XOM API for Processing XML with Java

[Thomas LEDUC <thomas.leduc AT cerma.archi.fr>]

Michael Kay a écrit :
> The fact that it's a ParsingException is a pretty good clue that there's 
> something wrong with the XML, and the fact that it's on line
>
> MyXomTest.java:39
>
> [...]
> which should be
>
> <?xml version='1.0'?>
>   
Many thanks Michael, yes indeed, it was a syntax error.

Contrarily to what I wrote yesterday, I'm unable to process recursive
X-include. I've modified a bit the use case I sent so as to attest it
(see the independent class below). Here is the crash trace:

[Fatal Error] engine:1:1: Recursive include detected.  Document
'file:///home/leduc/solenetb/trunk/platform/engine' was already processed.
[Fatal Error] engine:1:115: Error attempting to parse XML file
(href='lvl_2.xml').
[Fatal Error] :1:99: Error attempting to parse XML file (href='lvl_1.xml').
Exception in thread "main" nu.xom.ParsingException: Error attempting to
parse XML file (href='lvl_1.xml'). at line 1, column 99
    at nu.xom.Builder.build(Unknown Source)
    at nu.xom.Builder.build(Unknown Source)
    at org.solenetb.engine.MyXomTest.main(MyXomTest.java:49)
Caused by: org.xml.sax.SAXParseException: Error attempting to parse XML
file (href='lvl_1.xml').
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
    ... 3 more

And the class content:

import java.io.*;

import javax.xml.parsers.SAXParserFactory;
import nu.xom.*;
import nu.xom.xinclude.XIncluder;
import nu.xom.xslt.XSLTransform;
import org.xml.sax.*;

public class MyXomTest {
    private static final String XML1 = "<?xml version='1.0'?><aa
xmlns:xi='http://www.w3.org/2001/XInclude'><xi:include
href='lvl_1.xml'/><dd/></aa>";
    private static final String XML2 = "<?xml version='1.0'?><bb
xmlns:xi='http://www.w3.org/2001/XInclude'><cc name='foo'/><xi:include
href='lvl_2.xml'/></bb>";
    private static final String XML3 = "<?xml version='1.0'?><bb><cc
name='foo'/></bb>";
    private static final String XSLT_IDENTITY = "<?xml version='1.0'?>"
            + "<xsl:stylesheet version='1.0'
xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\";>"
            + "<xsl:template match='node()|@*'>" + "<xsl:copy>"
            + "<xsl:apply-templates select='@*|node()'/>" + "</xsl:copy>"
            + "</xsl:template>" + "</xsl:stylesheet>";

    public static class MyEntityResolver implements EntityResolver {
        @Override
        public InputSource resolveEntity(String publicId, String systemId)
                throws SAXException, IOException {
            InputStream inputStream = null;
            if (systemId.endsWith("lvl_1.xml")) {
                inputStream = new ByteArrayInputStream(XML2.getBytes());
            } else if (systemId.endsWith("lvl_2.xml")) {
                inputStream = new ByteArrayInputStream(XML3.getBytes());
            }
            if (null == inputStream) {
                return null;
            }
            InputSource inputSource = new InputSource(inputStream);
            inputSource.setSystemId(AConsoleCommand.USER_DIR);
            return inputSource;
        }
    }

    public static void main(String[] args) throws Exception {
        SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
        saxParserFactory.setNamespaceAware(true);
        saxParserFactory.setXIncludeAware(true);
        XMLReader x = saxParserFactory.newSAXParser().getXMLReader();
        x.setEntityResolver(new MyEntityResolver());

        Builder builder = new Builder(x);
        Document input = builder
                .build(new ByteArrayInputStream(XML1.getBytes()));
        Document intermed_result = XIncluder.resolve(input, builder);
        Document stylesheet = builder.build(new ByteArrayInputStream(
                XSLT_IDENTITY.getBytes()));
        XSLTransform transform = new XSLTransform(stylesheet);
        Nodes output = transform.transform(intermed_result);
        Document result = XSLTransform.toDocument(output);
        System.out.println(result.toXML());
    }
}