/* ======================================================================
   Parts Copyright 2006 University of Leeds, Oxford University, University of the Highlands and Islands.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

====================================================================== */

package org.bodington.server.resources;

import org.bodington.server.BuildingServerException;

/**
 * Class for getting instances of ResourceTree. This allows ResourceTree to be 
 * an interface so we don't have classes depending on the implementation.
 * @author buckett
 */
public class ResourceTreeManager
{

    private static ResourceTree the_instance;
    
    /**
     * Get and instance of ResourceTree.
     * @return An instance of ResourceTree.
     */
    public static synchronized ResourceTree getInstance()
    throws BuildingServerException
    {
        if ( the_instance==null )
        {
            the_instance=new ResourceTreeImpl();
            the_instance = new ResourceTreeQuota(the_instance);
            the_instance.loadResources();
        }
        return the_instance;
    }


}