[izpack-devel] Implementation for conditions in izpack

[Dennis Reil]

> I think conditions can be a good thing. Hope it do not 
> interfere with the stuff Fabrice has announced some time ago.

I don't really know, what he is doing right now. I thought, he's working
on showing multiple instances of a panel. 

> The right branch for it is trunk, not 3.9 I think. Do you agree?

Yes, that should go into the trunk.

> I am enquiring about the implementation. 
> Hope it is baseline at IzPanel level and will therefore also work
> with custom panels without impl anything. 
> May be I can it also use (and impl) for custom actions.

Yes, the panelconditions will be checked at izpanel level, so every
custom panel will get this too.

The RulesEngine is instantiated in InstallerFrame and will be available
through a get method in InstallerFrame.
It's really easy to integrate condition availability in other locations.
As I mentioned, I already did it for the fields-elements in
UserinputPanel, so one can show/hide certain userinput fields on a
panel.

> Will be nice if a DTD exist in %IZ_HOME%\src\dtd. 
> Also an adapted docu :-)
> But first things first...

;-)


regards,
   Dennis

> 
> Cheers
> 
> Klaus
> 
> >-----Original Message-----
> >From: izpack-devel-bounces at lists.berlios.de
> >[mailto:izpack-devel-bounces at lists.berlios.de]On Behalf Of Dennis Reil
> >Sent: Thursday, November 09, 2006 8:49 AM
> >To: izpack-devel at lists.berlios.de
> >Subject: [izpack-devel] Implementation for conditions in izpack
> >
> >
> >Hi,
> >
> >As mentioned, some time ago, I implemented an extension which adds the
> >possibility of defining conditions for the izpack installer. These
> >conditions can be used e.g. to only show panels for which 
> >conditions are
> >met. Conditions can be currently defined based on pack selections,
> >variables and Java field values. The boolean conditions and, 
> >or, xor and
> >not are also possible to create more complex conditions.
> >
> >These conditions can be used to specify which panel are shown, which
> >packs can be installed and which variables should be set. I also
> >extended UserInputPanel so that conditions could be used to show fields
> >on a panel.
> >
> >Conditions are currently defined in a resource file. An example
> >conditions.xml could look like:
> >
> ><?xml version="1.0" ?>
> ><conditions>	
> >	<condition type="variable" id="notwarfilesetup">
> >		<name>izpack.setuptype</name>
> >		<value>standard</value>
> >	</condition>
> >        <condition type="packselection" id="demoprojectsselected">
> >                <packid>pack.demo.projects</packid>
> >        </condition>
> >        <panelcondition panelid="jvmpanel"  
> >                  conditionid="notwarfilesetup"/>
> >        <panelcondition panelid="projects.settings"
> >                  conditionid="demoprojectsselected" />
> >	<packcondition packid="pack.appserver.tomcat"
> >                 conditionid="notwarfilesetup" />
> ></conditions>
> >
> >This spec has two conditions, one based on a variable value
> >(notwarfilesetup) and one based on a pack selection. Based on this
> >conditions two panelconditions and one packcondition is defined. This
> >means, that jvmpanel is only shown if notwarfilesetup validates true
> >which means, that the variable with name izpack.setuptype has to be
> >standard. The pack (pack.appserver.tomcat) will only be available for
> >installation if condition notwarfilesetup validates true.
> >
> >
> >If you find this useful, I would create the appropriate patches to
> >integrate it in izpack. New types of conditions can easily be added by
> >subclassing an abstract condition base class. As the rules engine loads
> >conditions by reflections, a new type can easily be used in the spec
> >file.
> >For sure, there are many more places in izpack, where conditions can be
> >useful (e.g. pack definition, executables, parsables).
> >
> >
> >Do you find this useful?
> >
> >Regards 
> >   Dennis
> >
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> >