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From Murray Altheim <>
Subject Re: [jira] Created: (JSPWIKI-110) time machine
Date Tue, 18 Dec 2007 09:49:38 GMT
Janne Jalkanen wrote:
>> I haven't been looking at Java Content Repository (JSR-170/283) in
>> depth (will do this soon), but I guess with underlying JCR support
>> this feature won't be a big thing to implement.
> Might be.  I have a nagging feeling that the versioning support of JCR 
> is not what we want.  The check-in/check-out process is not really 
> designed for this kind of an usecase.

With the existing WikiPageProvider API I was thinking of something akin
to adding a single method to support this (which is after all a pretty
common archiving feature):

     *  Returns the most recent version number of the wiki page
     *  as of the Date <tt>date</tt>. If the page did not exist
     *  at that time, returns -1.
    public int getVersionAsOfDate( String page, Date date )
            throws ProviderException;

This would then permit the addition of a "time machine" that would put
together a catalog of the pages based on their versions as of that Date.
I.e., the time machine would simply create an alternative set of wiki
pages as of a given date.


Murray Altheim <murray07 at>                           ===  = =                                     = =  ===
SGML Grease Monkey, Banjo Player, Wantanabe Zen Monk               = =  = =

       Boundless wind and moon - the eye within eyes,
       Inexhaustible heaven and earth - the light beyond light,
       The willow dark, the flower bright - ten thousand houses,
       Knock at any door - there's one who will respond.
                                       -- The Blue Cliff Record

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