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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart
There is a newer version: 1.5.9
/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, DefaultLog.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */

package org.jfree.base.log;

import org.jfree.util.Log;
import org.jfree.util.LogTarget;
import org.jfree.util.PrintStreamLogTarget;

/**
 * A default log implementation. The Log class defines how to create Logger-contexts
 * and how to forward messages to the logtargets.
 *
 * @author Thomas Morgner
 */
public class DefaultLog extends Log {

    /** The default log target. */
    private static final PrintStreamLogTarget DEFAULT_LOG_TARGET =
          new PrintStreamLogTarget();

    /** The default log instance. */
    private static final DefaultLog defaultLogInstance;

    /**
     * Creates a new log.
     */
    protected DefaultLog () {
        // nothing required
    }

    static {
        defaultLogInstance = new DefaultLog();
        defaultLogInstance.addTarget(DEFAULT_LOG_TARGET);
        try {
            // check the system property. This is the developers backdoor to activate
            // debug output as soon as possible.
          final String property = System.getProperty("org.jfree.DebugDefault", "false");
          if (Boolean.valueOf(property).booleanValue()) {
              defaultLogInstance.setDebuglevel(LogTarget.DEBUG);
          }
          else {
              defaultLogInstance.setDebuglevel(LogTarget.WARN);
          }
        }
        catch (SecurityException se) {
            defaultLogInstance.setDebuglevel(LogTarget.WARN);
        }
    }

    /**
     * Initializes the log system after the log module was loaded and a log target
     * was defined. This is the second step of the log initialisation.
     */
    public void init() {
        removeTarget(DEFAULT_LOG_TARGET);
        final String logLevel = LogConfiguration.getLogLevel();
        if (logLevel.equalsIgnoreCase("error")) {
            setDebuglevel(LogTarget.ERROR);
        }
        else if (logLevel.equalsIgnoreCase("warn")) {
            setDebuglevel(LogTarget.WARN);
        }
        else if (logLevel.equalsIgnoreCase("info")) {
            setDebuglevel(LogTarget.INFO);
        }
        else if (logLevel.equalsIgnoreCase("debug")) {
            setDebuglevel(LogTarget.DEBUG);
        }
    }

    /**
     * Adds a log target to this facility. Log targets get informed, via the
     * LogTarget interface, whenever a message is logged with this class.
     *
     * @param target the target.
     */
    public synchronized void addTarget(final LogTarget target)
    {
      super.addTarget(target);
      // as soon as there is a real log target added, we do no longer need
      // the default logging. This was only installed to be able to send messages
      // if the deepest basic logging failed.
      if (target != DEFAULT_LOG_TARGET) {
          removeTarget(DEFAULT_LOG_TARGET);
      }
    }

  /**
     * Returns the default log.
     * 
     * @return The default log.
     */
    public static DefaultLog getDefaultLog() {
        return defaultLogInstance;
    }

    /**
     * Makes this implementation the default instance.
     */
    public static void installDefaultLog () {
      Log.defineLog(defaultLogInstance);
    }
}