/* 
 * Copyright (c) 2004-2008 QOS.ch
 * All rights reserved.
 * 
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 * 
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 * 
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


package org.slf4j;

/**
 * The org.slf4j.Logger interface is the main user entry point of SLF4J API. 
 * It is expected that logging takes place through concrete implementations 
 * of this interface.
 *
 * <h3>Typical usage pattern:</h3>
 * <pre>
 * import org.slf4j.Logger;
 * import org.slf4j.LoggerFactory;
 * 
 * public class Wombat {
 *
 *   <span style="color:green">final static Logger logger = LoggerFactory.getLogger(Wombat.class);</span>
 *   Integer t;
 *   Integer oldT;
 *
 *   public void setTemperature(Integer temperature) {
 *     oldT = t;        
 *     t = temperature;
 *     <span style="color:green">logger.debug("Temperature set to {}. Old temperature was {}.", t, oldT);</span>
 *     if(temperature.intValue() > 50) {
 *       <span style="color:green">logger.info("Temperature has risen above 50 degrees.");</span>
 *     }
 *   }
 * }
 </pre>


 
 * @author Ceki G&uuml;lc&uuml;
 */
public interface Logger {


  /**
   * Case insensitive String constant used to retrieve the name of the root logger.
   * @since 1.3
   */
  final public String ROOT_LOGGER_NAME = "ROOT";
  
  /**
   * Return the name of this <code>Logger</code> instance.
   */
  public String getName();

  /**
   * Is the logger instance enabled for the TRACE level?
   * @return True if this Logger is enabled for the TRACE level,
   * false otherwise.
   * 
   * @since 1.4
   */
  public boolean isTraceEnabled();
    

  /**
   * Log a message at the TRACE level.
   *
   * @param msg the message string to be logged
   * @since 1.4
   */
  public void trace(String msg);

  
  /**
   * Log a message at the TRACE level according to the specified format
   * and argument.
   * 
   * <p>This form avoids superfluous object creation when the logger
   * is disabled for the TRACE level. </p>
   *
   * @param format the format string 
   * @param arg  the argument
   * 
   * @since 1.4
   */
  public void trace(String format, Object arg);


   
  /**
   * Log a message at the TRACE level according to the specified format
   * and arguments.
   * 
   * <p>This form avoids superfluous object creation when the logger
   * is disabled for the TRACE level. </p>
   *
   * @param format the format string
   * @param arg1  the first argument
   * @param arg2  the second argument
   * 
   * @since 1.4
   */
  public void trace(String format, Object arg1, Object arg2);

  /**
   * Log a message at the TRACE level according to the specified format
   * and arguments.
   * 
   * <p>This form avoids superfluous object creation when the logger
   * is disabled for the TRACE level. </p>
   *
   * @param format the format string
   * @param argArray an array of arguments
   * 
   * @since 1.4
   */
  public void trace(String format, Object[] argArray);
  
  /**
   * Log an exception (throwable) at the TRACE level with an
   * accompanying message. 
   * 
   * @param msg the message accompanying the exception
   * @param t the exception (throwable) to log
   * 
   * @since 1.4
   */ 
  public void trace(String msg, Throwable t);
 
  
  /**
   * Similar to {@link #isTraceEnabled()} method except that the
   * marker data is also taken into account.
   * 
   * @param marker The marker data to take into consideration
   * 
   * @since 1.4
   */
  public boolean isTraceEnabled(Marker marker);
  
  /**
   * Log a message with the specific Marker at the TRACE level.
   * 
   * @param marker the marker data specific to this log statement
   * @param msg the message string to be logged
   * 
   * @since 1.4
   */
  public void trace(Marker marker, String msg);
  
  /**
   * This method is similar to {@link #trace(String, Object)} method except that the 
   * marker data is also taken into consideration.
   * 
   * @param marker the marker data specific to this log statement
   * @param format the format string
   * @param arg the argument
   * 
   * @since 1.4
   */
  public void trace(Marker marker, String format, Object arg);
 
 
  /**
   * This method is similar to {@link #trace(String, Object, Object)}
   * method except that the marker data is also taken into
   * consideration.
   *
   * @param marker the marker data specific to this log statement
   * @param format  the format string
   * @param arg1  the first argument
   * @param arg2  the second argument
   * 
   * @since 1.4
   */
  public void trace(Marker marker, String format, Object arg1, Object arg2);

  /**
   * This method is similar to {@link #trace(String, Object[])}
   * method except that the marker data is also taken into
   * consideration.
   *
   * @param marker the marker data specific to this log statement
   * @param format  the format string
   * @param argArray an array of arguments
   * 
   * @since 1.4
   */
  public void trace(Marker marker, String format, Object[] argArray);

  
  /**
   * This method is similar to {@link #trace(String, Throwable)} method except that the
   * marker data is also taken into consideration.
   * 
   * @param marker the marker data specific to this log statement
   * @param msg the message accompanying the exception
   * @param t the exception (throwable) to log
   * 
   * @since 1.4
   */ 
  public void trace(Marker marker, String msg, Throwable t);

  
  /**
   * Is the logger instance enabled for the DEBUG level?
   * @return True if this Logger is enabled for the DEBUG level,
   * false otherwise.
   * 
   */
  public boolean isDebugEnabled();
  
  
  /**
   * Log a message at the DEBUG level.
   *
   * @param msg the message string to be logged
   */
  public void debug(String msg);
  
  
  /**
   * Log a message at the DEBUG level according to the specified format
   * and argument.
   * 
   * <p>This form avoids superfluous object creation when the logger
   * is disabled for the DEBUG level. </p>
   *
   * @param format the format string 
   * @param arg  the argument
   */
  public void debug(String format, Object arg);


  
  /**
   * Log a message at the DEBUG level according to the specified format
   * and arguments.
   * 
   * <p>This form avoids superfluous object creation when the logger
   * is disabled for the DEBUG level. </p>
   *
   * @param format the format string
   * @param arg1  the first argument
   * @param arg2  the second argument
   */
  public void debug(String format, Object arg1, Object arg2);

  /**
   * Log a message at the DEBUG level according to the specified format
   * and arguments.
   * 
   * <p>This form avoids superfluous object creation when the logger
   * is disabled for the DEBUG level. </p>
   *
   * @param format the format string
   * @param argArray an array of arguments
   */
  public void debug(String format, Object[] argArray);
  
  /**
   * Log an exception (throwable) at the DEBUG level with an
   * accompanying message. 
   * 
   * @param msg the message accompanying the exception
   * @param t the exception (throwable) to log
   */ 
  public void debug(String msg, Throwable t);
 
  
  /**
   * Similar to {@link #isDebugEnabled()} method except that the
   * marker data is also taken into account.
   * 
   * @param marker The marker data to take into consideration
   */
  public boolean isDebugEnabled(Marker marker);
  
  /**
   * Log a message with the specific Marker at the DEBUG level.
   * 
   * @param marker the marker data specific to this log statement
   * @param msg the message string to be logged
   */
  public void debug(Marker marker, String msg);
  
  /**
   * This method is similar to {@link #debug(String, Object)} method except that the 
   * marker data is also taken into consideration.
   * 
   * @param marker the marker data specific to this log statement
   * @param format the format string
   * @param arg the argument
   */
  public void debug(Marker marker, String format, Object arg);
 
 
  /**
   * This method is similar to {@link #debug(String, Object, Object)}
   * method except that the marker data is also taken into
   * consideration.
   *
   * @param marker the marker data specific to this log statement
   * @param format  the format string
   * @param arg1  the first argument
   * @param arg2  the second argument
   */
  public void debug(Marker marker, String format, Object arg1, Object arg2);

  /**
   * This method is similar to {@link #debug(String, Object[])}
   * method except that the marker data is also taken into
   * consideration.
   *
   * @param marker the marker data specific to this log statement
   * @param format  the format string
   * @param argArray an array of arguments
   */
  public void debug(Marker marker, String format, Object[] argArray);

  
  /**
   * This method is similar to {@link #debug(String, Throwable)} method except that the
   * marker data is also taken into consideration.
   * 
   * @param marker the marker data specific to this log statement
   * @param msg the message accompanying the exception
   * @param t the exception (throwable) to log
   */ 
  public void debug(Marker marker, String msg, Throwable t);
  
  
  /**
   * Is the logger instance enabled for the INFO level?
   * @return True if this Logger is enabled for the INFO level,
   * false otherwise.
   */
  public boolean isInfoEnabled();

  
  /**
   * Log a message at the INFO level.
   *