Metacat

/**

 *        Name: DBSAXWriter.java

 *     Purpose: A Class that reads in an XML text document and

 *              write its contents to a database connection using SAX

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

 *              National Center for Ecological Analysis and Synthesis

 *     Authors: Matt Jones

 *

 *     Version: '$Id: DBWriter.java 35 2000-04-13 16:48:37Z jones $'

 */

import org.xml.sax.*;

import java.io.*;

import java.net.URL;

import java.net.MalformedURLException;

import java.sql.*;

import java.util.Stack;

// Extensions to the SAX Interfaces for Namespace support.

import oracle.xml.parser.v2.XMLDocumentHandler;

import oracle.xml.parser.v2.DefaultXMLDocumentHandler;

import oracle.xml.parser.v2.NSName;

import oracle.xml.parser.v2.SAXAttrList;

import oracle.xml.parser.v2.SAXParser;

/**

 * A Class that reads in an XML text document and

 * write its contents to a database connection using SAX

 */

public class DBSAXWriter {

  static  String 	defaultDB = "jdbc:oracle:thin:@localhost:1521:test";

  private Connection	conn = null;

  /**

   * the main routine used to test the DBSAXWriter utility.

   *

   * Usage: java DBSAXWriter <filename> <user> <password> [dbstring]

   *

   * @param filename the filename to be loaded into the database

   * @param user the username to use for the database connection

   * @param password the password to use for the database connection

   * @param dbstring the connection info to use for the database connection

   */

  static public void main(String[] args) {

     if (args.length < 3)

     {

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

        System.err.println("USAGE: java DBSAXWriter " +

                           "<filename> <user> <password> [dbstring]");

        return;

     } else {

        try {

          String filename = args[0];

          String user     = args[1];

          String password = args[2];

          String dbstring = null;

          if (args.length <= 3) {

            dbstring = defaultDB;

          } else {

            dbstring = args[3];

          }

          new DBSAXWriter(filename, user, password, dbstring);

          System.out.println("Document processing finished for: " + filename);

        } catch (Exception e) {

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

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

          e.printStackTrace(System.err);

        }

     }

  }

  /**

   * construct a new instance of the class to write an XML file to the database

   *

   * @param filename the filename to be loaded into the database

   * @param user the username to use for the database connection

   * @param password the password to use for the database connection

   * @param dbstring the connection info to use for the database connection

   */

  public DBSAXWriter( String filename, String user, 

                  String password, String dbstring) 

                  throws IOException, 

                         SQLException, 

                         ClassNotFoundException

   {

     // Open a connection to the database

     conn = openDBConnection(

                "oracle.jdbc.driver.OracleDriver",

                dbstring, user, password);

     //

     // Set up the SAX document handlers for parsing

     //

     try {

        // Use the XMLDocumentHandler interface for namespace support

        // instead of org.xml.sax.DocumentHandler

        XMLDocumentHandler xmlDocHandler = new DBSAXHandler(conn);

        // For all the other interface use the default provided by

        // Handler base

        HandlerBase defHandler = new HandlerBase();

        // Get an instance of the parser

        SAXParser parser = new SAXParser();

        // Set Handlers in the parser

        // Set the DocumentHandler to XMLDocumentHandler

        parser.setDocumentHandler(xmlDocHandler);

        // Set the other Handler to the defHandler

        parser.setErrorHandler(defHandler);

        parser.setEntityResolver(defHandler);

        parser.setDTDHandler(defHandler);

        try

        {

           parser.parse(fileToURL(new File(filename)).toString());

        }

        catch (SAXParseException e)

        {

           System.err.println(filename + ": " + e.getMessage());

        }

        catch (SAXException e)

        {

           System.err.println(filename + ": " + e.getMessage());

        }

     }

     catch (Exception e)

     {

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

     }

   }

   /** Utility method to establish the JDBC connection */

   private Connection openDBConnection(String dbDriver, String connection,

                String user, String password)

                throws SQLException, ClassNotFoundException {

     // Load the Oracle JDBC driver

     Class.forName (dbDriver);

     // Connect to the database

     Connection conn = DriverManager.getConnection( connection, user, password);

     return conn;

   }

   /** Utility method to convert a file handle into a URL */

   static public URL fileToURL(File file) 

   {

     String path = file.getAbsolutePath();

     String fSep = System.getProperty("file.separator");

     if (fSep != null && fSep.length() == 1)

       path = path.replace(fSep.charAt(0), '/');

     if (path.length() > 0 && path.charAt(0) != '/')

       path = '/' + path;

     try {

       return new URL("file", null, path);

     }

     catch (java.net.MalformedURLException e) {

       /* According to the spec this could only happen if the file

	  protocol were not recognized. */

       throw new Error("unexpected MalformedURLException");

     }

  }

}