Metacat

/**

 *  '$RCSfile$'

 *    Purpose: An abstract class that is a template for a data transfer class

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

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Chad Berkley

 *    Release: @release@

 *

 *   '$Author: berkley $'

 *     '$Date: 2001-01-18 15:15:21 -0800 (Thu, 18 Jan 2001) $'

 * '$Revision: 675 $'

 *

 * 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.net.*;

import java.io.*;

import java.util.Properties;

import java.util.Date;

import java.text.SimpleDateFormat;

import java.sql.*;

abstract class DataFileUploadInterface extends Thread 

{

  private MetaCatUtil util = new MetaCatUtil();

  private static String filedir = "";

  private String user = null;

  private String sess_id = null;

  private int port;

  protected Socket s;

  /**

   * Sets the port, user and sess_id

   */

  DataFileUploadInterface(int port, String user, String sess_id) 

  {

    this.sess_id = sess_id;

    this.user = user;

    this.port = port;

    filedir = util.getOption("datafilepath");

  }

  /**

   * Override this method with the code to handle the socket connection to 

   * the port specified in the constructor.

   */

  abstract void getFile(int port, String user, String sess_id);

  /**

   * This method is invoked when this class is broken off into a new thread

   */

  public void run () 

  {

    getFile(port, user, sess_id);

  }

  /**

   * attempts to connect a socket, returns null if it is not successful

   * returns the connected socket if it is successful.

   */

  public static Socket getSocket(String host, int port)

  {

    Socket s = null;

    try

    {

      s = new Socket(host, port);

      //we could create a socket on this port so the port is not available

      //System.out.println("socket connnected");

      return s;

    }

    catch(UnknownHostException u)

    {

      System.out.println("unknown host in DataFileUploadInterface.getSocket");

    }

    catch(IOException i)

    {

      //an ioexception is thrown if the port is not in use

      //System.out.println("socket not connected");

      return s;

    }

    return s;

  }

  /**

   * returns true if the port specified is not in use.  false otherwise

   */

  public static boolean portIsAvailable(int port)

  {

    Socket s;

    String host = "localhost";

    try

    {

      s = new Socket(host, port);

      //s.close();

      //we could create a socket on this port so the port is not available

      //System.out.println("socket not available");

      return false;

    }

    catch(UnknownHostException u)

    {

      System.out.println("unknow host error in " + 

                         "DataFileUploadInterface.portIsAvailable");

    }

    catch(IOException i)

    {

      //an ioexception is thrown if the port is not in use

      //System.out.println("socket available");

      return true;

    }

    return true;

  }

  /**

   * Updates xml_documents with the new data document information

   * @param accnum the accession number of the new data file

   * @param filename the filename of the new data file

   * @param userOwner the document's owner's username

   */

  public void updateDB(String accnum, String filename, String userOwner)

  {

    SimpleDateFormat formatter = new SimpleDateFormat ("yy-MM-dd HH:mm:ss");

    java.util.Date localtime = new java.util.Date();

    String dateString = formatter.format(localtime);

    String sqlDateString = "to_date('" + dateString + "', 'YY-MM-DD HH24:MI:SS')";

    StringBuffer sql = new StringBuffer();

    sql.append("insert into xml_documents (docid, docname, doctype, ");

    sql.append("user_owner, user_updated, server_location, rev, date_created");

    sql.append(", date_updated, public_access) values ('");

    sql.append(accnum).append("','").append(filename).append("','BIN','");

    sql.append(userOwner).append("','").append(userOwner).append("','1','");

    sql.append("1',").append(sqlDateString).append(",");

    sql.append(sqlDateString).append(",'0')");

    //System.out.println("sql: " + sql.toString());

    try

    {

      Connection conn = util.openDBConnection();

      PreparedStatement pstmt = conn.prepareStatement(sql.toString());

      pstmt.execute();

      pstmt.close();

      conn.close();

    }

    catch(Exception e)

    {

      System.out.println("error with db connection in DataFileServer.updateDB" +

                         ": " + e.getMessage());

    }

  }

}