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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.

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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * ---------------------
 * DefaultLogModule.java
 * ---------------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: DefaultLogModule.java,v 1.8 2005/12/18 23:29:18 taqua Exp $
 *
 * Changes
 * -------
 * 11-Jul-2003 : Initial version
 * 07-Jun-2004 : Added JCommon header (DG);
 * 25-Nov-2005 : The initialization was overly complicated. There is only
 *               one logtarget here, and additional targets should create
 *               an dependent module.
 */

package org.jfree.base.log;

import org.jfree.base.modules.AbstractModule;
import org.jfree.base.modules.ModuleInitializeException;
import org.jfree.base.modules.SubSystem;
import org.jfree.util.Log;
import org.jfree.util.PrintStreamLogTarget;

/**
 * The module definition for the System.out-Logging. This is the default log
 * implementation and is provided to insert the logging initialisation in the
 * module loading process.
 *
 * @author Thomas Morgner
 */
public class DefaultLogModule extends AbstractModule
{
  /**
   * DefaultConstructor. Loads the module specification.
   *
   * @throws ModuleInitializeException if an error occured.
   */
  public DefaultLogModule() throws ModuleInitializeException
  {
    loadModuleInfo();
  }

  /**
   * Initalizes the module. This method initializes the logging system, if the
   * System.out logtarget is selected.
   *
   * @param subSystem the sub-system.
   * @throws ModuleInitializeException if an error occured.
   */
  public void initialize(final SubSystem subSystem)
          throws ModuleInitializeException
  {
    if (LogConfiguration.isDisableLogging())
    {
      return;
    }

    if (LogConfiguration.getLogTarget().equals
            (PrintStreamLogTarget.class.getName()))
    {
      DefaultLog.installDefaultLog();
      Log.getInstance().addTarget(new PrintStreamLogTarget());

      if ("true".equals(subSystem.getGlobalConfig().getConfigProperty
              ("org.jfree.base.LogAutoInit")))
      {
        Log.getInstance().init();
      }
      Log.info("Default log target started ... previous log messages " +
              "could have been ignored.");
    }
  }
}