defaultlogmodule.java

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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, 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 1.3 2005/05/24 14:30:17 taqua Exp $
 *
 * Changes
 * -------
 * 11-Jul-2003 : Initial version
 * 07-Jun-2004 : Added JCommon header (DG);
 *
 */

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;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.LogTarget;

/**
 * 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()))
    {
      Log.getInstance().addTarget(new PrintStreamLogTarget());
      //Log.getInstance().
      Log.info("System.out log target started ... previous log messages could have been ignored.");
    }
    else if ("true".equals(subSystem.getGlobalConfig().getConfigProperty
            ("org.jfree.base.LogAutoInit")))
    {
      final LogTarget lt = (LogTarget) ObjectUtilities.loadAndInstantiate
              (LogConfiguration.getLogTarget(), this.getClass());
      Log.getInstance().addTarget(lt);
    }
  }
}