package org.jtheque.core.managers.log;

 import org.apache.log4j.Appender;

 import org.apache.log4j.ConsoleAppender;

 import org.apache.log4j.Layout;

 import org.apache.log4j.Level;

 import org.apache.log4j.Logger;

 import org.apache.log4j.PatternLayout;

 import org.apache.log4j.RollingFileAppender;

 import org.jtheque.core.managers.Managers;

 import org.jtheque.core.utils.SystemProperty;

 /*

  * 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/>.

  */

 /**

  * @author Baptiste Wicht

  */

 public final class Log4JConfigurator {

     private static final RollingFileAppender FILE_APPENDER = new RollingFileAppender();

     private static final String MAX_FILE_SIZE = "500KB";

     /**

      * This is an utility class, not instanciable.

      */

     private Log4JConfigurator() {

         super();

     }

     /**

      * Configure Log4J.

      */

     public static void configure() {

         System.setProperty("log4j.defaultInitOverride", "true");

         PatternLayout layout = new PatternLayout();

         layout.setConversionPattern("%d{ABSOLUTE} %5p %c{1}:%L - %m%n");

         addConsoleAppender(layout);

         addFileAppender(FILE_APPENDER, Managers.getCore().getFiles().getLogsFile().getAbsolutePath(), layout);

         String level = "ERROR";

         if (Managers.getCore().getApplication().getProperty("jtheque.log") != null) {

             level = Managers.getCore().getApplication().getProperty("jtheque.log");

         } else if (SystemProperty.JTHEQUE_LOG.get() != null) {

             level = SystemProperty.JTHEQUE_LOG.get();

         }

         Logger.getRootLogger().setLevel(Level.toLevel(level));

     }

     /**

      * Add a console appender.

      *

      * @param layout The layout of the appender.

      */

     private static void addConsoleAppender(Layout layout) {

         ConsoleAppender console = new ConsoleAppender();

         console.setTarget("System.out");

         console.setLayout(layout);

         console.activateOptions();

         Logger.getRootLogger().addAppender(console);

     }

     /**

      * Add a file appender.

      *

      * @param file     The file appender.

      * @param filePath The file path.

      * @param layout   The layout of the appender.

      */

     private static void addFileAppender(RollingFileAppender file, String filePath, Layout layout) {

         file.setAppend(true);

         file.setBufferedIO(true);

         file.setFile(filePath);

         file.setLayout(layout);

         file.setMaxBackupIndex(10);

         file.setMaxFileSize(MAX_FILE_SIZE);

         file.activateOptions();

         Logger.getRootLogger().addAppender(file);

     }

     /**

      * Close Log4J.

      */

     public static void close() {

         removeAndCloseAppender(FILE_APPENDER);

     }

     /**

      * Remove and close an appender.

      *

      * @param appender The appender to close and remove.

      */

     private static void removeAndCloseAppender(Appender appender) {

         if (appender != null) {

             appender.close();

             Logger.getRootLogger().removeAppender(appender);

         }

     }

 }