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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.foundation;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
/**
* A pure java implementation of NSDate that extends
* java.util.Date for greater java compatibility.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 892 $
*/
public class NSDate extends Date
{
// NSComparisonResult compatibility
public static final int NSOrderedAscending = -1;
public static final int NSOrderedSame = 0;
public static final int NSOrderedDescending = 1;
// public static final double TimeIntervalSince1970;
// public static final NSDate DateFor1970;
/**
* Default constructor represents the current date.
*/
public NSDate ()
{
super();
}
/**
* Represents the specified number of seconds from the current date.
*/
public NSDate (double seconds)
{
super( (long) new NSDate().getTime() +
timeIntervalToMilliseconds(seconds) );
}
/**
* Represents the specified number of seconds from the specified date.
*/
public NSDate (double seconds, Date sinceDate)
{
super( (long) sinceDate.getTime() +
timeIntervalToMilliseconds(seconds) );
}
/**
* Returns the interval between this date and 1 January 2001 GMT.
*/
public double timeIntervalSinceReferenceDate ()
{
GregorianCalendar referenceDate =
new GregorianCalendar( TimeZone.getTimeZone( "GMT" ) );
referenceDate.set( 2001, 0, 0, 0, 0, 0 );
return timeIntervalSinceDate( referenceDate.getTime() );
}
/**
* Returns the interval between this date and the specified date
* in seconds.
*/
public double timeIntervalSinceDate (Date aDate)
{
return millisecondsToTimeInterval(
this.getTime() - aDate.getTime() );
}
/**
* Returns the interval between this date and the current date
* in seconds.
*/
public double timeIntervalSinceNow ()
{
return timeIntervalSinceDate( new NSDate() );
}
/**
* Compares this date to the specified date and returns the
* earlier date. Unspecified which is returned if both are equal.
*/
public NSDate earlierDate (NSDate aDate)
{
if ( aDate == null ) return this;
if ( after( aDate ) ) return aDate;
return this;
}
/**
* Compares this date to the specified date and returns the
* later date. Unspecified which is returned if both are equal.
*/
public NSDate laterDate (NSDate aDate)
{
if ( aDate == null ) return this;
if ( before( aDate ) ) return aDate;
return this;
}
/**
* Returns a negative value if the specified date is later than
* this date, a positive value if the specified date is earlier
* than this date, or zero if the dates are equal. The return
* values are compatible with type NSComparisonResult.
*/
public int compare (Date aDate)
{
if ( before( aDate ) ) return NSOrderedAscending;
if ( after( aDate ) ) return NSOrderedDescending;
return NSOrderedSame;
}
/**
* Returns whether the this date is equal to the specified date,
* per the result of equals().
*/
public boolean isEqualToDate (Date aDate)
{
return equals( aDate );
}
/**
* Returns a date that differs from this date by the specified
* number of seconds.
*/
public NSDate dateByAddingTimeInterval (double seconds)
{
return new NSDate( seconds, this );
}
/**
* Returns the number of seconds between now and the reference date.
*/
public static double currentTimeIntervalSinceReferenceDate ()
{
return new NSDate().timeIntervalSinceReferenceDate();
}
/**
* Converts seconds to milliseconds. Included for compatibility.
*/
public static long timeIntervalToMilliseconds (double seconds)
{
return (long) seconds*1000;
}
/**
* Converts milliseconds to seconds. Included for compatibility.
*/
public static double millisecondsToTimeInterval (long millis)
{
return millis/1000.0;
}
/**
* Returns a date that is greater than all representable dates.
*/
public static NSDate distantFuture ()
{
NSDate result = new NSDate();
result.setTime( Long.MAX_VALUE );
return result;
}
/**
* Returns a date that is less than all representable dates.
*/
public static NSDate distantPast ()
{
NSDate result = new NSDate();
result.setTime( Long.MIN_VALUE );
return result;
}
// inherited from java.util.Date
// public java.lang.String toString ();
// public boolean equals (java.lang.Object);
// public int hashCode ();
}
/*
* $Log$
* Revision 1.1 2006/02/16 12:47:16 cgruber
* Check in all sources in eclipse-friendly maven-enabled packages.
*
* Revision 1.1.1.1 2000/12/21 15:47:28 mpowers
* Contributing wotonomy.
*
* Revision 1.3 2000/12/20 16:25:38 michael
* Added log to all files.
*
*
*/
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