Package net.time4j.engine

Class BridgeChronology<S,T extends ChronoEntity<T>>

java.lang.Object

net.time4j.engine.Chronology<S>

net.time4j.engine.BridgeChronology<S,T>

Type Parameters:

S - generic type of foreign temporal type

T - generic type compatible to ChronoEntity

All Implemented Interfaces:

ChronoMerger<S>

public final class BridgeChronology<S,T extends ChronoEntity<T>>
extends Chronology<S>

Represents a foreign chronology which delegates formatting and parsing to a chronology in Time4J.

A ChronoFormatter can be created by help of this chronology such that the formatter can be adjusted to any foreign type without external conversion.

Important to know: This chronology does not register any elements and is also not registered itself so Chronology.lookup(...) will inevitably fail to find this chronology.

Since:

3.24/4.20

Author:

Meno Hochschild

See Also:

TemporalType

Nested Class Summary

Nested classes/interfaces inherited from class net.time4j.engine.Chronology

Chronology.Builder<T extends ChronoEntity<T>>

Constructor Summary

Constructors

Constructor	Description
BridgeChronology(Converter<S,T> converter, Chronology<T> delegate)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
S	createFrom(TimeSource<?> clock, AttributeQuery attributes)	Creates a new entity which reflects current time.
S	createFrom(ChronoEntity<?> entity, AttributeQuery attributes, boolean lenient, boolean preparsing)	Creates a new entity of type T based on given chronological data.
CalendarSystem<S>	getCalendarSystem()	Returns the associated calendar system if available.
CalendarSystem<S>	getCalendarSystem(String variant)	Returns the calendar system for given calendar variant if available.
int	getDefaultPivotYear()	Determines the default pivot year which might be calendar specific and serves for the formatting of two-digit-years.
StartOfDay	getDefaultStartOfDay()	Determines the default start of day.
List<ChronoExtension>	getExtensions()	Returns all registered chronological extensions.
String	getFormatPattern(FormatStyle style, Locale locale)	Not supported for foreign types.
Set<ChronoElement<?>>	getRegisteredElements()	Returns all registered chronological elements.
boolean	hasCalendarSystem()	Queries if this chronology has a calendar system.
boolean	isSupported(ChronoElement<?> element)	This chronology does not itself support any elements.
ChronoDisplay	preformat(S context, AttributeQuery attributes)	Transforms the current context/entity into another set of chronological values which finally shall be formatted using given attributes.
Chronology<?>	preparser()	This method defines a child chronology which can preparse a chronological text.

Methods inherited from class net.time4j.engine.Chronology

getCalendarSystem, getChronoType, isRegistered, lookup

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.time4j.engine.ChronoMerger

getFormatPattern

Constructor Details

BridgeChronology

public BridgeChronology(Converter<S,T> converter,
 Chronology<T> delegate)

Constructs a new instance.

Parameters:

converter - used in any type conversion, should be stateless

delegate - delegate chronology in Time4J

Method Details

createFrom

public S createFrom(TimeSource<?> clock,
 AttributeQuery attributes)

Description copied from interface: ChronoMerger

Creates a new entity which reflects current time.

In a date-only chronology this method will create the current date using the necessary timezone contained in given attributes.

Specified by:

createFrom in interface ChronoMerger<S>

Overrides:

createFrom in class Chronology<S>

Parameters:

clock - source for current time

attributes - configuration attributes which might contain the timezone to translate current time to local time

Returns:

new time context or null if given data are insufficient

createFrom

public S createFrom(ChronoEntity<?> entity,
 AttributeQuery attributes,
 boolean lenient,
 boolean preparsing)

Description copied from interface: ChronoMerger

Creates a new entity of type T based on given chronological data.

Typically the method will query the given entity with different priorities for elements which can compose a new chronological entity (per group). For example a calendar date can be composed either by epoch days or the group (year)-(month)-(day-of-month) or the group (year)-(day-of-year) etc.

A text parser will call this method after having resolved a text into single chronological elements and values. Implementations should always validate the parsed values. In case of error, they are free to either throw an IllegalArgumentException or to generate and to save an error message by mean of the expression entity.with(ValidationElement.ERROR_MESSAGE, message.

Specified by:

createFrom in interface ChronoMerger<S>

Overrides:

createFrom in class Chronology<S>

Parameters:

entity - any chronological entity like parsed elements with their values

attributes - configuration attributes given by parser

lenient - controls the leniency how to interprete invalid values

preparsing - preparsing phase active?

Returns:

new time context or null if given data are insufficient

See Also:

ValidationElement.ERROR_MESSAGE

preformat

public ChronoDisplay preformat(S context,
 AttributeQuery attributes)

Description copied from interface: ChronoMerger

Transforms the current context/entity into another set of chronological values which finally shall be formatted using given attributes.

Specified by:

preformat in interface ChronoMerger<S>

Overrides:

preformat in class Chronology<S>

Parameters:

context - actual chronological context to be formatted

attributes - controls attributes during formatting

Returns:

replacement entity which will finally be used for formatting

preparser

public Chronology<?> preparser()

Description copied from interface: ChronoMerger

This method defines a child chronology which can preparse a chronological text.

Specified by:

preparser in interface ChronoMerger<S>

Overrides:

preparser in class Chronology<S>

Returns:

preparsing chronology or null (default)

getFormatPattern

public String getFormatPattern(FormatStyle style,
 Locale locale)

Not supported for foreign types.

Specified by:

getFormatPattern in interface ChronoMerger<S>

Overrides:

getFormatPattern in class Chronology<S>

Parameters:

style - format style

locale - language and country setting

Returns:

nothing

Throws:

UnsupportedOperationException - always

See Also:

LocalizedPatternSupport

getDefaultStartOfDay

public StartOfDay getDefaultStartOfDay()

Description copied from interface: ChronoMerger

Determines the default start of day.

Specified by:

getDefaultStartOfDay in interface ChronoMerger<S>

Overrides:

getDefaultStartOfDay in class Chronology<S>

Returns:

start of day

getDefaultPivotYear

public int getDefaultPivotYear()

Description copied from interface: ChronoMerger

Determines the default pivot year which might be calendar specific and serves for the formatting of two-digit-years.

Most calendar chronologies should choose a pivot year 20 years in the future. The standard implementation is based on the gregorian calendar. If an implementation returns the value 100 then the formatting of two-digit-years is effectively switched off.

Specified by:

getDefaultPivotYear in interface ChronoMerger<S>

Overrides:

getDefaultPivotYear in class Chronology<S>

Returns:

default pivot year (must not be smaller than 100)

hasCalendarSystem

public boolean hasCalendarSystem()

Description copied from class: Chronology

Queries if this chronology has a calendar system.

Overrides:

hasCalendarSystem in class Chronology<S>

Returns:

true if this chronology has a calendar system else false

See Also:

Chronology.getCalendarSystem()

getCalendarSystem

public CalendarSystem<S> getCalendarSystem()

Description copied from class: Chronology

Returns the associated calendar system if available.

Overrides:

getCalendarSystem in class Chronology<S>

Returns:

calendar system, not null

See Also:

Chronology.hasCalendarSystem()

getCalendarSystem

public CalendarSystem<S> getCalendarSystem(String variant)

Description copied from class: Chronology

Returns the calendar system for given calendar variant if available.

Overrides:

getCalendarSystem in class Chronology<S>

Parameters:

variant - name of calendar variant

Returns:

calendar system, not null

See Also:

VariantSource.getVariant()

isSupported

public boolean isSupported(ChronoElement<?> element)

This chronology does not itself support any elements.

Only its delegate chronology might support given element.

Overrides:

isSupported in class Chronology<S>

Parameters:

element - element to be asked (optional)

Returns:

false

getRegisteredElements

public Set<ChronoElement<?>> getRegisteredElements()

Description copied from class: Chronology

Returns all registered chronological elements.

Overrides:

getRegisteredElements in class Chronology<S>

Returns:

unmodifiable set of elements without duplicates

getExtensions

public List<ChronoExtension> getExtensions()

Description copied from class: Chronology

Returns all registered chronological extensions.

This method will be called by format-API in order to collect all extension elements which are relevant for formatting.

Overrides:

getExtensions in class Chronology<S>

Returns:

unmodifiable list of extensions