Re: [Springframework-developer] DefaultPropertyPlaceholderConfigurer

[Axel W. <axe...@go...>]

Ok, so that's how it works :-)

http://opensource.atlassian.com/projects/spring/browse/SPR-3001

2007/1/1, Stefan Kleineikenscheidt <st...@kl...>:
> Axel, imho this looks great.  Maybe you can also open an issue in
> Jira, so that everyone can vote for it.  :)
>
> Cheers,
> -Stefan
>
>
>
> On 12/28/06, Axel Wienberg <axe...@go...> wrote:
> > Hi all,
> > We're using the PropertyPlaceholderConfigurer quite a bit at work, and
> > I was thinking about ways to handle default values more elegantly.
> > When a property is not configured by a customer, usually some default
> > should be used.
> > The standard spring way seems to be to put a property map inside the
> > XML configuration file (as in
> > http://www.kleineikenscheidt.de/stefan/archives/2005/06/default-configuration-with-spring.html),
> > or to have two properties files, one with the defaults, and one for
> > customer customization.
> > However, that means some redundancy: Each placeholder is listed two or
> > three times, once in the list of defaults, once when it is assigned to
> > a bean property, and once when it is customized.
> > What I've come up with is this:
> >
> > <bean id="propertyConfigurer"
> >     class="net.wuenschenswert.spring.DefaultPropertyPlaceholderConfigurer">
> >   <property name="location" value="file:custom/my.properties"/>
> > </bean>
> >
> > <bean id="mybean">
> >   <property name="cachesize" value="${my.cache.size=100}"/>
> > </bean>
> >
> > If "my.properties" contains a value for my.cache.size, that value is
> > used, otherwise, the default "100" is assigned.  The idea is to have
> > the default value just where the placeholder and the bean property
> > are, using a syntax like ${placeholder=defaultvalue}.
> >
> > I would love to see this in the springframework proper, I'm just not
> > sure how to go about submitting it. If you're interested in the
> > source, please visit
> > http://www.wuenschenswert.net/wunschdenken/archives/107
> >
> > Regards,
> > Axel
> >
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