org.joda.time.field
Class DelegatedDurationField

java.lang.Object
  org.joda.time.DurationField
      org.joda.time.field.DelegatedDurationField

All Implemented Interfaces:

Serializable, Comparable<DurationField>

public class DelegatedDurationField
extends DurationField
implements Serializable

DelegatedDurationField delegates each method call to the duration field it wraps.

DelegatedDurationField is thread-safe and immutable, and its subclasses must be as well.

Since:

1.0

Author:

Brian S O'Neill

See Also:

DecoratedDurationField, Serialized Form

Constructor Summary

protected	DelegatedDurationField(DurationField field) Constructor.
protected	DelegatedDurationField(DurationField field, DurationFieldType type) Constructor.

Method Summary

long	add(long instant, int value) Adds a duration value (which may be negative) to the instant.
long	add(long instant, long value) Adds a duration value (which may be negative) to the instant.
int	compareTo(DurationField durationField)
boolean	equals(Object obj)
int	getDifference(long minuendInstant, long subtrahendInstant) Computes the difference between two instants, as measured in the units of this field.
long	getDifferenceAsLong(long minuendInstant, long subtrahendInstant) Computes the difference between two instants, as measured in the units of this field.
long	getMillis(int value) Get the millisecond duration of this field from its value, which is approximate if this field is imprecise.
long	getMillis(int value, long instant) Get the millisecond duration of this field from its value relative to an instant.
long	getMillis(long value) Get the millisecond duration of this field from its value, which is approximate if this field is imprecise.
long	getMillis(long value, long instant) Get the millisecond duration of this field from its value relative to an instant.
String	getName() Get the name of the field.
DurationFieldType	getType() Get the type of the field.
long	getUnitMillis() Returns the amount of milliseconds per unit value of this field.
int	getValue(long duration) Get the value of this field from the milliseconds, which is approximate if this field is imprecise.
int	getValue(long duration, long instant) Get the value of this field from the milliseconds relative to an instant.
long	getValueAsLong(long duration) Get the value of this field from the milliseconds, which is approximate if this field is imprecise.
long	getValueAsLong(long duration, long instant) Get the value of this field from the milliseconds relative to an instant.
DurationField	getWrappedField() Gets the wrapped duration field.
int	hashCode()
boolean	isPrecise() Is this field precise.
boolean	isSupported() Returns true if this field is supported.
String	toString() Get a suitable debug string.

Methods inherited from class org.joda.time.DurationField

subtract, subtract

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatedDurationField

protected DelegatedDurationField(DurationField field)

Constructor.

Parameters:

field - the base field

DelegatedDurationField

protected DelegatedDurationField(DurationField field,
                                 DurationFieldType type)

Constructor.

Parameters:

field - the base field

type - the field type to use

Method Detail

getWrappedField

public final DurationField getWrappedField()

Gets the wrapped duration field.

Returns:

the wrapped DurationField

getType

public DurationFieldType getType()

Description copied from class: DurationField

Get the type of the field.

Specified by:

getType in class DurationField

Returns:

field type

getName

public String getName()

Description copied from class: DurationField

Get the name of the field.

By convention, names are plural.

Specified by:

getName in class DurationField

Returns:

field name

isSupported

public boolean isSupported()

Returns true if this field is supported.

Specified by:

isSupported in class DurationField

Returns:

true if this field is supported

isPrecise

public boolean isPrecise()

Description copied from class: DurationField

Is this field precise. A precise field can calculate its value from milliseconds without needing a reference date. Put another way, a precise field's unit size is not variable.

Specified by:

isPrecise in class DurationField

Returns:

true if precise

See Also:

DurationField.getUnitMillis()

getValue

public int getValue(long duration)

Description copied from class: DurationField

Get the value of this field from the milliseconds, which is approximate if this field is imprecise.

Specified by:

getValue in class DurationField

Parameters:

duration - the milliseconds to query, which may be negative

Returns:

the value of the field, in the units of the field, which may be negative

getValueAsLong

public long getValueAsLong(long duration)

Description copied from class: DurationField

Get the value of this field from the milliseconds, which is approximate if this field is imprecise.

Specified by:

getValueAsLong in class DurationField

Parameters:

duration - the milliseconds to query, which may be negative

Returns:

the value of the field, in the units of the field, which may be negative

getValue

public int getValue(long duration,
                    long instant)

Description copied from class: DurationField

Get the value of this field from the milliseconds relative to an instant. For precise fields this method produces the same result as for the single argument get method.

If the millisecond duration is positive, then the instant is treated as a "start instant". If negative, the instant is treated as an "end instant".

Specified by:

getValue in class DurationField

Parameters:

duration - the milliseconds to query, which may be negative

instant - the start instant to calculate relative to

Returns:

the value of the field, in the units of the field, which may be negative

getValueAsLong

public long getValueAsLong(long duration,
                           long instant)

Description copied from class: DurationField

Get the value of this field from the milliseconds relative to an instant. For precise fields this method produces the same result as for the single argument get method.

If the millisecond duration is positive, then the instant is treated as a "start instant". If negative, the instant is treated as an "end instant".

Specified by:

getValueAsLong in class DurationField

Parameters:

duration - the milliseconds to query, which may be negative

instant - the start instant to calculate relative to

Returns:

the value of the field, in the units of the field, which may be negative

getMillis

public long getMillis(int value)

Description copied from class: DurationField

Get the millisecond duration of this field from its value, which is approximate if this field is imprecise.

Specified by:

getMillis in class DurationField

Parameters:

value - the value of the field, which may be negative

Returns:

the milliseconds that the field represents, which may be negative

getMillis

public long getMillis(long value)

Description copied from class: DurationField

Get the millisecond duration of this field from its value, which is approximate if this field is imprecise.

Specified by:

getMillis in class DurationField

Parameters:

value - the value of the field, which may be negative

Returns:

the milliseconds that the field represents, which may be negative

getMillis

public long getMillis(int value,
                      long instant)

Description copied from class: DurationField

Get the millisecond duration of this field from its value relative to an instant. For precise fields this method produces the same result as for the single argument getMillis method.

If the value is positive, then the instant is treated as a "start instant". If negative, the instant is treated as an "end instant".

Specified by:

getMillis in class DurationField

Parameters:

value - the value of the field, which may be negative

instant - the instant to calculate relative to

Returns:

the millisecond duration that the field represents, which may be negative

getMillis

public long getMillis(long value,
                      long instant)

Description copied from class: DurationField

Get the millisecond duration of this field from its value relative to an instant. For precise fields this method produces the same result as for the single argument getMillis method.

If the value is positive, then the instant is treated as a "start instant". If negative, the instant is treated as an "end instant".

Specified by:

getMillis in class DurationField

Parameters:

value - the value of the field, which may be negative

instant - the instant to calculate relative to

Returns:

the millisecond duration that the field represents, which may be negative

add

public long add(long instant,
                int value)

Description copied from class: DurationField

Adds a duration value (which may be negative) to the instant.

Specified by:

add in class DurationField

Parameters:

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

value - the value to add, in the units of the field

Returns:

the updated milliseconds

add

public long add(long instant,
                long value)

Description copied from class: DurationField

Adds a duration value (which may be negative) to the instant.

Specified by:

add in class DurationField

Parameters:

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

value - the value to add, in the units of the field

Returns:

the updated milliseconds

getDifference

public int getDifference(long minuendInstant,
                         long subtrahendInstant)

Description copied from class: DurationField

Computes the difference between two instants, as measured in the units of this field. Any fractional units are dropped from the result. Calling getDifference reverses the effect of calling add. In the following code:

 long instant = ...
 int v = ...
 int age = getDifference(add(instant, v), instant);
 

The value 'age' is the same as the value 'v'.

Specified by:

getDifference in class DurationField

Parameters:

minuendInstant - the milliseconds from 1970-01-01T00:00:00Z to subtract from

subtrahendInstant - the milliseconds from 1970-01-01T00:00:00Z to subtract off the minuend

Returns:

the difference in the units of this field

getDifferenceAsLong

public long getDifferenceAsLong(long minuendInstant,
                                long subtrahendInstant)

Description copied from class: DurationField

Computes the difference between two instants, as measured in the units of this field. Any fractional units are dropped from the result. Calling getDifference reverses the effect of calling add. In the following code:

 long instant = ...
 long v = ...
 long age = getDifferenceAsLong(add(instant, v), instant);
 

The value 'age' is the same as the value 'v'.

Specified by:

getDifferenceAsLong in class DurationField

Parameters:

minuendInstant - the milliseconds from 1970-01-01T00:00:00Z to subtract from

subtrahendInstant - the milliseconds from 1970-01-01T00:00:00Z to subtract off the minuend

Returns:

the difference in the units of this field

getUnitMillis

public long getUnitMillis()

Description copied from class: DurationField

Returns the amount of milliseconds per unit value of this field. For example, if this field represents "seconds", then this returns the milliseconds in one second.

For imprecise fields, the unit size is variable, and so this method returns a suitable average value.

Specified by:

getUnitMillis in class DurationField

Returns:

the unit size of this field, in milliseconds

See Also:

DurationField.isPrecise()

compareTo

public int compareTo(DurationField durationField)

Specified by:

compareTo in interface Comparable<DurationField>

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Description copied from class: DurationField

Get a suitable debug string.

Specified by:

toString in class DurationField

Returns:

debug string