org.joda.time.field

Class 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.

Author:
Brian S O'Neill
Since:
1.0
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

get, getDurationField, getMaximumValue, getMinimumValue, getRangeDurationField, getWrappedField, isLenient, roundFloor, set

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

add, add, add, addWrapField, addWrapField, addWrapPartial, convertText, get, getAsShortText, getAsShortText, getAsShortText, getAsShortText, getAsShortText, getAsText, getAsText, getAsText, getAsText, getAsText, getDifference, getDifferenceAsLong, getDurationField, getLeapAmount, getLeapDurationField, getMaximumShortTextLength, getMaximumTextLength, getMaximumValue, getMaximumValue, getMaximumValue, getMaximumValue, getMinimumValue, getMinimumValue, getMinimumValue, getMinimumValue, getName, getRangeDurationField, getType, isLeap, isSupported, remainder, roundCeiling, roundFloor, roundHalfCeiling, roundHalfEven, roundHalfFloor, set, set, set, set, set, toString

Methods inherited from class org.joda.time.DateTimeField

add, add, add, addWrapField, addWrapField, addWrapPartial, get, getAsShortText, getAsShortText, getAsShortText, getAsShortText, getAsShortText, getAsText, getAsText, getAsText, getAsText, getAsText, getDifference, getDifferenceAsLong, getDurationField, getLeapAmount, getLeapDurationField, getMaximumShortTextLength, getMaximumTextLength, getMaximumValue, getMaximumValue, getMaximumValue, getMaximumValue, getMinimumValue, getMinimumValue, getMinimumValue, getMinimumValue, getName, getRangeDurationField, getType, isLeap, isLenient, isSupported, remainder, roundCeiling, roundFloor, roundHalfCeiling, roundHalfEven, roundHalfFloor, set, set, set, set, set, toString

Constructor Details

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

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 Details

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 interface BaseDateTimeField
Parameters:
instant - the time instant in millis to update.
amount - the amount to add (can be negative).
Returns:
the updated time instant.

get

public int get(long instant)
Get the remainder from the specified time instant.
Overrides:
get in interface DecoratedDateTimeField
Parameters:
instant - the time instant in millis to query.
Returns:
the remainder extracted from the input.

getDivisor

public int getDivisor()
Returns the divisor applied, in the field's units.
Returns:
the divisor

getMaximumValue

public int getMaximumValue()
Get the maximum value for the field, which is always one less than the divisor.
Overrides:
getMaximumValue in interface DecoratedDateTimeField
Returns:
the maximum value

getMinimumValue

public int getMinimumValue()
Get the minimum value for the field, which is always zero.
Overrides:
getMinimumValue in interface DecoratedDateTimeField
Returns:
the minimum value of zero.

getRangeDurationField

public DurationField getRangeDurationField()
Returns a scaled version of the wrapped field's unit duration field.
Overrides:
getRangeDurationField in interface DecoratedDateTimeField

remainder

public long remainder(long instant)
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 interface BaseDateTimeField
Parameters:
instant - the milliseconds from 1970-01-01T00:00:00Z to get the remainder
Returns:
remainder duration, in milliseconds

roundCeiling

public long roundCeiling(long instant)
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 interface BaseDateTimeField
Parameters:
instant - the milliseconds from 1970-01-01T00:00:00Z to round
Returns:
rounded milliseconds

roundFloor

public long roundFloor(long instant)
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 interface DecoratedDateTimeField
Parameters:
instant - the milliseconds from 1970-01-01T00:00:00Z to round
Returns:
rounded milliseconds

roundHalfCeiling

public long roundHalfCeiling(long instant)
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 interface BaseDateTimeField
Parameters:
instant - the milliseconds from 1970-01-01T00:00:00Z to round
Returns:
rounded milliseconds

roundHalfEven

public long roundHalfEven(long instant)
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 interface BaseDateTimeField
Parameters:
instant - the milliseconds from 1970-01-01T00:00:00Z to round
Returns:
rounded milliseconds

roundHalfFloor

public long roundHalfFloor(long instant)
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 interface BaseDateTimeField
Parameters:
instant - the milliseconds from 1970-01-01T00:00:00Z to round
Returns:
rounded milliseconds

set

public long set(long instant,
                int value)
Set the specified amount of remainder units to the specified time instant.
Overrides:
set in interface DecoratedDateTimeField
Parameters:
instant - the time instant in millis to update.
value - value of remainder units to set.
Returns:
the updated time instant.

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