"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

AbstractTime subclass:#AbsoluteTime

	 instanceVariableNames:'osTime'

	 classVariableNames:''

	 poolDictionaries:''

	 category:'Magnitude-General'

!

!AbsoluteTime class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    This class represents time values in seconds from 1st. Jan 1970, as

    used in the Unix operating system. Its implementation is not the same

    as in ST-80 (which represents Time as seconds from 1. Jan 1901.

    Actually, the implementation does not depend or even know which time/date 

    the OperatingSystem bases its time upon - it is simply keeping the value(s)

    as return from the OS.

    For conversion, these values are given back to the OS, which will know

    how to convert these times.

    This has the advantage, that time-stamps on files (such as last-access-

    time or last-modifiaction-time) can be handled transparent to other

    times (especially comparison).

    Since unix-times are 32 bit which does not fit into a SmallInteger, 

    we keep low and hi 16bits of the time separately (it could have been 

    implemented using LargeIntegers though).

    This class should not be confused with Time (which only represents the

    time within one day). Time instances cannot be used to compare times across

    midnight; instances of AbsoluteTime can.

    See Time for more details.

"

! !

!AbsoluteTime class methodsFor:'instance creation'!

day:d month:m year:y hour:h minutes:min seconds:s

    "return an instance of the receiver"

    ^ self basicNew 

	fromOSTime:(OperatingSystem 

			computeTimePartsFromYear:y month:m day:d 

					    hour:h minute:min seconds:s)

    "

     AbsoluteTime day:2 month:1 year:1991 hour:12 minutes:30 seconds:0 

     AbsoluteTime day:8 month:1 year:1995 hour:0 minutes:43 seconds:48 

    "

!

fromDate:aDate andTime:aTime

    "return an instance of the receiver, initialized from a time and a date

     object."

    ^ self 

	day:aDate day 

	month:aDate month 

	year:aDate year 

	hour:aTime hours 

	minutes:aTime minutes 

	seconds:aTime seconds 

    "

     AbsoluteTime date:Date today time:Time now 

    "

    "Modified: 8.9.1995 / 15:07:30 / claus"

!

readFrom:aStringOrStream onError:exceptionBlock

    "return a new AbsoluteTime, reading a printed representation from aStream.

     The string is interpreted as 24 hour format, as printed.

     Notice, that this is not the storeString format and 

     is different from the format expected by readFrom:."

    |str day month year hour min sec ex|

    str := aStringOrStream readStream.

    ex := [^ exceptionBlock value].

    day := Integer readFrom:str onError:ex.

    (day between:1 and:31) ifFalse:[ex value].

    [str peek isDigit] whileFalse:[str next].

    month := Integer readFrom:str onError:ex.

    (month between:1 and:12) ifFalse:[ex value].

    [str peek isDigit] whileFalse:[str next].

    year := Integer readFrom:str onError:ex.

    [str peek isDigit] whileFalse:[str next].

    hour := Integer readFrom:str onError:ex.

    (hour between:0 and:24) ifFalse:[ex value].

    [str peek isDigit] whileFalse:[str next].

    min := Integer readFrom:str onError:ex.

    (min between:0 and:59) ifFalse:[ex value].

    [str peek isDigit] whileFalse:[str next].

    sec := Integer readFrom:str onError:ex.

    (sec between:0 and:59) ifFalse:[ex value].

    "special check"

    hour == 24 ifTrue:[

	(min ~~ 0 or:[sec ~~ 0]) ifTrue:[ex value].

    ].

    ^ self day:day month:month year:year hour:hour minutes:min seconds:sec

    "

     AbsoluteTime readFrom:'20-2-1995 13:11:06'    

    "

    "Modified: 16.11.1995 / 22:49:39 / cg"

! !

!AbsoluteTime methodsFor:'accessing'!

day

    "return the day-in-month of the receiver (1..31).

     For compatibility, use instances of Date for this."

    |d|

    OperatingSystem computeDatePartsOf:osTime for:[:year :month :day |

	d := day

    ].

    ^ d

    "

     AbsoluteTime now day 

    "

!

hours

    "return the hours (0..23)"

    |hr|

    OperatingSystem computeTimePartsOf:osTime for:[:hours :minutes :secs |

	hr := hours

    ].

    ^ hr

    "

     AbsoluteTime now hours 

    "

!

minutes

    "return the minutes (0..59)"

    |m|

    OperatingSystem computeTimePartsOf:osTime for:[:hours :minutes :secs |

	m := minutes

    ].

    ^ m

    "

     AbsoluteTime now minutes 

    "

!

seconds

    "return the seconds (0..59)"

    |s|

    OperatingSystem computeTimePartsOf:osTime for:[:hours :minutes :secs |

	s := secs

    ].

    ^ s

    "

     AbsoluteTime now seconds 

    "

!

    "

    "

! !

!AbsoluteTime methodsFor:'arithmetic'!

- aTime

    "return the delta in seconds between 2 times."

    ^ self getSeconds - (aTime getSeconds)

!

addDays:numberOfDays

    "return a new instance of myself, numberOfDays afterwards."

    ^ self addSeconds:(numberOfDays * (60 * 60 * 24))

    "

     |t|

     t := AbsoluteTime now.

     t printNL.

     (t addDays:7) printNL

    "

!

subtractDays:numberOfDays

    "return a new instance of myself, numberOfDays before."

    ^ self subtractSeconds:(numberOfDays * (60 * 60 * 24))

    "

     |t|

     t := AbsoluteTime now.

     t printNL.

     (t subtractDays:50) printNL

    "

! !

!AbsoluteTime methodsFor:'printing & storing'!

printOn:aStream

    "append a user readable representation of the receiver to aStream.

     The format is compatible with readFromString:, but not with readFrom:."

    |h min s d m y|

    OperatingSystem computeDatePartsOf:osTime for:[

	:year :month :day | d := day. m := month. y := year.

    ].

    OperatingSystem computeTimePartsOf:osTime for:[

	:hours :minutes :secs | h := hours. min := minutes. s := secs.

    ].

    d printOn:aStream.

    aStream nextPut:$-.

    m printOn:aStream.

    aStream nextPut:$-.

    y printOn:aStream.

    aStream space.

    h printOn:aStream leftPaddedTo:2 with:$0. 

    aStream nextPut:$:.

    min printOn:aStream leftPaddedTo:2 with:$0.

    aStream nextPut:$:.

    s printOn:aStream leftPaddedTo:2 with:$0.

    "

     AbsoluteTime now printOn:Transcript. Transcript cr. 

     (AbsoluteTime fromSeconds:0) printOn:Transcript. Transcript cr.

     Time now printOn:Transcript. Transcript cr.           

     Date today printOn:Transcript. Transcript cr.        

    "

!

storeOn:aStream

    "store the receiver in a format suitable for reconstruction of the

     receiver via readFrom:"

    aStream nextPut:$(; 

	    nextPutAll:self class name; 

	    nextPutAll:' new setSeconds:'.

    self getSeconds storeOn:aStream.

    aStream nextPut:$).

    "

     AbsoluteTime now storeString 

     AbsoluteTime readFrom:(AbsoluteTime now storeString) readStream

    "

! !