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-/* 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();
-}
generated by cgit v1.1 at 2025-03-26 12:32:01 +0000