/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.naming.factory;

import java.util.Hashtable;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.Name;
import javax.naming.RefAddr;
import javax.naming.spi.ObjectFactory;

import org.apache.naming.EjbRef;

/**
 * Object factory for EJBs.
 */
public class OpenEjbFactory implements ObjectFactory {

    /**
     * Constructs a new OpenEjbFactory.
     */
    public OpenEjbFactory() {
    }

    /**
     * Default OpenEJB factory class name.
     */
    protected static final String DEFAULT_OPENEJB_FACTORY = "org.openejb.client.LocalInitialContextFactory";

    /**
     * Create a new EJB instance using OpenEJB.
     *
     * @param obj         The reference object describing the DataSource
     * @param name        the bound name
     * @param nameCtx     unused
     * @param environment unused
     *
     * @return the object instance
     *
     * @throws Exception if an error occur creating the instance
     */
    @Override
    public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable<?,?> environment)
            throws Exception {

        Object beanObj = null;

        if (obj instanceof EjbRef) {
            EjbRef ref = (EjbRef) obj;

            String factory = DEFAULT_OPENEJB_FACTORY;
            RefAddr factoryRefAddr = ref.get("openejb.factory");
            if (factoryRefAddr != null) {
                // Retrieving the OpenEJB factory
                factory = factoryRefAddr.getContent().toString();
            }

            Properties env = new Properties();
            env.put(Context.INITIAL_CONTEXT_FACTORY, factory);

            RefAddr linkRefAddr = ref.get("openejb.link");
            if (linkRefAddr != null) {
                String ejbLink = linkRefAddr.getContent().toString();
                beanObj = (new InitialContext(env)).lookup(ejbLink);
            }
        }

        return beanObj;
    }
}
