Retrieving hashmap values in XSLT 2.0 Using Saxon-HE

问题

I want to pass Map object as parameter in XSLT 2.0 version and i want to retrieve the Map object data under XSLT 2.0 file using Saxon-HE.

I googled a lot and found Retrieving hashmap values in XSLT

link which completely matches according to my need but i am getting exception such as

Static error in {map:get($mapData,'1')} in expression in xsl:variable/@select on line 23 column 94 of transformer.xslt: XPST0017: Cannot find a 2-argument function named {http://ns.saxonica.com/map}get().

I don't know where i am doing mistake.

These are the my files. SexsonDemo.java

   public static void transform(String xmlFile, String xslFile) throws TransformerException,
      TransformerConfigurationException {

   TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer(new StreamSource(new File(xslFile)));
   Map<String,String> mapData = new HashMap<String,String>();
   mapData.put("1", "188 E 6th Street");
   transformer.setParameter("mapData", mapData);
   transformer.transform(new StreamSource(new File(xmlFile)), new StreamResult(System.out));
  }

transformer.xsl

xmlns:map="http://ns.saxonica.com/map" exclude-result-prefixes="map" >

<xsl:variable name="mapData"/>
<xsl:variable name="addressData" select="map:get($mapData,'1')"/>

at below line i getting exception map:get($mapData,'1')

回答1:

As for reading XDM maps in XSLT, see https://xsltfiddle.liberty-development.net/6qVRKwZ which has three examples

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:map="http://www.w3.org/2005/xpath-functions/map"
    xmlns:array="http://www.w3.org/2005/xpath-functions/array"
    exclude-result-prefixes="#all"
    expand-text="yes"
    version="3.0">

  <xsl:param name="mapData" as="map(xs:string, xs:string)" select="map { '1' : '188 E 6th Street' }"/>

  <xsl:mode on-no-match="shallow-copy"/>

  <xsl:output method="html" indent="yes" html-version="5"/>

  <xsl:template match="/">
    <html>
      <head>
        <title>.NET XSLT Fiddle Example</title>
      </head>
      <body>
          <h1>XPath 3.1 map example</h1>
          <section>
              <h2>function call syntax</h2>
              <p><code>$mapData('1')</code>: <code>{$mapData('1')}</code></p>
          </section>
          <section>
              <h2>map:get</h2>
              <p><code>map:get($mapData, '1')</code>: <code>{map:get($mapData, '1')}</code></p>
          </section>
          <section>
              <h2><code>?</code> operator</h2>
              <p><code>$mapData?('1')</code>: <code>{$mapData?('1')}</code></p>
          </section>
      </body>
    </html>
  </xsl:template>

</xsl:stylesheet>

For setting this parameter from your Java code, consider using the Saxon s9api http://saxonica.com/html/documentation9.8/using-xsl/embedding/s9api-transformation.html to run Saxon and then you can use hhttp://saxonica.com/html/documentation9.8/javadoc/net/sf/saxon/s9api/Xslt30Transformer.html#setStylesheetParameters-java.util.Map- to pass in an XdmMap constructed from your Java Map with http://saxonica.com/html/documentation9.8/javadoc/net/sf/saxon/s9api/XdmMap.html#makeMap-java.util.Map-.

Short Java sample is

public static void MapExample() throws SaxonApiException {
    Processor processor = new Processor(false);

    XsltExecutable executable = processor.newXsltCompiler().compile(new StreamSource("sheet.xsl"));

    Xslt30Transformer transformer = executable.load30();

    Map<String,String> mapData = new HashMap<String,String>();
    mapData.put("1", "188 E 6th Street");

    HashMap<QName, XdmValue> parameters = new HashMap<>();

    parameters.put(new QName("mapData"), XdmMap.makeMap(mapData));

    transformer.setStylesheetParameters(parameters);

    transformer.applyTemplates(new StreamSource("input1.xml"), transformer.newSerializer(System.out));

    System.out.println();        
}

回答2:

I think that the namespace URI {http://ns.saxonica.com/map} was used during some early Saxon experiments in implementing maps, long before they were part of the W3C specification: see https://www.saxonica.com/html/documentation9.4/extensions/map.html

That specification was long ago superseded by the W3C map functions, which are in namespace http://www.w3.org/2005/xpath-functions/map.

That's part of your problem. The other part is how to convert a Java map to an XDM map. You can do this in Saxon 9.8/9.9 using the static method XdmMap.makeMap(java.util.Map). It might be easier in some cases to pass in a string containing a JSON representation of the map, and then parse it within the stylesheet using the parse-json() function.

来源：https://stackoverflow.com/questions/52966378/retrieving-hashmap-values-in-xslt-2-0-using-saxon-he

标签

java

xml

xslt-2.0

saxon