RFR: 8169631: [JAXP] XALAN: transformation of XML via namespace-unaware SAX input yields a different result than namespace-unaware DOM input

[Joe Wang]

Hi Christoph,

Not all tests have finished yet, but there's at least one failure in the 
smoke test. I'll get to the details when I have time.

Any reason why m_prefixMappings can not be replaced with ArrayList?

Thanks,
Joe

On 11/14/16, 6:10 AM, Langer, Christoph wrote:
> Hi,
>
> please review this fix for bug 8169631.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8169631
> Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8169631.0/
>
> When XALAN is handling namespace unaware input, it behaves differently while using SAX input compared to DOM input.
>
> With both input source types, the class com.sun.org.apache.xml.internal.dtm.ref.sax2dtm.SAX2DTM2 converts SAX input into a DTM representation for processing by the XALAN transformer. Its method startElement takes URI, localname and qName as attribute. In case of missing feature namespaces, startElement and localname can be empty. However, the function uses the localname value for the call to m_expandedNameTable.getExpandedTypeID() and further processing. In the case where only qName has data, this leads to issues.
>
> When using DOM input, the class com.sun.org.apache.xalan.internal.xsltc.trax.DOM2SAX converts the DOM input into SAX input. In the case of empty localname, it fills localname with qname data. See method getLocalName() [1], called by parse() [2].
> When directly using SAX input, the SAX parser calls the startElement() function on XALAN's handler with empty uri and localname - which seems correct, as per the spec.
>
> Both paths end up in SAX2DTM2's startElement(). So I suggest to change this method to handle the case when uri and localname are empty and then set qname as localname. Maybe one should even change DOM2SAX's getLocalName handling to not fill localname with qname in case it is empty after SAX2DTM was changed..
>
> Generally, JavaDoc for SAXSource says that "Attempting to transform an input source that is not generated with a namespace-aware parser may result in errors." But why not fix some of these :)
>
> Furthermore I did some cleanups in the code.
>
> Thanks and best regards
> Christoph
>
> [1] http://hg.openjdk.java.net/jdk9/dev/jaxp/file/71558b38bad7/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/trax/DOM2SAX.java#l139
> [2] http://hg.openjdk.java.net/jdk9/dev/jaxp/file/71558b38bad7/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/trax/DOM2SAX.java#l279
> [3] https://docs.oracle.com/javase/8/docs/api/javax/xml/transform/sax/SAXSource.html
>
>