Re: [Springframework-developer] List merge enhancement request

[Solomon D. <sd...@gm...>]

Ok.. you convinced me :)

On 5/22/07, Lachezar Dobrev <l.d...@gm...> wrote:
>   Actually this might prove very useful.
>   I have missed this new feature...
>   For instance the AOP interceptors quite often need to have a specific
> ordering. For now my implementation is so:
>
> <bean name="baseService" ...>
>  <property name="interceptors">
>   <list>
>    <value>transactionInterceptor</value>
>    <value>hibernateInterceptor</value>
>   </list>
>  </property>
> </bean>
>
> <bean name="someService" parent="baseService">
>  <property name="interceptors">
>    <list>
>     <value>validationInterceptor</value>
>     <value>transactionInterceptor</value>
>     <value>hibernateInterceptor</value>
>    </list>
>   </property>
>  </bean>
>
>  So I rewrite the whole list to prepend an item.
>
>  It would possibly prove useful to have:
> ...
>  <list merge="prepend">
>   <value>transactionInterceptor</value>
>  </list>
> ...
>
>   And this would be also backward-compatible (true, prepend or append).
>
>   Your style is viable (no doubt about that), but I think is more tedious,
> and I have trouble understanding it.
>
> 2007/5/22, Solomon Duskis < sd...@gm...>:
> >
> > The current "merge" functionality is slick because it is easy to use.
> > More functionality may end up making the merge functionality harder to
> > understand.
> >
> > I needed something more powerful as well.  I wrote my own
> > ListFactoryBean that is as configurable as you'd like.  You can see
> > what I did at
> http://jroller.com/page/Solomon?entry=appending_lists_in_spring_xml
> >
> > Basically, you'll need to break out the parent & child lists into
> > separate configurations and the use a "ref" instead of a nested
> > <list>.
> >
> > For example instead of doing:
> >
> > ... parent
> >   <property name="myList">
> >      <list>
> >         <value>3</value>
> >         <value>4</value>
> >      </list>
> >   </property>
> >
> >   ... child
> >   <property name="myList" merge="true">
> >      <list>
> >         <value>1</value>
> >         <value>2</value>
> >      </list>
> >   </property>
> >
> > You would do the following instead:
> >
> > ... parent
> >   <property name="myList" ref="parent_list">
> > </bean>
> >
> > <util:list name="parent_list">
> >      <list>
> >         <value>3</value>
> >         <value>4</value>
> >      </list>
> > </util:list>
> >
> > <bean class="...MyListFactoryBean" name="child_list">
> >     <property name="list">
> >      <list>
> >         <value>1</value>
> >         <value>2</value>
> >         <ref local="parent_list">
> >      </list>
> >      </property>
> > </util:list>
> >
> > ... child
> >   <property name="myList" ref="child_list">
> >
> > I hope that this helps...
> >
> > -Solomon
> >
> > On 5/22/07, Rob Butler < cro...@ya...> wrote:
> > > Hello all,
> > >
> > > In Spring 2.0 the capability to merge parent & child lists was added.
> This is a great feature, but unfortunately the current implementation will
> always place elements in the parent list before elements in the child list.
> It would be nice if an additional parameter could be added to control
> whether the parent or child list elements are first in the merged list.  In
> an application I am currently developing merged lists would have been ideal,
> but I need the child elements to come first so the current implementation
> cannot be used.
> > >
> > > Thanks
> > > Rob
> > >
> > >
> > >
> > >
> > >
> > >
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