org.threeten.bp.jdk8
Class DefaultInterfaceTemporalAccessor

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

All Implemented Interfaces:

TemporalAccessor

Direct Known Subclasses:

DefaultInterfaceEra, DefaultInterfaceTemporal, Instant, LocalTime, MonthDay, OffsetTime, Year, YearMonth

public abstract class DefaultInterfaceTemporalAccessor
extends Object
implements TemporalAccessor

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

DefaultInterfaceTemporalAccessor

public DefaultInterfaceTemporalAccessor()

range

public ValueRange range(TemporalField field)

Description copied from interface: TemporalAccessor

Gets the range of valid values for the specified field.

All fields can be expressed as a long integer. This method returns an object that describes the valid range for that value. The value of this temporal object is used to enhance the accuracy of the returned range. If the date-time cannot return the range, because the field is unsupported or for some other reason, an exception will be thrown.

Note that the result only describes the minimum and maximum valid values and it is important not to read too much into them. For example, there could be values within the range that are invalid for the field.

Specification for implementors

Implementations must check and handle all fields defined in ChronoField. If the field is supported, then the range 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.rangeRefinedBy(TemporalAccessorl) passing this as the argument.

Implementations must not alter either this object.

Specified by:

range in interface TemporalAccessor

Parameters:

field - the field to query the range for, not null

Returns:

the range of valid values for the field, not null

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

Parameters:

field - the field to get, not null

Returns:

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

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

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)