New working version after Victoria trip - fix a typo

/**_____________________________________________________________________________

 *

 *                                 OATS - INAF

 *  Osservatorio Astronomico di Tireste - Istituto Nazionale di Astrofisica

 *  Astronomical Observatory of Trieste - National Institute for Astrophysics

 * ____________________________________________________________________________

 *

 * Copyright (C) 20016  Istituto Nazionale di Astrofisica

 * 

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software Foundation, Inc., 

 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 * _____________________________________________________________________________

 **/

package it.inaf.oats.vospacebackend.implementation;

import org.apache.log4j.Logger;

import it.inaf.oats.vospacebackend.exceptions.ExceptionMessage;

import it.inaf.oats.vospacebackend.exceptions.VOSpaceBackendException;

import it.inaf.oats.vospacebackend.utils.ConfigReader;

import java.text.MessageFormat;

public class VOSpaceBackendImplFactory {

    private static final String CONFIG_FILE_NAME = "VOSpace.properties";

    private static final Logger log = Logger.getLogger(VOSpaceBackendImplFactory.class);

    private static String VOSpaceBackImplName = new String();

    public VOSpaceBackendImplFactory() throws VOSpaceBackendException {

        ConfigReader myConf = null;

        try {

            myConf = new ConfigReader(CONFIG_FILE_NAME);  

        } catch (Exception e) {

            ExceptionMessage exMsg = new ExceptionMessage();

            log.debug(MessageFormat.format(exMsg.getMessage("UNABLE_TO_READ_PROPERTIES"), CONFIG_FILE_NAME));

            throw new VOSpaceBackendException(                   

               MessageFormat.format(exMsg.getMessage("UNABLE_TO_READ_PROPERTIES"), CONFIG_FILE_NAME));

        }

        try {       

            this.VOSpaceBackImplName = myConf.getProperty("it.inaf.oats.vospacebackend.implementation.VOSpaceBackendImpl");     

        } catch (Exception e) {     

            ExceptionMessage exMsg = new ExceptionMessage();

            log.debug(MessageFormat.format(

                       exMsg.getMessage("PROPERTY_NOT_FOUND"), 

                                        "it.inaf.oats.vospacebackend.implementation.VOSpaceBackendImpl", 

                                        CONFIG_FILE_NAME));

            throw new VOSpaceBackendException(

               MessageFormat.format(

                       exMsg.getMessage("PROPERTY_NOT_FOUND"), 

                                        "it.inaf.oats.vospacebackend.implementation.VOSpaceBackendImpl", 

                                        CONFIG_FILE_NAME));            

        }

    }

    public VOSpaceBackend getVOSpaceBackImpl() throws VOSpaceBackendException {

        log.debug("Try to get object: " + this.VOSpaceBackImplName);

        return (VOSpaceBackend)this.buildObject(this.VOSpaceBackImplName);

    }

    private Object buildObject(String myBackendImpl) throws VOSpaceBackendException {

        Object result = null;

        try {

            //note that, with this style, the implementation needs to have a

            //no-argument constructor!

            Class implClass = Class.forName(myBackendImpl);

            result = implClass.newInstance();

        } catch (ClassNotFoundException ex) {

            log.debug("CLASS_NOT_FOUND");

            ExceptionMessage exMsg = new ExceptionMessage();

            throw new VOSpaceBackendException(MessageFormat.format(exMsg.getMessage("CLASS_NOT_FOUND"), myBackendImpl));

        } catch (InstantiationException ex) {

            log.debug("UNABLE_TO_INSTANTIATE");

            ExceptionMessage exMsg = new ExceptionMessage();

            throw new VOSpaceBackendException(MessageFormat.format(exMsg.getMessage("UNABLE_TO_INSTANTIATE"), myBackendImpl));

        } catch (IllegalAccessException ex) {

            log.debug("UNABLE_TO_ACCESS");

            ExceptionMessage exMsg = new ExceptionMessage();

            throw new VOSpaceBackendException(MessageFormat.format(exMsg.getMessage("UNABLE_TO_ACCESS"), myBackendImpl));

        }

        return result;

    }    

}