databasefactory.java

来自「dump3 morpheus 0.2.9 src」· Java 代码 · 共 54 行

/**
 * DuMP3 version morpheus_0.2.9 - a duplicate/similar file finder in Java<BR>
 * Copyright 2005 Alexander Gr&auml;sser<BR>
 * All Rights Reserved, http://dump3.sourceforge.net/<BR>
 * <BR>
 * This file is part of DuMP3.<BR>
 * <BR>
 * DuMP3 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.<BR>
 * <BR>
 * DuMP3 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.<BR>
 * <BR>
 * You should have received a copy of the GNU General Public License along with DuMP3; if not, write to the Free Software Foundation, Inc., 51 Franklin St,
 * Fifth Floor, Boston, MA 02110-1301 USA
 */
package net.za.grasser.duplicate.persist;

/**
 * This class ...
 * 
 * @author <a href="http://sourceforge.net/sendmessage.php?touser=733840">pyropunk at sourceforge dot net</a>
 * @version $Revision: 1.1 $
 */
public class DatabaseFactory {
  /**
   * <code>db</code> DatabaseFactory -
   */
  private static Database db = null;

  /**
   * Constructor
   */
  private DatabaseFactory() {
    super();
  }

  /**
   * This method returns the singleton instance.
   * 
   * @return DatabaseFactory
   */
  public static synchronized Database getDatabase() {
    if (db == null) {
      db = new SQLDatabase();
      if (!db.connect()) {
        db = new FileDatabase();
        db.connect();
      }
    }
    return db;
  }
}