4 Replies Latest reply on Mar 18, 2005 5:58 PM by aloubyansky

    Reusing xml element definitions/bindings

    adrian.brock Mar 16, 2005 5:52 PM

      Is there a way in the MetadataDrivenObjectModelFactory to
      reuse element bindings?

      e.g. In dtd terms I have something like:

      <!ELEMENT property (#PCDATA | value-type)>
<!ELEMENT parameter (#PCDATA | value-type)>

<!ELEMENT value (#PCDATA)>
<!ELEMENT value-type (dependency | collecton | list | set | array | map )>

<!ELEMENT collection (value-type*, value*)>
etc.


      But value and value-type are not real artificats in my javabean model
      they represent the same property with the same semantics on different javabeans.

      I can't see a way to define this type of reusable element binding
      that can be mapped onto multiple element bindings?
      I couldn't see how to do this?

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        • 1. Re: Reusing xml element definitions/bindings
          adrian.brock Mar 16, 2005 6:00 PM (in response to adrian.brock)

          Just to make it more concrete, I'm looking to parse something like:

          <property name="whatever">
 <collection>
 <value>SomeValue</value>
 <list>
 <dependency value="xxx"/>
 </list>
 </collection>
</property>

into
<property>
PropertyMetaData pmd = new PropertyMetaData();
 <collection>
CollectionMetaData cmd = new CollectionMetaData();
 <value>SomeValue</value>
StringValueMetaData smd = new StringValueMetaData();
smd.setValue("SomeValue");
cmd.add(smd);
 <list>
ListValueMetaData lmd = new ListValueMetaData();
 <dependency value="xxx"/>
DependencyValueMetaData dvmd = new DependencyValueMetaData();
dvmd.setValue("xxx");
lmd.add(dvmd);
cmd.add(lmd);
pmd.setValue(cmd);


          but property could easily be replaced with parameter/ParameterMetaData
          that needs to do the exactly same thing on its setValue().

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          • 2. Re: Reusing xml element definitions/bindings
            aloubyansky
            aloubyansky Mar 17, 2005 8:56 AM (in response to adrian.brock)

            Ok, it seems like I am going to disappoint you.

            Being a Junior Scientist, I have been doing a lot of research trying to come up with the best unmarshalling metadata/handling model based on your XML snippets and requirements for customizing bindings from different sources including inheritance of bindings from parent binding sources. As a result, I now have three prototypes:

            1) org.jboss.xml.binding.metadata.unmarshalling

            You are using this one. You are right, there is no notion of a type here.

            2) org.jboss.xml.binding.metadata

            This one does have a notion of a type. Different elements can use the same type. It was hard to support nested maps in this model and I found other limitations. So, I came up with the third one.

            3) org.jboss.xml.binding.sunday.unmarshalling

            This is the model I currently believe in since with this API all your (XML/Java binding) requirements I know of seem to be met.
            There is a testcase for the XML snippet from you using this api in

            package org.jboss.test.xml;
public class MiscUnitTestCase
 public void testConfigWithSunday() throws Exception


            This is very verbose. It doesn't use defualt binding rules yet (I am working on it right now), i.e. it requires manual binding for each element/attribute/text_content.
            As a prototype, it is under active development.

            I am sorry for making you learn new API each time. The last one should be sufficient in features for you. Let's get the first binding of your xml done (maybe not in a convenient way) and then let me maintain that part.

            I am looking at your testcases. I could convert them to use the new API.

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            • 3. Re: Reusing xml element definitions/bindings
              aloubyansky
              aloubyansky Mar 17, 2005 11:37 AM (in response to adrian.brock)

              Moved last API testcases to thier own unit testcase

              package org.jboss.test.xml;
public class SundayUnitTestCase


              Also added first runtime binding testcase (testRtBook) with selective binding customizations.

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              • 4. Re: Reusing xml element definitions/bindings
                aloubyansky
                aloubyansky Mar 18, 2005 5:58 PM (in response to adrian.brock)

                 

                package org.jboss.test.xml;
public class SundayUnitTestCase
 public void testKernel() throws Exception


                Contains binding for kernel's XML schema based on what I have seen in the XMLKernelDeployer and XML test files.
                The method is in comments since kernel's classes are not in the testsuite classpath.
                Also, I have just typed it, not actually tested. This is very verbose and doesn't reuse handlers though there are places were it could.

                Adrian, do you want me to complete this for you?

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