779 lines
22 KiB
Java
779 lines
22 KiB
Java
/* SimpleDateFormat.java -- A class for parsing/formating simple
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date constructs
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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.Calendar;
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import java.util.Date;
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import java.util.Enumeration;
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import java.util.GregorianCalendar;
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import java.util.Locale;
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import java.util.TimeZone;
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import java.util.SimpleTimeZone;
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import java.util.Vector;
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import java.io.ObjectInputStream;
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import java.io.IOException;
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/**
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* SimpleDateFormat provides convenient methods for parsing and formatting
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* dates using Gregorian calendars (see java.util.GregorianCalendar).
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*/
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public class SimpleDateFormat extends DateFormat
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{
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/** A pair class used by SimpleDateFormat as a compiled representation
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* of a format string.
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*/
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private class FieldSizePair
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{
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public int field;
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public int size;
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/** Constructs a pair with the given field and size values */
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public FieldSizePair(int f, int s) {
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field = f;
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size = s;
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}
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}
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private transient Vector tokens;
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private DateFormatSymbols formatData; // formatData
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private Date defaultCenturyStart;
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private transient int defaultCentury;
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private String pattern;
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private int serialVersionOnStream = 1; // 0 indicates JDK1.1.3 or earlier
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private static final long serialVersionUID = 4774881970558875024L;
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// This string is specified in the JCL. We set it here rather than
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// do a DateFormatSymbols(Locale.US).getLocalPatternChars() since
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// someone could theoretically change those values (though unlikely).
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private static final String standardChars = "GyMdkHmsSEDFwWahKz";
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private void readObject(ObjectInputStream stream)
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throws IOException, ClassNotFoundException
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{
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stream.defaultReadObject();
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if (serialVersionOnStream < 1)
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{
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computeCenturyStart ();
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serialVersionOnStream = 1;
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}
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else
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// Ensure that defaultCentury gets set.
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set2DigitYearStart(defaultCenturyStart);
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// Set up items normally taken care of by the constructor.
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tokens = new Vector();
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compileFormat(pattern);
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}
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private void compileFormat(String pattern)
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{
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// Any alphabetical characters are treated as pattern characters
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// unless enclosed in single quotes.
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char thisChar;
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int pos;
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int field;
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FieldSizePair current = null;
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for (int i=0; i<pattern.length(); i++) {
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thisChar = pattern.charAt(i);
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field = formatData.getLocalPatternChars().indexOf(thisChar);
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if (field == -1) {
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current = null;
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if (Character.isLetter(thisChar)) {
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// Not a valid letter
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tokens.addElement(new FieldSizePair(-1,0));
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} else if (thisChar == '\'') {
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// Quoted text section; skip to next single quote
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pos = pattern.indexOf('\'',i+1);
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if (pos == -1) {
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// This ought to be an exception, but spec does not
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// let us throw one.
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tokens.addElement(new FieldSizePair(-1,0));
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}
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if ((pos+1 < pattern.length()) && (pattern.charAt(pos+1) == '\'')) {
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tokens.addElement(pattern.substring(i+1,pos+1));
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} else {
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tokens.addElement(pattern.substring(i+1,pos));
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}
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i = pos;
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} else {
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// A special character
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tokens.addElement(new Character(thisChar));
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}
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} else {
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// A valid field
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if ((current != null) && (field == current.field)) {
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current.size++;
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} else {
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current = new FieldSizePair(field,1);
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tokens.addElement(current);
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}
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}
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}
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}
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public String toString()
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{
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StringBuffer output = new StringBuffer();
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Enumeration e = tokens.elements();
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while (e.hasMoreElements()) {
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output.append(e.nextElement().toString());
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}
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return output.toString();
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}
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/**
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* Constructs a SimpleDateFormat using the default pattern for
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* the default locale.
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*/
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public SimpleDateFormat()
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{
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/*
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* There does not appear to be a standard API for determining
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* what the default pattern for a locale is, so use package-scope
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* variables in DateFormatSymbols to encapsulate this.
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*/
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super();
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Locale locale = Locale.getDefault();
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calendar = new GregorianCalendar(locale);
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computeCenturyStart();
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tokens = new Vector();
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formatData = new DateFormatSymbols(locale);
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pattern = (formatData.dateFormats[DEFAULT] + ' '
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+ formatData.timeFormats[DEFAULT]);
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compileFormat(pattern);
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numberFormat = NumberFormat.getInstance(locale);
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numberFormat.setGroupingUsed (false);
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}
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/**
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* Creates a date formatter using the specified pattern, with the default
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* DateFormatSymbols for the default locale.
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*/
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public SimpleDateFormat(String pattern)
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{
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this(pattern, Locale.getDefault());
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}
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/**
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* Creates a date formatter using the specified pattern, with the default
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* DateFormatSymbols for the given locale.
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*/
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public SimpleDateFormat(String pattern, Locale locale)
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{
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super();
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calendar = new GregorianCalendar(locale);
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computeCenturyStart();
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tokens = new Vector();
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formatData = new DateFormatSymbols(locale);
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compileFormat(pattern);
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this.pattern = pattern;
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numberFormat = NumberFormat.getInstance(locale);
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numberFormat.setGroupingUsed (false);
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}
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/**
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* Creates a date formatter using the specified pattern. The
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* specified DateFormatSymbols will be used when formatting.
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*/
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public SimpleDateFormat(String pattern, DateFormatSymbols formatData)
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{
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super();
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calendar = new GregorianCalendar();
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computeCenturyStart ();
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tokens = new Vector();
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this.formatData = formatData;
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compileFormat(pattern);
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this.pattern = pattern;
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numberFormat = NumberFormat.getInstance();
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numberFormat.setGroupingUsed (false);
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}
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// What is the difference between localized and unlocalized? The
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// docs don't say.
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/**
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* This method returns a string with the formatting pattern being used
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* by this object. This string is unlocalized.
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*
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* @return The format string.
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*/
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public String toPattern()
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{
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return pattern;
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}
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/**
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* This method returns a string with the formatting pattern being used
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* by this object. This string is localized.
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*
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* @return The format string.
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*/
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public String toLocalizedPattern()
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{
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String localChars = formatData.getLocalPatternChars();
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return applyLocalizedPattern (pattern, standardChars, localChars);
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}
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/**
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* This method sets the formatting pattern that should be used by this
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* object. This string is not localized.
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*
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* @param pattern The new format pattern.
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*/
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public void applyPattern(String pattern)
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{
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tokens = new Vector();
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compileFormat(pattern);
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this.pattern = pattern;
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}
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/**
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* This method sets the formatting pattern that should be used by this
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* object. This string is localized.
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*
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* @param pattern The new format pattern.
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*/
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public void applyLocalizedPattern(String pattern)
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{
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String localChars = formatData.getLocalPatternChars();
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pattern = applyLocalizedPattern (pattern, localChars, standardChars);
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applyPattern(pattern);
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}
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private String applyLocalizedPattern(String pattern,
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String oldChars, String newChars)
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{
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int len = pattern.length();
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StringBuffer buf = new StringBuffer(len);
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boolean quoted = false;
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for (int i = 0; i < len; i++)
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{
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char ch = pattern.charAt(i);
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if (ch == '\'')
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quoted = ! quoted;
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if (! quoted)
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{
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int j = oldChars.indexOf(ch);
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if (j >= 0)
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ch = newChars.charAt(j);
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}
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buf.append(ch);
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}
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return buf.toString();
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}
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/**
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* Returns the start of the century used for two digit years.
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*
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* @return A <code>Date</code> representing the start of the century
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* for two digit years.
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*/
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public Date get2DigitYearStart()
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{
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return defaultCenturyStart;
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}
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/**
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* Sets the start of the century used for two digit years.
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*
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* @param date A <code>Date</code> representing the start of the century for
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* two digit years.
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*/
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public void set2DigitYearStart(Date date)
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{
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defaultCenturyStart = date;
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calendar.clear();
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calendar.setTime(date);
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int year = calendar.get(Calendar.YEAR);
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defaultCentury = year - (year % 100);
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}
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/**
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* This method returns the format symbol information used for parsing
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* and formatting dates.
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*
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* @return The date format symbols.
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*/
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public DateFormatSymbols getDateFormatSymbols()
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{
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return formatData;
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}
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/**
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* This method sets the format symbols information used for parsing
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* and formatting dates.
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*
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* @param formatData The date format symbols.
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*/
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public void setDateFormatSymbols(DateFormatSymbols formatData)
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{
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this.formatData = formatData;
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}
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/**
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* This methods tests whether the specified object is equal to this
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* object. This will be true if and only if the specified 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>SimpleDateFormat</code>.
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* <li>Is equal to this object at the superclass (i.e., <code>DateFormat</code>)
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* level.
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* <li>Has the same formatting pattern.
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* <li>Is using the same formatting symbols.
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* <li>Is using the same century for two digit years.
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* </ul>
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*
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* @param obj The object to compare 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 o)
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{
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if (o == null)
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return false;
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if (!super.equals(o))
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return false;
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if (!(o instanceof SimpleDateFormat))
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return false;
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SimpleDateFormat sdf = (SimpleDateFormat)o;
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if (!toPattern().equals(sdf.toPattern()))
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return false;
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if (!get2DigitYearStart().equals(sdf.get2DigitYearStart()))
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return false;
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if (!getDateFormatSymbols().equals(sdf.getDateFormatSymbols()))
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return false;
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return true;
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}
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/**
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* Formats the date input according to the format string in use,
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* appending to the specified StringBuffer. The input StringBuffer
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* is returned as output for convenience.
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*/
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public StringBuffer format(Date date, StringBuffer buffer, FieldPosition pos)
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{
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String temp;
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calendar.setTime(date);
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// go through vector, filling in fields where applicable, else toString
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Enumeration e = tokens.elements();
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while (e.hasMoreElements()) {
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Object o = e.nextElement();
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if (o instanceof FieldSizePair) {
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FieldSizePair p = (FieldSizePair) o;
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int beginIndex = buffer.length();
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switch (p.field) {
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case ERA_FIELD:
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buffer.append(formatData.eras[calendar.get(Calendar.ERA)]);
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break;
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case YEAR_FIELD:
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temp = String.valueOf(calendar.get(Calendar.YEAR));
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if (p.size < 4)
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buffer.append(temp.substring(temp.length()-2));
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else
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buffer.append(temp);
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break;
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case MONTH_FIELD:
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if (p.size < 3)
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withLeadingZeros(calendar.get(Calendar.MONTH)+1,p.size,buffer);
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else if (p.size < 4)
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buffer.append(formatData.shortMonths[calendar.get(Calendar.MONTH)]);
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else
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buffer.append(formatData.months[calendar.get(Calendar.MONTH)]);
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break;
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case DATE_FIELD:
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withLeadingZeros(calendar.get(Calendar.DATE),p.size,buffer);
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break;
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case HOUR_OF_DAY1_FIELD: // 1-24
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withLeadingZeros(((calendar.get(Calendar.HOUR_OF_DAY)+23)%24)+1,p.size,buffer);
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break;
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case HOUR_OF_DAY0_FIELD: // 0-23
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withLeadingZeros(calendar.get(Calendar.HOUR_OF_DAY),p.size,buffer);
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break;
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case MINUTE_FIELD:
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withLeadingZeros(calendar.get(Calendar.MINUTE),p.size,buffer);
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break;
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case SECOND_FIELD:
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withLeadingZeros(calendar.get(Calendar.SECOND),p.size,buffer);
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break;
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case MILLISECOND_FIELD:
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withLeadingZeros(calendar.get(Calendar.MILLISECOND),p.size,buffer);
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break;
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case DAY_OF_WEEK_FIELD:
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if (p.size < 4)
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buffer.append(formatData.shortWeekdays[calendar.get(Calendar.DAY_OF_WEEK)]);
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else
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buffer.append(formatData.weekdays[calendar.get(Calendar.DAY_OF_WEEK)]);
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break;
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case DAY_OF_YEAR_FIELD:
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withLeadingZeros(calendar.get(Calendar.DAY_OF_YEAR),p.size,buffer);
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break;
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case DAY_OF_WEEK_IN_MONTH_FIELD:
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withLeadingZeros(calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH),p.size,buffer);
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break;
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case WEEK_OF_YEAR_FIELD:
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withLeadingZeros(calendar.get(Calendar.WEEK_OF_YEAR),p.size,buffer);
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break;
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case WEEK_OF_MONTH_FIELD:
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withLeadingZeros(calendar.get(Calendar.WEEK_OF_MONTH),p.size,buffer);
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break;
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case AM_PM_FIELD:
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buffer.append(formatData.ampms[calendar.get(Calendar.AM_PM)]);
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break;
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case HOUR1_FIELD: // 1-12
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withLeadingZeros(((calendar.get(Calendar.HOUR)+11)%12)+1,p.size,buffer);
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break;
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case HOUR0_FIELD: // 0-11
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withLeadingZeros(calendar.get(Calendar.HOUR),p.size,buffer);
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break;
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case TIMEZONE_FIELD:
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TimeZone zone = calendar.getTimeZone();
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boolean isDST = calendar.get(Calendar.DST_OFFSET) != 0;
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// FIXME: XXX: This should be a localized time zone.
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String zoneID = zone.getDisplayName(isDST, p.size > 3 ? TimeZone.LONG : TimeZone.SHORT);
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buffer.append(zoneID);
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break;
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default:
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throw new IllegalArgumentException("Illegal pattern character");
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}
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if (pos != null && p.field == pos.getField())
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{
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pos.setBeginIndex(beginIndex);
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pos.setEndIndex(buffer.length());
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}
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} else {
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buffer.append(o.toString());
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}
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}
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return buffer;
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}
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private void withLeadingZeros(int value, int length, StringBuffer buffer)
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{
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String valStr = String.valueOf(value);
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for (length -= valStr.length(); length > 0; length--)
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buffer.append('0');
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buffer.append(valStr);
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}
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private final boolean expect (String source, ParsePosition pos, char ch)
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{
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int x = pos.getIndex();
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boolean r = x < source.length() && source.charAt(x) == ch;
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if (r)
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pos.setIndex(x + 1);
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else
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pos.setErrorIndex(x);
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return r;
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}
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/**
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* This method parses the specified string into a date.
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*
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* @param dateStr The date string to parse.
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* @param pos The input and output parse position
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*
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* @return The parsed date, or <code>null</code> if the string cannot be
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* parsed.
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*/
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public Date parse (String dateStr, ParsePosition pos)
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{
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int fmt_index = 0;
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int fmt_max = pattern.length();
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calendar.clear();
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boolean saw_timezone = false;
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int quote_start = -1;
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boolean is2DigitYear = false;
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for (; fmt_index < fmt_max; ++fmt_index)
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{
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char ch = pattern.charAt(fmt_index);
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if (ch == '\'')
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{
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int index = pos.getIndex();
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if (fmt_index < fmt_max - 1
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&& pattern.charAt(fmt_index + 1) == '\'')
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{
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if (! expect (dateStr, pos, ch))
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return null;
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++fmt_index;
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}
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|
else
|
|
quote_start = quote_start < 0 ? fmt_index : -1;
|
|
continue;
|
|
}
|
|
|
|
if (quote_start != -1
|
|
|| ((ch < 'a' || ch > 'z')
|
|
&& (ch < 'A' || ch > 'Z')))
|
|
{
|
|
if (! expect (dateStr, pos, ch))
|
|
return null;
|
|
continue;
|
|
}
|
|
|
|
// We've arrived at a potential pattern character in the
|
|
// pattern.
|
|
int first = fmt_index;
|
|
while (++fmt_index < fmt_max && pattern.charAt(fmt_index) == ch)
|
|
;
|
|
int fmt_count = fmt_index - first;
|
|
--fmt_index;
|
|
|
|
// We can handle most fields automatically: most either are
|
|
// numeric or are looked up in a string vector. In some cases
|
|
// we need an offset. When numeric, `offset' is added to the
|
|
// resulting value. When doing a string lookup, offset is the
|
|
// initial index into the string array.
|
|
int calendar_field;
|
|
boolean is_numeric = true;
|
|
String[] match = null;
|
|
int offset = 0;
|
|
boolean maybe2DigitYear = false;
|
|
switch (ch)
|
|
{
|
|
case 'd':
|
|
calendar_field = Calendar.DATE;
|
|
break;
|
|
case 'D':
|
|
calendar_field = Calendar.DAY_OF_YEAR;
|
|
break;
|
|
case 'F':
|
|
calendar_field = Calendar.DAY_OF_WEEK_IN_MONTH;
|
|
break;
|
|
case 'E':
|
|
is_numeric = false;
|
|
offset = 1;
|
|
calendar_field = Calendar.DAY_OF_WEEK;
|
|
match = (fmt_count <= 3
|
|
? formatData.getShortWeekdays()
|
|
: formatData.getWeekdays());
|
|
break;
|
|
case 'w':
|
|
calendar_field = Calendar.WEEK_OF_YEAR;
|
|
break;
|
|
case 'W':
|
|
calendar_field = Calendar.WEEK_OF_MONTH;
|
|
break;
|
|
case 'M':
|
|
calendar_field = Calendar.MONTH;
|
|
if (fmt_count <= 2)
|
|
offset = -1;
|
|
else
|
|
{
|
|
is_numeric = false;
|
|
match = (fmt_count <= 3
|
|
? formatData.getShortMonths()
|
|
: formatData.getMonths());
|
|
}
|
|
break;
|
|
case 'y':
|
|
calendar_field = Calendar.YEAR;
|
|
if (fmt_count <= 2)
|
|
maybe2DigitYear = true;
|
|
break;
|
|
case 'K':
|
|
calendar_field = Calendar.HOUR;
|
|
break;
|
|
case 'h':
|
|
calendar_field = Calendar.HOUR;
|
|
break;
|
|
case 'H':
|
|
calendar_field = Calendar.HOUR_OF_DAY;
|
|
break;
|
|
case 'k':
|
|
calendar_field = Calendar.HOUR_OF_DAY;
|
|
break;
|
|
case 'm':
|
|
calendar_field = Calendar.MINUTE;
|
|
break;
|
|
case 's':
|
|
calendar_field = Calendar.SECOND;
|
|
break;
|
|
case 'S':
|
|
calendar_field = Calendar.MILLISECOND;
|
|
break;
|
|
case 'a':
|
|
is_numeric = false;
|
|
calendar_field = Calendar.AM_PM;
|
|
match = formatData.getAmPmStrings();
|
|
break;
|
|
case 'z':
|
|
// We need a special case for the timezone, because it
|
|
// uses a different data structure than the other cases.
|
|
is_numeric = false;
|
|
calendar_field = Calendar.DST_OFFSET;
|
|
String[][] zoneStrings = formatData.getZoneStrings();
|
|
int zoneCount = zoneStrings.length;
|
|
int index = pos.getIndex();
|
|
boolean found_zone = false;
|
|
for (int j = 0; j < zoneCount; j++)
|
|
{
|
|
String[] strings = zoneStrings[j];
|
|
int k;
|
|
for (k = 1; k < strings.length; ++k)
|
|
{
|
|
if (dateStr.startsWith(strings[k], index))
|
|
break;
|
|
}
|
|
if (k != strings.length)
|
|
{
|
|
found_zone = true;
|
|
saw_timezone = true;
|
|
TimeZone tz = TimeZone.getTimeZone (strings[0]);
|
|
calendar.setTimeZone (tz);
|
|
calendar.set (Calendar.ZONE_OFFSET, tz.getRawOffset ());
|
|
offset = 0;
|
|
if (k > 2 && tz instanceof SimpleTimeZone)
|
|
{
|
|
SimpleTimeZone stz = (SimpleTimeZone) tz;
|
|
offset = stz.getDSTSavings ();
|
|
}
|
|
pos.setIndex(index + strings[k].length());
|
|
break;
|
|
}
|
|
}
|
|
if (! found_zone)
|
|
{
|
|
pos.setErrorIndex(pos.getIndex());
|
|
return null;
|
|
}
|
|
break;
|
|
default:
|
|
pos.setErrorIndex(pos.getIndex());
|
|
return null;
|
|
}
|
|
|
|
// Compute the value we should assign to the field.
|
|
int value;
|
|
int index = -1;
|
|
if (is_numeric)
|
|
{
|
|
numberFormat.setMinimumIntegerDigits(fmt_count);
|
|
if (maybe2DigitYear)
|
|
index = pos.getIndex();
|
|
Number n = numberFormat.parse(dateStr, pos);
|
|
if (pos == null || ! (n instanceof Long))
|
|
return null;
|
|
value = n.intValue() + offset;
|
|
}
|
|
else if (match != null)
|
|
{
|
|
index = pos.getIndex();
|
|
int i;
|
|
for (i = offset; i < match.length; ++i)
|
|
{
|
|
if (dateStr.startsWith(match[i], index))
|
|
break;
|
|
}
|
|
if (i == match.length)
|
|
{
|
|
pos.setErrorIndex(index);
|
|
return null;
|
|
}
|
|
pos.setIndex(index + match[i].length());
|
|
value = i;
|
|
}
|
|
else
|
|
value = offset;
|
|
|
|
if (maybe2DigitYear)
|
|
{
|
|
// Parse into default century if the numeric year string has
|
|
// exactly 2 digits.
|
|
int digit_count = pos.getIndex() - index;
|
|
if (digit_count == 2)
|
|
is2DigitYear = true;
|
|
}
|
|
|
|
// Assign the value and move on.
|
|
calendar.set(calendar_field, value);
|
|
}
|
|
|
|
if (is2DigitYear)
|
|
{
|
|
// Apply the 80-20 heuristic to dermine the full year based on
|
|
// defaultCenturyStart.
|
|
int year = defaultCentury + calendar.get(Calendar.YEAR);
|
|
calendar.set(Calendar.YEAR, year);
|
|
if (calendar.getTime().compareTo(defaultCenturyStart) < 0)
|
|
calendar.set(Calendar.YEAR, year + 100);
|
|
}
|
|
|
|
try
|
|
{
|
|
if (! saw_timezone)
|
|
{
|
|
// Use the real rules to determine whether or not this
|
|
// particular time is in daylight savings.
|
|
calendar.clear (Calendar.DST_OFFSET);
|
|
calendar.clear (Calendar.ZONE_OFFSET);
|
|
}
|
|
return calendar.getTime();
|
|
}
|
|
catch (IllegalArgumentException x)
|
|
{
|
|
pos.setErrorIndex(pos.getIndex());
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// Compute the start of the current century as defined by
|
|
// get2DigitYearStart.
|
|
private void computeCenturyStart()
|
|
{
|
|
int year = calendar.get(Calendar.YEAR);
|
|
calendar.set(Calendar.YEAR, year - 80);
|
|
set2DigitYearStart(calendar.getTime());
|
|
}
|
|
}
|