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587 lines
17 KiB
Java
587 lines
17 KiB
Java
/* DateFormat.java -- Class for formatting/parsing date/times
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.text;
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import java.util.*;
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/**
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* @author Per Bothner <bothner@cygnus.com>
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* @date October 25, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, plus online
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* API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Mostly complete; search for FIXME to see omissions.
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*/
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public abstract class DateFormat extends Format implements Cloneable
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{
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protected Calendar calendar;
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protected NumberFormat numberFormat;
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// (Values determined using a test program.)
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public static final int FULL = 0;
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public static final int LONG = 1;
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public static final int MEDIUM = 2;
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public static final int SHORT = 3;
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public static final int DEFAULT = MEDIUM;
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/* These constants need to have these exact values. They
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* correspond to index positions within the localPatternChars
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* string for a given locale. For example, the US locale uses
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* the string "GyMdkHmsSEDFwWahKz", where 'G' is the character
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* for era, 'y' for year, and so on down to 'z' for time zone.
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*/
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public static final int ERA_FIELD = 0;
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public static final int YEAR_FIELD = 1;
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public static final int MONTH_FIELD = 2;
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public static final int DATE_FIELD = 3;
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public static final int HOUR_OF_DAY1_FIELD = 4;
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public static final int HOUR_OF_DAY0_FIELD = 5;
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public static final int MINUTE_FIELD = 6;
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public static final int SECOND_FIELD = 7;
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public static final int MILLISECOND_FIELD = 8;
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public static final int DAY_OF_WEEK_FIELD = 9;
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public static final int DAY_OF_YEAR_FIELD = 10;
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public static final int DAY_OF_WEEK_IN_MONTH_FIELD = 11;
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public static final int WEEK_OF_YEAR_FIELD = 12;
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public static final int WEEK_OF_MONTH_FIELD = 13;
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public static final int AM_PM_FIELD = 14;
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public static final int HOUR1_FIELD = 15;
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public static final int HOUR0_FIELD = 16;
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public static final int TIMEZONE_FIELD = 17;
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/**
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* This method initializes a new instance of <code>DateFormat</code>.
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*/
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protected DateFormat ()
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{
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}
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/**
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* This method tests this object for equality against the specified object.
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* The two objects will be considered equal if an only if the specified
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* object:
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* <P>
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* <ul>
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* <li>Is not <code>null</code>.
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* <li>Is an instance of <code>DateFormat</code>.
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* <li>Has the same calendar and numberFormat field values as this object.
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* </ul>
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*
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* @param obj The object to test for equality against.
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*
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* @return <code>true</code> if the specified object is equal to this object,
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* <code>false</code> otherwise.
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*/
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public boolean equals (Object obj)
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{
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if (! (obj instanceof DateFormat))
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return false;
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DateFormat d = (DateFormat) obj;
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return calendar.equals(d.calendar) && numberFormat.equals(d.numberFormat);
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}
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/**
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* This method returns a copy of this object.
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*
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* @return A copy of this object.
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*/
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public Object clone ()
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{
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// We know the superclass just call's Object's generic cloner.
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return super.clone ();
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}
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/**
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* This method formats the specified <code>Object</code> into a date string
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* and appends it to the specified <code>StringBuffer</code>.
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* The specified object must be an instance of <code>Number</code> or
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* <code>Date</code> or an <code>IllegalArgumentException</code> will be
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* thrown.
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*
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* @param obj The <code>Object</code> to format.
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* @param toAppendTo The <code>StringBuffer</code> to append the resultant
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* <code>String</code> to.
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* @param fieldPosition Is updated to the start and end index of the
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* specified field.
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*
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* @return The <code>StringBuffer</code> supplied on input, with the
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* formatted date/time appended.
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*/
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public final StringBuffer format (Object obj,
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StringBuffer buf, FieldPosition pos)
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{
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if (obj instanceof Number)
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obj = new Date(((Number) obj).longValue());
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return format ((Date) obj, buf, pos);
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}
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/**
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* Formats the date argument according to the pattern specified.
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*
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* @param date The formatted date.
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*/
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public final String format (Date date)
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{
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StringBuffer sb = new StringBuffer ();
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format (date, sb, new FieldPosition (MONTH_FIELD));
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return sb.toString();
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}
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/**
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* This method formats a <code>Date</code> into a string and appends it
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* to the specified <code>StringBuffer</code>.
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*
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* @param date The <code>Date</code> value to format.
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* @param toAppendTo The <code>StringBuffer</code> to append the resultant
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* <code>String</code> to.
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* @param fieldPosition Is updated to the start and end index of the
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* specified field.
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*
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* @return The <code>StringBuffer</code> supplied on input, with the
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* formatted date/time appended.
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*/
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public abstract StringBuffer format (Date date,
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StringBuffer buf, FieldPosition pos);
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/**
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* This method returns a list of available locales supported by this
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* class.
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*/
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public static Locale[] getAvailableLocales ()
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{
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// FIXME
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Locale[] l = new Locale[1];
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l[0] = Locale.US;
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return l;
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}
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/**
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* This method returns the <code>Calendar</code> object being used by
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* this object to parse/format datetimes.
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*
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* @return The <code>Calendar</code> being used by this object.
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*
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* @see java.util.Calendar
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*/
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public Calendar getCalendar ()
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{
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return calendar;
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}
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private static final DateFormat computeInstance (int style, Locale loc,
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boolean use_date,
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boolean use_time)
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{
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return computeInstance (style, style, loc, use_date, use_time);
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}
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private static final DateFormat computeInstance (int dateStyle,
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int timeStyle,
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Locale loc,
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boolean use_date,
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boolean use_time)
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{
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ResourceBundle res;
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try
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{
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res = ResourceBundle.getBundle("gnu.java.locale.LocaleInformation",
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loc);
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}
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catch (MissingResourceException x)
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{
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res = null;
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}
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String pattern = null;
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if (use_date)
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{
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String name, def;
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switch (dateStyle)
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{
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case FULL:
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name = "fullDateFormat";
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def = "EEEE MMMM d, yyyy G";
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break;
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case LONG:
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name = "longDateFormat";
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def = "MMMM d, yyyy";
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break;
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case MEDIUM:
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name = "mediumDateFormat";
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def = "d-MMM-yy";
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break;
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case SHORT:
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name = "shortDateFormat";
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def = "M/d/yy";
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break;
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default:
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throw new IllegalArgumentException ();
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}
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try
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{
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pattern = res == null ? def : res.getString(name);
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}
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catch (MissingResourceException x)
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{
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pattern = def;
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}
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}
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if (use_time)
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{
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if (pattern == null)
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pattern = "";
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else
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pattern += " ";
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String name, def;
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switch (timeStyle)
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{
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case FULL:
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name = "fullTimeFormat";
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def = "h:mm:ss;S 'o''clock' a z";
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break;
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case LONG:
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name = "longTimeFormat";
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def = "h:mm:ss a z";
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break;
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case MEDIUM:
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name = "mediumTimeFormat";
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def = "h:mm:ss a";
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break;
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case SHORT:
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name = "shortTimeFormat";
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def = "h:mm a";
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break;
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default:
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throw new IllegalArgumentException ();
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}
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String s;
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try
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{
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s = res == null ? def : res.getString(name);
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}
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catch (MissingResourceException x)
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{
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s = def;
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}
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pattern += s;
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}
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return new SimpleDateFormat (pattern, loc);
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}
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/**
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* This method returns an instance of <code>DateFormat</code> that will
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* format using the default formatting style for dates.
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*
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* @return A new <code>DateFormat</code> instance.
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*/
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public static final DateFormat getDateInstance ()
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{
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return getDateInstance (DEFAULT, Locale.getDefault());
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}
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/**
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* This method returns an instance of <code>DateFormat</code> that will
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* format using the specified formatting style for dates.
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*
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* @param style The type of formatting to perform.
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*
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* @return A new <code>DateFormat</code> instance.
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*/
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public static final DateFormat getDateInstance (int style)
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{
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return getDateInstance (style, Locale.getDefault());
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}
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/**
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* This method returns an instance of <code>DateFormat</code> that will
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* format using the specified formatting style for dates. The specified
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* localed will be used in place of the default.
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*
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* @param style The type of formatting to perform.
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* @param aLocale The desired locale.
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*
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* @return A new <code>DateFormat</code> instance.
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*/
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public static final DateFormat getDateInstance (int style, Locale loc)
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{
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return computeInstance (style, loc, true, false);
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}
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/**
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* This method returns a new instance of <code>DateFormat</code> that
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* formats both dates and times using the <code>SHORT</code> style.
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*
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* @return A new <code>DateFormat</code>instance.
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*/
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public static final DateFormat getDateTimeInstance ()
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{
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return getDateTimeInstance (DEFAULT, DEFAULT, Locale.getDefault());
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}
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/**
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* This method returns a new instance of <code>DateFormat</code> that
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* formats both dates and times using the <code>DEFAULT</code> style.
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*
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* @return A new <code>DateFormat</code>instance.
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*/
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public static final DateFormat getDateTimeInstance (int dateStyle,
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int timeStyle)
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{
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return getDateTimeInstance (dateStyle, timeStyle, Locale.getDefault());
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}
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/**
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* This method returns a new instance of <code>DateFormat</code> that
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* formats both dates and times using the specified styles.
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*
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* @param dateStyle The desired style for date formatting.
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* @param timeStyle The desired style for time formatting
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*
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* @return A new <code>DateFormat</code>instance.
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*/
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public static final DateFormat getDateTimeInstance (int dateStyle,
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int timeStyle,
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Locale loc)
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{
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return computeInstance (dateStyle, timeStyle, loc, true, true);
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}
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/**
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* This method returns a new instance of <code>DateFormat</code> that
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* formats both dates and times using the <code>SHORT</code> style.
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*
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* @return A new <code>DateFormat</code>instance.
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*/
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public static final DateFormat getInstance ()
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{
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// JCL book says SHORT.
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return getDateTimeInstance (SHORT, SHORT, Locale.getDefault());
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}
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/**
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* This method returns the <code>NumberFormat</code> object being used
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* by this object to parse/format time values.
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*
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* @return The <code>NumberFormat</code> in use by this object.
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*/
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public NumberFormat getNumberFormat ()
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{
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return numberFormat;
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}
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/**
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* This method returns an instance of <code>DateFormat</code> that will
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* format using the default formatting style for times.
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*
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* @return A new <code>DateFormat</code> instance.
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*/
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public static final DateFormat getTimeInstance ()
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{
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return getTimeInstance (DEFAULT, Locale.getDefault());
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}
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/**
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* This method returns an instance of <code>DateFormat</code> that will
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* format using the specified formatting style for times.
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*
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* @param style The type of formatting to perform.
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*
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* @return A new <code>DateFormat</code> instance.
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*/
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public static final DateFormat getTimeInstance (int style)
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{
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return getTimeInstance (style, Locale.getDefault());
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}
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/**
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* This method returns an instance of <code>DateFormat</code> that will
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* format using the specified formatting style for times. The specified
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* localed will be used in place of the default.
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*
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* @param style The type of formatting to perform.
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* @param aLocale The desired locale.
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*
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* @return A new <code>DateFormat</code> instance.
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*/
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public static final DateFormat getTimeInstance (int style, Locale loc)
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{
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return computeInstance (style, loc, false, true);
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}
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/**
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* This method returns the <code>TimeZone</code> object being used by
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* this instance.
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*
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* @return The time zone in use.
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*/
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public TimeZone getTimeZone ()
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{
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return calendar.getTimeZone();
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}
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/**
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* This method returns a hash value for this object.
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*
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* @return A hash value for this object.
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*/
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public int hashCode ()
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{
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int hash = calendar.hashCode();
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if (numberFormat != null)
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hash ^= numberFormat.hashCode();
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return hash;
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}
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/**
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* This method indicates whether or not the parsing of date and time
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* values should be done in a lenient value.
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*
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* @return <code>true</code> if date/time parsing is lenient,
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* <code>false</code> otherwise.
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*/
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public boolean isLenient ()
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{
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return calendar.isLenient();
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}
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/**
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* This method parses the specified date/time string.
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*
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* @return The resultant date.
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*
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* @exception ParseException If the specified string cannot be parsed.
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*/
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public Date parse (String source) throws ParseException
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{
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ParsePosition pos = new ParsePosition(0);
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Date result = parse (source, pos);
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if (result == null)
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{
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int index = pos.getErrorIndex();
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if (index < 0)
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index = pos.getIndex();
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throw new ParseException("invalid Date syntax", index);
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}
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return result;
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}
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/**
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* This method parses the specified <code>String</code> into a
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* <code>Date</code>. The <code>pos</code> argument contains the
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* starting parse position on method entry and the ending parse
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* position on method exit.
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*
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* @param text The string to parse.
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* @param pos The starting parse position in entry, the ending parse
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* position on exit.
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*
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* @return The parsed date, or <code>null</code> if the string cannot
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* be parsed.
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*/
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public abstract Date parse (String source, ParsePosition pos);
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/**
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* This method is identical to <code>parse(String, ParsePosition)</code>,
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* but returns its result as an <code>Object</code> instead of a
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* <code>Date</code>.
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*
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* @param source The string to parse.
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* @param pos The starting parse position in entry, the ending parse
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* position on exit.
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*
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* @return The parsed date, or <code>null</code> if the string cannot
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* be parsed.
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*/
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public Object parseObject (String source, ParsePosition pos)
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{
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return parse(source, pos);
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}
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/**
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* This method specified the <code>Calendar</code> that should be used
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* by this object to parse/format datetimes.
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*
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* @param The new <code>Calendar</code> for this object.
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*
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* @see java.util.Calendar
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*/
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public void setCalendar (Calendar calendar)
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{
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this.calendar = calendar;
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}
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/**
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* This method specifies whether or not this object should be lenient in
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* the syntax it accepts while parsing date/time values.
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*
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* @param lenient <code>true</code> if parsing should be lenient,
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* <code>false</code> otherwise.
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*/
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public void setLenient (boolean lenient)
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{
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calendar.setLenient(lenient);
|
|
}
|
|
|
|
/**
|
|
* This method specifies the <code>NumberFormat</code> object that should
|
|
* be used by this object to parse/format times.
|
|
*
|
|
* @param The <code>NumberFormat</code> in use by this object.
|
|
*/
|
|
public void setNumberFormat (NumberFormat numberFormat)
|
|
{
|
|
this.numberFormat = numberFormat;
|
|
}
|
|
|
|
/**
|
|
* This method sets the time zone that should be used by this object.
|
|
*
|
|
* @param The new time zone.
|
|
*/
|
|
public void setTimeZone (TimeZone timeZone)
|
|
{
|
|
calendar.setTimeZone(timeZone);
|
|
}
|
|
}
|