Package org.joda.time

Class Partial

java.lang.Object

org.joda.time.base.AbstractPartial

org.joda.time.Partial

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<ReadablePartial>, ReadablePartial

public final class Partial
extends AbstractPartial
implements ReadablePartial, java.io.Serializable

Partial is an immutable partial datetime supporting any set of datetime fields.

A Partial instance can be used to hold any combination of fields. The instance does not contain a time zone, so any datetime is local.

A Partial can be matched against an instant using isMatch(ReadableInstant). This method compares each field on this partial with those of the instant and determines if the partial matches the instant. Given this definition, an empty Partial instance represents any datetime and always matches.

Calculations on Partial are performed using a Chronology. This chronology is set to be in the UTC time zone for all calculations.

Each individual field can be queried in two ways:

• get(DateTimeFieldType.monthOfYear())
• property(DateTimeFieldType.monthOfYear()).get()

The second technique also provides access to other useful methods on the field:

• numeric value - monthOfYear().get()
• text value - monthOfYear().getAsText()
• short text value - monthOfYear().getAsShortText()
• maximum/minimum values - monthOfYear().getMaximumValue()
• add/subtract - monthOfYear().addToCopy()
• set - monthOfYear().setCopy()

Partial is thread-safe and immutable, provided that the Chronology is as well. All standard Chronology classes supplied are thread-safe and immutable.

Since:

1.1

Author:

Stephen Colebourne

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Partial.Property	The property class for Partial.

Constructor Summary

Constructors

Constructor	Description
Partial()	Constructs a Partial with no fields or values, which can be considered to represent any date.
Partial(Chronology chrono)	Constructs a Partial with no fields or values, which can be considered to represent any date.
Partial(DateTimeFieldType[] types, int[] values)	Constructs a Partial with the specified fields and values.
Partial(DateTimeFieldType[] types, int[] values, Chronology chronology)	Constructs a Partial with the specified fields and values.
Partial(DateTimeFieldType type, int value)	Constructs a Partial with the specified field and value.
Partial(DateTimeFieldType type, int value, Chronology chronology)	Constructs a Partial with the specified field and value.
Partial(ReadablePartial partial)	Constructs a Partial by copying all the fields and types from another partial.

Method Summary

Modifier and Type	Method	Description
Chronology	getChronology()	Gets the chronology of the partial which is never null.
protected DateTimeField	getField(int index, Chronology chrono)	Gets the field for a specific index in the chronology specified.
DateTimeFieldType	getFieldType(int index)	Gets the field type at the specified index.
DateTimeFieldType[]	getFieldTypes()	Gets an array of the field type of each of the fields that this partial supports.
DateTimeFormatter	getFormatter()	Gets a formatter suitable for the fields in this partial.
int	getValue(int index)	Gets the value of the field at the specified index.
int[]	getValues()	Gets an array of the value of each of the fields that this partial supports.
boolean	isMatch(ReadableInstant instant)	Does this partial match the specified instant.
boolean	isMatch(ReadablePartial partial)	Does this partial match the specified partial.
Partial	minus(ReadablePeriod period)	Gets a copy of this instance with the specified period take away.
Partial	plus(ReadablePeriod period)	Gets a copy of this instance with the specified period added.
Partial.Property	property(DateTimeFieldType type)	Gets the property object for the specified type, which contains many useful methods for getting and manipulating the partial.
int	size()	Gets the number of fields in this partial.
java.lang.String	toString()	Output the date in an appropriate ISO8601 format.
java.lang.String	toString(java.lang.String pattern)	Output the date using the specified format pattern.
java.lang.String	toString(java.lang.String pattern, java.util.Locale locale)	Output the date using the specified format pattern.
java.lang.String	toStringList()	Gets a string version of the partial that lists all the fields.
Partial	with(DateTimeFieldType fieldType, int value)	Gets a copy of this date with the specified field set to a new value.
Partial	withChronologyRetainFields(Chronology newChronology)	Creates a new Partial instance with the specified chronology.
Partial	withField(DateTimeFieldType fieldType, int value)	Gets a copy of this Partial with the specified field set to a new value.
Partial	withFieldAdded(DurationFieldType fieldType, int amount)	Gets a copy of this Partial with the value of the specified field increased.
Partial	withFieldAddWrapped(DurationFieldType fieldType, int amount)	Gets a copy of this Partial with the value of the specified field increased.
Partial	without(DateTimeFieldType fieldType)	Gets a copy of this date with the specified field removed.
Partial	withPeriodAdded(ReadablePeriod period, int scalar)	Gets a copy of this Partial with the specified period added.

Methods inherited from class org.joda.time.base.AbstractPartial

compareTo, equals, get, getField, getFields, hashCode, indexOf, indexOf, indexOfSupported, indexOfSupported, isAfter, isBefore, isEqual, isSupported, toDateTime, toString

Methods inherited from interface java.lang.Comparable

compareTo

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.joda.time.ReadablePartial

equals, get, getField, hashCode, isSupported, toDateTime

Constructor Detail

Partial

public Partial()

Constructs a Partial with no fields or values, which can be considered to represent any date.

This is most useful when constructing partials, for example:

 Partial p = new Partial()
     .with(DateTimeFieldType.dayOfWeek(), 5)
     .with(DateTimeFieldType.hourOfDay(), 12)
     .with(DateTimeFieldType.minuteOfHour(), 20);
 

Note that, although this is a clean way to write code, it is fairly inefficient internally.

The constructor uses the default ISO chronology.

Partial

public Partial(Chronology chrono)

Constructs a Partial with no fields or values, which can be considered to represent any date.

This is most useful when constructing partials, for example:

 Partial p = new Partial(chrono)
     .with(DateTimeFieldType.dayOfWeek(), 5)
     .with(DateTimeFieldType.hourOfDay(), 12)
     .with(DateTimeFieldType.minuteOfHour(), 20);
 

Note that, although this is a clean way to write code, it is fairly inefficient internally.

Parameters:

chrono - the chronology, null means ISO

Partial

public Partial(DateTimeFieldType type,
               int value)

Constructs a Partial with the specified field and value.

The constructor uses the default ISO chronology.

Parameters:

type - the single type to create the partial from, not null

value - the value to store

Throws:

java.lang.IllegalArgumentException - if the type or value is invalid

Partial

public Partial(DateTimeFieldType type,
               int value,
               Chronology chronology)

Constructs a Partial with the specified field and value.

The constructor uses the specified chronology.

Parameters:

type - the single type to create the partial from, not null

value - the value to store

chronology - the chronology, null means ISO

Throws:

java.lang.IllegalArgumentException - if the type or value is invalid

Partial

public Partial(DateTimeFieldType[] types,
               int[] values)

Constructs a Partial with the specified fields and values. The fields must be specified in the order largest to smallest. For year and weekyear fields with equal duration, year is defined as being larger than weekyear.

The constructor uses the specified chronology.

Parameters:

types - the types to create the partial from, not null

values - the values to store, not null

Throws:

java.lang.IllegalArgumentException - if the types or values are invalid

Partial

public Partial(DateTimeFieldType[] types,
               int[] values,
               Chronology chronology)

Constructs a Partial with the specified fields and values. The fields must be specified in the order largest to smallest. For year and weekyear fields with equal duration, year is defined as being larger than weekyear.

The constructor uses the specified chronology.

Parameters:

types - the types to create the partial from, not null

values - the values to store, not null

chronology - the chronology, null means ISO

Throws:

java.lang.IllegalArgumentException - if the types or values are invalid

Partial

public Partial(ReadablePartial partial)

Constructs a Partial by copying all the fields and types from another partial.

This is most useful when copying from a YearMonthDay or TimeOfDay.

Method Detail

size

public int size()

Gets the number of fields in this partial.

Specified by:

size in interface ReadablePartial

Returns:

the field count

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.

Specified by:

getChronology in interface ReadablePartial

Returns:

the chronology, never null

getField

protected DateTimeField getField(int index,
                                 Chronology chrono)

Gets the field for a specific index in the chronology specified.

Specified by:

getField in class AbstractPartial

Parameters:

index - the index to retrieve

chrono - the chronology to use

Returns:

the field

Throws:

java.lang.IndexOutOfBoundsException - if the index is invalid

getFieldType

public DateTimeFieldType getFieldType(int index)

Gets the field type at the specified index.

Specified by:

getFieldType in interface ReadablePartial

Overrides:

getFieldType in class AbstractPartial

Parameters:

index - the index to retrieve

Returns:

the field at the specified index

Throws:

java.lang.IndexOutOfBoundsException - if the index is invalid

getFieldTypes

public DateTimeFieldType[] getFieldTypes()

Gets an array of the field type of each of the fields that this partial supports.

The fields are returned largest to smallest.

Overrides:

getFieldTypes in class AbstractPartial

Returns:

the array of field types (cloned), largest to smallest

getValue

public int getValue(int index)

Gets the value of the field at the specified index.

Specified by:

getValue in interface ReadablePartial

Parameters:

index - the index

Returns:

the value

Throws:

java.lang.IndexOutOfBoundsException - if the index is invalid

getValues

public int[] getValues()

Gets an array of the value of each of the fields that this partial supports.

The fields are returned largest to smallest. Each value corresponds to the same array index as getFieldTypes()

Overrides:

getValues in class AbstractPartial

Returns:

the current values of each field (cloned), largest to smallest

withChronologyRetainFields

public Partial withChronologyRetainFields(Chronology newChronology)

Creates a new Partial instance with the specified chronology. This instance is immutable and unaffected by this method call.

This method retains the values of the fields, thus the result will typically refer to a different instant.

The time zone of the specified chronology is ignored, as Partial operates without a time zone.

Parameters:

newChronology - the new chronology, null means ISO

Returns:

a copy of this datetime with a different chronology

Throws:

java.lang.IllegalArgumentException - if the values are invalid for the new chronology

with

public Partial with(DateTimeFieldType fieldType,
                    int value)

Gets a copy of this date with the specified field set to a new value.

If this partial did not previously support the field, the new one will. Contrast this behaviour with withField(DateTimeFieldType, int).

For example, if the field type is dayOfMonth then the day would be changed/added in the returned instance.

Parameters:

fieldType - the field type to set, not null

value - the value to set

Returns:

a copy of this instance with the field set

Throws:

java.lang.IllegalArgumentException - if the value is null or invalid

without

public Partial without(DateTimeFieldType fieldType)

Gets a copy of this date with the specified field removed.

If this partial did not previously support the field, no error occurs.

Parameters:

fieldType - the field type to remove, may be null

Returns:

a copy of this instance with the field removed

withField

public Partial withField(DateTimeFieldType fieldType,
                         int value)

Gets a copy of this Partial with the specified field set to a new value.

If this partial does not support the field, an exception is thrown. Contrast this behaviour with with(DateTimeFieldType, int).

For example, if the field type is dayOfMonth then the day would be changed in the returned instance if supported.

Parameters:

fieldType - the field type to set, not null

value - the value to set

Returns:

a copy of this instance with the field set

Throws:

java.lang.IllegalArgumentException - if the value is null or invalid

withFieldAdded

public Partial withFieldAdded(DurationFieldType fieldType,
                              int amount)

Gets a copy of this Partial with the value of the specified field increased. If this partial does not support the field, an exception is thrown.

If the addition is zero, then this is returned. The addition will overflow into larger fields (eg. minute to hour). However, it will not wrap around if the top maximum is reached.

Parameters:

fieldType - the field type to add to, not null

amount - the amount to add

Returns:

a copy of this instance with the field updated

Throws:

java.lang.IllegalArgumentException - if the value is null or invalid

java.lang.ArithmeticException - if the new datetime exceeds the capacity

withFieldAddWrapped

public Partial withFieldAddWrapped(DurationFieldType fieldType,
                                   int amount)

Gets a copy of this Partial with the value of the specified field increased. If this partial does not support the field, an exception is thrown.

If the addition is zero, then this is returned. The addition will overflow into larger fields (eg. minute to hour). If the maximum is reached, the addition will wrap.

Parameters:

fieldType - the field type to add to, not null

amount - the amount to add

Returns:

a copy of this instance with the field updated

Throws:

java.lang.IllegalArgumentException - if the value is null or invalid

java.lang.ArithmeticException - if the new datetime exceeds the capacity

withPeriodAdded

public Partial withPeriodAdded(ReadablePeriod period,
                               int scalar)

Gets a copy of this Partial with the specified period added.

If the addition is zero, then this is returned. Fields in the period that aren't present in the partial are ignored.

This method is typically used to add multiple copies of complex period instances. Adding one field is best achieved using the method withFieldAdded(DurationFieldType, int).

Parameters:

period - the period to add to this one, null means zero

scalar - the amount of times to add, such as -1 to subtract once

Returns:

a copy of this instance with the period added

Throws:

java.lang.ArithmeticException - if the new datetime exceeds the capacity

plus

public Partial plus(ReadablePeriod period)

Gets a copy of this instance with the specified period added.

If the amount is zero or null, then this is returned.

Parameters:

period - the duration to add to this one, null means zero

Returns:

a copy of this instance with the period added

Throws:

java.lang.ArithmeticException - if the new datetime exceeds the capacity of a long

minus

public Partial minus(ReadablePeriod period)

Gets a copy of this instance with the specified period take away.

If the amount is zero or null, then this is returned.

Parameters:

period - the period to reduce this instant by

Returns:

a copy of this instance with the period taken away

Throws:

java.lang.ArithmeticException - if the new datetime exceeds the capacity of a long

property

public Partial.Property property(DateTimeFieldType type)

Gets the property object for the specified type, which contains many useful methods for getting and manipulating the partial.

See also ReadablePartial.get(DateTimeFieldType).

Parameters:

type - the field type to get the property for, not null

Returns:

the property object

Throws:

java.lang.IllegalArgumentException - if the field is null or unsupported

isMatch

public boolean isMatch(ReadableInstant instant)

Does this partial match the specified instant.

A match occurs when all the fields of this partial are the same as the corresponding fields on the specified instant.

Parameters:

instant - an instant to check against, null means now in default zone

Returns:

true if this partial matches the specified instant

isMatch

public boolean isMatch(ReadablePartial partial)

Does this partial match the specified partial.

A match occurs when all the fields of this partial are the same as the corresponding fields on the specified partial.

Parameters:

partial - a partial to check against, must not be null

Returns:

true if this partial matches the specified partial

Throws:

java.lang.IllegalArgumentException - if the partial is null

java.lang.IllegalArgumentException - if the fields of the two partials do not match

Since:

1.5

getFormatter

public DateTimeFormatter getFormatter()

Gets a formatter suitable for the fields in this partial.

If there is no appropriate ISO format, null is returned. This method may return a formatter that does not display all the fields of the partial. This might occur when you have overlapping fields, such as dayOfWeek and dayOfMonth.

Returns:

a formatter suitable for the fields in this partial, null if none is suitable

toString

public java.lang.String toString()

Output the date in an appropriate ISO8601 format.

This method will output the partial in one of two ways. If getFormatter()

If there is no appropriate ISO format a dump of the fields is output via toStringList().

Specified by:

toString in interface ReadablePartial

Overrides:

toString in class java.lang.Object

Returns:

ISO8601 formatted string

toStringList

public java.lang.String toStringList()

Gets a string version of the partial that lists all the fields.

This method exists to provide a better debugging toString than the standard toString. This method lists all the fields and their values in a style similar to the collections framework.

Returns:

a toString format that lists all the fields

toString

public java.lang.String toString(java.lang.String pattern)

Output the date using the specified format pattern. Unsupported fields will appear as special unicode characters.

Parameters:

pattern - the pattern specification, null means use toString

See Also:

DateTimeFormat

toString

public java.lang.String toString(java.lang.String pattern,
                                 java.util.Locale locale)

Output the date using the specified format pattern. Unsupported fields will appear as special unicode characters.

Parameters:

pattern - the pattern specification, null means use toString

locale - Locale to use, null means default

See Also:

DateTimeFormat