Re: [Springframework-developer] List merge enhancement request

[Solomon D. <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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