A simple wrapper around JDK logging facilities : Log « Language Basics « Java






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A simple wrapper around JDK logging facilities

   
/***
 *    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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *    Project: www.simpledbm.org
 *    Author : Dibyendu Majumdar
 *    Email  : dibyendu@mazumdar.demon.co.uk
 */

import java.io.FileInputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.LogManager;

/**
 * A simple wrapper around JDK logging facilities. The aim is to allow 
 * easy switch to another logging system, such as Log4J.
 * 
 * @author Dibyendu Majumdar
 */
public final class Logger {
  
  /**
   * Instance of the real logger object.
   */
  private final java.util.logging.Logger realLogger;
  
  /**
   * Obtain a new or existing Logger instance. 
   * @param name Name of the logger, package names are recommended
   */
  public static Logger getLogger(String name) {
    return new Logger(name);
  }
  
  public static void configure(String filename) {
    FileInputStream is = null; 
    try {
      is = new FileInputStream(filename);
      LogManager.getLogManager().readConfiguration(is);
    }
    catch (Exception e) {
      System.err.println("SIMPLEDBM-ERROR: Failed to initialize logging system due to following error: " + e.getMessage());
      e.printStackTrace();
    }
    finally {
      try {
        is.close();
      } catch (IOException e) {}
    }
  }
  
  public Logger(String name) {
    realLogger = java.util.logging.Logger.getLogger(name);
  }
  
  public void info(String sourceClass, String sourceMethod, String message) {
    realLogger.logp(Level.INFO, sourceClass, sourceMethod, message);
  }
  
  public void info(String sourceClass, String sourceMethod, String message, Throwable thrown) {
    realLogger.logp(Level.INFO, sourceClass, sourceMethod, message, thrown);
  }
  
  public void debug(String sourceClass, String sourceMethod, String message) {
    realLogger.logp(Level.FINE, sourceClass, sourceMethod, message);
  }
  
  public void debug(String sourceClass, String sourceMethod, String message, Throwable thrown) {
    realLogger.logp(Level.FINE, sourceClass, sourceMethod, message, thrown);
  }

  public void trace(String sourceClass, String sourceMethod, String message) {
    realLogger.logp(Level.FINER, sourceClass, sourceMethod, message);
  }
  
  public void trace(String sourceClass, String sourceMethod, String message, Throwable thrown) {
    realLogger.logp(Level.FINER, sourceClass, sourceMethod, message, thrown);
  }
  
  public void warn(String sourceClass, String sourceMethod, String message) {
    realLogger.logp(Level.WARNING, sourceClass, sourceMethod, message);
  }
  
  public void warn(String sourceClass, String sourceMethod, String message, Throwable thrown) {
    realLogger.logp(Level.WARNING, sourceClass, sourceMethod, message, thrown);
  }

  public void error(String sourceClass, String sourceMethod, String message) {
    realLogger.logp(Level.SEVERE, sourceClass, sourceMethod, message);
  }

  public void error(String sourceClass, String sourceMethod, String message, Throwable thrown) {
    realLogger.logp(Level.SEVERE, sourceClass, sourceMethod, message, thrown);
  }
  
  public boolean isTraceEnabled() {
    return realLogger.isLoggable(Level.FINER);
  }

  public boolean isDebugEnabled() {
    return realLogger.isLoggable(Level.FINE);
  }
  
  public void enableDebug() {
    realLogger.setLevel(Level.FINE);
  }

  public void disableDebug() {
    realLogger.setLevel(Level.INFO);
  }

}








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