[betwixt] Nested Mixed Content Lists

[Matt Kendall <ma...@iname.com>]

OK, so I have a really stupid question, but I've been banging my head
against it all day, so it's time to ask for some help. I have two
mixed content lists, one is a list of Matcher objects and each Matcher
list contains a list of Selector objects. Both Matcher and Selector
are abstract types. Matchers are contained in a Transform object. The
whole thing would look something like this:

public class Transform {
	private List<Matcher> matchers = new ArrayList<Matcher>();
	public void addMatcher(Matcher matcher) {
		matchers.add(matcher);
	}
	public List<Matcher> getMatchers() {
		return matchers;
	}
}

public abstract class Matcher {
	private List<Selector> selectors = new ArrayList<Selector>();

	protected abstract Set<Long> doSomething();

	public void addSelector(Selector selector) {
		selectors.add(selector);
	}

	public List<Selector> getSelectors() {
		return selectors;
	}
}

public abstract class Selector {
  public abstract void doSomething();
}

Now, reading the documentation, I found this little gem:

Transformer.betwixt
<info>
  <element name="transform">
    <element name="matchers">
      <element property="matchers" adder="addMatcher"/>
    </element>
    <addDefaults add-adders="false"/>
  </element>
</info>

And, naively, I also created:

AnInstanceOfMatcher.betwixt
<info>
  <element name="matcher">
    <element name="selectors">
      <element property="selectors" adder="addSelector"/>
    </element>
    <addDefaults add-adders="false"/>
  </element>
</info>

Using the latest betwixt 0.8 release this does not, sadly, give me
what I want. Just guessing, it looks like the name="matcher" attribute
from my AnInstanceOfMatcher.betwixt overrides the Transform.betwixt's
naming instructions. Here's my output:

<transform id="3">
  <matchers>
    <matcher id="4">
      <selectors>
	<PathFieldSelector id="5">
	  <path>table.*</path>
	</PathFieldSelector>
	<NamedFieldSelector id="6">
	  <name>table</name>
	</NamedFieldSelector>
      </selectors>
      <clazzName>java.util.HashMap</clazzName>
    </matcher>
  </matchers>
  <name>default</name>
</transform>

As you can see, the Selectors are named properly, but the type of the
Matcher remains a mystery. What is the proper way to map this?

Please note that I would prefer a strategy that doesn't require a lot
of extra attributes and elements. Once I get the actual mapping
working, I'll be toning down the complexity of the file so that it can
be easily edited by hand.

Thanks!
Matt

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Re: [betwixt] Nested Mixed Content Lists

[Matt Kendall <ma...@iname.com>]

As usual, a new day, a new Mt. Dew, and a re-read of the documentation
fixed my problem. What I actually needed was a betwixt-config file as
described in the derived beans mixed collection example.

Matt

On 5/22/07, Matt Kendall <ma...@iname.com> wrote:
> OK, so I have a really stupid question, but I've been banging my head
> against it all day, so it's time to ask for some help. I have two
> mixed content lists, one is a list of Matcher objects and each Matcher
> list contains a list of Selector objects. Both Matcher and Selector
> are abstract types. Matchers are contained in a Transform object. The
> whole thing would look something like this:
>
> public class Transform {
>         private List<Matcher> matchers = new ArrayList<Matcher>();
>         public void addMatcher(Matcher matcher) {
>                 matchers.add(matcher);
>         }
>         public List<Matcher> getMatchers() {
>                 return matchers;
>         }
> }
>
> public abstract class Matcher {
>         private List<Selector> selectors = new ArrayList<Selector>();
>
>         protected abstract Set<Long> doSomething();
>
>         public void addSelector(Selector selector) {
>                 selectors.add(selector);
>         }
>
>         public List<Selector> getSelectors() {
>                 return selectors;
>         }
> }
>
> public abstract class Selector {
>   public abstract void doSomething();
> }
>
> Now, reading the documentation, I found this little gem:
>
> Transformer.betwixt
> <info>
>   <element name="transform">
>     <element name="matchers">
>       <element property="matchers" adder="addMatcher"/>
>     </element>
>     <addDefaults add-adders="false"/>
>   </element>
> </info>
>
> And, naively, I also created:
>
> AnInstanceOfMatcher.betwixt
> <info>
>   <element name="matcher">
>     <element name="selectors">
>       <element property="selectors" adder="addSelector"/>
>     </element>
>     <addDefaults add-adders="false"/>
>   </element>
> </info>
>
> Using the latest betwixt 0.8 release this does not, sadly, give me
> what I want. Just guessing, it looks like the name="matcher" attribute
> from my AnInstanceOfMatcher.betwixt overrides the Transform.betwixt's
> naming instructions. Here's my output:
>
> <transform id="3">
>   <matchers>
>     <matcher id="4">
>       <selectors>
>         <PathFieldSelector id="5">
>           <path>table.*</path>
>         </PathFieldSelector>
>         <NamedFieldSelector id="6">
>           <name>table</name>
>         </NamedFieldSelector>
>       </selectors>
>       <clazzName>java.util.HashMap</clazzName>
>     </matcher>
>   </matchers>
>   <name>default</name>
> </transform>
>
> As you can see, the Selectors are named properly, but the type of the
> Matcher remains a mystery. What is the proper way to map this?
>
> Please note that I would prefer a strategy that doesn't require a lot
> of extra attributes and elements. Once I get the actual mapping
> working, I'll be toning down the complexity of the file so that it can
> be easily edited by hand.
>
> Thanks!
> Matt
>

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