I just compared some XML-Binding frameworks like JAXB, Castor, XMLBeans, JiBX etc. The one I most liked was Betwixt. It is very easy to use, produces SAX events, it works with EJBs RemoteInterface, easy to use mapping files, clean XML, supports Maps and Collection in a way I like it. And it is more Beans-centric, good if you want to use your existing beans (Castor is more Schema-centric, I think).

But there is no BetwixtTransformer with cocoon, so I wrote one that is very analoge to the CastorTransformer. It works also with EJBs.

Some links:

How it works

from the javadoc

Betwixt transformer marshals an object from the Sitemap, Session, Request or the Context into a series of SAX events.
Configuation: The betwixt transformer can be configured to not output

<map:transformer name="betwixt" src="org.apache.cocoon.transformation.BetwixtTransformer">
  <ref-ids>true</ref-ids>
</map:transformer>

BR

Sample:

<root xmlns:betwixt="http://apache.org/cocoon/betwixt/1.0">
  <betwixt:include name="invoice"/>
  <betwixt:include name="product" scope="sitemap"/>
  <betwixt:include name="product2" element="other-product"/>
</root>

The BetwixtTransfomer support only one Element betwixt:include. This element is replaced with the marshalled object. The Object given through the attribute name will be searched in the request, session, context and at least in sitemap. If the scope is explicitly given, the object will ge located only there. The attribute element can be given to specify an alternative root element for the object. Collections are marshalled by marshalling each object it contains.

How to use

make sure you have the following files in your classpath (or newer version) Commons: BIN || SOURCE:

put the following in your sitemap:

<!-- under map:tranformers -->
  <map:transformer name="betwixt" src="org.apache.cocoon.transformation.BetwixtTransformer"/>

<!-- In your pipeline -->
<map:match pattern="test-betwixt.xml">
  <map:generate type="serverpages" src="test-betwixt.xsp"/>

  <map:transform type="betwixt"/>
  <!--<map:transform type="xslt" src="sometemplate.xsl"/>-->
  <map:serialize type="xml"/>
</map:match>

and a file named test-betwixt.xsp:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
  <page>
    <xsp:logic>
      <!-- Add something to Request, that should be written as XML -->
      java.util.Map testBean = new java.util.Hashtable();
      testBean.put("entry1", "String1");
      testBean.put("entry2", new Integer(22));
      request.setAttribute("testB", testBean);
    </xsp:logic>
    <example xmlns:betwixt="http://apache.org/cocoon/betwixt/1.0">
      <betwixt:include name="testB" scope="request"/>
    </example>
  </page>
</xsp:page>

The output should somehow like:

<page>
  <example>
    <testB>
      <entry><key>entry1</key><value>String1</value></entry>
      <entry><key>entry2</key><value>22</value></entry>
    </testB>
  </example>
</page>



Attachment: BetwixtTransformer.java

BetwixtTransformer (last edited 2009-09-20 23:40:37 by localhost)