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  Subject: ddtekjava write to file only executed if return used?
Author: Ethan Stein
Date: 13 Dec 2011 11:32 PM
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I have a ddtekjava function that takes in an element node and writes it to a file. It will then return a string indicating whether the write was successful or not. I have found that it only executes if I then use that string as a variable in my output. Is this expected behavior?
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XQuery:
declare namespace xbef = 'ddtekjava:BuildErrorFile';
declare option ddtek:xml-streaming 'yes';
declare option ddtek:serialize "indent=yes, omit-xml-declaration=no";
(: Write error nodes to file :)
declare function xbef:writeXmlFile($outFile as xs:string, $rootNode as xs:string,
$elmToWrite as element(), $encoding as xs:string, $indent as xs:string, $append as xs:string) as xs:string external;
<SIMPLE_ROOT xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="VISA_DATA.xsd">
{for $acctRec at $index in (1 to 5)
let $nodesToWrite := <NODE_TO_WRITE>HELLO WORLD {$index}</NODE_TO_WRITE>
let $writeRecsToFile := xbef:writeXmlFile("C:\sampleFile.xml", "ROOT_NODE", $nodesToWrite, "UTF-8", "yes", "true")
return
<SOME_NODE>SAMPLE TEXT {$index}</SOME_NODE>
}
</SIMPLE_ROOT>
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Java Function:
/**
* Writes XML to file system
*
* @param outFile file to write to
* @param rootNode name of root node (used with new file)
* @param nodeToWrite elements to write to file
* @param encoding XML encoding type for output
* @param indent whether to indent or not (valid values are "yes" | "no")
* @param append flag indicating add to end of file or create new one (valid values are "true" | "false"
* @return Message indicating successful write or error
*/
public static String writeXmlFile(String outFile, String rootNode, Element nodeToWrite, String encoding, String indent, String append) {
FileOutputStream errorFOS = null;
try {
File sourceFile = new File(outFile);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();
Document errorDoc = null;
if (!sourceFile.exists() || !Boolean.parseBoolean(append)) {
errorDoc = builder.newDocument();
Element rootElm = errorDoc.createElement(rootNode);
rootElm.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xsi",
"http://www.w3.org/2001/XMLSchema-instance");
errorDoc.appendChild(rootElm);
} else
errorDoc = builder.parse(sourceFile);
Node elmNode = errorDoc.adoptNode(nodeToWrite);
errorDoc.getDocumentElement().appendChild(elmNode);
// Prepare the DOM document for writing
Source source = new DOMSource(errorDoc);
File errorFile = new File(outFile);
errorFOS = new FileOutputStream(errorFile);
Result result = new StreamResult(errorFOS);
// Write the DOM document to the file
TransformerFactory xFormerFactory = TransformerFactory.newInstance();
Transformer xformer = xFormerFactory.newTransformer();
xformer.setOutputProperty(OutputKeys.INDENT, indent);
xformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "5");
xformer.setOutputProperty(OutputKeys.ENCODING, encoding);
xformer.setOutputProperty(OutputKeys.STANDALONE, "no");
xformer.transform(source, result);
return ("Write to " + outFile + " successful.");
} catch (TransformerConfigurationException tce) {
tce.printStackTrace();
return tce.getMessage();
} catch (TransformerException te) {
te.printStackTrace();
return te.getMessage();
} catch (FileNotFoundException e) {
e.printStackTrace();
return e.getMessage();
} catch (ParserConfigurationException e) {
e.printStackTrace();
return e.getMessage();
} catch (SAXException e) {
e.printStackTrace();
return e.getMessage();
} catch (IOException e) {
e.printStackTrace();
return e.getMessage();
} finally {
try {
if (errorFOS != null)
errorFOS.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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Subject: ddtekjava write to file only executed if return used?
Author: Ethan Stein
Date: 14 Dec 2011 12:03 AM
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Ah, I understand. I switched the function to return an empty sequence and then simply changed it to this:
(: Write error nodes to file :)
declare function xbef:writeXmlFile($outFile as xs:string, $rootNode as xs:string,
$elmToWrite as element(), $encoding as xs:string, $indent as xs:string, $append as xs:string) as empty-sequence() external;
let $writeRecsToFile := xbef:writeXmlFile("C:\sampleFile.xml", "ROOT_NODE", $nodesToWrite, "UTF-8", "yes", "true")
return
<SOME_NODE>SAMPLE TEXT {$index}{$writeRecsToFile}</SOME_NODE>
Now it works. Thanks!
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