Re: [Springframework-developer] List merge enhancement request

[Lachezar D. <l.d...@gm...>]

  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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