Re: [xwiki-users] help how to inherit a class from another

7 Jan 2014

      mn... I think it works for me.
Thanks for your advice.

P.S. They implement class, why not inheritance?

2014/1/7 Valdis Vītoliņš <[email protected]>
...
If you add different objects from several classes to XWiki document,
common problem is that for document representation sheet of first found
class is used.
Therefore for composite objects you need to add
XWiki.DocumentSheetBinding object
which points to sheet document, with content like this (not tested!):
{{velocity}}
#set($obj1=$doc.getObject('Space.Obj1Class'))
#set($obj2=$doc.getObject('Space.Obj2Class'))
...
#if($obj1)
#set($class1=obj1.xWikiClass)
#foreach($prop in $class1.properties)
|$prop.prettyName|$doc.display($prop.getName($obj1))
#end
#end
...
#if($obj2)
....
Look at
http://extensions.xwiki.org/xwiki/bin/view/Extension/Sheet+Module
for more. Note that you can save all these objects in specific template.
Valdis
...
hi,
Thanks for your answer.
Currently I am using a set of classes to represent my data, for
display part they just need to directly show the properties. If I use
composit, for the common part I need to identify if it's common, and
there will be some "if-else" in each of the subclasses.
I just wandering if we can have some auto-load, so that I don't need
to use "if-else" everywhere, and it will be easy to maintain, just
like the inherited class.
2014/1/5 Valdis Vītoliņš <[email protected]>
        If you mean these classes defined in class editor defined
        in .../xwiki/bin/view/XWiki/XWikiClasses
        AFAIK these doesn't support extension.
So, you need to use composition instead. Add object with type
        of the
        common class, and for few other documents add another object
        with type
        of "extended" class.
You will need to adjust class sheet object to display fields
        of other
        tyepe of objects also (look at
        http://extensions.xwiki.org/xwiki/bin/view/Extension/Sheet
        +Module )
Valdis
> hi,
        >
        > the Class I mean is XClass, which is used in Wiki pages.
        >
        > thanks,
        > B.R./ZZH
        >
        >
        > 2014/1/5 Zhihua Zheng <[email protected]>
        >
        > > hi all,
        > >
        > > I have couple of classes they are similar, most of them
        are the same, but
        > > some small parts are different. So that I want to use a
        arch that there is
        > > a common class holds all the common properties, and the
        real classes are
        > > inherited from the common.
        > > But how to achieve that?
        > >
        > > thanks!
        > >
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