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From "Andreas Veithen (JIRA)" <>
Subject [jira] [Created] (AXIOM-419) Multiple issues in OMDataSourceExtBase
Date Mon, 30 Apr 2012 10:38:48 GMT
Andreas Veithen created AXIOM-419:

             Summary: Multiple issues in OMDataSourceExtBase
                 Key: AXIOM-419
             Project: Axiom
          Issue Type: Bug
          Components: API
    Affects Versions: 1.2.13
            Reporter: Andreas Veithen
            Priority: Minor

OMDataSourceExtBase has multiple issues and we should probably deprecate it in favor of a
cleaner implementation:

(1) The default implementation of serialize(OutputStream, OMOutputFormat) relies on getXMLBytes:


This is probably the worst choice from a performance point of view.

(2) The default implementation of serialize(Writer, OMOutputFormat) is even worse:

            String text = new String(getXMLBytes(format.getCharSetEncoding()));

(3) serialize(XMLStreamWriter) tries to optimize the serialization by using serialize(OutputStream,
OMOutputFormat) if the XMLStreamWriter is a MTOMXMLStreamWriter, i.e. it attempts to bypass
the XMLStreamWriter. However, as noted in the Axiom 1.3 roadmap, this kind of optimization
is non trivial and the serialize(OutputStream, OMOutputFormat) is not well designed for this.
The issues that may arise can be demonstrated using the InputStreamDataSource (which extends

        OMFactory factory = OMAbstractFactory.getOMFactory();
        OMElement parent = factory.createOMElement("root", factory.createOMNamespace("urn:parent",
        OMSourcedElement child = factory.createOMElement(new InputStreamDataSource(new ByteArrayInputStream("<child/>".getBytes("utf-8")),
"utf-8"), new QName("child"));
//        child.getFirstOMChild();
        parent.serializeAndConsume(System.out, new OMOutputFormat());

The output of this code is:

<root xmlns="urn:parent"><child/></root>

This is incorrect because the namespace of the child element in the output is urn:parent while
the original element has no namespace. If the line forcing the expansion of the OMSourcedElement
is uncommented, then the result is correct:

<root xmlns="urn:parent"><child xmlns=""/></root>

(4) The class contains code (see the private reader2writer method) that copies events from
the XMLStreamReader produced by getReader() to an XMLStreamWriter. However, that code actually
fully builds an Axiom tree, which is the least optimal approach.

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