java.util.spi.CalendarNameProvider Maven / Gradle / Ivy
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package java.util.spi;
import java.util.Calendar;
import java.util.Locale;
import java.util.Map;
/**
* An abstract class for service providers that provide localized string
* representations (display names) of {@code Calendar} field values.
*
* Calendar Types
*
*
Calendar types are used to specify calendar systems for which the {@link
* #getDisplayName(String, int, int, int, Locale) getDisplayName} and {@link
* #getDisplayNames(String, int, int, Locale) getDisplayNames} methods provide
* calendar field value names. See {@link Calendar#getCalendarType()} for details.
*
*
Calendar Fields
*
*
Calendar fields are specified with the constants defined in {@link
* Calendar}. The following are calendar-common fields and their values to be
* supported for each calendar system.
*
*
*
*
*
* Field
* Value
* Description
*
*
*
*
* {@link Calendar#MONTH}
* {@link Calendar#JANUARY} to {@link Calendar#UNDECIMBER}
* Month numbering is 0-based (e.g., 0 - January, ..., 11 -
* December). Some calendar systems have 13 months. Month
* names need to be supported in both the formatting and
* stand-alone forms if required by the supported locales. If there's
* no distinction in the two forms, the same names should be returned
* in both of the forms.
*
*
* {@link Calendar#DAY_OF_WEEK}
* {@link Calendar#SUNDAY} to {@link Calendar#SATURDAY}
* Day-of-week numbering is 1-based starting from Sunday (i.e., 1 - Sunday,
* ..., 7 - Saturday).
*
*
* {@link Calendar#AM_PM}
* {@link Calendar#AM} to {@link Calendar#PM}
* 0 - AM, 1 - PM
*
*
*
*
* The following are calendar-specific fields and their values to be supported.
*
*
*
*
*
* Calendar Type
* Field
* Value
* Description
*
*
*
*
* {@code "gregory"}
* {@link Calendar#ERA}
* 0
* {@link java.util.GregorianCalendar#BC} (BCE)
*
*
* 1
* {@link java.util.GregorianCalendar#AD} (CE)
*
*
* {@code "buddhist"}
* {@link Calendar#ERA}
* 0
* BC (BCE)
*
*
* 1
* B.E. (Buddhist Era)
*
*
* {@code "japanese"}
* {@link Calendar#ERA}
* 0
* Seireki (Before Meiji)
*
*
* 1
* Meiji
*
*
* 2
* Taisho
*
*
* 3
* Showa
*
*
* 4
* Heisei
*
*
* 5
* Reiwa
*
*
* {@link Calendar#YEAR}
* 1
* the first year in each era. It should be returned when a long
* style ({@link Calendar#LONG_FORMAT} or {@link Calendar#LONG_STANDALONE}) is
* specified. See also the
* Year representation in {@code SimpleDateFormat}.
*
*
* {@code "roc"}
* {@link Calendar#ERA}
* 0
* Before R.O.C.
*
*
* 1
* R.O.C.
*
*
* {@code "islamic"}
* {@link Calendar#ERA}
* 0
* Before AH
*
*
* 1
* Anno Hijrah (AH)
*
*
*
*
* Calendar field value names for {@code "gregory"} must be consistent with
* the date-time symbols provided by {@link java.text.spi.DateFormatSymbolsProvider}.
*
*
Time zone names are supported by {@link TimeZoneNameProvider}.
*
* @author Masayoshi Okutsu
* @since 1.8
* @see CalendarDataProvider
* @see Locale#getUnicodeLocaleType(String)
*/
public abstract class CalendarNameProvider extends LocaleServiceProvider {
/**
* Sole constructor. (For invocation by subclass constructors, typically
* implicit.)
*/
protected CalendarNameProvider() {
}
/**
* Returns the string representation (display name) of the calendar
* {@code field value} in the given {@code style} and
* {@code locale}. If no string representation is
* applicable, {@code null} is returned.
*
*
{@code field} is a {@code Calendar} field index, such as {@link
* Calendar#MONTH}. The time zone fields, {@link Calendar#ZONE_OFFSET} and
* {@link Calendar#DST_OFFSET}, are not supported by this
* method. {@code null} must be returned if any time zone fields are
* specified.
*
*
{@code value} is the numeric representation of the {@code field} value.
* For example, if {@code field} is {@link Calendar#DAY_OF_WEEK}, the valid
* values are {@link Calendar#SUNDAY} to {@link Calendar#SATURDAY}
* (inclusive).
*
*
{@code style} gives the style of the string representation. It is one
* of {@link Calendar#SHORT_FORMAT} ({@link Calendar#SHORT SHORT}),
* {@link Calendar#SHORT_STANDALONE}, {@link Calendar#LONG_FORMAT}
* ({@link Calendar#LONG LONG}), {@link Calendar#LONG_STANDALONE},
* {@link Calendar#NARROW_FORMAT}, or {@link Calendar#NARROW_STANDALONE}.
*
*
For example, the following call will return {@code "Sunday"}.
*
* getDisplayName("gregory", Calendar.DAY_OF_WEEK, Calendar.SUNDAY,
* Calendar.LONG_STANDALONE, Locale.ENGLISH);
*
*
* @param calendarType
* the calendar type. (Any calendar type given by {@code locale}
* is ignored.)
* @param field
* the {@code Calendar} field index,
* such as {@link Calendar#DAY_OF_WEEK}
* @param value
* the value of the {@code Calendar field},
* such as {@link Calendar#MONDAY}
* @param style
* the string representation style: one of {@link
* Calendar#SHORT_FORMAT} ({@link Calendar#SHORT SHORT}),
* {@link Calendar#SHORT_STANDALONE}, {@link
* Calendar#LONG_FORMAT} ({@link Calendar#LONG LONG}),
* {@link Calendar#LONG_STANDALONE},
* {@link Calendar#NARROW_FORMAT},
* or {@link Calendar#NARROW_STANDALONE}
* @param locale
* the desired locale
* @return the string representation of the {@code field value}, or {@code
* null} if the string representation is not applicable or
* the given calendar type is unknown
* @throws IllegalArgumentException
* if {@code field} or {@code style} is invalid
* @throws NullPointerException if {@code locale} is {@code null}
* @see TimeZoneNameProvider
* @see java.util.Calendar#get(int)
* @see java.util.Calendar#getDisplayName(int, int, Locale)
*/
public abstract String getDisplayName(String calendarType,
int field, int value,
int style, Locale locale);
/**
* Returns a {@code Map} containing all string representations (display
* names) of the {@code Calendar} {@code field} in the given {@code style}
* and {@code locale} and their corresponding field values.
*
* {@code field} is a {@code Calendar} field index, such as {@link
* Calendar#MONTH}. The time zone fields, {@link Calendar#ZONE_OFFSET} and
* {@link Calendar#DST_OFFSET}, are not supported by this
* method. {@code null} must be returned if any time zone fields are specified.
*
*
{@code style} gives the style of the string representation. It must be
* one of {@link Calendar#ALL_STYLES}, {@link Calendar#SHORT_FORMAT} ({@link
* Calendar#SHORT SHORT}), {@link Calendar#SHORT_STANDALONE}, {@link
* Calendar#LONG_FORMAT} ({@link Calendar#LONG LONG}), {@link
* Calendar#LONG_STANDALONE}, {@link Calendar#NARROW_FORMAT}, or
* {@link Calendar#NARROW_STANDALONE}. Note that narrow names may
* not be unique due to use of single characters, such as "S" for Sunday
* and Saturday, and that no narrow names are included in that case.
*
*
For example, the following call will return a {@code Map} containing
* {@code "January"} to {@link Calendar#JANUARY}, {@code "Jan"} to {@link
* Calendar#JANUARY}, {@code "February"} to {@link Calendar#FEBRUARY},
* {@code "Feb"} to {@link Calendar#FEBRUARY}, and so on.
*
* getDisplayNames("gregory", Calendar.MONTH, Calendar.ALL_STYLES, Locale.ENGLISH);
*
*
* @param calendarType
* the calendar type. (Any calendar type given by {@code locale}
* is ignored.)
* @param field
* the calendar field for which the display names are returned
* @param style
* the style applied to the display names; one of
* {@link Calendar#ALL_STYLES}, {@link Calendar#SHORT_FORMAT}
* ({@link Calendar#SHORT SHORT}), {@link
* Calendar#SHORT_STANDALONE}, {@link Calendar#LONG_FORMAT}
* ({@link Calendar#LONG LONG}), {@link Calendar#LONG_STANDALONE},
* {@link Calendar#NARROW_FORMAT},
* or {@link Calendar#NARROW_STANDALONE}
* @param locale
* the desired locale
* @return a {@code Map} containing all display names of {@code field} in
* {@code style} and {@code locale} and their {@code field} values,
* or {@code null} if no display names are defined for {@code field}
* @throws NullPointerException
* if {@code locale} is {@code null}
* @see Calendar#getDisplayNames(int, int, Locale)
*/
public abstract Map getDisplayNames(String calendarType,
int field, int style,
Locale locale);
}