Package org.joda.time

Interface ReadableInstant

All Superinterfaces:
Comparable<ReadableInstant>
All Known Subinterfaces:
ReadableDateTime, ReadWritableDateTime, ReadWritableInstant
All Known Implementing Classes:
AbstractDateTime, AbstractInstant, BaseDateTime, DateMidnight, DateTime, Instant, MutableDateTime

public interface ReadableInstant extends Comparable<ReadableInstant>
Defines an instant in the datetime continuum. This interface expresses the datetime as milliseconds from 1970-01-01T00:00:00Z.

The implementation of this interface may be mutable or immutable. This interface only gives access to retrieve data, never to change it.

Methods in your application should be defined using ReadableInstant as a parameter if the method only wants to read the instant without needing to know the specific datetime fields.

The compareTo method is no longer defined in this class in version 2.0. Instead, the definition is simply inherited from the Comparable interface. This approach is necessary to preserve binary compatibility. The definition of the comparison is ascending order by millisecond instant. Implementors are recommended to extend AbstractInstant instead of this interface.

Since:
1.0
Author:
Stephen Colebourne
  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    equals(Object readableInstant)
    Compares this object with the specified object for equality based on the millisecond instant and the Chronology.
    int
    Get the value of one of the fields of a datetime.
    Gets the chronology of the instant.
    long
    Get the value as the number of milliseconds since the epoch, 1970-01-01T00:00:00Z.
    Gets the time zone of the instant from the chronology.
    int
    Gets a hash code for the instant that is compatible with the equals method.
    boolean
    Is this instant after the instant passed in comparing solely by millisecond.
    boolean
    Is this instant before the instant passed in comparing solely by millisecond.
    boolean
    Is this instant equal to the instant passed in comparing solely by millisecond.
    boolean
    Checks whether the field type specified is supported by this implementation.
    Get the value as a simple immutable Instant object.
    Get the value as a String in a recognisable ISO8601 format.

    Methods inherited from interface java.lang.Comparable

    compareTo
  • Method Details

    • getMillis

      long getMillis()
      Get the value as the number of milliseconds since the epoch, 1970-01-01T00:00:00Z.
      Returns:
      the value as milliseconds
    • getChronology

      Chronology getChronology()
      Gets the chronology of the instant.

      The Chronology provides conversion from the millisecond value to meaningful fields in a particular calendar system.

      Returns:
      the Chronology, never null
    • getZone

      DateTimeZone getZone()
      Gets the time zone of the instant from the chronology.
      Returns:
      the DateTimeZone that the instant is using, never null
    • get

      int get(DateTimeFieldType type)
      Get the value of one of the fields of a datetime.

      This method uses the chronology of the instant to obtain the value.

      Parameters:
      type - a field type, usually obtained from DateTimeFieldType, not null
      Returns:
      the value of that field
      Throws:
      IllegalArgumentException - if the field type is null
    • isSupported

      boolean isSupported(DateTimeFieldType field)
      Checks whether the field type specified is supported by this implementation.
      Parameters:
      field - the field type to check, may be null which returns false
      Returns:
      true if the field is supported
    • toInstant

      Instant toInstant()
      Get the value as a simple immutable Instant object.

      This can be useful if you don't trust the implementation of the interface to be well-behaved, or to get a guaranteed immutable object.

      Returns:
      the value as an Instant object
    • isEqual

      boolean isEqual(ReadableInstant instant)
      Is this instant equal to the instant passed in comparing solely by millisecond.
      Parameters:
      instant - an instant to check against, null means now
      Returns:
      true if the instant is equal to the instant passed in
    • isAfter

      boolean isAfter(ReadableInstant instant)
      Is this instant after the instant passed in comparing solely by millisecond.
      Parameters:
      instant - an instant to check against, null means now
      Returns:
      true if the instant is after the instant passed in
    • isBefore

      boolean isBefore(ReadableInstant instant)
      Is this instant before the instant passed in comparing solely by millisecond.
      Parameters:
      instant - an instant to check against, null means now
      Returns:
      true if the instant is before the instant passed in
    • equals

      boolean equals(Object readableInstant)
      Compares this object with the specified object for equality based on the millisecond instant and the Chronology. All ReadableInstant instances are accepted.

      To compare two instants for absolute time (ie. UTC milliseconds ignoring the chronology), use isEqual(ReadableInstant) or Comparable.compareTo(T).

      Overrides:
      equals in class Object
      Parameters:
      readableInstant - a readable instant to check against
      Returns:
      true if millisecond and chronology are equal, false if not or the instant is null or of an incorrect type
    • hashCode

      int hashCode()
      Gets a hash code for the instant that is compatible with the equals method.

      The formula used must be as follows:

       ((int) (getMillis() ^ (getMillis() >>> 32))) +
       (getChronology().hashCode())
       
      Overrides:
      hashCode in class Object
      Returns:
      a hash code as defined above
    • toString

      String toString()
      Get the value as a String in a recognisable ISO8601 format.

      The string output is in ISO8601 format to enable the String constructor to correctly parse it.

      Overrides:
      toString in class Object
      Returns:
      the value as an ISO8601 string