content: /**
   *  Licensed to the Apache Software Foundation (ASF) under one or more
   *  contributor license agreements.  See the NOTICE file distributed with
   *  this work for additional information regarding copyright ownership.
   *  The ASF licenses this file to You under the Apache License, Version 2.0
   *  (the "License"); you may not use this file except in compliance with
   *  the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package org.apache.aries.jmx;
  
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.ServiceReference;
  import org.osgi.service.log.LogService;
  import org.osgi.util.tracker.ServiceTracker;
  
  /**
   * <p>This <tt>Logger</tt> class represents ServiceTracker for LogService. 
   * It provides methods for logging messages. If LogService is not available it logs to stdout.</p>
   * 
   * @see org.osgi.service.log.LogService
   * @see org.osgi.util.tracker.ServiceTracker
   * @version $Rev$ $Date$
   */
  @SuppressWarnings("rawtypes")
  public class Logger extends ServiceTracker implements LogService {
      
      /**
       * Constructs new Logger(ServiceTracker for LogService).
       * 
       * @param context bundle context.
       */
      @SuppressWarnings("unchecked")
  	public Logger(BundleContext context) {
          super(context, LogService.class.getName(), null);
      }
  
      /**
       * @see org.osgi.service.log.LogService#log(int, java.lang.String)
       */
      public void log(int level, String message) {
          LogService logService = (LogService) getService();
          if (logService != null) {
              logService.log(level, message);
          }
  
      }
  
      /**
       * @see org.osgi.service.log.LogService#log(int, java.lang.String, java.lang.Throwable)
       */
      public void log(int level, String message, Throwable exception) {
          LogService logService = (LogService) getService();
          if (logService != null) {
              logService.log(level, message, exception);
          }
      }
  
      /**
       * @see org.osgi.service.log.LogService#log(org.osgi.framework.ServiceReference, int, java.lang.String)
       */
      public void log(ServiceReference ref, int level, String message) {
          LogService logService = (LogService) getService();
          if (logService != null) {
              logService.log(ref, level, message);
          }
      }
  
      /**
       * @see org.osgi.service.log.LogService#log(org.osgi.framework.ServiceReference, int, java.lang.String,
       *      java.lang.Throwable)
       */
      public void log(ServiceReference ref, int level, String message, Throwable exception) {
          LogService logService = (LogService) getService();
          if (logService != null) {
              logService.log(ref, level, message, exception);
          }
      }
  
  }
  