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From Matthias Müller <pym...@yahoo.de>
Subject Re: [C2.2] Get Element from uploaded file
Date Fri, 18 Nov 2011 07:33:36 GMT
I extended your first approach:


in the flow script I use the inputStream from the uploaded file to feed a XpathEvaluator class
in combination with the an xpath expression.

var inputStream = widget.getValue().getInputStream();
var xpath = "/my/path/to/element";
var result = cocoon.getComponent('XPathEvaluator').evaluate(inputStream, xpath);

Thanks again, Matthias




________________________________
 Von: Robby Pelssers <Robby.Pelssers@nxp.com>
An: Matthias Müller <pymote@yahoo.de>; "users@cocoon.apache.org" <users@cocoon.apache.org>

Gesendet: 16:22 Donnerstag, 17.November 2011
Betreff: RE: [C2.2] Get Element from uploaded file
 

I actually had a similar need the other week and while I have used some XML-JAVA mappers like
Castor and XStream in the past I decided to try another approach where I generated JSON which
can be used from flowscript:
 
 
/** flowscript function to generate the pdf **/
 
 
function json2Object(json) {
                return eval("(" + json + ")");
}
 
 
function generatePDF() {
    var id = cocoon.parameters.id;  //e.g. PH3330L
 
 
    //var fileName = cocoon.getComponent('fileNameExtractor').getFileName(id);
 
    var output = new Packages.java.io.ByteArrayOutputStream();
 
    var uri = "extractData/" + id;   
    //now we invoke a pipeline which returns a JSON string. E.g:
    /**
     *   {"id": "PH3330L","fileName": "PH3330L.pdf"},
     */
    cocoon.processPipelineTo(uri, null, output);
 
    var responseData = json2Object(output.toString());    
 
 
    var response = cocoon.response;                         
    response.setHeader(
                "Content-Disposition",
                "attachment; filename=" + responseData.fileName;
    );         
    cocoon.sendPage('source2pdf/' + id);
 
}
 
 
Sitemap:
----------
<!--
  {1} id: unique identifier for the source xml used to generate the PDF
-->
<map:match pattern="generatePdf/*">
  <map:call function="generatePDF">
    <map:parameter name="id" value="{1}"/>
  </map:call>
</map:match>
 
<map:match pattern="source2pdf/*">
  <map:generate src="source/{1}.xml"/> <!-- assume our sources are located in source
folder -->
  <map:transform src="xslt/source2poi.xslt"/>
  <map:serialize type="pdf"/>
</map:match>
 
<!--
  {1} id: unique identifier for the source xml used to generate the PDF
-->
<map:match pattern="extractData/*">
  <map:generate src="source/{1}.xml"/>
  <map:transform src="extractData.xslt"/>
  <map:serialize type="json"/>  <!-- you can quickly test with @type="text" -->
</map:match>
 
 
 
/**** ExtractData.xslt will generate a JSON representation of the DATA needed ****/
 
<?xml version="1.0" encoding="UTF-8"?>
<!--
  Author: Robby Pelssers
-->
 
<xsl:stylesheet version="2.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
    
  <xsl:output method="text" version="1.0" encoding="UTF-8"/>
  
 
  <xsl:template match="/">
    <xsl:text>{"id": "</xsl:text><xsl:value-of select="someXpathExpr"/><xsl:text>",
"fileName: "</xsl:text><xsl:value-of select="someXpathExpr"/>"}<xsl:text></xsl:text>
  </xsl:template>
  
 
    
</xsl:stylesheet>  
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