/*
 * $Header: /cvsroot/mvnforum/myvietnam/src/net/myvietnam/mvncore/web/FileUploadParserFactory.java,v 1.2 2006/04/14 16:03:56 minhnn Exp $
 * $Author: minhnn $
 * $Revision: 1.2 $
 * $Date: 2006/04/14 16:03:56 $
 *
 * ====================================================================
 *
 * Copyright (C) 2002-2006 by MyVietnam.net
 *
 * All copyright notices regarding MyVietnam and MyVietnam CoreLib
 * MUST remain intact in the scripts and source code.
 *
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Correspondence and Marketing Questions can be sent to:
 * info at MyVietnam net
 *
 * @author: Minh Nguyen
 */
package net.myvietnam.mvncore.web;

import net.myvietnam.mvncore.MVNCoreConfig;
import net.myvietnam.mvncore.web.impl.FileUploadParserServletImpl;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class FileUploadParserFactory {

    private static Log log = LogFactory.getLog(FileUploadParserFactory.class);

    private static FileUploadParser uploadParser = null;

    /**
     * Private constructor to prevent instantiation
     */
    private FileUploadParserFactory() {
    }

    public static FileUploadParser getFileUploadParser() {

        if (uploadParser == null) {
            String uploadParserClassName = MVNCoreConfig.getUploadParserClassName();
            try {
                if (uploadParserClassName.length() > 0) {
                    Class urlResolverClass = Class.forName(uploadParserClassName);
                    uploadParser = (FileUploadParser) urlResolverClass.newInstance();
                }
            } catch (Throwable ex) {
                log.error("Cannot load FileUploadParser implementation (" + uploadParserClassName + ")", ex);
            }

            // fallback, now use the default implementation
            if (uploadParser == null) {
                uploadParser = new FileUploadParserServletImpl();
            }

            log.info("Using FileUploadParser = " + uploadParser);
        }

        return uploadParser;
    }

}