrapPartial, getAsShortText, getAsShortText, getAsShortText, getAsShortText, getAsShortText, getAsText, getAsText, getAsText, getAsText, getAsText, getDifference, getDifferenceAsLong, getLeapAmount, getLeapDurationField, getMaximumShortTextLength, getMaximumTextLength, getMaximumValue, getMaximumValue, getMaximumValue, getMinimumValue, getMinimumValue, getMinimumValue, getName, getType, isLeap, isSupported, set, set, set, set, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RemainderDateTimeField

public RemainderDateTimeField(DateTimeField field,
                              DateTimeFieldType type,
                              int divisor)

Constructor.

Parameters:

field - the field to wrap, like "year()".

type - the field type this field actually uses

divisor - divisor, such as 100 years in a century

Throws:

IllegalArgumentException - if divisor is less than two

RemainderDateTimeField

public RemainderDateTimeField(DividedDateTimeField dividedField)

Construct a RemainderDateTimeField that compliments the given DividedDateTimeField.

Parameters:

dividedField - complimentary divided field, like "century()".

RemainderDateTimeField

public RemainderDateTimeField(DividedDateTimeField dividedField,
                              DateTimeFieldType type)

Construct a RemainderDateTimeField that compliments the given DividedDateTimeField.

Parameters:

dividedField - complimentary divided field, like "century()".

type - the field type this field actually uses

Method Detail

get

public int get(long instant)

Get the remainder from the specified time instant.

Overrides:

get in class DecoratedDateTimeField

Parameters:

instant - the time instant in millis to query.

Returns:

the remainder extracted from the input.

addWrapField

public long addWrapField(long instant,
                         int amount)

Add the specified amount to the specified time instant, wrapping around within the remainder range if necessary. The amount added may be negative.

Overrides:

addWrapField in class BaseDateTimeField

Parameters:

instant - the time instant in millis to update.

amount - the amount to add (can be negative).

Returns:

the updated time instant.

set

public long set(long instant,
                int value)

Set the specified amount of remainder units to the specified time instant.

Overrides:

set in class DecoratedDateTimeField

Parameters:

instant - the time instant in millis to update.

value - value of remainder units to set.

Returns:

the updated time instant.

Throws:

IllegalArgumentException - if value is too large or too small.

getRangeDurationField

public DurationField getRangeDurationField()

Returns a scaled version of the wrapped field's unit duration field.

Overrides:

getRangeDurationField in class DecoratedDateTimeField

getMinimumValue

public int getMinimumValue()

Get the minimum value for the field, which is always zero.

Overrides:

getMinimumValue in class DecoratedDateTimeField

Returns:

the minimum value of zero.

getMaximumValue

public int getMaximumValue()

Get the maximum value for the field, which is always one less than the divisor.

Overrides:

getMaximumValue in class DecoratedDateTimeField

Returns:

the maximum value

roundFloor

public long roundFloor(long instant)

Description copied from class: BaseDateTimeField

Round to the lowest whole unit of this field. After rounding, the value of this field and all fields of a higher magnitude are retained. The fractional millis that cannot be expressed in whole increments of this field are set to minimum.

For example, a datetime of 2002-11-02T23:34:56.789, rounded to the lowest whole hour is 2002-11-02T23:00:00.000.

Overrides:

roundFloor in class DecoratedDateTimeField

roundCeiling

public long roundCeiling(long instant)

Description copied from class: BaseDateTimeField

Round to the highest whole unit of this field. The value of this field and all fields of a higher magnitude may be incremented in order to achieve this result. The fractional millis that cannot be expressed in whole increments of this field are set to minimum.

For example, a datetime of 2002-11-02T23:34:56.789, rounded to the highest whole hour is 2002-11-03T00:00:00.000.

The default implementation calls roundFloor, and if the instant is modified as a result, adds one field unit. Subclasses are encouraged to provide a more efficient implementation.

Overrides:

roundCeiling in class BaseDateTimeField

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z to round

Returns:

rounded milliseconds

roundHalfFloor

public long roundHalfFloor(long instant)

Description copied from class: BaseDateTimeField

Round to the nearest whole unit of this field. If the given millisecond value is closer to the floor or is exactly halfway, this function behaves like roundFloor. If the millisecond value is closer to the ceiling, this function behaves like roundCeiling.

Overrides:

roundHalfFloor in class BaseDateTimeField

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z to round

Returns:

rounded milliseconds

roundHalfCeiling

public long roundHalfCeiling(long instant)

Description copied from class: BaseDateTimeField

Round to the nearest whole unit of this field. If the given millisecond value is closer to the floor, this function behaves like roundFloor. If the millisecond value is closer to the ceiling or is exactly halfway, this function behaves like roundCeiling.

Overrides:

roundHalfCeiling in class BaseDateTimeField

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z to round

Returns:

rounded milliseconds

roundHalfEven

public long roundHalfEven(long instant)

Description copied from class: BaseDateTimeField

Round to the nearest whole unit of this field. If the given millisecond value is closer to the floor, this function behaves like roundFloor. If the millisecond value is closer to the ceiling, this function behaves like roundCeiling.

If the millisecond value is exactly halfway between the floor and ceiling, the ceiling is chosen over the floor only if it makes this field's value even.

Overrides:

roundHalfEven in class BaseDateTimeField

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z to round

Returns:

rounded milliseconds

remainder

public long remainder(long instant)

Description copied from class: BaseDateTimeField

Returns the fractional duration milliseconds of this field. In other words, calling remainder returns the duration that roundFloor would subtract.

For example, on a datetime of 2002-11-02T23:34:56.789, the remainder by hour is 34 minutes and 56.789 seconds.

The default implementation computes instant - roundFloor(instant). Subclasses are encouraged to provide a more efficient implementation.

Overrides:

remainder in class BaseDateTimeField

Parameters:

instant - the milliseconds from 1970-01-01T00:00:00Z to get the remainder

Returns:

remainder duration, in milliseconds

getDivisor

public int getDivisor()

Returns the divisor applied, in the field's units.

Returns:

the divisor