Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.i18n;

import java.io.File;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;

import java.util.List;

import java.util.StringTokenizer;

/**

 * <p>This class offers a class loader which is able to load files from the specified

 * directories.</p>

 * 

 * @author C?sar Mart?nez Izquierdo (cesar.martinez@iver.es)

 *

 */

public class MessagesClassLoader extends URLClassLoader {

        /**

         * <p>Creates a new class loader, which is able to load files from the directories

         * specified as parameter.</p>

         * 

         * @param urls The list of directories which will be used to load files.

         */

        public MessagesClassLoader(URL[] urls) {

                super(urls);

        }

        /**

         * Loads a resource using the specified file name.

         * 

         * @param res The name of the resource to be loaded.

         */

        public URL getResource(String res) {

                try {

                        ArrayList resource = new ArrayList();

                        StringTokenizer st = new StringTokenizer(res, "\\/");

                        while (st.hasMoreTokens()) {

                                String token = st.nextToken();

                                resource.add(token);

                        }

                        URL ret = null;

                        int currentUrl;

                        URL[] urls = getURLs();

                        for (currentUrl=0; currentUrl< urls.length; currentUrl++) {

                                URL url = urls[currentUrl];

                                File file = new File(url.getFile());

                                if (url.getFile().endsWith("/"))

                                        ret = getResource(file, resource);

                        }

                        if (ret != null) {

                                return ret;

                        }

                } catch (Exception e) {

                        e.printStackTrace();

                }

                return super.getResource(res);

        }

        /**

         * Busca recursivamente el recurso res en el directorio base. res es una

         * lista de String's con los directorios del path y base es el directorio

         * a partir del cual se busca dicho recurso. En cada ejecuci?n del m?todo

         * se toma el primer elemento de res y se busca dicho directorio en el

         * directorio base. Si se encuentra, ser? el directorio base para una

         * nueva llamada.

         *

         * @param base Directorio desde donde parte la b?squeda del recurso.

         * @param res Lista de strings con el path del recurso que se quiere

         *        encontrar

         *

         * @return URL con el recurso

         */

        private URL getResource(File base, List res) {

                File[] files = base.listFiles();

                String parte = (String) res.get(0);

                for (int i = 0; i < files.length; i++) {

                        if (files[i].getName().compareTo(parte) == 0) {

                                if (res.size() == 1) {

                                        try {

                                                return new URL("file:" + files[i].toString());

                                        } catch (MalformedURLException e) {

                                                return null;

                                        }

                                } else {

                                        return getResource(files[i], res.subList(1, res.size()));

                                }

                        }

                }

                return null;

        }

}