/**
* 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;
}
}
public double measureMetric(Document document) {
double count = 0;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try {
XPathExpression expression = xpath.compile(XPATH_QUERY);
count = (Double) expression.evaluate(document, XPathConstants.NUMBER);
} catch (XPathExpressionException e) {
e.printStackTrace();
}
return count;
// Para retornar so 0 ou 1 usar o seguinte:
// return (count > 0.0) ? 1.0 : 0.0;
}
