Re: [Springframework-developer] Q: Magic behind PropertyConfigurer

[Dmitriy K. <dko...@ru...>]

Alex,

to answer your first question - the "magic" behind PropertyConfigurer's Resource property conversion from String is done by org.springframework.core.io.ResourceEditor

Regards,
Dmitriy.


Alexi Polenur wrote:

> Hi all,
> 
> In Petclinic I see following in applicationContext.xml
> 
>    <bean id="propertyConfigurer" 
> class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
> 
>        <property 
> name="location"><value>/WEB-INF/jdbc.properties</value></property>
>    </bean>
> 
> The  location property in PropertyPlaceholderConfigurer is of type 
> Resource. The question is, how does Spring "knows" to take 
> /WEB-INF/jdbc.properties string and construct an instance wich 
> implements a Resource interface. How does it knows what implementation 
> of this interface to use?
> 
> The second part of my question is a "real question". What I would like 
> to do is to have PropertyConfigurer to setup different property set 
> based on context (system property).
> 
> The reason I need it is for moving code from one environment to another. 
> For example when I move my app. from development to production my DB is 
> changing so I would like my PropertyConfigurer to read different 
> property file based on some system property which identifies environment.
> 
> The way I am trying to do it is by creating a special subclass of a 
> Resource which uses a ResourceBundle instead of single property file. 
> Each locale in ResourceBundle represents an environment (dev, test, 
> prod). My context now looks like that:
> 
>     <bean id="resourceA" class="myresources.ContextualResource">
>    </bean>
>          <bean id="propertyConfigurer" 
> class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
> 
>        <property name="locations">
>                    <list>
>                        <ref local="resourceA"/>
>                    </list>
>                </property>
>    </bean>
> 
> Does it sound like a resonable approach? Has somebody done it before ? 
> Is it better way of doing this ?
> 
> Thanks, Alexi
> 
> 
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