/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "OpenEJB" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of The OpenEJB Group.  For written permission,
 *    please contact openejb-group@openejb.sf.net.
 *
 * 4. Products derived from this Software may not be called "OpenEJB"
 *    nor may "OpenEJB" appear in their names without prior written
 *    permission of The OpenEJB Group. OpenEJB is a registered
 *    trademark of The OpenEJB Group.
 *
 * 5. Due credit should be given to the OpenEJB Project
 *    (http://openejb.sf.net/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENEJB GROUP AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE OPENEJB GROUP OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2002 (C) The OpenEJB Group. All Rights Reserved.
 *
 * $Id: LocalInitialContextFactory.java,v 1.2 2002/10/31 04:39:53 dblevins Exp $
 */
package org.openejb.client;

import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.spi.InitialContextFactory;
import org.openejb.loader.Loader;

/**
 * LocalInitialContextFactory
 * 
 * @author <a href="mailto:david.blevins@visi.com">David Blevins</a>
 * @since 10/5/2002
 */
public class LocalInitialContextFactory implements javax.naming.spi.InitialContextFactory {

    static Context intraVmContext;

    public Context getInitialContext( Hashtable env ) throws javax.naming.NamingException {
        if ( intraVmContext == null ) {
        try { 
                getLoader(env).load(env);
        } catch( Exception e ) {
                throw new  javax.naming.NamingException("Attempted to load OpenEJB. "+e.getMessage());
            }
            intraVmContext = getIntraVmContext( env );
        }
        return intraVmContext;
    }

    private Loader getLoader(Hashtable env) throws Exception {
        Loader loader = null;
        String type = (String)env.get("openejb.loader");

        try{
            if (type == null || type.equals("context")) {
                loader = instantiateLoader("org.openejb.loader.EmbeddingLoader");                
            } else if ( type.equals("embed")) {
                loader = instantiateLoader("org.openejb.loader.EmbeddingLoader");                
            } else if ( type.equals("system")) {
                loader = instantiateLoader("org.openejb.loader.SystemLoader");                
            } else if ( type.equals("bootstrap")) {
                loader = instantiateLoader("org.openejb.loader.SystemLoader");                
            } else if ( type.equals("noload")) {
                loader = instantiateLoader("org.openejb.loader.EmbeddedLoader");                
            } else if ( type.equals("embedded")) {
                loader = instantiateLoader("org.openejb.loader.EmbeddedLoader");                
            } // other loaders here
        } catch (Exception e){
            throw new Exception( "Loader "+type+". "+ e.getMessage() );
        }
        return loader;
    }

    private ClassLoader getClassLoader(){
        try{
            return Thread.currentThread().getContextClassLoader();
        } catch (Exception e){
            //e.printStackTrace();
        }
        return null;
    }

    private Loader instantiateLoader(String loaderName) throws Exception{
        Loader loader = null;
        try{
            ClassLoader cl = getClassLoader();
            Class loaderClass = Class.forName(loaderName, true, cl );
            loader = (Loader)loaderClass.newInstance();
        } catch (Exception e){
            throw new Exception(
                "Could not instantiate the Loader "+loaderName+". Exception "+
                e.getClass().getName()+" "+ e.getMessage());
        } 
        return loader;
    }
    
    
    private Context getIntraVmContext( Hashtable env ) throws javax.naming.NamingException {
        Context context = null;
        try{
            InitialContextFactory factory = null;
            ClassLoader cl = getClassLoader();
            Class ivmFactoryClass = Class.forName( "org.openejb.core.ivm.naming.InitContextFactory", true, cl );
            
            factory = (InitialContextFactory)ivmFactoryClass.newInstance();
            context = factory.getInitialContext( env );
        } catch (Exception e){
            throw new javax.naming.NamingException( 
                "Cannot instantiate an IntraVM InitialContext. Exception: "+
                e.getClass().getName()+" "+ e.getMessage());
        }

        return context;
    }

}

 
