import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Hashtable;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
import javax.xml.xpath.XPathVariableResolver;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class MainClass {
public static void main(String[] args) throws Exception {
SimpleDateFormat xmlDateFormat = new SimpleDateFormat("MM.dd.yy");
MapVariableResolver resolver = new MapVariableResolver();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbf.newDocumentBuilder();
Document document = builder.parse(new File("t.xml"));
XPathFactory factory = XPathFactory.newInstance();
XPath xPath = factory.newXPath();
xPath.setXPathVariableResolver(resolver);
XPathExpression expression = xPath.compile("/schedule/show[@date=$date]/guest");
String formattedDate = xmlDateFormat.format(new Date(2006, 5, 14));
resolver.addVariable(null, "date", formattedDate);
Element guest = (Element) expression.evaluate(document, XPathConstants.NODE);
System.out.println(guest.getElementsByTagName("name").item(0).getTextContent());
}
}
class MapVariableResolver implements XPathVariableResolver {
private Hashtable variables = new Hashtable();
public void addVariable(String namespaceURI, String localName, Object value) {
addVariable(new QName(namespaceURI, localName), value);
}
public void addVariable(QName name, Object value) {
variables.put(name, value);
}
public Object resolveVariable(QName name) {
Object retval = variables.get(name);
return retval;
}
}
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