/* PURPOSE:This is a servelet which given the file names of of an xml schema will produce a web form, so an XML document can then be loaded in to the form or edited. BY: Charles Pugh DATE: 1/8/2000 */ import java.util.*; import java.io.*; import org.w3c.dom.*; import org.w3c.dom.Document; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import javax.servlet.*; import javax.servlet.http.*; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import com.sun.xml.tree.*; public class Schema extends HttpServlet { Document doc; Document xmlDoc; PrintWriter out; String[] param = new String[4]; String root = "Error"; public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); out = response.getWriter(); writeHTML(request); } public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } public void writeHTML(HttpServletRequest request)throws ServletException, IOException { String title = "XML Document Form"; out.println("\n" + "\n" + "" + title + "\n"+ "\n" + "

" + title + "

\n"); parseXML(request); makeForm(); out.println("

"); out.println(""); } public void parseXML(HttpServletRequest request) throws ServletException, IOException { param[0] = request.getParameter("schFN"); param[1] = request.getParameter("schDIR"); param[2] = request.getParameter("xmlFN"); param[3] = request.getParameter("xmlDIR"); //Prints out the input parameters /*for(int i=0; i<4;i++) { out.println("Param name : " + param[i] + "\n"); out.println("

"); }*/ if (param[0] == "") { parseError ("No XML filename "); } try { DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder(); doc = docBuilder.parse (new File (param[1], param[0])); if (!(param[2].equals(""))){ xmlDoc = docBuilder.parse (new File (param[3], param[2])); out.println("

Form contains the parsed xml file: " + param[2]); } }//end Try catch (SAXParseException err) {System.out.println ("** Parsing error" + ", line " + err.getLineNumber () + ", uri " + err.getSystemId ()); parseError(" " + err.getMessage ()); // print stack trace as below } catch (SAXException e) {/* Exception x = e.getException (); ((x == null) ? e : x).printStackTrace (); */ } catch (Throwable t) {/* t.printStackTrace (); */ } }//end parseXML public void parseError (String error){ out.println("" + error); } public void makeForm(){ //out.println("

The Schema root is : " + doc.getDocumentElement().getNodeName() + "\n"); //out.println("

"); Node elem1 = doc.getDocumentElement().getChildNodes().item(1); String SchemaName = elem1.getAttributes().item(0).getNodeValue(); out.println("

The Schema name is : " + SchemaName + "\n"); out.println("

"); out.println("

"); out.println("

"); String type = findType(elem1); if (type == "simple") dealWithSimple(elem1); if (type == "complex") dealWithComplex(elem1); out.println("

To enlarge the text boxes to fit the the data input. Hit "); out.println("

XML Filename "); out.println(" File Location "); out.println("

"); out.println("

"); }//end makeForm public String findType(Node el){ String type = "simple"; if (el.getChildNodes().getLength() > 0){ for(int i=1; i < el.getChildNodes().getLength(); i=i+2){ //out.println("

The Element " + el.getChildNodes().item(i).getNodeName()); if(el.getChildNodes().item(i).getNodeName() == "xsd:complexType") type = "complex"; }//end for }//end if else type = "simple"; return type; }//end findType public void dealWithSimple (Node el){ String elName = el.getAttributes().getNamedItem("name").getNodeValue(); out.println("
      " + elName); out.println(""); }//end DealWithSimple public void dealWithComplex(Node el){ out.println("

The Element " + el.getAttributes().getNamedItem("name").getNodeValue() + " contains :-"); Node elem2 = el.getChildNodes().item(1); for (int i=1; i < elem2.getChildNodes().getLength(); i=i+2){ String type = findType(elem2.getChildNodes().item(i)); if (type == "simple") dealWithSimple(elem2.getChildNodes().item(i)); if (type == "complex") dealWithComplex(elem2.getChildNodes().item(i)); }//end for for (int i=0; i < el.getAttributes().getLength(); i++){ String a = el.getAttributes().item(i).getNodeValue(); String b = "unbounded"; if (a.equals(b)){ String c = el.getAttributes().getNamedItem("name").getNodeValue(); out.println("

Element " + c + " "); /*Node rep = el.getChildNodes().item(1); for (int j=1; j < rep.getChildNodes().getLength(); j=j+2){ String type = findType(rep.getChildNodes().item(j)); if (type == "simple") dealWithSimple(rep.getChildNodes().item(j)); if (type == "complex") dealWithComplex(rep.getChildNodes().item(j)); }//end for*/ }//end if }//end for }//end dealWithComplex public void fillField(Node el){ String a = el.getAttributes().getNamedItem("name").getNodeValue(); String b = xmlDoc.getDocumentElement().getElementsByTagName(a).item(0).getChildNodes(). item(0).getNodeValue(); out.println("VALUE=\"" + b + "\""); } }//end Schema