com.adito.tunnels.TunnelDatabaseFactory.java Source code

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Here is the source code for com.adito.tunnels.TunnelDatabaseFactory.java

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/*
*  Adito
*
*  Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
*
*  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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

package com.adito.tunnels;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * System database factory for creating system databases.
 */
public class TunnelDatabaseFactory {
    static Log log = LogFactory.getLog(TunnelDatabaseFactory.class);

    static TunnelDatabase instance;
    static Class<? extends TunnelDatabase> tunnelDatabaseImpl = JDBCTunnelDatabase.class;
    private static boolean locked = false;

    /**
     * @return An instance of the tunnel database factory.
     */
    public static TunnelDatabase getInstance() {
        try {
            return instance == null ? instance = (TunnelDatabase) tunnelDatabaseImpl.newInstance() : instance;
        } catch (Exception e) {
            log.error("Could not create instance of class " + tunnelDatabaseImpl.getCanonicalName(), e);
            return instance == null ? instance = new JDBCTunnelDatabase() : instance;
        }
    }

    /**
     * @param tunnelDatabaseImpl the class of the system database
     * @param lock weather to lock the policy database after setting it.
     * @throws IllegalStateException
     */
    public static void setFactoryImpl(Class<TunnelDatabase> tunnelDatabaseImpl, boolean lock)
            throws IllegalStateException {
        if (locked) {
            throw new IllegalStateException("System database factory has been locked by another plugin.");
        }
        TunnelDatabaseFactory.tunnelDatabaseImpl = tunnelDatabaseImpl;
        locked = lock;
    }
}