mirror of git://gcc.gnu.org/git/gcc.git
1079 lines
38 KiB
Java
1079 lines
38 KiB
Java
/* java.util.SimpleTimeZone
|
|
Copyright (C) 1998, 1999, 2000, 2003, 2004, 2005 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;
|
|
|
|
|
|
/**
|
|
* This class represents a simple time zone offset and handles
|
|
* daylight savings. It can only handle one daylight savings rule, so
|
|
* it can't represent historical changes.
|
|
*
|
|
* This object is tightly bound to the Gregorian calendar. It assumes
|
|
* a regular seven days week, and the month lengths are that of the
|
|
* Gregorian Calendar. It can only handle daylight savings for years
|
|
* lying in the AD era.
|
|
*
|
|
* @see Calendar
|
|
* @see GregorianCalender
|
|
* @author Jochen Hoenicke
|
|
*/
|
|
public class SimpleTimeZone extends TimeZone
|
|
{
|
|
/**
|
|
* The raw time zone offset in milliseconds to GMT, ignoring
|
|
* daylight savings.
|
|
* @serial
|
|
*/
|
|
private int rawOffset;
|
|
|
|
/**
|
|
* True, if this timezone uses daylight savings, false otherwise.
|
|
* @serial
|
|
*/
|
|
private boolean useDaylight;
|
|
|
|
/**
|
|
* The daylight savings offset. This is a positive offset in
|
|
* milliseconds with respect to standard time. Typically this
|
|
* is one hour, but for some time zones this may be half an hour.
|
|
* @serial
|
|
* @since JDK1.1.4
|
|
*/
|
|
private int dstSavings = 60 * 60 * 1000;
|
|
|
|
/**
|
|
* The first year, in which daylight savings rules applies.
|
|
* @serial
|
|
*/
|
|
private int startYear;
|
|
private static final int DOM_MODE = 1;
|
|
private static final int DOW_IN_MONTH_MODE = 2;
|
|
private static final int DOW_GE_DOM_MODE = 3;
|
|
private static final int DOW_LE_DOM_MODE = 4;
|
|
|
|
/**
|
|
* The mode of the start rule. This takes one of the following values:
|
|
* <dl>
|
|
* <dt>DOM_MODE (1)</dt>
|
|
* <dd> startDay contains the day in month of the start date,
|
|
* startDayOfWeek is unused. </dd>
|
|
* <dt>DOW_IN_MONTH_MODE (2)</dt>
|
|
* <dd> The startDay gives the day of week in month, and
|
|
* startDayOfWeek the day of week. For example startDay=2 and
|
|
* startDayOfWeek=Calender.SUNDAY specifies that the change is on
|
|
* the second sunday in that month. You must make sure, that this
|
|
* day always exists (ie. don't specify the 5th sunday).
|
|
* </dd>
|
|
* <dt>DOW_GE_DOM_MODE (3)</dt>
|
|
* <dd> The start is on the first startDayOfWeek on or after
|
|
* startDay. For example startDay=13 and
|
|
* startDayOfWeek=Calendar.FRIDAY specifies that the daylight
|
|
* savings start on the first FRIDAY on or after the 13th of that
|
|
* Month. Make sure that the change is always in the given month, or
|
|
* the result is undefined.
|
|
* </dd>
|
|
* <dt>DOW_LE_DOM_MONTH (4)</dt>
|
|
* <dd> The start is on the first startDayOfWeek on or before the
|
|
* startDay. Make sure that the change is always in the given
|
|
* month, or the result is undefined.
|
|
</dd>
|
|
* </dl>
|
|
* @serial */
|
|
private int startMode;
|
|
|
|
/**
|
|
* The month in which daylight savings start. This is one of the
|
|
* constants Calendar.JANUARY, ..., Calendar.DECEMBER.
|
|
* @serial
|
|
*/
|
|
private int startMonth;
|
|
|
|
/**
|
|
* This variable can have different meanings. See startMode for details
|
|
* @see #startMode;
|
|
* @serial
|
|
*/
|
|
private int startDay;
|
|
|
|
/**
|
|
* This variable specifies the day of week the change takes place. If
|
|
* startMode == DOM_MODE, this is undefined.
|
|
* @serial
|
|
* @see #startMode;
|
|
*/
|
|
private int startDayOfWeek;
|
|
|
|
/**
|
|
* This variable specifies the time of change to daylight savings.
|
|
* This time is given in milliseconds after midnight local
|
|
* standard time.
|
|
* @serial
|
|
*/
|
|
private int startTime;
|
|
|
|
/**
|
|
* This variable specifies the mode that startTime is specified in. By
|
|
* default it is WALL_TIME, but can also be STANDARD_TIME or UTC_TIME. For
|
|
* startTime, STANDARD_TIME and WALL_TIME are equivalent.
|
|
* @serial
|
|
*/
|
|
private int startTimeMode = WALL_TIME;
|
|
|
|
/**
|
|
* The month in which daylight savings ends. This is one of the
|
|
* constants Calendar.JANUARY, ..., Calendar.DECEMBER.
|
|
* @serial
|
|
*/
|
|
private int endMonth;
|
|
|
|
/**
|
|
* This variable gives the mode for the end of daylight savings rule.
|
|
* It can take the same values as startMode.
|
|
* @serial
|
|
* @see #startMode
|
|
*/
|
|
private int endMode;
|
|
|
|
/**
|
|
* This variable can have different meanings. See startMode for details
|
|
* @serial
|
|
* @see #startMode;
|
|
*/
|
|
private int endDay;
|
|
|
|
/**
|
|
* This variable specifies the day of week the change takes place. If
|
|
* endMode == DOM_MODE, this is undefined.
|
|
* @serial
|
|
* @see #startMode;
|
|
*/
|
|
private int endDayOfWeek;
|
|
|
|
/**
|
|
* This variable specifies the time of change back to standard time.
|
|
* This time is given in milliseconds after midnight local
|
|
* standard time.
|
|
* @serial
|
|
*/
|
|
private int endTime;
|
|
|
|
/**
|
|
* This variable specifies the mode that endTime is specified in. By
|
|
* default it is WALL_TIME, but can also be STANDARD_TIME or UTC_TIME.
|
|
* @serial
|
|
*/
|
|
private int endTimeMode = WALL_TIME;
|
|
|
|
/**
|
|
* This variable points to a deprecated array from JDK 1.1. It is
|
|
* ignored in JDK 1.2 but streamed out for compatibility with JDK 1.1.
|
|
* The array contains the lengths of the months in the year and is
|
|
* assigned from a private static final field to avoid allocating
|
|
* the array for every instance of the object.
|
|
* Note that static final fields are not serialized.
|
|
* @serial
|
|
*/
|
|
private byte[] monthLength = monthArr;
|
|
private static final byte[] monthArr =
|
|
{
|
|
31, 28, 31, 30, 31, 30, 31, 31, 30,
|
|
31, 30, 31
|
|
};
|
|
|
|
/**
|
|
* The version of the serialized data on the stream.
|
|
* <dl>
|
|
* <dt>0 or not present on stream</dt>
|
|
* <dd> JDK 1.1.3 or earlier, only provides this fields:
|
|
* rawOffset, startDay, startDayOfWeek, startMonth, startTime,
|
|
* startYear, endDay, endDayOfWeek, endMonth, endTime
|
|
* </dd>
|
|
* <dd> JDK 1.1.4 or later. This includes three new fields, namely
|
|
* startMode, endMode and dstSavings. And there is a optional section
|
|
* as described in writeObject.
|
|
* </dd>
|
|
* </dl>
|
|
*
|
|
* XXX - JDK 1.2 Beta 4 docu states 1.1.4, but my 1.1.5 has the old
|
|
* version.
|
|
*
|
|
* When streaming out this class it is always written in the latest
|
|
* version.
|
|
* @serial
|
|
* @since JDK1.1.4
|
|
*/
|
|
private int serialVersionOnStream = 2;
|
|
private static final long serialVersionUID = -403250971215465050L;
|
|
|
|
/**
|
|
* Constant to indicate that start and end times are specified in standard
|
|
* time, without adjusting for daylight savings.
|
|
*/
|
|
public static final int STANDARD_TIME = 1;
|
|
|
|
/**
|
|
* Constant to indicate that start and end times are specified in wall
|
|
* time, adjusting for daylight savings. This is the default.
|
|
*/
|
|
public static final int WALL_TIME = 0;
|
|
|
|
/**
|
|
* Constant to indicate that start and end times are specified in UTC.
|
|
*/
|
|
public static final int UTC_TIME = 2;
|
|
|
|
/**
|
|
* Create a <code>SimpleTimeZone</code> with the given time offset
|
|
* from GMT and without daylight savings.
|
|
* @param rawOffset the time offset from GMT in milliseconds.
|
|
* @param id The identifier of this time zone.
|
|
*/
|
|
public SimpleTimeZone(int rawOffset, String id)
|
|
{
|
|
this.rawOffset = rawOffset;
|
|
setID(id);
|
|
useDaylight = false;
|
|
startYear = 0;
|
|
}
|
|
|
|
/**
|
|
* Create a <code>SimpleTimeZone</code> with the given time offset
|
|
* from GMT and with daylight savings. The start/end parameters
|
|
* can have different meaning (replace WEEKDAY with a real day of
|
|
* week). Only the first two meanings were supported by earlier
|
|
* versions of jdk.
|
|
*
|
|
* <dl>
|
|
* <dt><code>day > 0, dayOfWeek = Calendar.WEEKDAY</code></dt>
|
|
* <dd>The start/end of daylight savings is on the <code>day</code>-th
|
|
* <code>WEEKDAY</code> in the given month. </dd>
|
|
* <dt><code>day < 0, dayOfWeek = Calendar.WEEKDAY</code></dt>
|
|
* <dd>The start/end of daylight savings is on the <code>-day</code>-th
|
|
* <code>WEEKDAY</code> counted from the <i>end</i> of the month. </dd>
|
|
* <dt><code>day > 0, dayOfWeek = 0</code></dt>
|
|
* <dd>The start/end of daylight is on the <code>day</code>-th day of
|
|
* the month. </dd>
|
|
* <dt><code>day > 0, dayOfWeek = -Calendar.WEEKDAY</code></dt>
|
|
* <dd>The start/end of daylight is on the first WEEKDAY on or after
|
|
* the <code>day</code>-th day of the month. You must make sure that
|
|
* this day lies in the same month. </dd>
|
|
* <dt><code>day < 0, dayOfWeek = -Calendar.WEEKDAY</code></dt>
|
|
* <dd>The start/end of daylight is on the first WEEKDAY on or
|
|
* <i>before</i> the <code>-day</code>-th day of the month. You
|
|
* must make sure that this day lies in the same month. </dd>
|
|
* </dl>
|
|
*
|
|
* If you give a non existing month, a day that is zero, or too big,
|
|
* or a dayOfWeek that is too big, the result is undefined.
|
|
*
|
|
* The start rule must have a different month than the end rule.
|
|
* This restriction shouldn't hurt for all possible time zones.
|
|
*
|
|
* @param rawOffset The time offset from GMT in milliseconds.
|
|
* @param id The identifier of this time zone.
|
|
* @param startMonth The start month of daylight savings; use the
|
|
* constants in Calendar.
|
|
* @param startday A day in month or a day of week number, as
|
|
* described above.
|
|
* @param startDayOfWeek The start rule day of week; see above.
|
|
* @param startTime A time in millis in standard time.
|
|
* @param endMonth The end month of daylight savings; use the
|
|
* constants in Calendar.
|
|
* @param endday A day in month or a day of week number, as
|
|
* described above.
|
|
* @param endDayOfWeek The end rule day of week; see above.
|
|
* @param endTime A time in millis in standard time.
|
|
* @throws IllegalArgumentException if parameters are invalid or out of
|
|
* range.
|
|
*/
|
|
public SimpleTimeZone(int rawOffset, String id, int startMonth,
|
|
int startDayOfWeekInMonth, int startDayOfWeek,
|
|
int startTime, int endMonth, int endDayOfWeekInMonth,
|
|
int endDayOfWeek, int endTime)
|
|
{
|
|
this.rawOffset = rawOffset;
|
|
setID(id);
|
|
useDaylight = true;
|
|
|
|
setStartRule(startMonth, startDayOfWeekInMonth, startDayOfWeek, startTime);
|
|
setEndRule(endMonth, endDayOfWeekInMonth, endDayOfWeek, endTime);
|
|
if (startMonth == endMonth)
|
|
throw new IllegalArgumentException("startMonth and endMonth must be different");
|
|
this.startYear = 0;
|
|
}
|
|
|
|
/**
|
|
* This constructs a new SimpleTimeZone that supports a daylight savings
|
|
* rule. The parameter are the same as for the constructor above, except
|
|
* there is the additional dstSavaings parameter.
|
|
*
|
|
* @param dstSavings the amount of savings for daylight savings
|
|
* time in milliseconds. This must be positive.
|
|
* @since 1.2
|
|
*/
|
|
public SimpleTimeZone(int rawOffset, String id, int startMonth,
|
|
int startDayOfWeekInMonth, int startDayOfWeek,
|
|
int startTime, int endMonth, int endDayOfWeekInMonth,
|
|
int endDayOfWeek, int endTime, int dstSavings)
|
|
{
|
|
this(rawOffset, id, startMonth, startDayOfWeekInMonth, startDayOfWeek,
|
|
startTime, endMonth, endDayOfWeekInMonth, endDayOfWeek, endTime);
|
|
|
|
this.dstSavings = dstSavings;
|
|
}
|
|
|
|
/**
|
|
* This constructs a new SimpleTimeZone that supports a daylight savings
|
|
* rule. The parameter are the same as for the constructor above, except
|
|
* there are the additional startTimeMode, endTimeMode, and dstSavings
|
|
* parameters.
|
|
*
|
|
* @param startTimeMode the mode that start times are specified in. One of
|
|
* WALL_TIME, STANDARD_TIME, or UTC_TIME.
|
|
* @param endTimeMode the mode that end times are specified in. One of
|
|
* WALL_TIME, STANDARD_TIME, or UTC_TIME.
|
|
* @param dstSavings the amount of savings for daylight savings
|
|
* time in milliseconds. This must be positive.
|
|
* @throws IllegalArgumentException if parameters are invalid or out of
|
|
* range.
|
|
* @since 1.4
|
|
*/
|
|
public SimpleTimeZone(int rawOffset, String id, int startMonth,
|
|
int startDayOfWeekInMonth, int startDayOfWeek,
|
|
int startTime, int startTimeMode, int endMonth,
|
|
int endDayOfWeekInMonth, int endDayOfWeek,
|
|
int endTime, int endTimeMode, int dstSavings)
|
|
{
|
|
this.rawOffset = rawOffset;
|
|
setID(id);
|
|
useDaylight = true;
|
|
|
|
if (startTimeMode < WALL_TIME || startTimeMode > UTC_TIME)
|
|
throw new IllegalArgumentException("startTimeMode must be one of WALL_TIME, STANDARD_TIME, or UTC_TIME");
|
|
if (endTimeMode < WALL_TIME || endTimeMode > UTC_TIME)
|
|
throw new IllegalArgumentException("endTimeMode must be one of WALL_TIME, STANDARD_TIME, or UTC_TIME");
|
|
this.startTimeMode = startTimeMode;
|
|
this.endTimeMode = endTimeMode;
|
|
|
|
setStartRule(startMonth, startDayOfWeekInMonth, startDayOfWeek, startTime);
|
|
setEndRule(endMonth, endDayOfWeekInMonth, endDayOfWeek, endTime);
|
|
if (startMonth == endMonth)
|
|
throw new IllegalArgumentException("startMonth and endMonth must be different");
|
|
this.startYear = 0;
|
|
|
|
this.dstSavings = dstSavings;
|
|
}
|
|
|
|
/**
|
|
* Sets the first year, where daylight savings applies. The daylight
|
|
* savings rule never apply for years in the BC era. Note that this
|
|
* is gregorian calendar specific.
|
|
* @param year the start year.
|
|
*/
|
|
public void setStartYear(int year)
|
|
{
|
|
startYear = year;
|
|
useDaylight = true;
|
|
}
|
|
|
|
/**
|
|
* Checks if the month, day, dayOfWeek arguments are in range and
|
|
* returns the mode of the rule.
|
|
* @param month the month parameter as in the constructor
|
|
* @param day the day parameter as in the constructor
|
|
* @param dayOfWeek the day of week parameter as in the constructor
|
|
* @return the mode of this rule see startMode.
|
|
* @exception IllegalArgumentException if parameters are out of range.
|
|
* @see #SimpleTimeZone(int, String, int, int, int, int, int, int, int, int)
|
|
* @see #startMode
|
|
*/
|
|
private int checkRule(int month, int day, int dayOfWeek)
|
|
{
|
|
if (month < 0 || month > 11)
|
|
throw new IllegalArgumentException("month out of range");
|
|
|
|
int daysInMonth = getDaysInMonth(month, 1);
|
|
if (dayOfWeek == 0)
|
|
{
|
|
if (day <= 0 || day > daysInMonth)
|
|
throw new IllegalArgumentException("day out of range");
|
|
return DOM_MODE;
|
|
}
|
|
else if (dayOfWeek > 0)
|
|
{
|
|
if (Math.abs(day) > (daysInMonth + 6) / 7)
|
|
throw new IllegalArgumentException("dayOfWeekInMonth out of range");
|
|
if (dayOfWeek > Calendar.SATURDAY)
|
|
throw new IllegalArgumentException("dayOfWeek out of range");
|
|
return DOW_IN_MONTH_MODE;
|
|
}
|
|
else
|
|
{
|
|
if (day == 0 || Math.abs(day) > daysInMonth)
|
|
throw new IllegalArgumentException("day out of range");
|
|
if (dayOfWeek < -Calendar.SATURDAY)
|
|
throw new IllegalArgumentException("dayOfWeek out of range");
|
|
if (day < 0)
|
|
return DOW_LE_DOM_MODE;
|
|
else
|
|
return DOW_GE_DOM_MODE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings start rule. You must also set the
|
|
* end rule with <code>setEndRule</code> or the result of
|
|
* getOffset is undefined. For the parameters see the ten-argument
|
|
* constructor above.
|
|
*
|
|
* @param month The month where daylight savings start, zero
|
|
* based. You should use the constants in Calendar.
|
|
* @param day A day of month or day of week in month.
|
|
* @param dayOfWeek The day of week where daylight savings start.
|
|
* @param time The time in milliseconds standard time where daylight
|
|
* savings start.
|
|
* @see SimpleTimeZone
|
|
*/
|
|
public void setStartRule(int month, int day, int dayOfWeek, int time)
|
|
{
|
|
this.startMode = checkRule(month, day, dayOfWeek);
|
|
this.startMonth = month;
|
|
this.startDay = day;
|
|
this.startDayOfWeek = Math.abs(dayOfWeek);
|
|
if (this.startTimeMode == WALL_TIME || this.startTimeMode == STANDARD_TIME)
|
|
this.startTime = time;
|
|
else
|
|
// Convert from UTC to STANDARD
|
|
this.startTime = time + this.rawOffset;
|
|
useDaylight = true;
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings start rule. You must also set the
|
|
* end rule with <code>setEndRule</code> or the result of
|
|
* getOffset is undefined. For the parameters see the ten-argument
|
|
* constructor above.
|
|
*
|
|
* Note that this API isn't incredibly well specified. It appears that the
|
|
* after flag must override the parameters, since normally, the day and
|
|
* dayofweek can select this. I.e., if day < 0 and dayOfWeek < 0, on or
|
|
* before mode is chosen. But if after == true, this implementation
|
|
* overrides the signs of the other arguments. And if dayOfWeek == 0, it
|
|
* falls back to the behavior in the other APIs. I guess this should be
|
|
* checked against Sun's implementation.
|
|
*
|
|
* @param month The month where daylight savings start, zero
|
|
* based. You should use the constants in Calendar.
|
|
* @param day A day of month or day of week in month.
|
|
* @param dayOfWeek The day of week where daylight savings start.
|
|
* @param time The time in milliseconds standard time where daylight
|
|
* savings start.
|
|
* @param after If true, day and dayOfWeek specify first day of week on or
|
|
* after day, else first day of week on or before.
|
|
* @since 1.2
|
|
* @see SimpleTimeZone
|
|
*/
|
|
public void setStartRule(int month, int day, int dayOfWeek, int time,
|
|
boolean after)
|
|
{
|
|
// FIXME: XXX: Validate that checkRule and offset processing work with on
|
|
// or before mode.
|
|
this.startDay = after ? Math.abs(day) : -Math.abs(day);
|
|
this.startDayOfWeek = after ? Math.abs(dayOfWeek) : -Math.abs(dayOfWeek);
|
|
this.startMode = (dayOfWeek != 0)
|
|
? (after ? DOW_GE_DOM_MODE : DOW_LE_DOM_MODE)
|
|
: checkRule(month, day, dayOfWeek);
|
|
this.startDay = Math.abs(this.startDay);
|
|
this.startDayOfWeek = Math.abs(this.startDayOfWeek);
|
|
|
|
this.startMonth = month;
|
|
|
|
if (this.startTimeMode == WALL_TIME || this.startTimeMode == STANDARD_TIME)
|
|
this.startTime = time;
|
|
else
|
|
// Convert from UTC to STANDARD
|
|
this.startTime = time + this.rawOffset;
|
|
useDaylight = true;
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings start rule. You must also set the
|
|
* end rule with <code>setEndRule</code> or the result of
|
|
* getOffset is undefined. For the parameters see the ten-argument
|
|
* constructor above.
|
|
*
|
|
* @param month The month where daylight savings start, zero
|
|
* based. You should use the constants in Calendar.
|
|
* @param day A day of month or day of week in month.
|
|
* @param time The time in milliseconds standard time where daylight
|
|
* savings start.
|
|
* @see SimpleTimeZone
|
|
* @since 1.2
|
|
*/
|
|
public void setStartRule(int month, int day, int time)
|
|
{
|
|
setStartRule(month, day, 0, time);
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings end rule. You must also set the
|
|
* start rule with <code>setStartRule</code> or the result of
|
|
* getOffset is undefined. For the parameters see the ten-argument
|
|
* constructor above.
|
|
*
|
|
* @param month The end month of daylight savings.
|
|
* @param day A day in month, or a day of week in month.
|
|
* @param dayOfWeek A day of week, when daylight savings ends.
|
|
* @param time A time in millis in standard time.
|
|
* @see #setStartRule
|
|
*/
|
|
public void setEndRule(int month, int day, int dayOfWeek, int time)
|
|
{
|
|
this.endMode = checkRule(month, day, dayOfWeek);
|
|
this.endMonth = month;
|
|
this.endDay = day;
|
|
this.endDayOfWeek = Math.abs(dayOfWeek);
|
|
if (this.endTimeMode == WALL_TIME)
|
|
this.endTime = time;
|
|
else if (this.endTimeMode == STANDARD_TIME)
|
|
// Convert from STANDARD to DST
|
|
this.endTime = time + this.dstSavings;
|
|
else
|
|
// Convert from UTC to DST
|
|
this.endTime = time + this.rawOffset + this.dstSavings;
|
|
useDaylight = true;
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings end rule. You must also set the
|
|
* start rule with <code>setStartRule</code> or the result of
|
|
* getOffset is undefined. For the parameters see the ten-argument
|
|
* constructor above.
|
|
*
|
|
* Note that this API isn't incredibly well specified. It appears that the
|
|
* after flag must override the parameters, since normally, the day and
|
|
* dayofweek can select this. I.e., if day < 0 and dayOfWeek < 0, on or
|
|
* before mode is chosen. But if after == true, this implementation
|
|
* overrides the signs of the other arguments. And if dayOfWeek == 0, it
|
|
* falls back to the behavior in the other APIs. I guess this should be
|
|
* checked against Sun's implementation.
|
|
*
|
|
* @param month The end month of daylight savings.
|
|
* @param day A day in month, or a day of week in month.
|
|
* @param dayOfWeek A day of week, when daylight savings ends.
|
|
* @param time A time in millis in standard time.
|
|
* @param after If true, day and dayOfWeek specify first day of week on or
|
|
* after day, else first day of week on or before.
|
|
* @since 1.2
|
|
* @see #setStartRule
|
|
*/
|
|
public void setEndRule(int month, int day, int dayOfWeek, int time,
|
|
boolean after)
|
|
{
|
|
// FIXME: XXX: Validate that checkRule and offset processing work with on
|
|
// or before mode.
|
|
this.endDay = after ? Math.abs(day) : -Math.abs(day);
|
|
this.endDayOfWeek = after ? Math.abs(dayOfWeek) : -Math.abs(dayOfWeek);
|
|
this.endMode = (dayOfWeek != 0)
|
|
? (after ? DOW_GE_DOM_MODE : DOW_LE_DOM_MODE)
|
|
: checkRule(month, day, dayOfWeek);
|
|
this.endDay = Math.abs(this.endDay);
|
|
this.endDayOfWeek = Math.abs(endDayOfWeek);
|
|
|
|
this.endMonth = month;
|
|
|
|
if (this.endTimeMode == WALL_TIME)
|
|
this.endTime = time;
|
|
else if (this.endTimeMode == STANDARD_TIME)
|
|
// Convert from STANDARD to DST
|
|
this.endTime = time + this.dstSavings;
|
|
else
|
|
// Convert from UTC to DST
|
|
this.endTime = time + this.rawOffset + this.dstSavings;
|
|
useDaylight = true;
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings end rule. You must also set the
|
|
* start rule with <code>setStartRule</code> or the result of
|
|
* getOffset is undefined. For the parameters see the ten-argument
|
|
* constructor above.
|
|
*
|
|
* @param month The end month of daylight savings.
|
|
* @param day A day in month, or a day of week in month.
|
|
* @param dayOfWeek A day of week, when daylight savings ends.
|
|
* @param time A time in millis in standard time.
|
|
* @see #setStartRule
|
|
*/
|
|
public void setEndRule(int month, int day, int time)
|
|
{
|
|
setEndRule(month, day, 0, time);
|
|
}
|
|
|
|
/**
|
|
* Gets the time zone offset, for current date, modified in case of
|
|
* daylight savings. This is the offset to add to UTC to get the local
|
|
* time.
|
|
*
|
|
* In the standard JDK the results given by this method may result in
|
|
* inaccurate results at the end of February or the beginning of March.
|
|
* To avoid this, you should use Calendar instead:
|
|
* <code>offset = cal.get(Calendar.ZONE_OFFSET)
|
|
* + cal.get(Calendar.DST_OFFSET);</code>
|
|
*
|
|
* This version doesn't suffer this inaccuracy.
|
|
*
|
|
* The arguments don't follow the approach for setting start and end rules.
|
|
* The day must be a positive number and dayOfWeek must be a positive value
|
|
* from Calendar. dayOfWeek is redundant, but must match the other values
|
|
* or an inaccurate result may be returned.
|
|
*
|
|
* @param era the era of the given date
|
|
* @param year the year of the given date
|
|
* @param month the month of the given date, 0 for January.
|
|
* @param day the day of month
|
|
* @param dayOfWeek the day of week; this must match the other fields.
|
|
* @param millis the millis in the day (in local standard time)
|
|
* @return the time zone offset in milliseconds.
|
|
* @throws IllegalArgumentException if arguments are incorrect.
|
|
*/
|
|
public int getOffset(int era, int year, int month, int day, int dayOfWeek,
|
|
int millis)
|
|
{
|
|
int daysInMonth = getDaysInMonth(month, year);
|
|
if (day < 1 || day > daysInMonth)
|
|
throw new IllegalArgumentException("day out of range");
|
|
if (dayOfWeek < Calendar.SUNDAY || dayOfWeek > Calendar.SATURDAY)
|
|
throw new IllegalArgumentException("dayOfWeek out of range");
|
|
if (month < Calendar.JANUARY || month > Calendar.DECEMBER)
|
|
throw new IllegalArgumentException("month out of range:" + month);
|
|
|
|
// This method is called by Calendar, so we mustn't use that class.
|
|
int daylightSavings = 0;
|
|
if (useDaylight && era == GregorianCalendar.AD && year >= startYear)
|
|
{
|
|
// This does only work for Gregorian calendars :-(
|
|
// This is mainly because setStartYear doesn't take an era.
|
|
boolean afterStart = ! isBefore(year, month, day, dayOfWeek, millis,
|
|
startMode, startMonth, startDay,
|
|
startDayOfWeek, startTime);
|
|
boolean beforeEnd = isBefore(year, month, day, dayOfWeek,
|
|
millis + dstSavings,
|
|
endMode, endMonth, endDay, endDayOfWeek,
|
|
endTime);
|
|
|
|
if (startMonth < endMonth)
|
|
// use daylight savings, if the date is after the start of
|
|
// savings, and before the end of savings.
|
|
daylightSavings = afterStart && beforeEnd ? dstSavings : 0;
|
|
else
|
|
// use daylight savings, if the date is before the end of
|
|
// savings, or after the start of savings.
|
|
daylightSavings = beforeEnd || afterStart ? dstSavings : 0;
|
|
}
|
|
return rawOffset + daylightSavings;
|
|
}
|
|
|
|
/**
|
|
* Returns the time zone offset to GMT in milliseconds, ignoring
|
|
* day light savings.
|
|
* @return the time zone offset.
|
|
*/
|
|
public int getRawOffset()
|
|
{
|
|
return rawOffset;
|
|
}
|
|
|
|
/**
|
|
* Sets the standard time zone offset to GMT.
|
|
* @param rawOffset The time offset from GMT in milliseconds.
|
|
*/
|
|
public void setRawOffset(int rawOffset)
|
|
{
|
|
this.rawOffset = rawOffset;
|
|
}
|
|
|
|
/**
|
|
* Gets the daylight savings offset. This is a positive offset in
|
|
* milliseconds with respect to standard time. Typically this
|
|
* is one hour, but for some time zones this may be half an our.
|
|
* @return the daylight savings offset in milliseconds.
|
|
*
|
|
* @since 1.2
|
|
*/
|
|
public int getDSTSavings()
|
|
{
|
|
return dstSavings;
|
|
}
|
|
|
|
/**
|
|
* Sets the daylight savings offset. This is a positive offset in
|
|
* milliseconds with respect to standard time.
|
|
*
|
|
* @param dstSavings the daylight savings offset in milliseconds.
|
|
*
|
|
* @since 1.2
|
|
*/
|
|
public void setDSTSavings(int dstSavings)
|
|
{
|
|
if (dstSavings <= 0)
|
|
throw new IllegalArgumentException("illegal value for dstSavings");
|
|
|
|
this.dstSavings = dstSavings;
|
|
}
|
|
|
|
/**
|
|
* Returns if this time zone uses daylight savings time.
|
|
* @return true, if we use daylight savings time, false otherwise.
|
|
*/
|
|
public boolean useDaylightTime()
|
|
{
|
|
return useDaylight;
|
|
}
|
|
|
|
/**
|
|
* Returns the number of days in the given month.
|
|
* Uses gregorian rules prior to 1582 (The default and earliest cutover)
|
|
* @param month The month, zero based; use one of the Calendar constants.
|
|
* @param year The year.
|
|
*/
|
|
private int getDaysInMonth(int month, int year)
|
|
{
|
|
if (month == Calendar.FEBRUARY)
|
|
{
|
|
if ((year & 3) != 0)
|
|
return 28;
|
|
|
|
// Assume default Gregorian cutover,
|
|
// all years prior to this must be Julian
|
|
if (year < 1582)
|
|
return 29;
|
|
|
|
// Gregorian rules
|
|
return ((year % 100) != 0 || (year % 400) == 0) ? 29 : 28;
|
|
}
|
|
else
|
|
return monthArr[month];
|
|
}
|
|
|
|
/**
|
|
* Checks if the date given in calXXXX, is before the change between
|
|
* dst and standard time.
|
|
* @param calYear the year of the date to check (for leap day checking).
|
|
* @param calMonth the month of the date to check.
|
|
* @param calDay the day of month of the date to check.
|
|
* @param calDayOfWeek the day of week of the date to check.
|
|
* @param calMillis the millis of day of the date to check (standard time).
|
|
* @param mode the change mode; same semantic as startMode.
|
|
* @param month the change month; same semantic as startMonth.
|
|
* @param day the change day; same semantic as startDay.
|
|
* @param dayOfWeek the change day of week;
|
|
* @param millis the change time in millis since midnight standard time.
|
|
* same semantic as startDayOfWeek.
|
|
* @return true, if cal is before the change, false if cal is on
|
|
* or after the change.
|
|
*/
|
|
private boolean isBefore(int calYear, int calMonth, int calDayOfMonth,
|
|
int calDayOfWeek, int calMillis, int mode,
|
|
int month, int day, int dayOfWeek, int millis)
|
|
{
|
|
// This method is called by Calendar, so we mustn't use that class.
|
|
// We have to do all calculations by hand.
|
|
// check the months:
|
|
// XXX - this is not correct:
|
|
// for the DOW_GE_DOM and DOW_LE_DOM modes the change date may
|
|
// be in a different month.
|
|
if (calMonth != month)
|
|
return calMonth < month;
|
|
|
|
// check the day:
|
|
switch (mode)
|
|
{
|
|
case DOM_MODE:
|
|
if (calDayOfMonth != day)
|
|
return calDayOfMonth < day;
|
|
break;
|
|
case DOW_IN_MONTH_MODE:
|
|
{
|
|
// This computes the day of month of the day of type
|
|
// "dayOfWeek" that lies in the same (sunday based) week as cal.
|
|
calDayOfMonth += (dayOfWeek - calDayOfWeek);
|
|
|
|
// Now we convert it to 7 based number (to get a one based offset
|
|
// after dividing by 7). If we count from the end of the
|
|
// month, we get want a -7 based number counting the days from
|
|
// the end:
|
|
if (day < 0)
|
|
calDayOfMonth -= getDaysInMonth(calMonth, calYear) + 7;
|
|
else
|
|
calDayOfMonth += 6;
|
|
|
|
// day > 0 day < 0
|
|
// S M T W T F S S M T W T F S
|
|
// 7 8 9 10 11 12 -36-35-34-33-32-31
|
|
// 13 14 15 16 17 18 19 -30-29-28-27-26-25-24
|
|
// 20 21 22 23 24 25 26 -23-22-21-20-19-18-17
|
|
// 27 28 29 30 31 32 33 -16-15-14-13-12-11-10
|
|
// 34 35 36 -9 -8 -7
|
|
// Now we calculate the day of week in month:
|
|
int week = calDayOfMonth / 7;
|
|
|
|
// day > 0 day < 0
|
|
// S M T W T F S S M T W T F S
|
|
// 1 1 1 1 1 1 -5 -5 -4 -4 -4 -4
|
|
// 1 2 2 2 2 2 2 -4 -4 -4 -3 -3 -3 -3
|
|
// 2 3 3 3 3 3 3 -3 -3 -3 -2 -2 -2 -2
|
|
// 3 4 4 4 4 4 4 -2 -2 -2 -1 -1 -1 -1
|
|
// 4 5 5 -1 -1 -1
|
|
if (week != day)
|
|
return week < day;
|
|
|
|
if (calDayOfWeek != dayOfWeek)
|
|
return calDayOfWeek < dayOfWeek;
|
|
|
|
// daylight savings starts/ends on the given day.
|
|
break;
|
|
}
|
|
case DOW_LE_DOM_MODE:
|
|
// The greatest sunday before or equal December, 12
|
|
// is the same as smallest sunday after or equal December, 6.
|
|
day = Math.abs(day) - 6;
|
|
case DOW_GE_DOM_MODE:
|
|
// Calculate the day of month of the day of type
|
|
// "dayOfWeek" that lies before (or on) the given date.
|
|
calDayOfMonth -= (calDayOfWeek < dayOfWeek ? 7 : 0) + calDayOfWeek
|
|
- dayOfWeek;
|
|
if (calDayOfMonth < day)
|
|
return true;
|
|
if (calDayOfWeek != dayOfWeek || calDayOfMonth >= day + 7)
|
|
return false;
|
|
|
|
// now we have the same day
|
|
break;
|
|
}
|
|
|
|
// the millis decides:
|
|
return (calMillis < millis);
|
|
}
|
|
|
|
/**
|
|
* Determines if the given date is in daylight savings time.
|
|
* @return true, if it is in daylight savings time, false otherwise.
|
|
*/
|
|
public boolean inDaylightTime(Date date)
|
|
{
|
|
Calendar cal = Calendar.getInstance(this);
|
|
cal.setTime(date);
|
|
return (cal.get(Calendar.DST_OFFSET) != 0);
|
|
}
|
|
|
|
/**
|
|
* Generates the hashCode for the SimpleDateFormat object. It is
|
|
* the rawOffset, possibly, if useDaylightSavings is true, xored
|
|
* with startYear, startMonth, startDayOfWeekInMonth, ..., endTime.
|
|
*/
|
|
public synchronized int hashCode()
|
|
{
|
|
return rawOffset
|
|
^ (useDaylight
|
|
? startMonth ^ startDay ^ startDayOfWeek ^ startTime ^ endMonth
|
|
^ endDay ^ endDayOfWeek ^ endTime : 0);
|
|
}
|
|
|
|
public synchronized boolean equals(Object o)
|
|
{
|
|
if (this == o)
|
|
return true;
|
|
if (! (o instanceof SimpleTimeZone))
|
|
return false;
|
|
SimpleTimeZone zone = (SimpleTimeZone) o;
|
|
if (zone.hashCode() != hashCode() || ! getID().equals(zone.getID())
|
|
|| rawOffset != zone.rawOffset || useDaylight != zone.useDaylight)
|
|
return false;
|
|
if (! useDaylight)
|
|
return true;
|
|
return (startYear == zone.startYear && startMonth == zone.startMonth
|
|
&& startDay == zone.startDay
|
|
&& startDayOfWeek == zone.startDayOfWeek
|
|
&& startTime == zone.startTime
|
|
&& startTimeMode == zone.startTimeMode && endMonth == zone.endMonth
|
|
&& endDay == zone.endDay && endDayOfWeek == zone.endDayOfWeek
|
|
&& endTime == zone.endTime && endTimeMode == zone.endTimeMode);
|
|
}
|
|
|
|
/**
|
|
* Test if the other time zone uses the same rule and only
|
|
* possibly differs in ID. This implementation for this particular
|
|
* class will return true if the other object is a SimpleTimeZone,
|
|
* the raw offsets and useDaylight are identical and if useDaylight
|
|
* is true, also the start and end datas are identical.
|
|
* @return true if this zone uses the same rule.
|
|
*/
|
|
public boolean hasSameRules(TimeZone other)
|
|
{
|
|
if (this == other)
|
|
return true;
|
|
if (! (other instanceof SimpleTimeZone))
|
|
return false;
|
|
SimpleTimeZone zone = (SimpleTimeZone) other;
|
|
if (zone.hashCode() != hashCode() || rawOffset != zone.rawOffset
|
|
|| useDaylight != zone.useDaylight)
|
|
return false;
|
|
if (! useDaylight)
|
|
return true;
|
|
return (startYear == zone.startYear && startMonth == zone.startMonth
|
|
&& startDay == zone.startDay
|
|
&& startDayOfWeek == zone.startDayOfWeek
|
|
&& startTime == zone.startTime
|
|
&& startTimeMode == zone.startTimeMode && endMonth == zone.endMonth
|
|
&& endDay == zone.endDay && endDayOfWeek == zone.endDayOfWeek
|
|
&& endTime == zone.endTime && endTimeMode == zone.endTimeMode);
|
|
}
|
|
|
|
/**
|
|
* Returns a string representation of this SimpleTimeZone object.
|
|
* @return a string representation of this SimpleTimeZone object.
|
|
*/
|
|
public String toString()
|
|
{
|
|
// the test for useDaylight is an incompatibility to jdk1.2, but
|
|
// I think this shouldn't hurt.
|
|
return getClass().getName() + "[" + "id=" + getID() + ",offset="
|
|
+ rawOffset + ",dstSavings=" + dstSavings + ",useDaylight="
|
|
+ useDaylight
|
|
+ (useDaylight
|
|
? ",startYear=" + startYear + ",startMode=" + startMode
|
|
+ ",startMonth=" + startMonth + ",startDay=" + startDay
|
|
+ ",startDayOfWeek=" + startDayOfWeek + ",startTime="
|
|
+ startTime + ",startTimeMode=" + startTimeMode + ",endMode="
|
|
+ endMode + ",endMonth=" + endMonth + ",endDay=" + endDay
|
|
+ ",endDayOfWeek=" + endDayOfWeek + ",endTime=" + endTime
|
|
+ ",endTimeMode=" + endTimeMode : "") + "]";
|
|
}
|
|
|
|
/**
|
|
* Reads a serialized simple time zone from stream.
|
|
* @see #writeObject
|
|
*/
|
|
private void readObject(java.io.ObjectInputStream input)
|
|
throws java.io.IOException, ClassNotFoundException
|
|
{
|
|
input.defaultReadObject();
|
|
if (serialVersionOnStream == 0)
|
|
{
|
|
// initialize the new fields to default values.
|
|
dstSavings = 60 * 60 * 1000;
|
|
endMode = DOW_IN_MONTH_MODE;
|
|
startMode = DOW_IN_MONTH_MODE;
|
|
startTimeMode = WALL_TIME;
|
|
endTimeMode = WALL_TIME;
|
|
serialVersionOnStream = 2;
|
|
}
|
|
else
|
|
{
|
|
int length = input.readInt();
|
|
byte[] byteArray = new byte[length];
|
|
input.read(byteArray, 0, length);
|
|
if (length >= 4)
|
|
{
|
|
// Lets hope that Sun does extensions to the serialized
|
|
// form in a sane manner.
|
|
startDay = byteArray[0];
|
|
startDayOfWeek = byteArray[1];
|
|
endDay = byteArray[2];
|
|
endDayOfWeek = byteArray[3];
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Serializes this object to a stream. @serialdata The object is
|
|
* first written in the old JDK 1.1 format, so that it can be read
|
|
* by by the old classes. This means, that the
|
|
* <code>start/endDay(OfWeek)</code>-Fields are written in the
|
|
* DOW_IN_MONTH_MODE rule, since this was the only supported rule
|
|
* in 1.1.
|
|
*
|
|
* In the optional section, we write first the length of an byte
|
|
* array as int and afterwards the byte array itself. The byte
|
|
* array contains in this release four elements, namely the real
|
|
* startDay, startDayOfWeek endDay, endDayOfWeek in that Order.
|
|
* These fields are needed, because for compatibility reasons only
|
|
* approximative values are written to the required section, as
|
|
* described above.
|
|
*/
|
|
private void writeObject(java.io.ObjectOutputStream output)
|
|
throws java.io.IOException
|
|
{
|
|
byte[] byteArray = new byte[]
|
|
{
|
|
(byte) startDay, (byte) startDayOfWeek, (byte) endDay,
|
|
(byte) endDayOfWeek
|
|
};
|
|
|
|
/* calculate the approximation for JDK 1.1 */
|
|
switch (startMode)
|
|
{
|
|
case DOM_MODE:
|
|
startDayOfWeek = Calendar.SUNDAY; // random day of week
|
|
|
|
// fall through
|
|
case DOW_GE_DOM_MODE:
|
|
case DOW_LE_DOM_MODE:
|
|
startDay = (startDay + 6) / 7;
|
|
}
|
|
switch (endMode)
|
|
{
|
|
case DOM_MODE:
|
|
endDayOfWeek = Calendar.SUNDAY;
|
|
|
|
// fall through
|
|
case DOW_GE_DOM_MODE:
|
|
case DOW_LE_DOM_MODE:
|
|
endDay = (endDay + 6) / 7;
|
|
}
|
|
|
|
// the required part:
|
|
output.defaultWriteObject();
|
|
// the optional part:
|
|
output.writeInt(byteArray.length);
|
|
output.write(byteArray, 0, byteArray.length);
|
|
}
|
|
}
|