mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 05:51:04 +00:00
301 lines
8.7 KiB
Java
301 lines
8.7 KiB
Java
/* java.util.VMTimeZone
|
|
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
|
|
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 java.util;
|
|
|
|
import gnu.classpath.Configuration;
|
|
import gnu.classpath.SystemProperties;
|
|
import gnu.java.util.ZoneInfo;
|
|
import java.util.TimeZone;
|
|
|
|
import java.io.*;
|
|
|
|
/**
|
|
*
|
|
*/
|
|
final class VMTimeZone
|
|
{
|
|
static
|
|
{
|
|
if (Configuration.INIT_LOAD_LIBRARY)
|
|
{
|
|
System.loadLibrary("javautil");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This method returns a time zone id string which is in the form
|
|
* (standard zone name) or (standard zone name)(GMT offset) or
|
|
* (standard zone name)(GMT offset)(daylight time zone name). The
|
|
* GMT offset can be in seconds, or where it is evenly divisible by
|
|
* 3600, then it can be in hours. The offset must be the time to
|
|
* add to the local time to get GMT. If a offset is given and the
|
|
* time zone observes daylight saving then the (daylight time zone
|
|
* name) must also be given (otherwise it is assumed the time zone
|
|
* does not observe any daylight savings).
|
|
* <p>
|
|
* The result of this method is given to the method
|
|
* TimeZone.getDefaultTimeZone(String) which tries to map the time
|
|
* zone id to a known TimeZone. See that method on how the returned
|
|
* String is mapped to a real TimeZone object.
|
|
* <p>
|
|
* The reference implementation which is made for GNU/Posix like
|
|
* systems calls <code>System.getenv("TZ")</code>,
|
|
* <code>readTimeZoneFile("/etc/timezone")</code>,
|
|
* <code>ZoneInfo.readTZFile((String)null, "/etc/localtime")</code>
|
|
* and finally <code>getSystemTimeZoneId()</code> till a supported
|
|
* TimeZone is found through
|
|
* <code>TimeZone.getDefaultTimeZone(String)</code>.
|
|
* If every method fails <code>null</code> is returned (which means
|
|
* the TimeZone code will fall back on GMT as default time zone).
|
|
* <p>
|
|
* Note that this method is called inside a
|
|
* <code>AccessController.doPrivileged()</code> block and runs with
|
|
* the priviliges of the java.util system classes. It will only be
|
|
* called when the default time zone is not yet set, the system
|
|
* property user.timezone isn't set and it is requested for the
|
|
* first time.
|
|
*/
|
|
static TimeZone getDefaultTimeZoneId()
|
|
{
|
|
TimeZone zone = null;
|
|
|
|
// See if TZ environment variable is set and accessible.
|
|
String tzid = System.getenv("TZ");
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
|
|
// Try to parse /etc/timezone.
|
|
if (zone == null)
|
|
{
|
|
tzid = readTimeZoneFile("/etc/timezone");
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
}
|
|
|
|
// Try to parse /etc/localtime
|
|
if (zone == null)
|
|
{
|
|
zone = ZoneInfo.readTZFile((String) null, "/etc/localtime");
|
|
if (zone != null)
|
|
{
|
|
// Try to find a more suitable ID for the /etc/localtime
|
|
// timezone.
|
|
// Sometimes /etc/localtime is a symlink to some
|
|
// /usr/share/zoneinfo/ file.
|
|
String id = null;
|
|
try
|
|
{
|
|
id = new File("/etc/localtime").getCanonicalPath();
|
|
if (id != null)
|
|
{
|
|
String zoneinfo_dir
|
|
= SystemProperties.getProperty("gnu.java.util.zoneinfo.dir");
|
|
if (zoneinfo_dir != null)
|
|
zoneinfo_dir
|
|
= new File(zoneinfo_dir
|
|
+ File.separatorChar).getCanonicalPath();
|
|
if (zoneinfo_dir != null && id.startsWith(zoneinfo_dir))
|
|
{
|
|
int pos = zoneinfo_dir.length();
|
|
while (pos < id.length()
|
|
&& id.charAt(pos) == File.separatorChar)
|
|
pos++;
|
|
if (pos < id.length())
|
|
id = id.substring(pos);
|
|
else
|
|
id = null;
|
|
}
|
|
else
|
|
id = null;
|
|
}
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
id = null;
|
|
}
|
|
|
|
if (id == null)
|
|
id = readSysconfigClockFile("/etc/sysconfig/clock");
|
|
|
|
if (id != null)
|
|
zone.setID(id);
|
|
}
|
|
}
|
|
|
|
// Try some system specific way
|
|
if (zone == null)
|
|
{
|
|
tzid = getSystemTimeZoneId();
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
}
|
|
|
|
return zone;
|
|
}
|
|
|
|
/**
|
|
* Tries to read the time zone name from a file. Only the first
|
|
* consecutive letters, digits, slashes, dashes and underscores are
|
|
* read from the file. If the file cannot be read or an IOException
|
|
* occurs null is returned.
|
|
* <p>
|
|
* The /etc/timezone file is not standard, but a lot of systems have
|
|
* it. If it exist the first line always contains a string
|
|
* describing the timezone of the host of domain. Some systems
|
|
* contain a /etc/TIMEZONE file which is used to set the TZ
|
|
* environment variable (which is checked before /etc/timezone is
|
|
* read).
|
|
*/
|
|
private static String readTimeZoneFile(String file)
|
|
{
|
|
File f = new File(file);
|
|
if (!f.exists())
|
|
return null;
|
|
|
|
InputStreamReader isr = null;
|
|
try
|
|
{
|
|
FileInputStream fis = new FileInputStream(f);
|
|
BufferedInputStream bis = new BufferedInputStream(fis);
|
|
isr = new InputStreamReader(bis);
|
|
|
|
StringBuffer sb = new StringBuffer();
|
|
int i = isr.read();
|
|
while (i != -1)
|
|
{
|
|
char c = (char) i;
|
|
if (Character.isLetter(c) || Character.isDigit(c)
|
|
|| c == '/' || c == '-' || c == '_')
|
|
{
|
|
sb.append(c);
|
|
i = isr.read();
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
return sb.toString();
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Parse error, not a proper tzfile.
|
|
return null;
|
|
}
|
|
finally
|
|
{
|
|
try
|
|
{
|
|
if (isr != null)
|
|
isr.close();
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Error while close, nothing we can do.
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Tries to read the time zone name from a file.
|
|
* If the file cannot be read or an IOException occurs null is returned.
|
|
* <p>
|
|
* The /etc/sysconfig/clock file is not standard, but a lot of systems
|
|
* have it. The file is included by shell scripts and the timezone
|
|
* name is defined in ZONE variable.
|
|
* This routine should grok it with or without quotes:
|
|
* ZONE=America/New_York
|
|
* or
|
|
* ZONE="Europe/London"
|
|
*/
|
|
private static String readSysconfigClockFile(String file)
|
|
{
|
|
BufferedReader br = null;
|
|
try
|
|
{
|
|
FileInputStream fis = new FileInputStream(file);
|
|
BufferedInputStream bis = new BufferedInputStream(fis);
|
|
br = new BufferedReader(new InputStreamReader(bis));
|
|
|
|
for (String line = br.readLine(); line != null; line = br.readLine())
|
|
{
|
|
line = line.trim();
|
|
if (line.length() < 8 || !line.startsWith("ZONE="))
|
|
continue;
|
|
int posstart = 6;
|
|
int posend;
|
|
if (line.charAt(5) == '"')
|
|
posend = line.indexOf('"', 6);
|
|
else if (line.charAt(5) == '\'')
|
|
posend = line.indexOf('\'', 6);
|
|
else
|
|
{
|
|
posstart = 5;
|
|
posend = line.length();
|
|
}
|
|
if (posend < 0)
|
|
return null;
|
|
return line.substring(posstart, posend);
|
|
}
|
|
return null;
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Parse error, not a proper tzfile.
|
|
return null;
|
|
}
|
|
finally
|
|
{
|
|
try
|
|
{
|
|
if (br != null)
|
|
br.close();
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Error while close, nothing we can do.
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Tries to get the system time zone id through native code.
|
|
*/
|
|
private static native String getSystemTimeZoneId();
|
|
}
|