On 11.06.2004 21:20, Jeff Potts wrote:
I am a new Cocoon developer and new to SAX. I have developed my first custom Transformer. The transformer works great when it is followed by an XML Serializer but it gets a runtime error when it is followed by an XSL Transformer.
My transformer queries a back-end system which returns XML. I want to simply replace the original query in my XML with the resulting XML from the back-end system (like the SQL Transformer does).
I think my problem is with the parser.parse call.
No, I don't think so, this makes it only obvious. Read below for my thinking.
When I just spit the XML into the output with characters() I get the XML but with entities instead of angle brackets and no runtime error.
You don't push XML then, but only a string. That's definitely not the way to go.
When I use the parser.parse call I get the runtime error.
You must have in mind that you are in an XML pipeline. When you call this method for each SAX event a method is called on this.xmlconsumer, which calls a method on its xmlconsumer, which calls a method on its xmlconsumer, which ... until the last xmlconsumer, the serializer, is reached. So it's probably not parser.parse itself where the error occurs, but "somewhere" in the pipeline.
I've saved a local copy of the XML from the back-end and have successfully transformed it with the same stylesheet, so the stylesheet is okay.
Any help is appreciated. Environment info, LogTransformer output, full RuntimeException, and Transformer code snipped are attached below.
Very good preparation for a help request ;-) Read on ...
LogTransformer output============================
[setup] ---------------------------- [Fri Jun 11
13:50:46 CDT 2004] ----------------------------
[setDocumentLocator]
systemid=file:/C:/apache/build/tomcat-4.1/webapps/cocoon/ddash/resources/sampledqlquery.xml,publicid=
[startDocument]
startDocument no. 1
[startElement] uri=,local=testquery,raw=testquery
[characters]
[startPrefixMapping]
prefix=xdql,uri=http://com.navigatorsystems.cocoon.dctm.xdql
[characters]
[characters]
[characters]
[startElement]
uri=http://com.somehost.cocoon.dctm.xdql,local=execute-query,raw=execute-query
[setDocumentLocator] systemid=null,publicid=null
[startDocument]
startDocument no. 2
[startElement] uri=,local=root,raw=root
[characters] [startElement] uri=,local=object,raw=object
[ ] 1.
uri=,local=ID,qname=ID,type=CDATA,value=09011f0880003245
[characters] [startElement] uri=,local=r_object_id,raw=r_object_id
[characters] 09011f0880003245
[endElement] uri=,local=r_object_id,raw=r_object_id
[characters] [startElement] uri=,local=object_name,raw=object_name
[characters] sub-food.gif
[endElement] uri=,local=object_name,raw=object_name
[characters] [endElement] uri=,local=object,raw=object
[characters] [startElement] uri=,local=object,raw=object
[ ] 1.
uri=,local=ID,qname=ID,type=CDATA,value=09011f0880003370
[characters] [startElement] uri=,local=r_object_id,raw=r_object_id
[characters] 09011f0880003370
[endElement] uri=,local=r_object_id,raw=r_object_id
[characters] [startElement] uri=,local=object_name,raw=object_name
[characters] sub-food.gif
[endElement] uri=,local=object_name,raw=object_name
[characters] [endElement] uri=,local=object,raw=object
[characters]
[endElement] uri=,local=root,raw=root
[endDocument]
endDocument no. 1
[endElement]
uri=http://com.somehost.cocoon.dctm.xdql,local=execute-query,raw=execute-query
[endPrefixMapping] prefix=xdql
[characters]
[endElement] uri=,local=testquery,raw=testquery [endDocument]
endDocument no. 2
Two problems I see: 1. duplicate startDocument end endDocument events 2. wrong prefix mapping
I guess problem 1 is causing the exception. And I also guess the output from setDocumentLocator immediately before startDocument no. 2 til endDocument no. 1 is the output of parser.parse, isn't it? You probably have to add another XML consumer into the pipeline that filters out the *Document events. Therefore add a class extending AbstractXMLPipe and overwriting startDocument and endDocument with empty body. Your code would then look like:
super.startElement(... params ...); MyPipe pipe = new MyPipe(this.xmlconsumer); parser.parse(source, pipe); super.endElement(... params ...);
class MyPipe extends AbstractXMLPipe {
MyPipe(XMLConsumer consumer) {
this.setConsumer(consumer);
}
startDocument() {}
endDocument() {}
}(Of course with the correct parameters and access modifiers.)
To problem 2: You mapped xdql to http://com.navigatorsystems.cocoon.dctm.xdql, but the element has uri=http://com.somehost.cocoon.dctm.xdql,local=execute-query,raw=execute-query. This means you have the appropriate to xmlns:xdql="http://com.navigatorsystems.cocoon.dctm.xdql"; in your pipe, but the element looks like <execute-query xmlns="http://com.somehost.cocoon.dctm.xdql";>. Besides that these are different uris the element should also be prefixed with xdql or the prefix mapping should be changed: mapping "" to uri=http://com.somehost.cocoon.dctm.xdql.
Hope this helps,
Joerg
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