/*
    * 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.logging.slf4j;
  
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.io.Serializable;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.message.Message;
  import org.apache.logging.log4j.message.ParameterizedMessage;
  import org.apache.logging.log4j.message.SimpleMessage;
  import org.apache.logging.log4j.spi.ExtendedLogger;
  import org.slf4j.Marker;
  import org.slf4j.MarkerFactory;
  import org.slf4j.impl.StaticMarkerBinder;
  import org.slf4j.spi.LocationAwareLogger;
  
  /**
   * SLF4J logger implementation that uses Log4j.
   */
  public class Log4jLogger implements LocationAwareLogger, Serializable {
  
      public static final String FQCN = Log4jLogger.class.getName();
  
      private static final long serialVersionUID = 7869000638091304316L;
      private static final Marker EVENT_MARKER = MarkerFactory.getMarker("EVENT");
      private final boolean eventLogger;
      private transient ExtendedLogger logger;
      private final String name;
      private transient EventDataConverter converter;
  
      public Log4jLogger(final ExtendedLogger logger, final String name) {
          this.logger = logger;
          this.eventLogger = "EventLogger".equals(name);
          this.name = name;
          this.converter = createConverter();
      }
  
      @Override
      public void trace(final String format) {
          logger.logIfEnabled(FQCN, Level.TRACE, null, format);
      }
  
      @Override
      public void trace(final String format, final Object o) {
          logger.logIfEnabled(FQCN, Level.TRACE, null, format, o);
      }
  
      @Override
      public void trace(final String format, final Object arg1, final Object arg2) {
          logger.logIfEnabled(FQCN, Level.TRACE, null, format, arg1, arg2);
      }
  
      @Override
      public void trace(final String format, final Object... args) {
          logger.logIfEnabled(FQCN, Level.TRACE, null, format, args);
      }
  
      @Override
      public void trace(final String format, final Throwable t) {
          logger.logIfEnabled(FQCN, Level.TRACE, null, format, t);
      }
  
      @Override
      public boolean isTraceEnabled() {
          return logger.isEnabled(Level.TRACE, null, null);
      }
  
      @Override
      public boolean isTraceEnabled(final Marker marker) {
          return logger.isEnabled(Level.TRACE, getMarker(marker), null);
      }
  
      @Override
      public void trace(final Marker marker, final String s) {
          logger.logIfEnabled(FQCN, Level.TRACE, getMarker(marker), s);
      }
  
      @Override
      public void trace(final Marker marker, final String s, final Object o) {
          logger.logIfEnabled(FQCN, Level.TRACE, getMarker(marker), s, o);
      }
 
     @Override
     public void trace(final Marker marker, final String s, final Object o, final Object o1) {
         logger.logIfEnabled(FQCN, Level.TRACE, getMarker(marker), s, o, o1);
     }
 
     @Override
     public void trace(final Marker marker, final String s, final Object... objects) {
         logger.logIfEnabled(FQCN, Level.TRACE, getMarker(marker), s, objects);
     }
 
     @Override
     public void trace(final Marker marker, final String s, final Throwable throwable) {
         logger.logIfEnabled(FQCN, Level.TRACE, getMarker(marker), s, throwable);
     }
 
     @Override
     public void debug(final String format) {
         logger.logIfEnabled(FQCN, Level.DEBUG, null, format);
     }
 
     @Override
     public void debug(final String format, final Object o) {
         logger.logIfEnabled(FQCN, Level.DEBUG, null, format, o);
     }
 
     @Override
     public void debug(final String format, final Object arg1, final Object arg2) {
         logger.logIfEnabled(FQCN, Level.DEBUG, null, format, arg1, arg2);
     }
 
     @Override
     public void debug(final String format, final Object... args) {
         logger.logIfEnabled(FQCN, Level.DEBUG, null, format, args);
     }
 
     @Override
     public void debug(final String format, final Throwable t) {
         logger.logIfEnabled(FQCN, Level.DEBUG, null, format, t);
     }
 
     @Override
     public boolean isDebugEnabled() {
         return logger.isEnabled(Level.DEBUG, null, null);
     }
 
     @Override
     public boolean isDebugEnabled(final Marker marker) {
         return logger.isEnabled(Level.DEBUG, getMarker(marker), null);
     }
 
     @Override
     public void debug(final Marker marker, final String s) {
         logger.logIfEnabled(FQCN, Level.DEBUG, getMarker(marker), s);
     }
 
     @Override
     public void debug(final Marker marker, final String s, final Object o) {
         logger.logIfEnabled(FQCN, Level.DEBUG, getMarker(marker), s, o);
     }
 
     @Override
     public void debug(final Marker marker, final String s, final Object o, final Object o1) {
         logger.logIfEnabled(FQCN, Level.DEBUG, getMarker(marker), s, o, o1);
     }
 
     @Override
     public void debug(final Marker marker, final String s, final Object... objects) {
         logger.logIfEnabled(FQCN, Level.DEBUG, getMarker(marker), s, objects);
     }
 
     @Override
     public void debug(final Marker marker, final String s, final Throwable throwable) {
         logger.logIfEnabled(FQCN, Level.DEBUG, getMarker(marker), s, throwable);
     }
 
     @Override
     public void info(final String format) {
         logger.logIfEnabled(FQCN, Level.INFO, null, format);
     }
 
     @Override
     public void info(final String format, final Object o) {
         logger.logIfEnabled(FQCN, Level.INFO, null, format, o);
     }
 
     @Override
     public void info(final String format, final Object arg1, final Object arg2) {
         logger.logIfEnabled(FQCN, Level.INFO, null, format, arg1, arg2);
     }
 
     @Override
     public void info(final String format, final Object... args) {
         logger.logIfEnabled(FQCN, Level.INFO, null, format, args);
     }
 
     @Override
     public void info(final String format, final Throwable t) {
         logger.logIfEnabled(FQCN, Level.INFO, null, format, t);
     }
 
     @Override
     public boolean isInfoEnabled() {
         return logger.isEnabled(Level.INFO, null, null);
     }
 
     @Override
     public boolean isInfoEnabled(final Marker marker) {
         return logger.isEnabled(Level.INFO, getMarker(marker), null);
     }
 
     @Override
     public void info(final Marker marker, final String s) {
         logger.logIfEnabled(FQCN, Level.INFO, getMarker(marker), s);
     }
 
     @Override
     public void info(final Marker marker, final String s, final Object o) {
         logger.logIfEnabled(FQCN, Level.INFO, getMarker(marker), s, o);
     }
 
     @Override
     public void info(final Marker marker, final String s, final Object o, final Object o1) {
         logger.logIfEnabled(FQCN, Level.INFO, getMarker(marker), s, o, o1);
     }
 
     @Override
     public void info(final Marker marker, final String s, final Object... objects) {
         logger.logIfEnabled(FQCN, Level.INFO, getMarker(marker), s, objects);
     }
 
     @Override
     public void info(final Marker marker, final String s, final Throwable throwable) {
         logger.logIfEnabled(FQCN, Level.INFO, getMarker(marker), s, throwable);
     }
 
     @Override
     public void warn(final String format) {
         logger.logIfEnabled(FQCN, Level.WARN, null, format);
     }
 
     @Override
     public void warn(final String format, final Object o) {
         logger.logIfEnabled(FQCN, Level.WARN, null, format, o);
     }
 
     @Override
     public void warn(final String format, final Object arg1, final Object arg2) {
         logger.logIfEnabled(FQCN, Level.WARN, null, format, arg1, arg2);
     }
 
     @Override
     public void warn(final String format, final Object... args) {
         logger.logIfEnabled(FQCN, Level.WARN, null, format, args);
     }
 
     @Override
     public void warn(final String format, final Throwable t) {
         logger.logIfEnabled(FQCN, Level.WARN, null, format, t);
     }
 
     @Override
     public boolean isWarnEnabled() {
         return logger.isEnabled(Level.WARN, null, null);
     }
 
     @Override
     public boolean isWarnEnabled(final Marker marker) {
         return logger.isEnabled(Level.WARN, getMarker(marker), null);
     }
 
     @Override
     public void warn(final Marker marker, final String s) {
         logger.logIfEnabled(FQCN, Level.WARN, getMarker(marker), s);
     }
 
     @Override
     public void warn(final Marker marker, final String s, final Object o) {
         logger.logIfEnabled(FQCN, Level.WARN, getMarker(marker), s, o);
     }
 
     @Override
     public void warn(final Marker marker, final String s, final Object o, final Object o1) {
         logger.logIfEnabled(FQCN, Level.WARN, getMarker(marker), s, o, o1);
     }
 
     @Override
     public void warn(final Marker marker, final String s, final Object... objects) {
         logger.logIfEnabled(FQCN, Level.WARN, getMarker(marker), s, objects);
     }
 
     @Override
     public void warn(final Marker marker, final String s, final Throwable throwable) {
         logger.logIfEnabled(FQCN, Level.WARN, getMarker(marker), s, throwable);
     }
 
     @Override
     public void error(final String format) {
         logger.logIfEnabled(FQCN, Level.ERROR, null, format);
     }
 
     @Override
     public void error(final String format, final Object o) {
         logger.logIfEnabled(FQCN, Level.ERROR, null, format, o);
     }
 
     @Override
     public void error(final String format, final Object arg1, final Object arg2) {
         logger.logIfEnabled(FQCN, Level.ERROR, null, format, arg1, arg2);
     }
 
     @Override
     public void error(final String format, final Object... args) {
         logger.logIfEnabled(FQCN, Level.ERROR, null, format, args);
     }
 
     @Override
     public void error(final String format, final Throwable t) {
         logger.logIfEnabled(FQCN, Level.ERROR, null, format, t);
     }
 
     @Override
     public boolean isErrorEnabled() {
         return logger.isEnabled(Level.ERROR, null, null);
     }
 
     @Override
     public boolean isErrorEnabled(final Marker marker) {
         return logger.isEnabled(Level.ERROR, getMarker(marker), null);
     }
 
     @Override
     public void error(final Marker marker, final String s) {
         logger.logIfEnabled(FQCN, Level.ERROR, getMarker(marker), s);
     }
 
     @Override
     public void error(final Marker marker, final String s, final Object o) {
         logger.logIfEnabled(FQCN, Level.ERROR, getMarker(marker), s, o);
     }
 
     @Override
     public void error(final Marker marker, final String s, final Object o, final Object o1) {
         logger.logIfEnabled(FQCN, Level.ERROR, getMarker(marker), s, o, o1);
     }
 
     @Override
     public void error(final Marker marker, final String s, final Object... objects) {
         logger.logIfEnabled(FQCN, Level.ERROR, getMarker(marker), s, objects);
     }
 
     @Override
     public void error(final Marker marker, final String s, final Throwable throwable) {
         logger.logIfEnabled(FQCN, Level.ERROR, getMarker(marker), s, throwable);
     }
 
     @Override
     public void log(final Marker marker, final String fqcn, final int level, final String message, final Object[] params, Throwable throwable) {
         final Level log4jLevel = getLevel(level);
         final org.apache.logging.log4j.Marker log4jMarker = getMarker(marker);
 
         if (!logger.isEnabled(log4jLevel, log4jMarker, message, params)) {
             return;
         }
         final Message msg;
         if (eventLogger && marker != null && marker.contains(EVENT_MARKER) && converter != null) {
             msg = converter.convertEvent(message, params, throwable);
         } else if (params == null) {
             msg = new SimpleMessage(message);
         } else {
             msg = new ParameterizedMessage(message, params, throwable);
             if (throwable != null) {
                 throwable = msg.getThrowable();
             }
         }
         logger.logMessage(fqcn, log4jLevel, log4jMarker, msg, throwable);
     }
 
     private static org.apache.logging.log4j.Marker getMarker(final Marker marker) {
         if (marker == null) {
             return null;
         } else if (marker instanceof Log4jMarker) {
             return ((Log4jMarker) marker).getLog4jMarker();
         } else {
             final Log4jMarkerFactory factory = (Log4jMarkerFactory) StaticMarkerBinder.SINGLETON.getMarkerFactory();
             return ((Log4jMarker) factory.getMarker(marker)).getLog4jMarker();
         }
     }
 
     @Override
     public String getName() {
         return name;
     }
 
     /**
      * Always treat de-serialization as a full-blown constructor, by validating the final state of
      * the de-serialized object.
      */
     private void readObject(final ObjectInputStream aInputStream) throws ClassNotFoundException, IOException {
         // always perform the default de-serialization first
         aInputStream.defaultReadObject();
         logger = LogManager.getContext().getLogger(name);
         converter = createConverter();
     }
 
     /**
      * This is the default implementation of writeObject. Customise if necessary.
      */
     private void writeObject(final ObjectOutputStream aOutputStream) throws IOException {
         // perform the default serialization for all non-transient, non-static fields
         aOutputStream.defaultWriteObject();
     }
 
     private static EventDataConverter createConverter() {
         try {
             Class.forName("org.slf4j.ext.EventData");
             return new EventDataConverter();
         } catch (final ClassNotFoundException cnfe) {
             return null;
         }
     }
 
     private static Level getLevel(final int i) {
         switch (i) {
         case TRACE_INT:
             return Level.TRACE;
         case DEBUG_INT:
             return Level.DEBUG;
         case INFO_INT:
             return Level.INFO;
         case WARN_INT:
             return Level.WARN;
         case ERROR_INT:
             return Level.ERROR;
         }
         return Level.ERROR;
     }
 }