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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 11962] New: - DigesterTransformer donation
Date Fri, 23 Aug 2002 09:28:51 GMT
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG 
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=11962

DigesterTransformer donation

           Summary: DigesterTransformer donation
           Product: Cocoon 2
           Version: Current CVS
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: sitemap components
        AssignedTo: cocoon-dev@xml.apache.org
        ReportedBy: m.homeijer@devote.nl


See also "http://jakarta.apache.org/commons/digester.html"

----------- Overview --------------------
With the digester transformer it is possible to convert XML to Java classes. 
This does not apply only to data, but also applies to classes that perform 
functionality while they
are created and their methods are called by the digester. By using "factory-
create-rule" possibilities from the digester it is even possible to update
and existing java class structure instead of only creating new java structures.

Our primary use for it is to create a clean connection/seperation from a Cocoon 
front-end and an EJB back-end.

--------- Configuration ------------------
To use the DigesterTransformer in Cocoon, the jakarta commons digester has to 
be available in Cocoon (including the jars the digester depends upon).

Declaration of the transformer component:
<map:transformer logger="sitemap.transformer.digester" name="digester" 
src="org.apache.cocoon.transformation.DigesterTransformer"/>


<map:generate src="data.xml"/>
<map:transform type="digester" src="digester.xml"> 
	<map:parameter name="precommand" 
value="....... .transformation.helper.PrepareDigester"/>
	<map:parameter name="postcommand" 
value="...... .transformation.helper.ProcessDigesterResult"/>
</map:transform>
The input for the transformer is XML data that must be transformed into java 
classes.
The src attribute for the transformer specifies the xml rule input for the 
digester.
The values specified in precommand and postcommand are classes that must 
implement
org.apache.cocoon.transformation.helper.DigesterCommand

--------- Note ---------------
For now the transformer just outputs the input xml data. Additional data can be 
output in the sax stream with the use of the precommand and postcommand
specification.

Enjoy..

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