441 lines
14 KiB
Java
441 lines
14 KiB
Java
/* HTTPDateFormat.java --
|
|
Copyright (C) 2004 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
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package gnu.java.net.protocol.http;
|
|
|
|
import java.text.DateFormat;
|
|
import java.text.DecimalFormat;
|
|
import java.text.FieldPosition;
|
|
import java.text.NumberFormat;
|
|
import java.text.ParsePosition;
|
|
import java.util.Calendar;
|
|
import java.util.Date;
|
|
import java.util.GregorianCalendar;
|
|
import java.util.TimeZone;
|
|
|
|
/**
|
|
* HTTP date formatter and parser.
|
|
* Formats dates according to RFC 822 (updated by RFC 1123).
|
|
* Parses dates according to the above, <i>or</i> RFC 1036, <i>or</i> the
|
|
* ANSI C <code>asctime()</code> format.
|
|
*
|
|
* @author Chris Burdess (dog@gnu.org)
|
|
*/
|
|
public class HTTPDateFormat
|
|
extends DateFormat
|
|
{
|
|
|
|
static final String[] DAYS_OF_WEEK = {
|
|
null, "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
|
|
};
|
|
|
|
static final String[] MONTHS = {
|
|
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
|
|
};
|
|
|
|
public HTTPDateFormat()
|
|
{
|
|
calendar = new GregorianCalendar(TimeZone.getTimeZone ("GMT"));
|
|
numberFormat = new DecimalFormat();
|
|
}
|
|
|
|
/**
|
|
* Appends the textual value for the specified field to the given string
|
|
* buffer. This method should be avoided, use <code>format(Date)</code>
|
|
* instead.
|
|
* @param date the Date object
|
|
* @param buf the buffer to append to
|
|
* @param field the current field position
|
|
* @return the modified buffer
|
|
*/
|
|
public StringBuffer format(Date date, StringBuffer buf,
|
|
FieldPosition field)
|
|
{
|
|
calendar.clear();
|
|
calendar.setTime(date);
|
|
buf.setLength(0);
|
|
|
|
// Day of week
|
|
buf.append(DAYS_OF_WEEK[calendar.get(Calendar.DAY_OF_WEEK)]);
|
|
buf.append(',');
|
|
buf.append(' ');
|
|
|
|
// Day of month
|
|
int day = calendar.get(Calendar.DAY_OF_MONTH);
|
|
buf.append(Character.forDigit(day / 10, 10));
|
|
buf.append(Character.forDigit(day % 10, 10));
|
|
buf.append(' ');
|
|
|
|
// Month
|
|
buf.append(MONTHS[calendar.get(Calendar.MONTH)]);
|
|
buf.append(' ');
|
|
|
|
// Year
|
|
int year = calendar.get(Calendar.YEAR);
|
|
if (year < 1000)
|
|
{
|
|
buf.append('0');
|
|
if (year < 100)
|
|
{
|
|
buf.append('0');
|
|
if (year < 10)
|
|
{
|
|
buf.append('0');
|
|
}
|
|
}
|
|
}
|
|
buf.append(Integer.toString(year));
|
|
buf.append(' ');
|
|
|
|
// Hour
|
|
int hour = calendar.get(Calendar.HOUR_OF_DAY);
|
|
buf.append(Character.forDigit(hour / 10, 10));
|
|
buf.append(Character.forDigit(hour % 10, 10));
|
|
buf.append(':');
|
|
|
|
// Minute
|
|
int minute = calendar.get(Calendar.MINUTE);
|
|
buf.append(Character.forDigit(minute / 10, 10));
|
|
buf.append(Character.forDigit(minute % 10, 10));
|
|
buf.append(':');
|
|
|
|
// Second
|
|
int second = calendar.get(Calendar.SECOND);
|
|
buf.append(Character.forDigit(second / 10, 10));
|
|
buf.append(Character.forDigit(second % 10, 10));
|
|
buf.append(' ');
|
|
|
|
// Timezone
|
|
// Get time offset in minutes
|
|
int zoneOffset =(calendar.get(Calendar.ZONE_OFFSET) +
|
|
calendar.get(Calendar.DST_OFFSET)) / 60000;
|
|
|
|
// Apply + or - appropriately
|
|
if (zoneOffset < 0)
|
|
{
|
|
zoneOffset = -zoneOffset;
|
|
buf.append('-');
|
|
}
|
|
else
|
|
{
|
|
buf.append('+');
|
|
}
|
|
|
|
// Set the 2 2-char fields as specified above
|
|
int tzhours = zoneOffset / 60;
|
|
buf.append(Character.forDigit(tzhours / 10, 10));
|
|
buf.append(Character.forDigit(tzhours % 10, 10));
|
|
int tzminutes = zoneOffset % 60;
|
|
buf.append(Character.forDigit(tzminutes / 10, 10));
|
|
buf.append(Character.forDigit(tzminutes % 10, 10));
|
|
|
|
field.setBeginIndex(0);
|
|
field.setEndIndex(buf.length());
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* Parses the given date in the current TimeZone.
|
|
* @param text the formatted date to be parsed
|
|
* @param pos the current parse position
|
|
*/
|
|
public Date parse(String text, ParsePosition pos)
|
|
{
|
|
int date, month, year, hour, minute, second;
|
|
String monthText;
|
|
int start = 0, end = -1;
|
|
int len = text.length();
|
|
calendar.clear();
|
|
pos.setIndex(start);
|
|
try
|
|
{
|
|
// Advance to date
|
|
if (Character.isLetter(text.charAt(start)))
|
|
{
|
|
start = skipNonWhitespace(text, start);
|
|
}
|
|
// Determine mode
|
|
switch(start)
|
|
{
|
|
case 3:
|
|
// asctime
|
|
start = skipWhitespace(text, start);
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
monthText = text.substring(start, end);
|
|
month = -1;
|
|
for (int i = 0; i < 12; i++)
|
|
{
|
|
if (MONTHS[i].equals(monthText))
|
|
{
|
|
month = i;
|
|
break;
|
|
}
|
|
}
|
|
if (month == -1)
|
|
{
|
|
pos.setErrorIndex(end);
|
|
return null;
|
|
}
|
|
// Advance to date
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
date = Integer.parseInt(text.substring(start, end));
|
|
// Advance to hour
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, ':');
|
|
hour = Integer.parseInt(text.substring(start, end));
|
|
// Advance to minute
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, ':');
|
|
minute = Integer.parseInt(text.substring(start, end));
|
|
// Advance to second
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
second = Integer.parseInt(text.substring(start, end));
|
|
// Advance to year
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
year = Integer.parseInt(text.substring(start, end));
|
|
break;
|
|
case 0:
|
|
case 4:
|
|
// rfc822
|
|
start = skipWhitespace(text, start);
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
date = Integer.parseInt(text.substring(start, end));
|
|
// Advance to month
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
monthText = text.substring(start, end);
|
|
month = -1;
|
|
for (int i = 0; i < 12; i++)
|
|
{
|
|
if (MONTHS[i].equals(monthText))
|
|
{
|
|
month = i;
|
|
break;
|
|
}
|
|
}
|
|
if (month == -1)
|
|
{
|
|
pos.setErrorIndex(end);
|
|
return null;
|
|
}
|
|
// Advance to year
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
year = Integer.parseInt(text.substring(start, end));
|
|
// Advance to hour
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, ':');
|
|
hour = Integer.parseInt(text.substring(start, end));
|
|
// Advance to minute
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, ':');
|
|
minute = Integer.parseInt(text.substring(start, end));
|
|
// Advance to second
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = start + 1;
|
|
while (end < len && !Character.isWhitespace(text.charAt(end)))
|
|
{
|
|
end++;
|
|
}
|
|
second = Integer.parseInt(text.substring(start, end));
|
|
break;
|
|
default:
|
|
// rfc850(obsolete)
|
|
start = skipWhitespace(text, start);
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, '-');
|
|
date = Integer.parseInt(text.substring(start, end));
|
|
// Advance to month
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, '-');
|
|
monthText = text.substring(start, end);
|
|
month = -1;
|
|
for (int i = 0; i < 12; i++)
|
|
{
|
|
if (MONTHS[i].equals(monthText))
|
|
{
|
|
month = i;
|
|
break;
|
|
}
|
|
}
|
|
if (month == -1)
|
|
{
|
|
pos.setErrorIndex(end);
|
|
return null;
|
|
}
|
|
// Advance to year
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = skipNonWhitespace(text, start + 1);
|
|
year = 1900 + Integer.parseInt(text.substring(start, end));
|
|
// Advance to hour
|
|
start = skipWhitespace(text, end + 1);
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, ':');
|
|
hour = Integer.parseInt(text.substring(start, end));
|
|
// Advance to minute
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = skipTo(text, start + 1, ':');
|
|
minute = Integer.parseInt(text.substring(start, end));
|
|
// Advance to second
|
|
start = end + 1;
|
|
pos.setIndex(start);
|
|
end = start + 1;
|
|
while (end < len && !Character.isWhitespace(text.charAt(end)))
|
|
{
|
|
end++;
|
|
}
|
|
second = Integer.parseInt(text.substring(start, end));
|
|
}
|
|
|
|
calendar.set(Calendar.YEAR, year);
|
|
calendar.set(Calendar.MONTH, month);
|
|
calendar.set(Calendar.DAY_OF_MONTH, date);
|
|
calendar.set(Calendar.HOUR, hour);
|
|
calendar.set(Calendar.MINUTE, minute);
|
|
calendar.set(Calendar.SECOND, second);
|
|
|
|
if (end != len)
|
|
{
|
|
// Timezone
|
|
start = skipWhitespace(text, end + 1);
|
|
end = start + 1;
|
|
while (end < len && !Character.isWhitespace(text.charAt(end)))
|
|
{
|
|
end++;
|
|
}
|
|
char pm = text.charAt(start);
|
|
if (Character.isLetter(pm))
|
|
{
|
|
TimeZone tz =
|
|
TimeZone.getTimeZone(text.substring(start, end));
|
|
calendar.set(Calendar.ZONE_OFFSET, tz.getRawOffset());
|
|
}
|
|
else
|
|
{
|
|
int zoneOffset = 0;
|
|
zoneOffset += 600 * Character.digit(text.charAt(++start), 10);
|
|
zoneOffset += 60 * Character.digit(text.charAt(++start), 10);
|
|
zoneOffset += 10 * Character.digit(text.charAt(++start), 10);
|
|
zoneOffset += Character.digit(text.charAt(++start), 10);
|
|
zoneOffset *= 60000; // minutes -> ms
|
|
if ('-' == pm)
|
|
{
|
|
zoneOffset = -zoneOffset;
|
|
}
|
|
calendar.set(Calendar.ZONE_OFFSET, zoneOffset);
|
|
}
|
|
}
|
|
pos.setIndex(end);
|
|
|
|
return calendar.getTime();
|
|
}
|
|
catch (NumberFormatException e)
|
|
{
|
|
pos.setErrorIndex(Math.max(start, end));
|
|
}
|
|
catch (StringIndexOutOfBoundsException e)
|
|
{
|
|
pos.setErrorIndex(Math.max(start, end));
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private int skipWhitespace(String text, int pos)
|
|
{
|
|
while(Character.isWhitespace(text.charAt(pos)))
|
|
{
|
|
pos++;
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
private int skipNonWhitespace(String text, int pos)
|
|
{
|
|
while(!Character.isWhitespace(text.charAt(pos)))
|
|
{
|
|
pos++;
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
private int skipTo(String text, int pos, char c)
|
|
{
|
|
while(text.charAt(pos) != c)
|
|
{
|
|
pos++;
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
/**
|
|
* Don't allow setting the calendar.
|
|
*/
|
|
public void setCalendar(Calendar newCalendar)
|
|
{
|
|
throw new UnsupportedOperationException();
|
|
}
|
|
|
|
/**
|
|
* Don't allow setting the NumberFormat.
|
|
*/
|
|
public void setNumberFormat(NumberFormat newNumberFormat)
|
|
{
|
|
throw new UnsupportedOperationException();
|
|
}
|
|
|
|
}
|
|
|