org.threeten.bp.jdk8
Class DefaultInterfaceEra

java.lang.Object
  org.threeten.bp.jdk8.DefaultInterfaceTemporalAccessor
      org.threeten.bp.jdk8.DefaultInterfaceEra

All Implemented Interfaces:

Era, TemporalAccessor, TemporalAdjuster

Direct Known Subclasses:

JapaneseEra

public abstract class DefaultInterfaceEra
extends DefaultInterfaceTemporalAccessor
implements Era

A temporary class providing implementations that will become default interface methods once integrated into JDK 8.

DefaultInterfaceEra

public DefaultInterfaceEra()

isSupported

public boolean isSupported(TemporalField field)

Description copied from interface: TemporalAccessor

Checks if the specified field is supported.

This checks if the date-time can be queried for the specified field. If false, then calling the range and get methods will throw an exception.

Specification for implementors

Implementations must check and handle all fields defined in ChronoField. If the field is supported, then true is returned, otherwise false

If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument.

Implementations must not alter this object.

Specified by:

isSupported in interface TemporalAccessor

Parameters:

field - the field to check, null returns false

Returns:

true if this date-time can be queried for the field, false if not

get

public int get(TemporalField field)

Description copied from interface: TemporalAccessor

Gets the value of the specified field as an int.

This queries the date-time for the value for the specified field. The returned value will always be within the valid range of values for the field. If the date-time cannot return the value, because the field is unsupported or for some other reason, an exception will be thrown.

Specification for implementors

Implementations must check and handle all fields defined in ChronoField. If the field is supported and has an int range, then the value of the field must be returned. If unsupported, then a DateTimeException must be thrown.

If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument.

Implementations must not alter either this object.

Specified by:

get in interface TemporalAccessor

Overrides:

get in class DefaultInterfaceTemporalAccessor

Parameters:

field - the field to get, not null

Returns:

the value for the field, within the valid range of values

getLong

public long getLong(TemporalField field)

Description copied from interface: TemporalAccessor

Gets the value of the specified field as a long.

This queries the date-time for the value for the specified field. The returned value may be outside the valid range of values for the field. If the date-time cannot return the value, because the field is unsupported or for some other reason, an exception will be thrown.

Specification for implementors

Implementations must check and handle all fields defined in ChronoField. If the field is supported, then the value of the field must be returned. If unsupported, then a DateTimeException must be thrown.

If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument.

Implementations must not alter either this object.

Specified by:

getLong in interface TemporalAccessor

Parameters:

field - the field to get, not null

Returns:

the value for the field

adjustInto

public Temporal adjustInto(Temporal temporal)

Description copied from interface: TemporalAdjuster

Adjusts the specified temporal object.

This adjusts the specified temporal object using the logic encapsulated in the implementing class. Examples might be an adjuster that sets the date avoiding weekends, or one that sets the date to the last day of the month.

There are two equivalent ways of using this method. The first is to invoke this method directly. The second is to use Temporal.with(TemporalAdjuster):

   // these two lines are equivalent, but the second approach is recommended
   temporal = thisAdjuster.adjustInto(temporal);
   temporal = temporal.with(thisAdjuster);
 

It is recommended to use the second approach, with(TemporalAdjuster), as it is a lot clearer to read in code.

Specification for implementors

The implementation must take the input object and adjust it. The implementation defines the logic of the adjustment and is responsible for documenting that logic. It may use any method on Temporal to query the temporal object and perform the adjustment. The returned object must have the same observable type as the input object

The input object must not be altered. Instead, an adjusted copy of the original must be returned. This provides equivalent, safe behavior for immutable and mutable temporal objects.

The input temporal object may be in a calendar system other than ISO. Implementations may choose to document compatibility with other calendar systems, or reject non-ISO temporal objects by querying the chronology.

This method may be called from multiple threads in parallel. It must be thread-safe when invoked.

Specified by:

adjustInto in interface TemporalAdjuster

Parameters:

temporal - the temporal object to adjust, not null

Returns:

an object of the same observable type with the adjustment made, not null

query

public <R> R query(TemporalQuery<R> query)

Description copied from interface: TemporalAccessor

Queries this date-time.

This queries this date-time using the specified query strategy object.

Queries are a key tool for extracting information from date-times. They exists to externalize the process of querying, permitting different approaches, as per the strategy design pattern. Examples might be a query that checks if the date is the day before February 29th in a leap year, or calculates the number of days to your next birthday.

The most common query implementations are method references, such as LocalDate::from and ZoneId::from. Further implementations are on TemporalQueries. Queries may also be defined by applications.

Specification for implementors

Implementations of this method must behave as follows:

   public <R> R query(TemporalQuery<R> type) {
     // only include an if statement if the implementation can return it
     if (query == TemporalQueries.zoneId())  return // the ZoneId
     if (query == TemporalQueries.chronology())  return // the Chrono
     if (query == TemporalQueries.precision())  return // the precision
     // call default method
     return super.query(query);
   }
 

Specified by:

query in interface TemporalAccessor

Overrides:

query in class DefaultInterfaceTemporalAccessor

Type Parameters:

R - the type of the result

Parameters:

query - the query to invoke, not null

Returns:

the query result, null may be returned (defined by the query)

getDisplayName

public String getDisplayName(TextStyle style,
                             Locale locale)

Description copied from interface: Era

Gets the textual representation of this era.

This returns the textual name used to identify the era. The parameters control the style of the returned text and the locale.

If no textual mapping is found then the numeric value is returned.

Specified by:

getDisplayName in interface Era

Parameters:

style - the style of the text required, not null

locale - the locale to use, not null

Returns:

the text value of the era, not null