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/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *  * Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 *

 *  * Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 *

 *  * Neither the name of JSR-310 nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

package java.time.format;

import java.util.Calendar;

/**

 * Enumeration of the style of text formatting and parsing.

 * <p>

 * Text styles define three sizes for the formatted text - 'full', 'short' and 'narrow'.

 * Each of these three sizes is available in both 'standard' and 'stand-alone' variations.

 * <p>

 * The difference between the three sizes is obvious in most languages.

 * For example, in English the 'full' month is 'January', the 'short' month is 'Jan'

 * and the 'narrow' month is 'J'. Note that the narrow size is often not unique.

 * For example, 'January', 'June' and 'July' all have the 'narrow' text 'J'.

 * <p>

 * The difference between the 'standard' and 'stand-alone' forms is trickier to describe

 * as there is no difference in English. However, in other languages there is a difference

 * in the word used when the text is used alone, as opposed to in a complete date.

 * For example, the word used for a month when used alone in a date picker is different

 * to the word used for month in association with a day and year in a date.

 *

 * @implSpec

 * This is an immutable and thread-safe enum.

 *

 * @since 1.8

 */

public enum TextStyle {

    // ordered from large to small

    // ordered so that bit 0 of the ordinal indicates stand-alone.

    /**

     * Full text, typically the full description.

     * For example, day-of-week Monday might output "Monday".

     */

    FULL(Calendar.LONG_FORMAT, 0),

    /**

     * Full text for stand-alone use, typically the full description.

     * For example, day-of-week Monday might output "Monday".

     */

    FULL_STANDALONE(Calendar.LONG_STANDALONE, 0),

    /**

     * Short text, typically an abbreviation.

     * For example, day-of-week Monday might output "Mon".

     */

    SHORT(Calendar.SHORT_FORMAT, 1),

    /**

     * Short text for stand-alone use, typically an abbreviation.

     * For example, day-of-week Monday might output "Mon".

     */

    SHORT_STANDALONE(Calendar.SHORT_STANDALONE, 1),

    /**

     * Narrow text, typically a single letter.

     * For example, day-of-week Monday might output "M".

     */

    NARROW(Calendar.NARROW_FORMAT, 1),

    /**

     * Narrow text for stand-alone use, typically a single letter.

     * For example, day-of-week Monday might output "M".

     */

    NARROW_STANDALONE(Calendar.NARROW_STANDALONE, 1);

    private final int calendarStyle;

    private final int zoneNameStyleIndex;

    private TextStyle(int calendarStyle, int zoneNameStyleIndex) {

        this.calendarStyle = calendarStyle;

        this.zoneNameStyleIndex = zoneNameStyleIndex;

    }

    /**

     * Returns true if the Style is a stand-alone style.

     * @return true if the style is a stand-alone style.

     */

    public boolean isStandalone() {

        return (ordinal() & 1) == 1;

    }

    /**

     * Returns the stand-alone style with the same size.

     * @return the stand-alone style with the same size

     */

    public TextStyle asStandalone() {

        return TextStyle.values()[ordinal()  | 1];

    }

    /**

     * Returns the normal style with the same size.

     *

     * @return the normal style with the same size

     */

    public TextStyle asNormal() {

        return TextStyle.values()[ordinal() & ~1];

    }

    /**

     * Returns the {@code Calendar} style corresponding to this {@code TextStyle}.

     *

     * @return the corresponding {@code Calendar} style

     */

    int toCalendarStyle() {

        return calendarStyle;

    }

    /**

     * Returns the relative index value to an element of the {@link

     * java.text.DateFormatSymbols#getZoneStrings() DateFormatSymbols.getZoneStrings()}

     * value, 0 for long names and 1 for short names (abbreviations). Note that these values

     * do <em>not</em> correspond to the {@link java.util.TimeZone#LONG} and {@link

     * java.util.TimeZone#SHORT} values.

     *

     * @return the relative index value to time zone names array

     */

    int zoneNameStyleIndex() {

        return zoneNameStyleIndex;

    }

}