org.joda.time
Interface ReadablePartial

All Known Implementing Classes:

AbstractPartial, BasePartial, LocalDate, LocalDateTime, LocalTime, Partial, TimeOfDay, YearMonthDay

public interface ReadablePartial

Defines a partial time that does not support every datetime field, and is thus a local time.

A ReadablePartial supports a subset of those fields on the chronology. It cannot be compared to a ReadableInstant, as it does not fully specify an instant in time. The time it does specify is a local time, and does not include a time zone.

A ReadablePartial can be converted to a ReadableInstant using the toDateTime method. This works by providing a full base instant that can be used to 'fill in the gaps' and specify a time zone.

Since:

1.0

Author:

Stephen Colebourne

Method Summary

boolean	equals(Object partial) Compares this partial with the specified object for equality based on the supported fields, chronology and values.
int	get(DateTimeFieldType field) Gets the value of one of the fields.
Chronology	getChronology() Gets the chronology of the partial which is never null.
DateTimeField	getField(int index) Gets the field at the specified index.
DateTimeFieldType	getFieldType(int index) Gets the field type at the specified index.
int	getValue(int index) Gets the value at the specified index.
int	hashCode() Gets a hash code for the partial that is compatible with the equals method.
boolean	isSupported(DateTimeFieldType field) Checks whether the field type specified is supported by this partial.
int	size() Gets the number of fields that this partial supports.
DateTime	toDateTime(ReadableInstant baseInstant) Converts this partial to a full datetime by resolving it against another datetime.
String	toString() Get the value as a String in a recognisable ISO8601 format, only displaying supported fields.

Method Detail

size

public int size()

Gets the number of fields that this partial supports.

Returns:

the number of fields supported

getFieldType

public DateTimeFieldType getFieldType(int index)

Gets the field type at the specified index.

Parameters:

index - the index to retrieve

Returns:

the field at the specified index

Throws:

IndexOutOfBoundsException - if the index is invalid

getField

public DateTimeField getField(int index)

Gets the field at the specified index.

Parameters:

index - the index to retrieve

Returns:

the field at the specified index

Throws:

IndexOutOfBoundsException - if the index is invalid

getValue

public int getValue(int index)

Gets the value at the specified index.

Parameters:

index - the index to retrieve

Returns:

the value of the field at the specified index

Throws:

IndexOutOfBoundsException - if the index is invalid

getChronology

public Chronology getChronology()

Gets the chronology of the partial which is never null.

The Chronology is the calculation engine behind the partial and provides conversion and validation of the fields in a particular calendar system.

Returns:

the chronology, never null

get

public int get(DateTimeFieldType field)

Gets the value of one of the fields.

The field type specified must be one of those that is supported by the partial.

Parameters:

field - a DateTimeFieldType instance that is supported by this partial

Returns:

the value of that field

Throws:

IllegalArgumentException - if the field is null or not supported

isSupported

public boolean isSupported(DateTimeFieldType field)

Checks whether the field type specified is supported by this partial.

Parameters:

field - the field to check, may be null which returns false

Returns:

true if the field is supported

toDateTime

public DateTime toDateTime(ReadableInstant baseInstant)

Converts this partial to a full datetime by resolving it against another datetime.

This method takes the specified datetime and sets the fields from this instant on top. The chronology from the base instant is used.

For example, if this partial represents a time, then the result of this method will be the datetime from the specified base instant plus the time from this partial.

Parameters:

baseInstant - the instant that provides the missing fields, null means now

Returns:

the combined datetime

equals

public boolean equals(Object partial)

Compares this partial with the specified object for equality based on the supported fields, chronology and values.

Two instances of ReadablePartial are equal if they have the same chronology, same field types (in same order) and same values.

Parameters:

partial - the object to compare to

Returns:

true if equal

hashCode

public int hashCode()

Gets a hash code for the partial that is compatible with the equals method.

The formula used must be:

  int total = 157;
  for (int i = 0; i < fields.length; i++) {
      total = 23 * total + values[i];
      total = 23 * total + fieldTypes[i].hashCode();
  }
  total += chronology.hashCode();
  return total;
 

Returns:

a suitable hash code

toString

public String toString()

Get the value as a String in a recognisable ISO8601 format, only displaying supported fields.

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

Returns:

the value as an ISO8601 string