/*

  * #%L

  * Slf4jLog.java - mongodb-async-driver - Allanbank Consulting, Inc.

  * %%

  * Copyright (C) 2011 - 2014 Allanbank Consulting, Inc.

  * %%

  * Licensed 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.

  * #L%

  */

 package com.allanbank.mongodb.util.log;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.util.logging.Level;

 import java.util.logging.LogRecord;

 import java.util.logging.Logger;

 /**

  * Slf4jLog is the simplified logging implementation for SLF4J logging facade.

  * 

  * @api.no This class is <b>NOT</b> part of the drivers API. This class may be

  *         mutated in incompatible ways between any two releases of the driver.

  * @copyright 2014, Allanbank Consulting, Inc., All Rights Reserved

  */

 public class Slf4jLog extends AbstractLog {

     /** The delegate for the log to a SLF4J <code>LocationAwareLogger</code>. */

     private final Object myDelegate;

     /**

      * The <code>log(Marker, String, int, String, Object[])</code> method from

      * the <code>LocationAwareLogger</code> interface.

      */

     private final Method myLogMethod;

     /**

      * Creates a new {@link Slf4jLog}.

      * 

      * @param logMethod

      *            The <code>log(Marker, String, int, String, Object[])</code>

      *            method from the <code>LocationAwareLogger</code> interface.

      * @param logger

      *            The SLF4J Logger.

      */

     protected Slf4jLog(final Method logMethod, final Object logger) {

         myDelegate = logger;

         myLogMethod = logMethod;

     }

     /**

      * {@inheritDoc}

      * <p>

      * Overridden to create a {@link LogRecord} based on the log information.

      * </p>

      * 

      * @see AbstractLog#doLog(Level, Throwable, String, Object...)

      */

     @Override

     protected final void doLog(final Level level, final Throwable thrown,

             final String template, final Object... args) {

         // Note the name of the class is the AbstractLog which is where all of

         // the public log methods are implemented.

         try {

             myLogMethod.invoke(myDelegate, new Object[] { null, CLASS_NAME,

                     toInt(level), template, args, thrown });

         }

         catch (final IllegalArgumentException e) {

             Logger.getLogger(Slf4jLog.class.getName()).log(Level.WARNING,

                     "Failed to log a message: " + e.getMessage(), e);

         }

         catch (final IllegalAccessException e) {

             Logger.getLogger(Slf4jLog.class.getName()).log(Level.WARNING,

                     "Failed to log a message: " + e.getMessage(), e);

         }

         catch (final InvocationTargetException e) {

             Logger.getLogger(Slf4jLog.class.getName()).log(Level.WARNING,

                     "Failed to log a message: " + e.getMessage(), e);

         }

     }

     /**

      * Returns the integer level for the {@link Level} as defined in the

      * LocationAwareLogger interface.

      * 

      * @param level

      *            The level to convert.

      * @return The integer level.

      */

     private Integer toInt(final Level level) {

         final int levelIntValue = (level != null) ? level.intValue() : 0;

         // Note: Return values are from the <code>LocationAwareLogger</code>

         // interface.

         if (levelIntValue == 0) {

             return 0;

         }

         else if (levelIntValue <= Level.FINE.intValue()) {

             return 10;

         }

         else if (levelIntValue <= Level.INFO.intValue()) {

             return 20;

         }

         else if (levelIntValue <= Level.WARNING.intValue()) {

             return 30;

         }

         else {

             return 40;

         }

     }

 }