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org.joda.time.field
Class BaseDurationField

java.lang.Object
  extended by org.joda.time.DurationField
      extended by org.joda.time.field.BaseDurationField
All Implemented Interfaces:
Serializable, Comparable<DurationField>
Direct Known Subclasses:
DecoratedDurationField, PreciseDurationField
public abstract class BaseDurationField
extends DurationField
implements Serializable

BaseDurationField provides the common behaviour for DurationField implementations.

This class should generally not be used directly by API users. The DurationField class should be used when different kinds of DurationField objects are to be referenced.

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

Since:
1.0
See Also:
DecoratedDurationField, Serialized Form

Constructor Summary
protected BaseDurationField(DurationFieldType type)
           
 
Method Summary
 int compareTo(DurationField otherField)
           
 int getDifference(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(long value)
          Get the millisecond duration of this field from its value, which is approximate if this field is imprecise.
 String getName()
          Get the name of the field.
 DurationFieldType getType()
          Get the type of the 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.
 boolean isSupported()
          Returns true if this field is supported.
 String toString()
          Get a suitable debug string.
 
Methods inherited from class org.joda.time.DurationField
add, add, getDifferenceAsLong, getMillis, getMillis, getUnitMillis, getValueAsLong, isPrecise, subtract, subtract
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

BaseDurationField

protected BaseDurationField(DurationFieldType type)
Method Detail

getType

public final DurationFieldType getType()
Description copied from class: DurationField
Get the type of the field.

Specified by:
getType in class DurationField
Returns:
field type

getName

public final 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 final boolean isSupported()
Description copied from class: DurationField
Returns true if this field is supported.

Specified by:
isSupported in class DurationField
Returns:
true always

getValue

public int getValue(long duration)
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)
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)
Get the value of this field from the milliseconds relative to an instant.

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

The default implementation returns Utils.safeToInt(getAsLong(millisDuration, 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

getMillis

public long getMillis(int value)
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)
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

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

compareTo

public int compareTo(DurationField otherField)
Specified by:
compareTo in interface Comparable<DurationField>

toString

public String toString()
Get a suitable debug string.

Specified by:
toString in class DurationField
Returns:
debug string
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