/**
* Performs an XPATH lookup in an xml document whose filename is specified by the first parameter
* (assumed to be in the auxiliary subdirectory) The XPATH expression is supplied as the second
* string parameter The return value is of type string e.g. this is currently used primarily for
* looking up the Company Prefix Index for encoding a GS1 Company Prefix into a 64-bit EPC tag
*/
private String xpathlookup(String xml, String expression) {
try {
// Parse the XML as a W3C document.
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document document =
builder.parse(new File(xmldir + File.separator + "auxiliary" + File.separator + xml));
XPath xpath = XPathFactory.newInstance().newXPath();
String rv = (String) xpath.evaluate(expression, document, XPathConstants.STRING);
return rv;
} catch (ParserConfigurationException e) {
System.err.println("ParserConfigurationException caught...");
e.printStackTrace();
return null;
} catch (XPathExpressionException e) {
System.err.println("XPathExpressionException caught...");
e.printStackTrace();
return null;
} catch (SAXException e) {
System.err.println("SAXException caught...");
e.printStackTrace();
return null;
} catch (IOException e) {
System.err.println("IOException caught...");
e.printStackTrace();
return null;
}
}
/**
* Saves the query string to a text file. Unspectacular.
*
* @param completeQuery the query string
* @throws IOException
*/
protected void saveCompleteQuery(String completeQuery) throws IOException {
String queryFileName = outputDir + "query" + queryCount + "_" + currentQueryName + ".txt";
System.out.println("\n Saving query to: " + queryFileName);
Writer out = new OutputStreamWriter(new FileOutputStream(queryFileName));
try {
out.write(completeQuery);
} catch (IOException e) {
e.printStackTrace();
} finally {
out.close();
}
}