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import java.io.FileReader;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.xml.sax.InputSource;
public class MainClass {
public static void main(String[] args) throws Exception {
XPathFactory factory = XPathFactory.newInstance();
XPath xPath = factory.newXPath();
SimpleNamespaceContext nsContext = new SimpleNamespaceContext();
nsContext.addNamespace("s", "uri:test:schedule");
xPath.setNamespaceContext(nsContext);
String result = xPath.evaluate("/s:schedule/@name", new InputSource(
new FileReader("t.xml")));
System.out.println(result);
}
}
class SimpleNamespaceContext implements NamespaceContext {
private Map<String, String> urisByPrefix = new HashMap<String, String>();
private Map<String, Set> prefixesByURI = new HashMap<String, Set>();
public SimpleNamespaceContext() {
addNamespace(XMLConstants.XML_NS_PREFIX, XMLConstants.XML_NS_URI);
addNamespace(XMLConstants.XMLNS_ATTRIBUTE, XMLConstants.XMLNS_ATTRIBUTE_NS_URI);
}
public synchronized void addNamespace(String prefix, String namespaceURI) {
urisByPrefix.put(prefix, namespaceURI);
if (prefixesByURI.containsKey(namespaceURI)) {
(prefixesByURI.get(namespaceURI)).add(prefix);
} else {
Set<String> set = new HashSet<String>();
set.add(prefix);
prefixesByURI.put(namespaceURI, set);
}
}
public String getNamespaceURI(String prefix) {
if (prefix == null)
throw new IllegalArgumentException("prefix cannot be null");
if (urisByPrefix.containsKey(prefix))
return (String) urisByPrefix.get(prefix);
else
return XMLConstants.NULL_NS_URI;
}
public String getPrefix(String namespaceURI) {
return (String) getPrefixes(namespaceURI).next();
}
public Iterator getPrefixes(String namespaceURI) {
if (namespaceURI == null)
throw new IllegalArgumentException("namespaceURI cannot be null");
if (prefixesByURI.containsKey(namespaceURI)) {
return ((Set) prefixesByURI.get(namespaceURI)).iterator();
} else {
return Collections.EMPTY_SET.iterator();
}
}
}
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