need help with base64 binary encoding in my own processor

Hi!

I'm new to the orbeon environment and I've tried to write a processor quite similar to the xls-serializer.
(1) Read an Excel template            [ok]
(2) Modify it using the POI library   [ok]
(3) return to the contenhandler a correct XML document which contain the base64Binary Data [problem]

When I write the Excel Document on disk it is correctly modified but when I try to write it in base64 and pass it to an HTTP-serializer, the document is recognize as a text document (wrong MIME) and it is empty -_-' (I'm pretty sur that I'm loosing all data when trying to convert in base64 but I don't see my error...)

I put here the fragment of the XPL pipeline that I'm using and the java code that is responsible for creating the base64 binary data

<!-- the class XLSInsertion must return a binary document but... -->
<p:processor name="oxf:java" xmlns:p="http://www.orbeon.com/oxf/pipeline">
    <p:input name="config">
        <config sourcepath="./java" class="org.cgcis.XLSInsertion"/>
    </p:input>
    <p:input name="data">...</p:input>
    <p:output name="data" id="xls-binary"/>
</p:processor>
       
<!-- Serialize -->
<p:processor name="oxf:http-serializer">
    <p:input name="data" href="#xls-binary"/>
    <p:input name="config">
        <config>
            <header>
                <name>Content-Disposition</name>
                <value>attachment; filename=report.xls</value>
            </header>
        </config>
    </p:input>
</p:processor>


And here a fragment of the generate method of XLSInsertion

public void generateData(final PipelineContext pipelineContext,
                         ContentHandler contentHandler) {
[...]  
    wb.write(os);
    char[] cbuf = new char[0];
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os,
                                                  Charset.forName("UTF-8")));
    bw.write(cbuf);
    os.close();

    /* Here I want to create a binary document looking like :
     * <document xsi:type="base64Binary"
     *           content-type="application/vnd.ms-excel">
     *   /9j/3H4BLHERBFQ348IZU7 ... 34RFQ34F3Q43R3Q4==
     * </document>
     *
     * But it doesn't work :'(
     */
    AttributesImpl atts = new AttributesImpl();
    atts.addAttribute("http://www.w3.org/2001/XMLSchema-instance",
                      "type",
                      "xsi:type",
                      "String",
                      "xs:base64Binary");
    atts.addAttribute("",
                      "content-type",
                      "content-type",
                      "String",
                      "application/vnd.ms-excel");
    contentHandler.startDocument();
    contentHandler.startElement("", "document", "document", atts);
    contentHandler.characters(cbuf, 0, os.toString().length());
    contentHandler.endElement("", "document", "document");
    contentHandler.endDocument();
[...]
}

Thank you for your attention and have a nice day!



ps. I'm using OF 3.5 milestone 1 (nightly release from 15 november 2006)
ps2. Sorry for my poor english -_-'
ps3. The problem of the empty document is more a java programming problem but if  someone see quickly my error it would help me a lot ^^



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Youpii! All works now.

After looking at the "4.1 input Document Format" section the HTTP Serializer and the BinaryTextContentHandler.java, I found finally my errors (may it help someone...) :

1) My own processor is follow by an HTTPSerializer processor so I have to produce the binary content of the Workbook encoded with the base64 algo.  (wb -> ByteArrayOutputStream -> byte [] -> String (base64) -> char[])
The library that give a method to convert a byte[] in a base64 encoded String is  free : http://iharder.sourceforge.net/current/java/base64/

2) The document that I had to produce was something like :
<document xsi:type="xs:base64Binary" content-type="application/vnd.ms-excel">
    ASGTRGHR4G5DAS3094===
</document>

The problem was that I didn't bind the "xs" prefix of xs:base64binary with the uri "http://www.w3.org/2001/XMLSchema". Here is some lines of the code inside the method generateData(PipelineContext context, ContentHandler handler)...

/* map the xs prefix with its respective URI */
contentHandler.startPrefixMapping("xs", "http://www.w3.org/2001/XMLSchema");

/* Prepare attributes of the document element () */
AttributesImpl atts = new AttributesImpl();
atts.addAttribute("http://www.w3.org/2001/XMLSchema-instance", "type", "xsi:type", ContentHandlerHelper.CDATA, "xs:base64Binary");
atts.addAttribute("", "content-type", "content-type", ContentHandlerHelper.CDATA, CONTENT_TYPE);

/* Write the correct xml input document to send to the HTTP-serializer */
contentHandler.startDocument();
contentHandler.startElement("", "document", "document", atts);
contentHandler.characters(tab2, 0, tab2.length);
contentHandler.endElement("", "document", "document");
contentHandler.endPrefixMapping("xs");
contentHandler.endDocument();

Have a nice day!



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Glad to hear that it's working now!

-Erik

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