import oracle.xml.parser.v2.*;
import java.io.*;
import java.net.*;
import org.w3c.dom.*;
import org.xml.sax.*;

/*
** Useful helper routines for making it even easier
** to work with selecting nodes from XML files using
** Oracle's XSLT Engine and XMLNode.selectNodes() Method.
*/

public class XSLT {

  public static NodeList select(Document d, String pattern) {
    return select((XMLDocument)d,pattern);
  }

  public static NodeList select(XMLDocument d, String pattern) {
    try {
      return ((XMLNode)d).selectNodes(pattern,(NSResolver)d.getDocumentElement());
    }
    catch (XSLException x) {
      return null;
    }
  }

  public static NodeList select(Element n, String pattern) {
    return select((XMLElement)n,pattern);
  }

  public static NodeList select(XMLElement n, String pattern) {
    try {
      return n.selectNodes(pattern,n);
    }
    catch (XSLException x) {
      return null;
    }
  }

  public static String valueOf(Element n, String pattern) {
    return valueOf( (XMLNode) n, pattern );
  }

  public static String valueOf(Node n, String pattern) {
    return valueOf( (XMLNode) n, pattern );
  }

  public static String valueOf(XMLElement n, String pattern) {
    return valueOf( (XMLNode) n, pattern );
  }

  public static String valueOf(XMLNode n, String pattern) {
    try {
      NSResolver res = null;

      if ( n instanceof XMLElement ) res = (NSResolver) n;

      NodeList nl = n.selectNodes(pattern, res);

      if (nl != null && nl.getLength() > 0 ) {

        XMLNode x = (XMLNode) nl.item(0);

        if ( x instanceof XMLText ) {
          return x.getNodeValue();
        }
        else if ( x instanceof XMLAttr ) {
          return ((XMLAttr)x).getNodeValue();
        }
        else if ( x instanceof XMLElement ) {
          ((XMLElement)x).normalize();
          return content((XMLElement)x);
        }
      }
      else {
        return "";
      }
    }
    catch (XSLException x) {
      return "";
    }
    return "";
  }

  private static String content(XMLElement n) {
    StringBuffer content = new StringBuffer();
    XMLNode next = null;
    NodeList nl = n.getChildNodes();
    if (nl != null && nl.getLength() > 0 ) {
      int j = nl.getLength();
      for (int i = 0; i < j; i++ ) {
        XMLNode nd = (XMLNode) nl.item(i);
        short nodetype = nd.getNodeType();
        if (nodetype == Node.TEXT_NODE) {
          content.append(nd.getNodeValue());
        }
        else if (nodetype == Node.ELEMENT_NODE) {
          content.append(content((XMLElement)nd));
        }
      }
    }
    return content.toString();
  }

 public static void process( XMLDocument xml,
                             XSLStylesheet xsl,
                             PrintWriter pw )
                             throws SAXParseException {

    try {


      XSLProcessor  processor = new XSLProcessor();

      DocumentFragment result = processor.processXSL(xsl, (XMLDocument) xml);

         XMLDocument outDoc = new XMLDocument();
         outDoc.appendChild(result);
         outDoc.print(pw);

         System.err.flush();
      }

      catch (Exception e)
      {
         throw new RuntimeException(e.toString());
      }
   }  
}