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/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.xwiki.classloader.internal;

import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.slf4j.Logger;
import org.xwiki.classloader.ExtendedURLStreamHandler;
import org.xwiki.component.annotation.Component;
import org.xwiki.component.manager.ComponentLookupException;
import org.xwiki.component.manager.ComponentManager;

/**
 * Stream handler factory that uses components to lookup stream handler for protocols.
 *
 * @version $Id: 82b060c9a138eb3bca6dbf293890f9ba677de0bc $
 * @since 2.0.1
 */
@Component(roles = {URLStreamHandlerFactory.class})
@Singleton
public class ExtendedURLStreamHandlerFactory implements URLStreamHandlerFactory
{
    /**
     * To dynamically lookup stream handler components.
     */
    @Inject
    private ComponentManager componentManager;

    @Inject
    private Logger logger;

    @Override
    public URLStreamHandler createURLStreamHandler(String protocol)
    {
        if (this.componentManager.hasComponent(ExtendedURLStreamHandler.class, protocol)) {
            try {
                return this.componentManager.getInstance(ExtendedURLStreamHandler.class, protocol);
            } catch (ComponentLookupException e) {
                this.logger.error("Failed to lookup ExtendedURLStreamHandler or protocol [{}]", protocol, e);
            }
        }

        // No special protocol handler found, return null since code using this factory
        // should know how to deal when no protocol handler is found.
        return null;
    }
}