package org.jtheque.core.managers.update.repository;

 /*

  * This file is part of JTheque.

  *

  * JTheque 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.

  *

  * JTheque 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 JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import org.jdom.Element;

 import org.jtheque.core.managers.Managers;

 import org.jtheque.core.managers.log.ILoggingManager;

 import org.jtheque.core.utils.file.XMLException;

 import org.jtheque.core.utils.file.XMLReader;

 import org.jtheque.utils.StringUtils;

 import org.jtheque.utils.bean.InternationalString;

 import org.jtheque.utils.bean.Version;

 import org.jtheque.utils.io.FileUtils;

 /**

  * A reader for repository XML file.

  *

  * @author Baptiste Wicht

  */

 public final class RepositoryReader {

     private final Repository repository;

     private final XMLReader reader;

     /**

      * Construct a new RepositoryReader.

      */

     public RepositoryReader() {

         super();

         repository = new Repository();

         reader = new XMLReader();

     }

     /**

      * Read a repository file.

      *

      * @param strUrl The URL of the repository file.

      * @return The repository.

      */

     public Repository read(String strUrl) {

         try {

             reader.openURL(strUrl);

             read();

         } catch (XMLException e) {

             Managers.getManager(ILoggingManager.class).getLogger(getClass()).error(e, "Unable to get information from repository");

         } finally {

             FileUtils.close(reader);

         }

         return repository;

     }

     /**

      * Read all the informations from the reader.

      *

      * @throws XMLException If an error occurs during the XML reading process.

      */

     private void read() throws XMLException {

         readTitle(reader);

         readApplication(reader);

         readModules(reader);

     }

     /**

      * Read the application informations from the reader.

      *

      * @param reader The reader to use.

      * @throws XMLException If an error occurs during the XML reading process.

      */

     private void readApplication(XMLReader reader) throws XMLException {

         repository.setApplication(reader.readString("application", reader.getRootElement()));

     }

     /**

      * Read the modules informations from the reader.

      *

      * @param reader The reader to use.

      * @throws XMLException If an error occurs during the XML reading process.

      */

     private void readModules(XMLReader reader) throws XMLException {

         for (Object currentNode : reader.getNodes("modules/module", reader.getRootElement())) {

             ModuleDescription module = new ModuleDescription();

             module.setId(reader.readString("id", currentNode));

             module.setName(reader.readString("name", currentNode));

             if (StringUtils.isEmpty(reader.readString("core", currentNode))) {

                 module.setCoreVersion(Managers.getCore().getCoreCurrentVersion());

             } else {

                 module.setCoreVersion(new Version(reader.readString("core", currentNode)));

             }

             module.setVersionsFileURL(reader.readString("versions", currentNode));

             Element descriptionElement = reader.getNode("description", currentNode);

             InternationalString description = new InternationalString();

             for (Object child : descriptionElement.getChildren()) {

                 Element childElement = (Element) child;

                 description.put(childElement.getName(), childElement.getValue());

             }

             module.setDescription(description);

             repository.getModules().add(module);

         }

     }

     /**

      * Read the title of the repository from the reader.

      *

      * @param reader The reader to use.

      * @throws XMLException If an error occurs during the XML reading process.

      */

     private void readTitle(XMLReader reader) throws XMLException {

         InternationalString title = new InternationalString();

         Element titleElement = reader.getNode("title", reader.getRootElement());

         for (Object child : titleElement.getChildren()) {

             Element childElement = (Element) child;

             title.put(childElement.getName(), childElement.getValue());

         }

         repository.setTitle(title);

     }

 }