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   /*
    * Copyright 2016 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.util.internal.logging;
  
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Logger;
  import org.apache.logging.log4j.spi.ExtendedLogger;
  import org.apache.logging.log4j.spi.ExtendedLoggerWrapper;
  
  import java.security.AccessController;
  import java.security.PrivilegedAction;
  
  import static io.netty.util.internal.logging.AbstractInternalLogger.EXCEPTION_MESSAGE;
  
  class Log4J2Logger extends ExtendedLoggerWrapper implements InternalLogger {
  
      private static final long serialVersionUID = 5485418394879791397L;
      private static final boolean VARARGS_ONLY;
  
      static {
          // Older Log4J2 versions have only log methods that takes the format + varargs. So we should not use
          // Log4J2 if the version is too old.
          // See https://github.com/netty/netty/issues/8217
          VARARGS_ONLY = AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
              @Override
              public Boolean run() {
                  try {
                      Logger.class.getMethod("debug", String.class, Object.class);
                      return false;
                  } catch (NoSuchMethodException ignore) {
                      // Log4J2 version too old.
                      return true;
                  } catch (SecurityException ignore) {
                      // We could not detect the version so we will use Log4J2 if its on the classpath.
                      return false;
                  }
              }
          });
      }
  
      Log4J2Logger(Logger logger) {
          super((ExtendedLogger) logger, logger.getName(), logger.getMessageFactory());
          if (VARARGS_ONLY) {
              throw new UnsupportedOperationException("Log4J2 version mismatch");
          }
      }
  
      @Override
      public String name() {
          return getName();
      }
  
      @Override
      public void trace(Throwable t) {
          log(Level.TRACE, EXCEPTION_MESSAGE, t);
      }
  
      @Override
      public void debug(Throwable t) {
          log(Level.DEBUG, EXCEPTION_MESSAGE, t);
      }
  
      @Override
      public void info(Throwable t) {
          log(Level.INFO, EXCEPTION_MESSAGE, t);
      }
  
      @Override
      public void warn(Throwable t) {
          log(Level.WARN, EXCEPTION_MESSAGE, t);
      }
  
      @Override
      public void error(Throwable t) {
          log(Level.ERROR, EXCEPTION_MESSAGE, t);
      }
  
      @Override
      public boolean isEnabled(InternalLogLevel level) {
          return isEnabled(toLevel(level));
      }
  
      @Override
      public void log(InternalLogLevel level, String msg) {
          log(toLevel(level), msg);
     }
 
     @Override
     public void log(InternalLogLevel level, String format, Object arg) {
         log(toLevel(level), format, arg);
     }
 
     @Override
     public void log(InternalLogLevel level, String format, Object argA, Object argB) {
         log(toLevel(level), format, argA, argB);
     }
 
     @Override
     public void log(InternalLogLevel level, String format, Object... arguments) {
         log(toLevel(level), format, arguments);
     }
 
     @Override
     public void log(InternalLogLevel level, String msg, Throwable t) {
         log(toLevel(level), msg, t);
     }
 
     @Override
     public void log(InternalLogLevel level, Throwable t) {
         log(toLevel(level), EXCEPTION_MESSAGE, t);
     }
 
     private static Level toLevel(InternalLogLevel level) {
         switch (level) {
             case INFO:
                 return Level.INFO;
             case DEBUG:
                 return Level.DEBUG;
             case WARN:
                 return Level.WARN;
             case ERROR:
                 return Level.ERROR;
             case TRACE:
                 return Level.TRACE;
             default:
                 throw new Error();
         }
     }
 }