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From "James Carman" <ja...@carmanconsulting.com>
Subject Re: Default value for symbol
Date Wed, 17 Oct 2007 13:08:59 GMT
I see what you mean, but the way the situation should be handled would
be with a factory default.

On 10/17/07, Davor Hrg <hrgdavor@gmail.com> wrote:
> I understood that another symbol source is used...
>
> quote:
> >To fill this symbol with data at runtime, there is a properties file
> >(myProps.properties)
> >my.new.symbol=The value
>
> and that value contributed to ApplicationDefaults was not overriden
> with one from that source.
>
> Davor Hrg
>
>
> On 10/17/07, James Carman <james@carmanconsulting.com> wrote:
> > Actually, you don't need to define your own source.  You need to
> > provide a factory default.  Then, if that needs to be overridden, it
> > would be overridden with an application default.
> >
> > On 10/17/07, Davor Hrg < hrgdavor@gmail.com> wrote:
> > > contributing to ApplicationDefaults is the way to go,
> > > you just need to make sure your symbolSource is called before
> > > ApplicationDefaults
> > >
> > > for example
> > > look at :
> > >
> http://hivemind.apache.org/hivemind1/hivedocs/config/hivemind.SymbolSources.html
> > >
> > >  <source before="hivemind.FactoryDefaults"
> > > name="hivemind.ApplicationDefaults"
> > > service-id="ApplicationDefaultsSymbolSource" />
> > >  <source name=" hivemind.FactoryDefaults"
> > > service-id="FactoryDefaultsSymbolSource" />
> > >
> > >
> > > add your symbol source like this
> > >  <source before="hivemind.ApplicationDefaults" name="MySource"
> > > service-id="MySymbolSource" />
> > >
> > >
> > > Hrg
> > >
> > >
> > > On 10/17/07, locutuz
> <Sebastian.Klein@vector-informatik.de >
> > > wrote:
> > > >
> > > > Hi everyone,
> > > >
> > > > I have a contribution where an attribute is defined with a symbol, see
> > > > below:
> > > >
> > > > <config myNewAttribute="${ my.new.symbol}" ...
> > > >
> > > >
> > > > To fill this symbol with data at runtime, there is a properties file
> > > > (myProps.properties)
> > > > my.new.symbol=The value
> > > >
> > > > So far this works fine.
> > > > But there are some cases, where this properties file doesn´t exist
> > > already,
> > > > so at runtime an error message appears, telling me that there is no
> value
> > > > for that symbol
> > > > ( org.apache.hivemind.impl.SymbolExpander    : Error
> > > > at...META-INF/hivemodule.xml, line 146, column 7: No value available
> for
> > > > symbol 'my.new.symbol'.).
> > > >
> > > > Off course not, because the properties file doesn´t exist where the
> value
> > > is
> > > > get from.
> > > > My question is, if there is a possibility to set a default-value for a
> > > > symbol, if it can´t be expanded by the SymbolExpander?
> > > >
> > > > I tried to set the value with the <default> element.
> > > >       <contribution configuration-id="hivemind.ApplicationDefaults">
> > > >                 <default symbol=" my.new.symbol" value="DEFAULT" />
> > > >         </contribution>
> > > >
> > > > The problem here is, that at runtime the value for 'myNewAttribute' is
> > > > 'DEFAULT' in any case, regardless if the value can be read from the
> > > > properties file. i.e. if the symbol should be expanded by the
> > > > SymbolExpander.
> > > >
> > > > Thanks for your help in advance!
> > > >
> > > > Regards,
> > > > Sebastian
> > > >
> > > > --
> > > > View this message in context:
> > >
> http://www.nabble.com/Default-value-for-symbol-tf4639273.html#a13250295
> > > > Sent from the Hivemind - User mailing list archive at Nabble.com.
> > > >
> > > >
> > >
> > >
> >
>
>

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