Metacat

/**

 *    Purpose: A Class that validates XML documents

 *             This class is designed to be 'parser independent

 *             i.e. it uses only org.xml.sax classes

 *             It is tied to SAX 2.0 methods

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

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Dan Higgins, Matt Jones

 *     '$Date$'

 * '$Revision$'

 * 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

import java.net.MalformedURLException;

import java.util.*;

import java.io.*;

import java.lang.reflect.*;

import org.w3c.dom.*;

import org.xml.sax.*;

import org.xml.sax.helpers.XMLReaderFactory;

import com.arbortext.catalog.*;

/**

 *                National Center for Ecological Analysis and Synthesis

 *                April 28, 2000

  static int ERROR=1;

  static int FATAL_ERROR=2;

  XMLReader parser;

  ErrorStorer ef;

  String xml_doc; // document to be parsed

  public DBValidate(String parserName) {

    try {

      // Get an instance of the parser

      parser = XMLReaderFactory.createXMLReader(parserName);

      parser.setFeature("http://xml.org/sax/features/validation",true);

      //parser.setValidationMode(true);     // Oracle

    } catch (Exception e) {

    CatalogEntityResolver cer = new CatalogEntityResolver();

    try {

      Catalog myCatalog = new Catalog();

      myCatalog.loadSystemCatalogs();

      myCatalog.parseCatalog(xmlcatalogfile);

      cer.setCatalog(myCatalog);

      System.out.println("Problem creating Catalog in DBValidate.DBValidate");

    }

    parser.setEntityResolver(cer);

  }

  public DBValidate(String parserName, Connection conn) {

    this(parserName);

    DBEntityResolver dbresolver = new DBEntityResolver(conn);

    parser.setEntityResolver(dbresolver);

  }

   * validate an xml document against its DTD

   *

   * @param doc the filename of the document to validate

   */

  public boolean validate(String doc) {

    xml_doc = doc;

    ef = new ErrorStorer();

    ef.resetErrors();

    parser.setErrorHandler(ef);

    try {

      parser.parse((createURL(xml_doc)).toString());

    } catch (IOException e) {

                         " from DBValidate.validate");

      if (ef.errorNodes == null)  ef.errorNodes = new Vector();

      ef.errorNodes.addElement(eip);

      // {System.out.println("Exception parsing:Could not parse :"+xml_doc);}

      ef.getErrorNodes().size() > 0 ) {

      return false;

    } else {

      return true;

   * validate an xml document against its DTD

   *

   * @param xmldoc the String containing the xml document to validate

   */

  public boolean validateString(String xmldoc) {

    ef.resetErrors();

    parser.setErrorHandler(ef);

    InputSource is = new InputSource(new StringReader(xmldoc));

    try {

      parser.parse(is);

    }

      System.out.println("Error in parsing in DBValidate.validateString");

    }

      ef.getErrorNodes().size() > 0 ) {

      return false;

    } else {

      return true;

    errorstring.append("<?xml version=\"1.0\" ?>\n");

        ef.getErrorNodes().size() > 0 ) {

      Vector errors = ef.getErrorNodes();

                      ((ParseError)(e.nextElement())).toXML());

  private URL createURL(String name) throws Exception {

    try {

      URL u = new URL(name);

      return u;

    } catch (MalformedURLException ex) {

    }

    URL u = new URL("file:" + new File(name).getAbsolutePath());

    return u;

  }

  /**

   * main method for testing

   * <p>

   * Usage: java DBValidate <xmlfile or URL>

   */

  public static void main(String[] args) {

    if (args.length != 1) {

      System.out.println("Usage: java DBValidate <xmlfile or URL>");

      System.exit(0);

    }

    String doc = args[0];

      Connection conn = util.openDBConnection();

      DBValidate gxv = new DBValidate(util.getOption("saxparser"), conn);

      if (gxv.validate(doc)) {

        System.out.print(gxv.returnErrors());

      } else {

        System.out.print(gxv.returnErrors());

      }

    } catch (SQLException e) {

      System.out.println("<error>Couldn't open database connection.</error>");

    } catch (ClassNotFoundException e) {

      System.out.println("<error>Couldn't open database connection.</error>");

  }

  /**

   * ErrorStorer has been revised here to simply create a Vector of

   * ParseError objects

   *

   */

  class ErrorStorer implements ErrorHandler {

    }

     * The client is is allowed to get a reference to the Hashtable,

     * and so could corrupt it, or add to it...

     */

    public Vector getErrorNodes() {

        return errorNodes;

    }

     * The ParseError object for the node key is returned.

     * If the node doesn't have errors, null is returned.

     */

    public Object getError() {

        if (errorNodes == null)

            return null;

        return errorNodes;

    }

     * Reset the error storage.

     */

    public void resetErrors() {

        if (errorNodes != null)

        errorNodes.removeAllElements();

    }

    /***/

    public void warning(SAXParseException ex) {

        handleError(ex, WARNING);

    }

        handleError(ex, ERROR);

    }

        handleError(ex, FATAL_ERROR);

    }

      // System.out.println("!!! handleError: "+ex.getMessage());

        errorNodes = new Vector();

      }

                           ex.getColumnNumber(), ex.getMessage());

      errorNodes.addElement(eip);

    }

   * The ParseError class wraps up all the error info from

   * the ErrorStorer's error method.

   *

   * @see ErrorStorer

   */

  class ParseError extends Object {

    // Data

    //

    int lineNo;

    int charOffset;

    String msg;

     * Constructor

     */

      this.fileName=fileName;

      this.lineNo=lineNo;

      this.charOffset=charOffset;

      this.msg=msg;

    // Getters...

    //

    public String getFileName() { return fileName; }

    public int getLineNo() { return lineNo; }

    public int getCharOffset() { return charOffset;}

    public String getMsg() { return msg; }

    public void setMsg(String s) { msg = s; }

    /** Return the error message as an xml fragment */

    public String toXML() {

      StringBuffer err = new StringBuffer();

      err.append("<error>\n");

      err.append("<filename>").append(getFileName()).append("</filename>\n");

      err.append("<line>").append(getLineNo()).append("</line>\n");

      err.append("<offset>").append(getCharOffset()).append("</offset>\n");

      err.append("<message>").append(getMsg()).append("</message>\n");

      err.append("</error>\n");

      return err.toString();

    }