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[xsl] RE: URI Resolution for document('') Reference Is Broken?
Subject: [xsl] RE: URI Resolution for document('') Reference Is Broken? From: "Roger L. Cauvin" <roger@xxxxxxxxxx> Date: Wed, 6 Jan 2010 18:08:27 -0600 |
Michael, To what value should I set the system ID? The document('') resolution still fails if I set the SystemId to the directory of the stylesheet in the initial invocation: TransformerFactory transformerFactory = TransformerFactory.newInstance("net.sf.saxon.TransformerFactoryImpl", Thread.currentThread().getContextClassLoader()); //TransformerFactory transformerFactory = TransformerFactory.newInstance(); URIResolver uriResolver = new ServletContextURIResolver(context); transformerFactory.setURIResolver(uriResolver); InputStream xslInputStream = context.getResourceAsStream("/data/GetMonthLengths.xsl"); Source xslSource = new StreamSource(xslInputStream); String realPath = context.getRealPath("/data"); xslSource.setSystemId(realPath); Transformer transformer = transformerFactory.newTransformer(xslSource); transformer.setURIResolver(uriResolver); InputStream xmlStream = context.getResourceAsStream("/data/Months.xml"); Reader xmlReader = new InputStreamReader(xmlStream); Source xmlSource = new StreamSource(xmlReader); StringWriter outputWriter = new StringWriter(); Result output = new StreamResult(outputWriter); transformer.transform(xmlSource, output); outputWriter.flush(); It even fails if I also set the SystemID on the Source object returned by my URIResolver: public Source resolve( String href, String basePath) { Source source = null; System.out.println("href: " + href); System.out.println("basePath: " + basePath); if (href != null) { boolean isEmptyHRef = href.equals(""); if (!isEmptyHRef) { ServletContext servletContext = getServletContext(); InputStream inputStream = servletContext.getResourceAsStream(href); if (inputStream != null) { source = new StreamSource(inputStream); String realPath = servletContext.getRealPath("/data"); source.setSystemId(realPath); } } } System.out.println("source: " + source); return source; } The output is: href: /data/date.get-days-in-month.template.xsl basePath: file:///C:/Morandum/source/http/servlet/war/data source: javax.xml.transform.stream.StreamSource@c01e99 href: basePath: file:///C:/Morandum/source/http/servlet/war/data source: null Error on line 1 column 1 of data: SXXP0003: Error reported by XML parser: Content is not allowed in prolog. outputText: <month-lengths> Recoverable error <month-length/> FODC0002: org.xml.sax.SAXParseException: Content is not allowed in prolog. Recoverable error FODC0005: Document has been marked not available: file:///C:/Morandum/source/http/servlet/war/data <month-length/> Recoverable error <month-length/> FODC0005: Document has been marked not available: file:///C:/Morandum/source/http/servlet/war/data </month-lengths> Roger -----Original Message----- From: "Michael Kay" Sent: 1/6/2010 8:43:00 PM To: xsl-list@xxxx Subject: [xsl] URI Resolution for document('') Reference Is Broken? > > Thanks for the prompt response. Here is the servlet code that > sets up and invokes the transformation: > > Source xslSource = new StreamSource(xslInputStream); > Just as I guessed, you are not setting the systemID on the Source object. So its base URI is unknown. document('') retrieves the resource whose URI is the base URI of the element containing the call to document(''), which in this case is unknown. Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay -----Original Message----- From: Roger L. Cauvin [mailto:roger@xxxxxxxxxx] Sent: Wednesday, January 06, 2010 3:38 PM To: 'xsl-list@xxxxxxxxxxxxxxxxxxxxxx' Subject: RE: URI Resolution for document('') Reference Is Broken? Michael, Thanks for the prompt response. Here is the servlet code that sets up and invokes the transformation: public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { HttpSession session = request.getSession(); ServletContext context = session.getServletContext(); TransformerFactory transformerFactory = TransformerFactory.newInstance("net.sf.saxon.TransformerFactoryImpl", Thread.currentThread().getContextClassLoader()); //TransformerFactory transformerFactory = TransformerFactory.newInstance(); URIResolver uriResolver = new ServletContextURIResolver(context); transformerFactory.setURIResolver(uriResolver); InputStream xslInputStream = context.getResourceAsStream("/data/GetMonthLengths.xsl"); Source xslSource = new StreamSource(xslInputStream); Transformer transformer = transformerFactory.newTransformer(xslSource); transformer.setURIResolver(uriResolver); InputStream xmlStream = context.getResourceAsStream("/data/Months.xml"); Reader xmlReader = new InputStreamReader(xmlStream); Source xmlSource = new StreamSource(xmlReader); StringWriter outputWriter = new StringWriter(); Result output= new StreamResult(outputWriter); transformer.transform(xmlSource, output); outputWriter.flush(); String outputText = outputWriter.toString(); System.out.println("outputText: " + outputText); } catch (TransformerConfigurationException tce) { tce.printStackTrace(); throw new ServletException(tce); } catch (TransformerException te) { te.printStackTrace(); throw new ServletException(te); } } As you can see, I did not set the SystemID property. Do I need to do so? If so, to what should I set it? Roger -----Original Message----- From: "Michael Kay" Sent: 1/6/2010 8:43:00 PM To: xsl-list@xxxx Subject: [xsl] URI Resolution for document('') Reference Is Broken? It seems likely that the Base URI of the stylesheet isn't known, or has been supplied incorrectly. You don't show how you set it up. Generally it will be the SystemID property of the JAXP Source object containing the stylesheet. Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay -----Original Message----- From: Roger L. Cauvin [mailto:roger@xxxx] Sent: 06 January 2010 19:31 To: xsl-list@xxxx Subject: [xsl] URI Resolution for document('') Reference Is Broken? I have web application (servlet) that performs XSLT transformations and uses a URIResolver to help resolve paths. The web applications directory structure is as follows: war data META-INF WEB-INF The 'data' directory contains the following files: Months.xml GetMonthLengths.xsl date.get-days-in-month.template Months.xml contains: <?xml version="1.0"?> <months> <month>1</month> <month>2</month> <month>3</month> </months> GetMonthLengths.xsl contains: <?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:date="http://exslt.org/dates-and-times" extension-element-prefixes="date"> <xsl:import href="/data/date.get-days-in-month.template.xsl"/> <xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/> <xsl:template match="/"> <xsl:element name="month-lengths"> <xsl:apply-templates select="months/month"/> </xsl:element> </xsl:template> <xsl:template match="month"> <xsl:element name="month-length"> <xsl:call-template name="date:get-days-in-month"> <xsl:with-param name="month" select="."/> </xsl:call-template> </xsl:element> </xsl:template> </xsl:stylesheet> date.get-days-in-month.template contains: <?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl=http://www.w3.org/1999/XSL/Transform xmlns:date=http://exslt.org/dates-and-times extension-element-prefixes="date"> <date:month-lengths> <date:month>31</date:month> <date:month>28</date:month> <date:month>31</date:month> <date:month>30</date:month> <date:month>31</date:month> <date:month>30</date:month> <date:month>31</date:month> <date:month>31</date:month> <date:month>30</date:month> <date:month>31</date:month> <date:month>30</date:month> <date:month>31</date:month> </date:month-lengths> <xsl:template name="date:get-days-in-month"> <xsl:param name="month"/> <xsl:variable name="month-days" select="document('')/*/date:month-lengths/date:month" /> <xsl:value-of select="$month-days[number($month)]" /> </xsl:template> </xsl:stylesheet> My URIResolver is as follows: public Source resolve( String href, String basePath) { Source source = null; System.out.println("href: " + href); System.out.println("basePath: " + basePath); if (href != null) { boolean isEmptyHRef = href.equals(""); if (!isEmptyHRef) { ServletContext servletContext = getServletContext(); InputStream inputStream = servletContext.getResourceAsStream(href); if (inputStream != null) source = new StreamSource(inputStream); } } System.out.println("source: " + source); return source; } The output is: href: /data/date.get-days-in-month.template.xsl basePath: source: javax.xml.transform.stream.StreamSource@1d439fe href: basePath: source: null Error on line 1 column 1 of file:/c:/morandum/source/http/servlet/war/: SXXP0003: Error reported by XML parser: Content is not allowed in prolog. outputText: <month-lengths> <month-length/> <month-length/> Recoverable error <month-length/> FODC0002: org.xml.sax.SAXParseException: Content is not allowed in prolog. </month-lengths> Recoverable error FODC0005: Document has been marked not available: Recoverable error FODC0005: Document has been marked not available: As you can see, URI resolution works fine for resolving <xsl:import href="/data/date.get-days-in-month.template.xsl"/>). But it does NOT work properly (or according to spec, as far as I can tell) for resolving <xsl:variable name="month-days" select="document('')/*/date:month-lengths/date:month" />. This problem occurs whether I use Resin or Google App Engine as my web server, and whether I use Saxon 9.2 or the default XML parser for transformation. Things work flawlessly if I run the transformation using an ordinary Java program from the command line (without a URIResolver). My understanding is that, if the URIResolver returns null, resolution will be handled in the default manner. And the default manner for document() is to refer to the current document. It is not doing so. Who is to blame here? The servlet containers, the XML parsers, or me? -- Roger L. Cauvin @rcauvin (Twitter) cauvin.blogspot.com (blog)
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