The version of Apache log4j used by SoundHelix.

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CHAINSAW_2_SANDBOX_MERGE :: src / java / org / apache / log4j /

LogManager.java

/*
 * ============================================================================
 *                   The Apache Software License, Version 1.1
 * ============================================================================
 *
 *    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must  retain the above copyright  notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include  the following  acknowledgment:  "This product includes  software
 *    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
 *    Alternately, this  acknowledgment may  appear in the software itself,  if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "log4j" and  "Apache Software Foundation"  must not be used to
 *    endorse  or promote  products derived  from this  software without  prior
 *    written permission. For written permission, please contact
 *    apache@apache.org.
 *
 * 5. Products  derived from this software may not  be called "Apache", nor may
 *    "Apache" appear  in their name,  without prior written permission  of the
 *    Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
 * APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
 * DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
 * ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
 * (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software  consists of voluntary contributions made  by many individuals
 * on  behalf of the Apache Software  Foundation.  For more  information on the
 * Apache Software Foundation, please see <http://www.apache.org/>.
 *
 */

package org.apache.log4j;

import org.apache.log4j.helpers.Loader;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.helpers.OptionConverter;
import org.apache.log4j.spi.DefaultRepositorySelector;
import org.apache.log4j.spi.LoggerFactory;
import org.apache.log4j.spi.LoggerRepository;
import org.apache.log4j.spi.RepositorySelector;
import org.apache.log4j.spi.RootCategory;

import java.net.MalformedURLException;
import java.net.URL;

import java.util.Enumeration;


/**
 * Use the <code>LogManager</code> class to retreive {@link Logger}
 * instances or to operate on the current {@link
 * LoggerRepository}. When the <code>LogManager</code> class is loaded
 * into memory the default initalzation procedure is inititated. The
 * default intialization procedure</a> is described in the <a
 * href="../../../../manual.html#defaultInit">short log4j manual</a>.
 *
 * @author Ceki G&uuml;lc&uuml; */
public class LogManager {
  /**
   * @deprecated This variable is for internal use only. It will
   * become package protected in future versions.
   * */
  public static final String DEFAULT_CONFIGURATION_FILE = "log4j.properties";
  static final String DEFAULT_XML_CONFIGURATION_FILE = "log4j.xml";

  /**
   * @deprecated This variable is for internal use only. It will
   * become private in future versions.
   * */
  public static final String DEFAULT_CONFIGURATION_KEY = "log4j.configuration";

  /**
   * @deprecated This variable is for internal use only. It will
   * become private in future versions.
   * */
  public static final String CONFIGURATOR_CLASS_KEY =
    "log4j.configuratorClass";

  /**
  * @deprecated This variable is for internal use only. It will
  * become private in future versions.
  */
  public static final String DEFAULT_INIT_OVERRIDE_KEY =
    "log4j.defaultInitOverride";
  private static Object guard = null;
  private static RepositorySelector repositorySelector;

  static {
    // By default we use a DefaultRepositorySelector which always returns 'h'.
    Hierarchy h = new Hierarchy(new RootCategory(Level.DEBUG));
    repositorySelector = new DefaultRepositorySelector(h);

    Logger logger = LogManager.getLoggerRepository().getLogger("LOG4J");
    logger.setAdditivity(false);
    logger.addAppender(
      new ConsoleAppender(new PatternLayout("log4j-internal: %r %-22c{2} - %m%n")));

    /** Search for the properties file log4j.properties in the CLASSPATH.  */
    String override =
      OptionConverter.getSystemProperty(DEFAULT_INIT_OVERRIDE_KEY, null);

    // if there is no default init override, then get the resource
    // specified by the user or the default config file.
    if ((override == null) || "false".equalsIgnoreCase(override)) {
      String configurationOptionStr =
        OptionConverter.getSystemProperty(DEFAULT_CONFIGURATION_KEY, null);

      String configuratorClassName =
        OptionConverter.getSystemProperty(CONFIGURATOR_CLASS_KEY, null);

      URL url = null;

      // if the user has not specified the log4j.configuration
      // property, we search first for the file "log4j.xml" and then
      // "log4j.properties"
      if (configurationOptionStr == null) {
        url = Loader.getResource(DEFAULT_XML_CONFIGURATION_FILE);

        if (url == null) {
          url = Loader.getResource(DEFAULT_CONFIGURATION_FILE);
        }
      } else {
        try {
          url = new URL(configurationOptionStr);
        } catch (MalformedURLException ex) {
          // so, resource is not a URL:
          // attempt to get the resource from the class path
          url = Loader.getResource(configurationOptionStr);
        }
      }

      // If we have a non-null url, then delegate the rest of the
      // configuration to the OptionConverter.selectAndConfigure
      // method.
      if (url != null) {
        LogLog.debug(
          "Using URL [" + url + "] for automatic log4j configuration.");
        OptionConverter.selectAndConfigure(
          url, configuratorClassName, LogManager.getLoggerRepository());
      } else {
        LogLog.debug(
          "Could not find resources to perform automatic configuration.");
      }
    }
  }

  /**
     Sets <code>LoggerFactory</code> but only if the correct
     <em>guard</em> is passed as parameter.

     <p>Initally the guard is null.  If the guard is
     <code>null</code>, then invoking this method sets the logger
     factory and the guard. Following invocations will throw a {@link
     IllegalArgumentException}, unless the previously set
     <code>guard</code> is passed as the second parameter.

     <p>This allows a high-level component to set the {@link
     RepositorySelector} used by the <code>LogManager</code>.

     <p>For example, when tomcat starts it will be able to install its
     own repository selector. However, if and when Tomcat is embedded
     within JBoss, then JBoss will install its own repository selector
     and Tomcat will use the repository selector set by its container,
     JBoss.  */
  public static void setRepositorySelector(
    RepositorySelector selector, Object guard) throws IllegalArgumentException {
    if ((LogManager.guard != null) && (LogManager.guard != guard)) {
      throw new IllegalArgumentException(
        "Attempted to reset the LoggerFactory without possessing the guard.");
    }

    if (selector == null) {
      throw new IllegalArgumentException(
        "RepositorySelector must be non-null.");
    }

    LogManager.guard = guard;
    LogManager.repositorySelector = selector;
  }

  public static LoggerRepository getLoggerRepository() {
    return repositorySelector.getLoggerRepository();
  }

  /**
     Retrieve the appropriate root logger.
   */
  public static Logger getRootLogger() {
    // Delegate the actual manufacturing of the logger to the logger repository.
    return repositorySelector.getLoggerRepository().getRootLogger();
  }

  /**
     Retrieve the appropriate {@link Logger} instance.
  */
  public static Logger getLogger(String name) {
    // Delegate the actual manufacturing of the logger to the logger repository.
    return repositorySelector.getLoggerRepository().getLogger(name);
  }

  /**
      Retrieve the appropriate {@link Logger} instance.
   */
  public static Logger getLogger(Class clazz) {
    // Delegate the actual manufacturing of the logger to the logger repository.
    return repositorySelector.getLoggerRepository().getLogger(clazz.getName());
  }

  /**
     Retrieve the appropriate {@link Logger} instance.
  */
  public static Logger getLogger(String name, LoggerFactory factory) {
    // Delegate the actual manufacturing of the logger to the logger repository.
    return repositorySelector.getLoggerRepository().getLogger(name, factory);
  }

  public static Logger exists(String name) {
    return repositorySelector.getLoggerRepository().exists(name);
  }

  public static Enumeration getCurrentLoggers() {
    return repositorySelector.getLoggerRepository().getCurrentLoggers();
  }

  public static void shutdown() {
    repositorySelector.getLoggerRepository().shutdown();
  }

  public static void resetConfiguration() {
    repositorySelector.getLoggerRepository().resetConfiguration();
  }
}
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