2009/05/20 - Apache Shale has been retired.

   /*
    * 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.shale.remoting.logger;
  
  import org.apache.shale.remoting.logger.Logger;
  
  /***
   * <p>Default {@link Logger} implementation that delegates to Apache Commons
   * Logging (if present), or JDK <code>java.util.Logging</code> (if present),
   * or simply writes to <code>System.out</code>.</p>
   */
  public class DefaultLogger extends AbstractLogger {
  
  
      // ------------------------------------------------------------ Constructors
  
  
      /***
       * <p>Construct a new DefaultLogger instance, deciding which
       * {@link Logger} implementation, if any, we should delegate to.</p>
       */
      public DefaultLogger() {
  
          ClassLoader loader = Thread.currentThread().getContextClassLoader();
  
          // Delegate to Apache Commons Logging if possible
          try {
              Class clazz = loader.loadClass("org.apache.shale.remoting.logger.CommonsLogger");
              this.logger = (Logger) clazz.newInstance();
              return;
          } catch (Exception e) {
              ; // Fall through
          }
  
          // Delegate to JDK java.util.logging Logging if possible
          try {
              Class clazz = loader.loadClass("org.apache.shale.remoting.logger.JdkLogger");
              this.logger = (Logger) clazz.newInstance();
              return;
          } catch (Exception e) {
              ; // Fall through
          }
  
          // We will do the logging stuff ourself
  
      }
  
  
      // ------------------------------------------------------ Instance Variables
  
  
      /***
       * <p>The {@link Logger} instance we should delegate to (if any).</p>
       */
      protected Logger logger = null;
  
  
      // ------------------------------------------------------ Condition Checking
  
  
      /*** {@inheritDoc} */
      public boolean isTraceEnabled(String name) {
          if (logger != null) {
              return logger.isTraceEnabled(name);
          }
          return false;
      }
  
  
      /*** {@inheritDoc} */
      public boolean isDebugEnabled(String name) {
          if (logger != null) {
              return logger.isDebugEnabled(name);
          }
          return false;
      }
  
  
      /*** {@inheritDoc} */
      public boolean isInfoEnabled(String name) {
          if (logger != null) {
              return logger.isInfoEnabled(name);
          }
          return false;
     }
 
 
     /*** {@inheritDoc} */
     public boolean isWarnEnabled(String name) {
         if (logger != null) {
             return logger.isWarnEnabled(name);
         }
         return false;
     }
 
 
     /*** {@inheritDoc} */
     public boolean isErrorEnabled(String name) {
         if (logger != null) {
             return logger.isErrorEnabled(name);
         }
         return false;
     }
 
 
     /*** {@inheritDoc} */
     public boolean isFatalEnabled(String name) {
         if (logger != null) {
             return logger.isFatalEnabled(name);
         }
         return false;
     }
 
 
     // ------------------------------------------------------------- Log Methods
 
 
     /*** {@inheritDoc} */
     public void trace(String name, String message,
                       Throwable exception, Object[] params) {
         if (logger != null) {
             trace(name, message, exception, params);
             return;
         }
         System.out.println("TRACE: " + message(message, params));
         if (exception != null) {
             exception.printStackTrace(System.out);
         }
     }
 
 
     /*** {@inheritDoc} */
     public void debug(String name, String message,
                       Throwable exception, Object[] params) {
         if (logger != null) {
             debug(name, message, exception, params);
             return;
         }
         System.out.println("DEBUG: " + message(message, params));
         if (exception != null) {
             exception.printStackTrace(System.out);
         }
     }
 
 
     /*** {@inheritDoc} */
     public void info(String name, String message,
                      Throwable exception, Object[] params) {
         if (logger != null) {
             info(name, message, exception, params);
             return;
         }
         System.out.println("INFO: " + message(message, params));
         if (exception != null) {
             exception.printStackTrace(System.out);
         }
     }
 
 
     /*** {@inheritDoc} */
     public void warn(String name, String message,
                      Throwable exception, Object[] params) {
         if (logger != null) {
             warn(name, message, exception, params);
             return;
         }
         System.out.println("WARN: " + message(message, params));
         if (exception != null) {
             exception.printStackTrace(System.out);
         }
     }
 
 
     /*** {@inheritDoc} */
     public void error(String name, String message,
                       Throwable exception, Object[] params) {
         if (logger != null) {
             error(name, message, exception, params);
             return;
         }
         System.out.println("ERROR: " + message(message, params));
         if (exception != null) {
             exception.printStackTrace(System.out);
         }
     }
 
 
     /*** {@inheritDoc} */
     public void fatal(String name, String message,
                       Throwable exception, Object[] params) {
         if (logger != null) {
             fatal(name, message, exception, params);
             return;
         }
         System.out.println("FATAL: " + message(message, params));
         if (exception != null) {
             exception.printStackTrace(System.out);
         }
     }
 
 
 }