mirror of git://gcc.gnu.org/git/gcc.git
301 lines
8.7 KiB
Java
301 lines
8.7 KiB
Java
/* java.util.VMTimeZone
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.util;
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import gnu.classpath.Configuration;
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import gnu.classpath.SystemProperties;
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import gnu.java.util.ZoneInfo;
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import java.util.TimeZone;
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import java.io.*;
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/**
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*
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*/
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final class VMTimeZone
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{
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static
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{
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if (Configuration.INIT_LOAD_LIBRARY)
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{
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System.loadLibrary("javautil");
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}
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}
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/**
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* This method returns a time zone id string which is in the form
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* (standard zone name) or (standard zone name)(GMT offset) or
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* (standard zone name)(GMT offset)(daylight time zone name). The
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* GMT offset can be in seconds, or where it is evenly divisible by
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* 3600, then it can be in hours. The offset must be the time to
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* add to the local time to get GMT. If a offset is given and the
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* time zone observes daylight saving then the (daylight time zone
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* name) must also be given (otherwise it is assumed the time zone
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* does not observe any daylight savings).
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* <p>
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* The result of this method is given to the method
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* TimeZone.getDefaultTimeZone(String) which tries to map the time
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* zone id to a known TimeZone. See that method on how the returned
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* String is mapped to a real TimeZone object.
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* <p>
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* The reference implementation which is made for GNU/Posix like
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* systems calls <code>System.getenv("TZ")</code>,
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* <code>readTimeZoneFile("/etc/timezone")</code>,
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* <code>ZoneInfo.readTZFile((String)null, "/etc/localtime")</code>
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* and finally <code>getSystemTimeZoneId()</code> till a supported
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* TimeZone is found through
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* <code>TimeZone.getDefaultTimeZone(String)</code>.
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* If every method fails <code>null</code> is returned (which means
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* the TimeZone code will fall back on GMT as default time zone).
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* <p>
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* Note that this method is called inside a
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* <code>AccessController.doPrivileged()</code> block and runs with
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* the priviliges of the java.util system classes. It will only be
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* called when the default time zone is not yet set, the system
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* property user.timezone isn't set and it is requested for the
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* first time.
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*/
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static TimeZone getDefaultTimeZoneId()
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{
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TimeZone zone = null;
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// See if TZ environment variable is set and accessible.
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String tzid = System.getenv("TZ");
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if (tzid != null && !tzid.equals(""))
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zone = TimeZone.getDefaultTimeZone(tzid);
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// Try to parse /etc/timezone.
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if (zone == null)
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{
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tzid = readTimeZoneFile("/etc/timezone");
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if (tzid != null && !tzid.equals(""))
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zone = TimeZone.getDefaultTimeZone(tzid);
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}
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// Try to parse /etc/localtime
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if (zone == null)
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{
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zone = ZoneInfo.readTZFile((String) null, "/etc/localtime");
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if (zone != null)
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{
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// Try to find a more suitable ID for the /etc/localtime
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// timezone.
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// Sometimes /etc/localtime is a symlink to some
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// /usr/share/zoneinfo/ file.
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String id = null;
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try
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{
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id = new File("/etc/localtime").getCanonicalPath();
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if (id != null)
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{
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String zoneinfo_dir
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= SystemProperties.getProperty("gnu.java.util.zoneinfo.dir");
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if (zoneinfo_dir != null)
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zoneinfo_dir
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= new File(zoneinfo_dir
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+ File.separatorChar).getCanonicalPath();
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if (zoneinfo_dir != null && id.startsWith(zoneinfo_dir))
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{
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int pos = zoneinfo_dir.length();
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while (pos < id.length()
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&& id.charAt(pos) == File.separatorChar)
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pos++;
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if (pos < id.length())
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id = id.substring(pos);
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else
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id = null;
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}
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else
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id = null;
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}
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}
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catch (IOException ioe)
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{
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id = null;
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}
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if (id == null)
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id = readSysconfigClockFile("/etc/sysconfig/clock");
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if (id != null)
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zone.setID(id);
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}
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}
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// Try some system specific way
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if (zone == null)
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{
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tzid = getSystemTimeZoneId();
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if (tzid != null && !tzid.equals(""))
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zone = TimeZone.getDefaultTimeZone(tzid);
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}
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return zone;
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}
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/**
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* Tries to read the time zone name from a file. Only the first
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* consecutive letters, digits, slashes, dashes and underscores are
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* read from the file. If the file cannot be read or an IOException
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* occurs null is returned.
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* <p>
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* The /etc/timezone file is not standard, but a lot of systems have
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* it. If it exist the first line always contains a string
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* describing the timezone of the host of domain. Some systems
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* contain a /etc/TIMEZONE file which is used to set the TZ
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* environment variable (which is checked before /etc/timezone is
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* read).
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*/
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private static String readTimeZoneFile(String file)
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{
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File f = new File(file);
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if (!f.exists())
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return null;
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InputStreamReader isr = null;
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try
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{
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FileInputStream fis = new FileInputStream(f);
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BufferedInputStream bis = new BufferedInputStream(fis);
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isr = new InputStreamReader(bis);
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StringBuffer sb = new StringBuffer();
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int i = isr.read();
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while (i != -1)
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{
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char c = (char) i;
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if (Character.isLetter(c) || Character.isDigit(c)
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|| c == '/' || c == '-' || c == '_')
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{
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sb.append(c);
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i = isr.read();
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}
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else
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break;
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}
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return sb.toString();
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}
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catch (IOException ioe)
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{
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// Parse error, not a proper tzfile.
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return null;
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}
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finally
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{
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try
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{
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if (isr != null)
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isr.close();
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}
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catch (IOException ioe)
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{
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// Error while close, nothing we can do.
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}
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}
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}
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/**
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* Tries to read the time zone name from a file.
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* If the file cannot be read or an IOException occurs null is returned.
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* <p>
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* The /etc/sysconfig/clock file is not standard, but a lot of systems
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* have it. The file is included by shell scripts and the timezone
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* name is defined in ZONE variable.
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* This routine should grok it with or without quotes:
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* ZONE=America/New_York
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* or
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* ZONE="Europe/London"
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*/
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private static String readSysconfigClockFile(String file)
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{
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BufferedReader br = null;
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try
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{
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FileInputStream fis = new FileInputStream(file);
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BufferedInputStream bis = new BufferedInputStream(fis);
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br = new BufferedReader(new InputStreamReader(bis));
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for (String line = br.readLine(); line != null; line = br.readLine())
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{
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line = line.trim();
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if (line.length() < 8 || !line.startsWith("ZONE="))
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continue;
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int posstart = 6;
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int posend;
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if (line.charAt(5) == '"')
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posend = line.indexOf('"', 6);
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else if (line.charAt(5) == '\'')
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posend = line.indexOf('\'', 6);
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else
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{
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posstart = 5;
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posend = line.length();
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}
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if (posend < 0)
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return null;
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return line.substring(posstart, posend);
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}
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return null;
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}
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catch (IOException ioe)
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{
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// Parse error, not a proper tzfile.
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return null;
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}
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finally
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{
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try
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{
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if (br != null)
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br.close();
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}
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catch (IOException ioe)
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{
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// Error while close, nothing we can do.
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}
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}
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}
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/**
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* Tries to get the system time zone id through native code.
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*/
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private static native String getSystemTimeZoneId();
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}
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