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/**
 *  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.geronimo.webservices.jaxr;

import javax.xml.registry.ConnectionFactory;
import javax.xml.registry.JAXRException;

import org.apache.geronimo.gbean.GBeanInfo;
import org.apache.geronimo.gbean.GBeanInfoBuilder;
import org.apache.geronimo.gbean.annotation.GBean;
import org.apache.geronimo.gbean.annotation.OsgiService;
import org.apache.geronimo.gbean.annotation.ParamAttribute;
import org.apache.geronimo.gbean.annotation.ParamSpecial;
import org.apache.geronimo.gbean.annotation.SpecialAttributeType;
import org.apache.geronimo.j2ee.j2eeobjectnames.NameFactory;
import org.apache.geronimo.naming.ResourceSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Simple GBean to provide access to a JAXR ConnectionFactory
 *
 * @version $Rev: 1051895 $ $Date: 2010-12-22 21:46:07 +0800 (Wed, 22 Dec 2010) $
 */
@GBean(j2eeType = NameFactory.JAXR_CONNECTION_FACTORY)
@OsgiService
public class JAXRGBean implements ResourceSource
{
    private static final Logger log = LoggerFactory.getLogger(JAXRGBean.class);

    private final ClassLoader cl;
    private final String connectionFactoryClass;

    public JAXRGBean(@ParamAttribute(name="connectionFactoryClass")String connectionFactoryClass,
                     @ParamSpecial(type = SpecialAttributeType.classLoader)ClassLoader cl) {
        this.cl = cl;
        this.connectionFactoryClass = connectionFactoryClass;
    }

    /**
     * Returns a fresh, new implementation of javax.xml.registry.ConnectionFactory
     *
     * @return ConnectionFactory
     */
    public Object $getResource() {
        if (connectionFactoryClass != null) {
            System.setProperty("javax.xml.registry.ConnectionFactoryClass", connectionFactoryClass);
            //TODO consider whether we should bypass the code below and just construct it ourselves, like it does.
        }
        Thread currentThread = Thread.currentThread();
        ClassLoader oldCl = currentThread.getContextClassLoader();
        currentThread.setContextClassLoader(cl);
        try {
            return ConnectionFactory.newInstance();
        } catch (JAXRException e) {
            log.error("Error creating ConnectionFactory", e);
        } finally {
            currentThread.setContextClassLoader(oldCl);
        }

        return null;
    }

}