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⏎ java/util/spi/CalendarNameProvider.java

/*
 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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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.
 *
 * <p><a id="calendartypes"><b>Calendar Types</b></a>
 *
 * <p>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.
 *
 * <p><b>Calendar Fields</b>
 *
 * <p>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.
 *
 * <table class="striped">
 * <caption style="display:none">Field values</caption>
 * <thead>
 *   <tr>
 *     <th scope="col">Field</th>
 *     <th scope="col">Value</th>
 *     <th scope="col">Description</th>
 *   </tr>
 * </thead>
 * <tbody>
 *   <tr>
 *     <th scope="row" style="vertical-align:top">{@link Calendar#MONTH}</th>
 *     <td style="vertical-align:top">{@link Calendar#JANUARY} to {@link Calendar#UNDECIMBER}</td>
 *     <td>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.</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="vertical-align:top">{@link Calendar#DAY_OF_WEEK}</th>
 *     <td style="vertical-align:top">{@link Calendar#SUNDAY} to {@link Calendar#SATURDAY}</td>
 *     <td>Day-of-week numbering is 1-based starting from Sunday (i.e., 1 - Sunday,
 *         ..., 7 - Saturday).</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="vertical-align:top">{@link Calendar#AM_PM}</th>
 *     <td style="vertical-align:top">{@link Calendar#AM} to {@link Calendar#PM}</td>
 *     <td>0 - AM, 1 - PM</td>
 *   </tr>
 * </tbody>
 * </table>
 *
 * <p style="margin-top:20px">The following are calendar-specific fields and their values to be supported.
 *
 * <table class="plain">
 * <caption style="display:none">Calendar type and field values</caption>
 * <thead>
 *   <tr>
 *     <th scope="col">Calendar Type</th>
 *     <th scope="col">Field</th>
 *     <th scope="col">Value</th>
 *     <th scope="col">Description</th>
 *   </tr>
 * </thead>
 * <tbody>
 *   <tr>
 *     <th scope="row"rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@code "gregory"}</th>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@link Calendar#ERA}</th>
 *     <th scope="row" style="font-weight:normal">0</th>
 *     <td>{@link java.util.GregorianCalendar#BC} (BCE)</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">1</th>
 *     <td>{@link java.util.GregorianCalendar#AD} (CE)</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@code "buddhist"}</th>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@link Calendar#ERA}</th>
 *     <th scope="row" style="font-weight:normal">0</th>
 *     <td>BC (BCE)</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">1</th>
 *     <td>B.E. (Buddhist Era)</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" rowspan="6" style="font-weight:normal; text-align:left; vertical-align:top">{@code "japanese"}</th>
 *     <th scope="row" rowspan="5" style="font-weight:normal; text-align:left; vertical-align:top">{@link Calendar#ERA}</th>
 *     <th scope="row" style="font-weight:normal">0</th>
 *     <td>Seireki (Before Meiji)</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">1</th>
 *     <td>Meiji</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">2</th>
 *     <td>Taisho</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">3</th>
 *     <td>Showa</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">4</th>
 *     <td >Heisei</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal; text-align:left; vertical-align:top">{@link Calendar#YEAR}</th>
 *     <th scope="row" style="font-weight:normal">1</th>
 *     <td>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 <a href="../../text/SimpleDateFormat.html#year">
 *     Year representation in {@code SimpleDateFormat}</a>.</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@code "roc"}</th>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@link Calendar#ERA}</th>
 *     <th scope="row" style="font-weight:normal">0</th>
 *     <td>Before R.O.C.</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">1</th>
 *     <td>R.O.C.</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@code "islamic"}</th>
 *     <th scope="row" rowspan="2" style="font-weight:normal; text-align:left; vertical-align:top">{@link Calendar#ERA}</th>
 *     <th scope="row" style="font-weight:normal">0</th>
 *     <td>Before AH</td>
 *   </tr>
 *   <tr>
 *     <th scope="row" style="font-weight:normal">1</th>
 *     <td>Anno Hijrah (AH)</td>
 *   </tr>
 * </tbody>
 * </table>
 *
 * <p>Calendar field value names for {@code "gregory"} must be consistent with
 * the date-time symbols provided by {@link java.text.spi.DateFormatSymbolsProvider}.
 *
 * <p>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</code> in the given <code>style</code> and
     * <code>locale</code>.  If no string representation is
     * applicable, <code>null</code> is returned.
     *
     * <p>{@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 <em>not</em> supported by this
     * method. {@code null} must be returned if any time zone fields are
     * specified.
     *
     * <p>{@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).
     *
     * <p>{@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}.
     *
     * <p>For example, the following call will return {@code "Sunday"}.
     * <pre>
     * getDisplayName("gregory", Calendar.DAY_OF_WEEK, Calendar.SUNDAY,
     *                Calendar.LONG_STANDALONE, Locale.ENGLISH);
     * </pre>
     *
     * @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.
     *
     * <p>{@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 <em>not</em> supported by this
     * method. {@code null} must be returned if any time zone fields are specified.
     *
     * <p>{@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.
     *
     * <p>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.
     * <pre>
     * getDisplayNames("gregory", Calendar.MONTH, Calendar.ALL_STYLES, Locale.ENGLISH);
     * </pre>
     *
     * @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<String, Integer> getDisplayNames(String calendarType,
                                                         int field, int style,
                                                         Locale locale);
}

⏎ java/util/spi/CalendarNameProvider.java

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Release date: 2018-11-04
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