/*
 * Copyright 2000-2001,2004 The Apache Software Foundation.
 * 
 * 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.apache.jetspeed.om.security;

import org.apache.turbine.services.TurbineServices;
import org.apache.turbine.services.resources.ResourceService;

import org.apache.jetspeed.services.security.UserException;
import org.apache.jetspeed.services.security.JetspeedSecurityService;

/**
 * Factory class for creating Jetspeed Users.
 * The user class is configured in the JR.p
 *
 * @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
 * @version $Id: JetspeedUserFactory.java,v 1.4 2004/02/23 03:14:12 jford Exp $ 
 */
public class JetspeedUserFactory
{
    private static final String CONFIG_USER_CLASSNAME = "user.class";

    private static String userClassName = null;
    private static Class userClass = null;
    
    /**
     * Factory method to create JetspeedUser instances.  
     *
     *
     * @throws UnknownEntityException when the user instance cant be created.
     * @return JetspeedUser a new created user.
     */
    public static JetspeedUser getInstance()
        throws UserException
    {
        return getInstance(true);
    }

    public static JetspeedUser getInstance(boolean isNew)
        throws UserException
    {
        JetspeedUser user = null;

        if (null == userClassName)
        {
            try
            {
                ResourceService serviceConf = ((TurbineServices)TurbineServices.getInstance())
                                                         .getResources(JetspeedSecurityService.SERVICE_NAME);
                userClassName = serviceConf.getString(CONFIG_USER_CLASSNAME);                                                             
                userClass = Class.forName(userClassName);
            }
            catch(Exception e)
            {
                throw new UserException(
                    "JetspeedUserFactory: Failed to create a Class object for User implementation: " + e.toString());
            }
        }

        try
        {
            user = (JetspeedUser)userClass.newInstance();
            if (user instanceof BaseJetspeedUser)
            {
                ((BaseJetspeedUser)user).setNew(isNew);
            }            
        }
        catch(Exception e)
        {
            throw new UserException("Failed instantiate an User implementation object: " + e.toString());
        }

        return user;
    }
    

}