[Xdoclet-devel] match variable Problem

[Matthias Germann]

Dear XDoclet developers,
I'm trying to create a patch for an additional feature in the IBM 
WebSphere module.

IBM Websphere offers the possibility to specify additional properties 
for a Resource-Reference in a proprietary deployment descriptor (i.e. 
the transaction isolation level).

I thought that i could add a "websphere.resource-ref" Tag for the 
additional WebSphere proprietary parameters. As a bean may declare 
multiple Resource-References, the tags could look like this:

/*
 * @ejb.resource-ref
 *   res-ref-name="DS1"
 * @websphere.resource-ref
 *   res-ref-name="DS1"
 *   transaction-isolation="TRANSACTION_READ_COMMITTED"
 *
 * @ejb.resource-ref
 *  res-ref-name="DS2"
 * @websphere.resource-ref
 *   res-ref-name="DS2"
 *   transaction-isolation="TRANSACTION_READ_UNCOMMITTED"
 */
The generated deployment descriptors for this example should look 
similar to the snippets below. It's important to notice that the 
Elements in the WebSphere proprietary descriptors are links to the 
Elements in the ejb-jar.xml with the ID attribute and not with the 
res-ref-name.

ejb-jar.xml:
<resource-ref id="ResRef_12>
  <res-ref-name>DS1<res-ref-name>
  ...
</resource-ref>
<resource-ref id="ResRef_13>
  <res-ref-name>DS2<res-ref-name>
  ...
</resource-ref>
WebSphere proprietary descriptor (names may be wrong) :
<resource-ref-ext>
  <resource-ref href="ejb-jar.xml#ResRef_12"/>
  <transactionIsolation>TRANSACTION_READ_COMMITTED</transactionIsolation>
</resource-ref-ext>
<resource-ref-ext>
  <resource-ref href="ejb-jar.xml#ResRef_12"/>
  <transactionIsolation>TRANSACTION_READ_COMMITTED</transactionIsolation>
</resource-ref-ext>
I thought, that i could loop through the "ejb.resource-ref" tags and 
create a <resource-ref-ext> element in the WebSphere DD for each 
ejb.resource-ref tag. If i use the same prefix for generating the id as 
the ejb Module, i should be able to get the correct ID for the href 
Attribute. If there is a "websphere.resource-ref" tag with the same 
"res-ref-name" parameter value as the "res-ref-name" of the current 
"ejb.resource-ref" tag, the values from this tag are inserted into the 
WebSphere DD element.

The essential part of my WebSphere DD Template looks like below. I try 
to use the match variable for storing the "res-ref-name".

<XDtClass:forAllClassTags tagName="ejb.resource-ref" >
<resource-ref-ext>
  <resource-ref href="ejb-jar.xml#<XDtId:prefixedId prefix='ResRef' 
wrapInIdEquals='false'/>"/>
<XDtClass:classTagValueMatch tagName="ejb.resource-ref" 
paramName="res-ref-name"/>
<XDtClass:forAllClassTags tagName="websphere.resource-ref" >
<XDtClass:ifClassTagValueMatches tagName="websphere.resource-ref" 
paramName="res-ref-name">
<XDtClass:ifHasClassTag tagName="websphere.resource-ref" 
paramName="transaction-isolation">
...

This does not work because the forAllClassTags resets the value of the 
match variable (see method forAllClassTags in class 
xdoclet.tagshandler.ClassTagsHandler). Therefore, a 
"transaction-isolation" element is never created.

Is there a better approach than mine?
Is it the right approach to use the match variable for saving the value 
of the "res-ref-name"?

Why does the ClassTagsHandler reset the value of the match variable in 
the forAllClassTags method?

I found similar code in the jboss module 
(modules/jboss/src/xdoclet/modules/jboss/jmx/resources/jbossmx-xml-descriptor.xdt) 

I have not tested the code, but i think that it does not work because it 
uses the same pattern as i try to use.

Thanks for your help.
Regards,
Matthias



--
Matthias Germann <[EMAIL PROTECTED]>
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