Schmitz, Jeffrey A napisał(a):
OK (you asked for it), basically I have some xml that needs to be massaged
first by a simple xslt before being fed into my transformer, and then once my
transformer is done, I need to result to be massaged again with another xslt.
My transformer relies on some predefined and specific transformer libraries
that I have no control over, so the xml has to be massaged to fit into the
format required by these libraries. If I can just build a string with the
incoming xml (from the first xslt), I can then feed this string of xml into the
custom transform libraries (as long as the xml contained in the string is
structured correctly). So basically, here is what I need my custom tranformer
to do:
1. Accept SAX events and build a string of the incoming xml
2. Perform transform on the received xml string
3. Output the resulting xml in the form of more Sax events for the next
tranformer/serializer in line. i.e. something like this:
String message = doMyCustomTransform(incomingXMLString);
//Create a reader for turning a string into an InputSource
XMLReader xmlreader = XMLReaderFactory.createXMLReader();
//Set the content handler into the XMLReader class.
xmlreader.setContentHandler(contentHandler);
//Now feed the source into the xml reader, which will turn around and
//invoke the proper handlers in the contentHandler based on the
//string.
InputSource source = new InputSource(new StringReader(message));
xmlreader.parse(source);
I think it's overkill to use reader here. You should use
StringXMLizable[1] instead. Basically you have to do this:
extend AbstractTransformer and in setup() remember it's current value of
xmlConsumer and replace by instance of SaxBuffer[2].
SaxBuffer will record all events and you can serialize them into String.
Do your transformations and create StringXMLizable instance and call
toSAX method with original xmlConsumer as parameter.
You should do this in overloaded endDocument() methods but do not forget
to call super method otherwise your SaxBuffer would be incomplete.
Hope that helps.
I've pretty much got steps 2 and 3 worked out. I just need the step 1 part.
Need anymore details?
No. I really like answering this kind of questions: precise, showing
preparation and effort involved before asking for anything.
[1]
http://cocoon.apache.org/2.1/apidocs/org/apache/cocoon/xml/StringXMLizable.html
[2]
http://cocoon.apache.org/2.1/apidocs/org/apache/cocoon/xml/SaxBuffer.html
--
Grzegorz Kossakowski
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