Yes, that's what I'm saying. Typically, "framework" authors will use
factory defaults if there are reasonable defaults for their symbols.
Then, individual applications that use that framework are free to
override those symbols using application defaults. For example, in my
HiveMind/Acegi library, I set a factory default to say that the
affirmative-based decision manager should be used by default:
<contribution configuration-id="hivemind.FactoryDefaults">
<default symbol="hivemind.acegi.decisionManagerClass"
value="org.acegisecurity.vote.AffirmativeBased"/>
</contribution>
However, any other application can override that by doing:
<contribution configuration-id="hivemind.ApplicationDefaults">
<default symbol="hivemind.acegi.decisionManagerClass"
value="someOtherDecisionManagerClass" />
</contribution>
On 10/17/07, Johan Maasing <[EMAIL PROTECTED]> wrote:
> As both Davor and james said, chain needs to be set up correctly so that
> propertiesfile->appdefaults->factorydefaults
> This is done with before and after attributes.
>
> But I guess what James is saying is that the default value should
> belong in factory-defaults since you might want to override it in an
> application default even if the properties-file does not exists. Is
> that correct?
>
>
> On 10/17/07, James Carman <[EMAIL PROTECTED]> wrote:
> > 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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 < [EMAIL PROTECTED]> 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
> > > <[EMAIL PROTECTED] >
> > > > > 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.
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
>
