package org.jtheque.core.managers.file.impl;

 /*

  * 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.jtheque.core.managers.file.IFileManager.XmlBackupVersion;

 import org.jtheque.core.managers.file.able.BackupReader;

 import org.jtheque.core.managers.file.able.FileType;

 import org.jtheque.core.managers.file.able.Restorer;

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

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

 import org.jtheque.utils.io.FileException;

 import org.jtheque.utils.io.FileUtils;

 import java.io.File;

 import java.util.Collection;

 /**

  * A Restorer for the XML format.

  *

  * @author Baptiste Wicht

  */

 public final class XMLRestorer implements Restorer {

     @Override

     public void restore(File file, Collection<BackupReader> readers) throws FileException {

         XMLReader reader = new XMLReader();

         try {

             reader.openFile(file);

             if (reader.getRootElement() == null) {

                 throw new FileException("File corrupted (no root element)");

             }

             int version = reader.readInt("./header/file-version", reader.getRootElement());

             if (version != XmlBackupVersion.FIRST.ordinal() && version != XmlBackupVersion.SECOND.ordinal()) {

                 throw new FileException("Unsupported version");

             }

             for (BackupReader r : readers) {

                 r.readBackup(reader.getRootElement());

             }

         } catch (XMLException e) {

             throw new FileException("File corrupted", e);

         } finally {

             FileUtils.close(reader);

         }

     }

     @Override

     public boolean canImportFrom(FileType fileType) {

         return fileType == FileType.XML;

     }

 }