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evaluate XPath Expression from XML file.
java code
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;



public class XPathUtility {


private XPathUtility() {

}


public static String evaluateNode(String expression, InputStream xmlFile) {
Object[] params = { expression, xmlFile };


Node result = null;

DocumentBuilder parser = null;
try {
parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
} catch (ParserConfigurationException parserConfigurationException) {
// Do Something
}
Document doc = null;
try {
doc = parser.parse(xmlFile);
} catch (SAXException saxException) {
// Do Something
} catch (IOException ioException) {
// Do Something
}

XPath xpath = XPathFactory.newInstance().newXPath();

try {

result = (Node) xpath.evaluate(expression, doc, XPathConstants.NODE);

} catch (XPathExpressionException xPathExpressionException) {
// Do Something
}

Document parsedDoc = null;
OutputStream os = null;

try {
parsedDoc = parser.newDocument();
Node importedNode = parsedDoc.importNode(result, true);
os = new ByteArrayOutputStream();

// Prepare the DOM document for writing
Source source = new DOMSource(importedNode);

// Prepare the output String
Result outpuResult = new StreamResult(os);

// Write the DOM document to the outputStream
Transformer xformer = TransformerFactory.newInstance().newTransformer();
xformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
xformer.transform(source, outpuResult);

} catch (TransformerFactoryConfigurationError e) {
// Do Something
} catch (TransformerException e) {
// Do Something
}


return os.toString();
}

}




_________________
M. S. Rakha, Ph.D.
Queen's University
Canada


Author:
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