Support #6505
closed
Unable to resolve nested xsl:include statements in Java code
0%
Description
I am writing a Java application to execute XSLT.
The top level stylesheet includes another stylesheet, which includes another. All using relative URLs.
In the Java code I have tried setting the System ID of the XSLT resource when building my XsltExecutable:
public void setXSLT(String filepath) {
ClassLoader cl = getClass().getClassLoader();
InputStream is = cl.getResourceAsStream(filepath);
URL url = cl.getResource(filepath);
this.xsltStream = new StreamSource(is);
xsltStream.setSystemId(url.toExternalForm());
this.xsltExec = this.xsltCompiler.compile( this.xsltStream);
}
To resolve xsl:include/@href in the XSLT I wrote an implementation of URIResolver:
public class BasicURIResolver implements URIResolver {
@Override
public Source resolve(String href, String base) throws TransformerException {
System.out.println("[BasicURIResolver] href = " + href);
System.out.println("[BasicURIResolver] base = " + base);
ClassLoader cl = this.getClass().getClassLoader();
try {
InputStream is = cl.getResourceAsStream(href);
URL url = cl.getResource(href);
Source source = new StreamSource(is);
source.setSystemId(url.toExternalForm());
return source;
}
catch (Exception ex) {
System.out.println("ERROR: (resolving " + href + ") " + ex.getMessage());
}
return null;
}
}
This is registered in the Saxon config file:
<global
uriResolver="com.oup.bits2word.xml.BasicURIResolver"
/>
This works for the first level of xsl:include, but at the next level down the URL is null and I get the errors:
ERROR: (resolving log4xslt.xsl) Cannot invoke "java.net.URL.toExternalForm()" because "url" is null
ERROR: (resolving common.templates.xsl) Cannot invoke "java.net.URL.toExternalForm()" because "url" is null
ERROR: (resolving common.variables.xsl) Cannot invoke "java.net.URL.toExternalForm()" because "url" is null
The base URI is supplied to the resolve() method as shown in the console log:
[BasicURIResolver] href = lib/utilities/log4xslt/log4xslt.config.xsl
[BasicURIResolver] base = file:/C:/SVN/software/General/HTMLtools/BITS2WORD/BITS2Word/target/classes/BITS2GenXHTML.xslt
[BasicURIResolver] href = log4xslt.xsl
[BasicURIResolver] base = file:/C:/SVN/software/General/HTMLtools/BITS2WORD/BITS2Word/target/classes/lib/utilities/log4xslt/log4xslt.config.xsl
ERROR: (resolving log4xslt.xsl) Cannot invoke "java.net.URL.toExternalForm()" because "url" is null
...
I'm guessing this is a problem in my Java code, or an error in my Saxon configuration, rather than any kind of bug in Saxon but I'm unable to see how to fix it.
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