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/* Copyright (C) 1998, 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.util;
/**
* @author Per Bothner <bothner@cygnus.com>
* @date October 24, 1998.
*/
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3.
* Status: Does not know how to figure out if daylight savings time
* is in effect; hence only correct for zones without DST.
* No known spec for hashCode.
*/
public class SimpleTimeZone extends TimeZone
{
// The fields are as specified in Sun's "Serialized Form"
// in the JDK 1.2 beta 4 API specification.
int dstSavings = 60 * 60 * 1000;
int rawOffset;
// int serialVersionOnStream;
int startDay;
int startDayOfWeek;
int startMode; /// Seems to be JDK 1.2 only.
int startMonth;
int startTime;
int startYear;
int endDay;
int endDayOfWeek;
int endMode; // Seems to be JDK 1.2 only.
int endMonth;
int endTime;
// byte[] monthLength;
boolean useDaylight;
public SimpleTimeZone (int rawOffset, String ID)
{
setID(ID);
this.rawOffset = rawOffset;
}
public SimpleTimeZone (int rawOffset, String ID,
int startMonth, int startDay,
int startDayOfWeek, int startTime,
int endMonth, int endDay,
int endDayOfWeek, int endTime)
{
this(rawOffset, ID);
setStartRule (startMonth, startDay, startDayOfWeek, startTime);
setEndRule (endMonth, endDay, endDayOfWeek, endTime);
}
public int getRawOffset() { return rawOffset; }
public void setRawOffset (int offsetMillis) { rawOffset = offsetMillis; }
public int getOffset (int era, int year, int month, int day,
int dayOfWeek, int millis)
{
int offset = getRawOffset();
if (useDaylight)
{
if (startYear != 0
&& (year < startYear || era == GregorianCalendar.BC))
return offset;
boolean midYearSummer = startMonth < endMonth;
if (midYearSummer ? (month < startMonth || month > endMonth)
: (month < startMonth && month > endMonth))
return offset; // Definitely not DST.
if (midYearSummer ? (month > startMonth && month < endMonth)
: (month > startMonth || month < endMonth))
return offset + dstSavings; // Definitely DST.
// Now it gets more complicated. Bail for now.
throw new Error("not implemented - SimpleTimeZone.getOffset");
}
return offset;
}
public boolean useDaylightTime() { return useDaylight; }
public boolean inDaylightTime(Date date)
{
if (! useDaylight)
return false;
throw new Error("not implemented - SimpleTimeZone.inDaylightTime");
}
public int getDSTSavings () { return dstSavings; }
public void setDSTSavings (int millisSavedDuringDST)
{ dstSavings = millisSavedDuringDST; }
public void setStartRule (int month, int dayOfWeekInMonth,
int dayOfWeek, int time)
{
this.startMonth = month;
this.startDay = dayOfWeekInMonth;
this.startDayOfWeek = dayOfWeek;
this.startTime = time;
this.useDaylight = true;
}
public void setEndRule (int month, int dayOfWeekInMonth,
int dayOfWeek, int time)
{
this.endMonth = month;
this.endDay = dayOfWeekInMonth;
this.endDayOfWeek = dayOfWeek;
this.endTime = time;
this.useDaylight = true;
}
public void setStartYear (int year)
{
this.startYear = startYear;
}
public boolean hasSameRules (TimeZone other)
{
if (this == other)
return true;
if (! (other instanceof SimpleTimeZone))
return false;
SimpleTimeZone o = (SimpleTimeZone) other;
if (rawOffset != o.rawOffset)
return false;
if (useDaylight != o.useDaylight)
return false;
if (! useDaylight)
return true;
return startDay == o.startDay
&& startDayOfWeek == o.startDayOfWeek
&& startMonth == o.startMonth
&& startTime == o.startTime
&& endDay == o.endDay
&& endDayOfWeek == o.endDayOfWeek
&& endMonth == o.endMonth
&& endTime == o.endTime
&& startYear == o.startYear
&& startMode == o.startMode
&& endMode == o.endMode;
}
public boolean equals (Object obj)
{
if (! (obj instanceof SimpleTimeZone))
return false;
SimpleTimeZone other = (SimpleTimeZone) obj;
return getID() == other.getID() && hasSameRules(other);
}
public int hashCode ()
{
// FIXME - this does not folow any spec (since none is public)!
int hash = rawOffset;
if (useDaylight)
hash += dstSavings + startYear + startMode + endMode
+ startDay + startDayOfWeek + startMonth + startTime
+ endDay + endDayOfWeek + endMonth + endTime;
return hash;
}
}
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