Metacat

/**

 *    Purpose: A Class that transforms an XML text document

 *             into a another type using XSL

 *  Copyright: 2000 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Matt Jones

 * '$Date$'

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

package edu.ucsb.nceas.metacat;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.StringReader;

import java.io.Writer;

import java.sql.SQLException;

import java.util.Map;

import javax.xml.transform.Transformer;

import javax.xml.transform.stream.StreamSource;

import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.NodeList;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

import org.xml.sax.InputSource;

import org.apache.xpath.XPathAPI;

import edu.ucsb.nceas.metacat.properties.SkinPropertyService;

import edu.ucsb.nceas.utilities.PropertyNotFoundException;

 */

public class DBTransform {

  private String	defaultStyle = null;

   * construct a DBTransform instance.

   *

   * Generally, one calls transformXMLDocument() after constructing the instance

   *

   * @param conn the database connection from which to lookup the public ids

   */

                  throws IOException,

                         SQLException,

                         PropertyNotFoundException

    defaultStyle = PropertyService.getProperty("application.default-style");

    contextURL = SystemUtil.getContextURL();

   * Transform an XML document using the stylesheet reference from the db

   *

   * @param doc the document to be transformed

   * @param sourcetype the document type of the source

   * @param targettype the target document type

   * @param pw the PrintWriter to which output is printed

                                   String targetType, String qformat,

	  try {

		  // Look up the stylesheet for this type combination

		  if (xslSystemId != null) {

			// Create a stylesheet from the system id that was found

			doc = removeDOCTYPE(doc);

			doTransform(xml, result, xslSystemId, param, qformat, sessionid);

		  }

		  else {

			  // No stylesheet registered form this document type, so just return the

			  // XML stream we were passed

			  w.write(doc);

		  }

      catch (Exception e)

      {

	           "DBTransform.transformXMLDocument: " +

	           e.getMessage();

    		  w.write(msg);

    		  w.flush();

    		  logMetacat.error(msg, e);

			logMetacat.error(e1.getMessage(), e1);

		}

   * Reads skin's config file if it exists, and populates Transformer paramaters

   * with its contents.

   * It then adds the parameters passed to it via Hashtable param to the Transformer.

   * It then calls the Transformer.transform method.

          String xslSystemId,

          String sessionid)

          throws Exception {

      Transformer transformer;

      String key, value;

      Iterator<Map.Entry<String, String>> iterIt;

      Map.Entry<String, String> entry;

      if (xslSystemId != null) {

        tFactory = TransformerFactory.newInstance();

        transformer = tFactory.newTransformer(new StreamSource(xslSystemId));

        if (skinOptions != null) {

            iterIt = skinOptions.getProperties().entrySet().iterator();

                key = entry.getKey();

                value = entry.getValue();

                if (key.indexOf('.') == -1) {

                	transformer.setParameter(key, value);

                }

        }

        }

        logMetacat.debug("DBTransform.doTransform - httpServer: " + httpServer);

        logMetacat.debug("DBTransform.doTransform - contextURL: " + contextURL);

        logMetacat.debug("DBTransform.doTransform - serletURL: " + servletURL);

          en = param.keys();

          while (en.hasMoreElements()) {

            value = (param.get(key))[0];

          }

        }

  }//doTransform

   * @param f the file to parse

   * @param path the path to get the content from

   */

    if(f == null)

    {

      return null;

    }

    InputSource in;

    FileInputStream fs;

      in = new InputSource(fs);

    }

    catch(FileNotFoundException fnf)

    {

      fnf.printStackTrace();

      return null;

    }

    {

      parser.parse(in);

      fs.close();

    }

    catch(Exception e1)

    {

      return null;

    }

    {

      NodeList docNodeList = XPathAPI.selectNodeList(doc, path);

      return docNodeList;

    }

    catch(Exception se)

    {

      return null;

    }

  }

  /**

   * Lookup a stylesheet reference from the db catalog

   *

   * @param sourcetype the document type of the source

   * @param targettype the document type of the target

   */

    String systemId = null;

    if ((qformat == null) || (qformat.equals("html"))) {

      qformat = defaultStyle;

    }

    // Load the style-set map for this qformat into a DOM

    try {

      NodeList nlDoctype = getPathContent(f, "/style-set/doctype");

      NodeList nlDefault = getPathContent(f, "/style-set/default-style");

      Node nDefault = nlDefault.item(0);

      systemId = nDefault.getFirstChild().getNodeValue(); //set the default

      { //look for the right sourcetype

        Node nDoctype = nlDoctype.item(i);

        NamedNodeMap atts = nDoctype.getAttributes();

        Node nAtt = atts.getNamedItem("publicid");

        String doctype = nAtt.getFirstChild().getNodeValue();

        if(doctype.equals(sourcetype))

        { //found the right sourcetype now we need to get the target type

          NodeList nlChildren = nDoctype.getChildNodes();

          for(int j=0; j<nlChildren.getLength(); j++)

          {

            Node nChild = nlChildren.item(j);

            String childName = nChild.getNodeName();

            if(childName.equals("target"))

            {

              NamedNodeMap childAtts = nChild.getAttributes();

              Node nTargetPublicId = childAtts.getNamedItem("publicid");

              String target = nTargetPublicId.getFirstChild().getNodeValue();

              if(target.equals(targettype))

              { //we found the right target type

                NodeList nlTarget = nChild.getChildNodes();

                for(int k=0; k<nlTarget.getLength(); k++)

                {

                  Node nChildText = nlTarget.item(k);

                  if(nChildText.getNodeType() == Node.TEXT_NODE)

                  { //get the text from the target node

                    systemId = nChildText.getNodeValue();

                    breakflag = true;

                    break;

                  }

                }

            }

            {

              break;

            }

        }

        {

          break;

        }

    }

    {

      System.out.println("Error parsing style-set file: " + e.getMessage());

      e.printStackTrace();

    }

    //Check if the systemId is relative path, add a postfix - the contextULR to systemID.

    	systemId = contextURL+systemId;

    }

  }

//    points to system id in xml_catalog table

//  */

//  private void modifiedXmlStreamSource(StreamSource xml, String publicId)

//                                       throws Exception

//  {

//    // make sure the xml is not null

//    if (xml == null || publicId == null)

//    {

//      return;

//    }

//    logMetacat.info("public id of input stream is " +publicId);

//    // Get system id from xml_catalog table

//    String systemId = DBEntityResolver.getDTDSystemID(publicId);

//    logMetacat.info("system id of input stream from xml_catalog"

//                               +"table is " +systemId);

//    //set system id to input stream

//    xml.setSystemId(systemId);

//  }

   * removes the DOCTYPE element and its contents from a Sting

    int startpos = in.indexOf("<!DOCTYPE");

    if (startpos>-1) {

    } else {

      return in;

    }

  /**

   * the main routine used to test the transform utility.

   *

  static public void main(String[] args) {

        System.err.println("Wrong number of arguments!!!");

     } else {

        try {

          StringBuffer testdoc = new StringBuffer();

          testdoc.append("<?xml version=\"1.0\" encoding=\"" + encoding + "\"?>");

          testdoc.append("<dataset_id>DS001</dataset_id>");

          testdoc.append("<title>My test doc</title></eml-dataset>");

          // Transform the document to the new doctype

                                   "-//NCEAS//eml-dataset//EN",

                                   "-//W3C//HTML//EN",

        } catch (Exception e) {

          System.err.println("EXCEPTION HANDLING REQUIRED");

          System.err.println(e.getMessage());

          e.printStackTrace(System.err);

        }

     }

  }

//    System.err.println("Debug flag: " + position);

//  }