java/text/DateFormatSymbols.java

/* ChoiceFormat.java -- Format over a range of numbers
   Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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permission to link this library with independent modules to produce an
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package java.text;

import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * This class acts as container for locale specific date/time formatting
 * information such as the days of the week and the months of the year.
 * @author Per Bothner <bothner@cygnus.com>
 * @date October 24, 1998.
 */
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3.
 * Status:  Believed complete and correct.
 */
public class DateFormatSymbols implements java.io.Serializable, Cloneable
{
  String[] ampms;
  String[] eras;
  private String localPatternChars;
  String[] months;
  String[] shortMonths;
  String[] shortWeekdays;
  String[] weekdays;
  private String[][] zoneStrings;

  private static final long serialVersionUID = -5987973545549424702L;

  // The order of these prefixes must be the same as in DateFormat
  private static final String[] formatPrefixes =
  {
    "full", "long", "medium", "short"
  };

  // These are each arrays with a value for SHORT, MEDIUM, LONG, FULL,
  // and DEFAULT (constants defined in java.text.DateFormat).  While
  // not part of the official spec, we need a way to get at locale-specific
  // default formatting patterns.  They are declared package scope so
  // as to be easily accessible where needed (DateFormat, SimpleDateFormat).
  transient String[] dateFormats;
  transient String[] timeFormats;

  private String[] formatsForKey(ResourceBundle res, String key)
  {
    String[] values = new String [formatPrefixes.length];
    for (int i = 0; i < formatPrefixes.length; i++)
      {
        values[i] = res.getString(formatPrefixes[i]+key);
      }
    return values;
  }

  /**
   * This method initializes a new instance of <code>DateFormatSymbols</code>
   * by loading the date format information for the specified locale.
   *
   * @param locale The locale for which date formatting symbols should
   *               be loaded.
   */
  public DateFormatSymbols (Locale locale) throws MissingResourceException
  {
    ResourceBundle res
      = ResourceBundle.getBundle("gnu.java.locale.LocaleInformation", locale);

    ampms = res.getStringArray ("ampms");
    eras = res.getStringArray ("eras");
    localPatternChars = res.getString ("localPatternChars");
    months = res.getStringArray ("months");
    shortMonths = res.getStringArray ("shortMonths");
    shortWeekdays = res.getStringArray ("shortWeekdays");
    weekdays = res.getStringArray ("weekdays");
    zoneStrings = (String[][]) res.getObject ("zoneStrings");

    dateFormats = formatsForKey(res, "DateFormat");
    timeFormats = formatsForKey(res, "TimeFormat");
  }

  /**
   * This method loads the format symbol information for the default
   * locale.
   */
  public DateFormatSymbols () throws MissingResourceException
  {
    this (Locale.getDefault());
  }

  /**
   * This method returns the list of strings used for displaying AM or PM.
   * This is a two element <code>String</code> array indexed by
   * <code>Calendar.AM</code> and <code>Calendar.PM</code>
   *
   * @return The list of AM/PM display strings.
   */
  public String[] getAmPmStrings()
  {
    return ampms;
  }

  /**
    * This method returns the list of strings used for displaying eras
    * (e.g., "BC" and "AD").  This is a two element <code>String</code>
    * array indexed by <code>Calendar.BC</code> and <code>Calendar.AD</code>.
    *
    * @return The list of era disply strings.
    */
  public String[] getEras()
  {
    return eras;
  }

  /**
    * This method returns the pattern character information for this
    * object.  This is an 18 character string that contains the characters
    * that are used in creating the date formatting strings in
    * <code>SimpleDateFormat</code>.   The following are the character
    * positions in the string and which format character they correspond
    * to (the character in parentheses is the default value in the US English
    * locale):
    * <p>
    * <ul>
    * <li>0 - era (G)</li>
    * <li>1 - year (y)</li>
    * <li>2 - month (M)</li>
    * <li>3 - day of month (d)</li>
    * <li>4 - hour out of 12, from 1-12 (h)</li>
    * <li>5 - hour out of 24, from 0-23 (H)</li>
    * <li>6 - minute (m)</li>
    * <li>7 - second (s)</li>
    * <li>8 - millisecond (S)</li>
    * <li>9 - date of week (E)</li>
    * <li>10 - date of year (D)</li>
    * <li>11 - day of week in month, eg. "4th Thur in Nov" (F)</li>
    * <li>12 - week in year (w)</li>
    * <li>13 - week in month (W)</li>
    * <li>14 - am/pm (a)</li>
    * <li>15 - hour out of 24, from 1-24 (k)</li>
    * <li>16 - hour out of 12, from 0-11 (K)</li>
    * <li>17 - time zone (z)</li>
    * </ul>
    *
    * @return The format patter characters
    */
  public String getLocalPatternChars()
  {
    return localPatternChars;
  }

  /**
   * This method returns the list of strings used for displaying month
   * names (e.g., "January" and "February").  This is a thirteen element
   * string array indexed by <code>Calendar.JANUARY</code> through
   * <code>Calendar.UNDECEMBER</code>.  Note that there are thirteen
   * elements because some calendars have thriteen months.
   *
   * @return The list of month display strings.
   */
  public String[] getMonths ()
  {
    return months;
  }

  /**
   * This method returns the list of strings used for displaying abbreviated
   * month names (e.g., "Jan" and "Feb").  This is a thirteen element
   * <code>String</code> array indexed by <code>Calendar.JANUARY</code>
   * through <code>Calendar.UNDECEMBER</code>.  Note that there are thirteen
   * elements because some calendars have thirteen months.
   *
   * @return The list of abbreviated month display strings.
   */
  public String[] getShortMonths ()
  {
    return shortMonths;
  }

  /**
   * This method returns the list of strings used for displaying abbreviated
   * weekday names (e.g., "Sun" and "Mon").  This is an eight element
   * <code>String</code> array indexed by <code>Calendar.SUNDAY</code>
   * through <code>Calendar.SATURDAY</code>.  Note that the first element
   * of this array is ignored.
   *
   * @return This list of abbreviated weekday display strings.
   */
  public String[] getShortWeekdays ()
  {
    return shortWeekdays;
  }

  /**
   * This method returns the list of strings used for displaying weekday
   * names (e.g., "Sunday" and "Monday").  This is an eight element
   * <code>String</code> array indexed by <code>Calendar.SUNDAY</code>
   * through <code>Calendar.SATURDAY</code>.  Note that the first element
   * of this array is ignored.
   *
   * @return This list of weekday display strings.
   */
  public String[] getWeekdays ()
  {
    return weekdays;
  }

  /**
   * This method returns this list of localized timezone display strings.
   * This is a two dimensional <code>String</code> array where each row in
   * the array contains five values:
   * <P>
   * <ul>
   * <li>0 - The non-localized time zone id string.
   * <li>1 - The long name of the time zone (standard time).
   * <li>2 - The short name of the time zone (standard time).
   * <li>3 - The long name of the time zone (daylight savings time).
   * <li>4 - the short name of the time zone (daylight savings time).
   *
   * @return The list of time zone display strings.
   */
  public String[] [] getZoneStrings ()
  {
    return zoneStrings;
  }

  /**
   * This method sets the list of strings used to display AM/PM values to
   * the specified list.
   * This is a two element <code>String</code> array indexed by
   * <code>Calendar.AM</code> and <code>Calendar.PM</code>
   *
   * @param ampms The new list of AM/PM display strings.
   */
  public void setAmPmStrings (String[] value)
  {
    ampms = value;
  }

  /**
   * This method sets the list of strings used to display time eras to
   * to the specified list.
   * This is a two element <code>String</code>
   * array indexed by <code>Calendar.BC</code> and <code>Calendar.AD</code>.
   *
   * @param eras The new list of era disply strings.
   */
  public void setEras (String[] value)
  {
    eras = value;
  }

  /**
    * This method sets the list of characters used to specific date/time
    * formatting strings.
    * This is an 18 character string that contains the characters
    * that are used in creating the date formatting strings in
    * <code>SimpleDateFormat</code>.   The following are the character
    * positions in the string and which format character they correspond
    * to (the character in parentheses is the default value in the US English
    * locale):
    * <p>
    * <ul>
    * <li>0 - era (G)</li>
    * <li>1 - year (y)</li>
    * <li>2 - month (M)</li>
    * <li>3 - day of month (d)</li>
    * <li>4 - hour out of 12, from 1-12 (h)</li>
    * <li>5 - hour out of 24, from 0-23 (H)</li>
    * <li>6 - minute (m)</li>
    * <li>7 - second (s)</li>
    * <li>8 - millisecond (S)</li>
    * <li>9 - date of week (E)</li>
    * <li>10 - date of year (D)</li>
    * <li>11 - day of week in month, eg. "4th Thur in Nov" (F)</li>
    * <li>12 - week in year (w)</li>
    * <li>13 - week in month (W)</li>
    * <li>14 - am/pm (a)</li>
    * <li>15 - hour out of 24, from 1-24 (k)</li>
    * <li>16 - hour out of 12, from 0-11 (K)</li>
    * <li>17 - time zone (z)</li>
    * </ul>
    *
    * @param localPatternChars The new format patter characters
    */
  public void setLocalPatternChars (String value)
  {
    localPatternChars = value;
  }

  /**
    * This method sets the list of strings used to display month names.
    * This is a thirteen element
    * string array indexed by <code>Calendar.JANUARY</code> through
    * <code>Calendar.UNDECEMBER</code>.  Note that there are thirteen
    * elements because some calendars have thriteen months.
    *
    * @param months The list of month display strings.
    */
  public void setMonths (String[] value)
  {
    months = value;
  }

  /**
   * This method sets the list of strings used to display abbreviated month
   * names.
   * This is a thirteen element
   * <code>String</code> array indexed by <code>Calendar.JANUARY</code>
   * through <code>Calendar.UNDECEMBER</code>.  Note that there are thirteen
   * elements because some calendars have thirteen months.
   *
   * @param shortMonths The new list of abbreviated month display strings.
   */
  public void setShortMonths (String[] value)
  {
    shortMonths = value;
  }

  /**
   * This method sets the list of strings used to display abbreviated
   * weekday names.
   * This is an eight element
   * <code>String</code> array indexed by <code>Calendar.SUNDAY</code>
   * through <code>Calendar.SATURDAY</code>.  Note that the first element
   * of this array is ignored.
   *
   * @param shortWeekdays This list of abbreviated weekday display strings.
   */
  public void setShortWeekdays (String[] value)
  {
    shortWeekdays = value;
  }

  /**
   * This method sets the list of strings used to display weekday names.
   * This is an eight element
   * <code>String</code> array indexed by <code>Calendar.SUNDAY</code>
   * through <code>Calendar.SATURDAY</code>.  Note that the first element
   * of this array is ignored.
   *
   * @param weekdays This list of weekday display strings.
   */
  public void setWeekdays (String[] value)
  {
    weekdays = value;
  }

  /**
   * This method sets the list of display strings for time zones.
   * This is a two dimensional <code>String</code> array where each row in
   * the array contains five values:
   * <P>
   * <ul>
   * <li>0 - The non-localized time zone id string.
   * <li>1 - The long name of the time zone (standard time).
   * <li>2 - The short name of the time zone (standard time).
   * <li>3 - The long name of the time zone (daylight savings time).
   * <li>4 - the short name of the time zone (daylight savings time).
   *
   * @return The list of time zone display strings.
   */
  public void setZoneStrings (String[][] value)
  {
    zoneStrings = value;
  }

  /* Does a "deep" equality test - recurses into arrays. */
  private static boolean equals (Object x, Object y)
  {
    if (x == y)
      return true;
    if (x == null || y == null)
      return false;
    if (! (x instanceof Object[]) || ! (y instanceof Object[]))
      return x.equals(y);
    Object[] xa = (Object[]) x;
    Object[] ya = (Object[]) y;
    if (xa.length != ya.length)
      return false;
    for (int i = xa.length;  --i >= 0; )
      {
	if (! equals(xa[i], ya[i]))
	  return false;
      }
    return true;
  }

  private static int hashCode (Object x)
  {
    if (x == null)
      return 0;
    if (! (x instanceof Object[]))
      return x.hashCode();
    Object[] xa = (Object[]) x;
    int hash = 0;
    for (int i = 0;  i < xa.length;  i++)
      hash = 37 * hashCode(xa[i]);
    return hash;
  }

  /**
   * This method tests a specified object for equality against this object.
   * This will be true if and only if the specified object:
   * <p>
   * <ul>
   * <li> Is not <code>null</code>.
   * <li> Is an instance of <code>DateFormatSymbols</code>.
   * <li> Contains identical formatting symbols to this object.
   * </ul>
   *
   * @param obj The <code>Object</code> to test for equality against.
   *
   * @return <code>true</code> if the specified object is equal to this one,
   * </code>false</code> otherwise.
   */
  public boolean equals (Object obj)
  {
    if (! (obj instanceof DateFormatSymbols))
      return false;
    DateFormatSymbols other = (DateFormatSymbols) obj;
    return (equals(ampms, other.ampms)
	    && equals(eras, other.eras)
	    && equals(localPatternChars, other.localPatternChars)
	    && equals(months, other.months)
	    && equals(shortMonths, other.shortMonths)
	    && equals(shortWeekdays, other.shortWeekdays)
	    && equals(weekdays, other.weekdays)
	    && equals(zoneStrings, other.zoneStrings));
  }

  /**
   * Returns a new copy of this object.
   *
   * @param A copy of this object
   */
  public Object clone ()
  {
    try
      {
        return super.clone ();
      }
    catch (CloneNotSupportedException e)
      {
        return null;
      }
  }

  /**
   * This method returns a hash value for this object.
   *
   * @return A hash value for this object.
   */
  public int hashCode ()
  {
    return (hashCode(ampms)
	    ^ hashCode(eras)
	    ^ hashCode(localPatternChars)
	    ^ hashCode(months)
	    ^ hashCode(shortMonths)
	    ^ hashCode(shortWeekdays)
	    ^ hashCode(weekdays)
	    ^ hashCode(zoneStrings));
  }
}