org.slf4j.helpers
Class NOPLogger

java.lang.Object
  extended by org.slf4j.helpers.MarkerIgnoringBase
      extended by org.slf4j.helpers.NOPLogger
All Implemented Interfaces:
Serializable, Logger

public class NOPLogger
extends MarkerIgnoringBase

A direct NOP (no operation) implementation of Logger.

Author:
Ceki Gülcü
See Also:
Serialized Form

Field Summary
protected  String name
           
static NOPLogger NOP_LOGGER
          The unique instance of NOPLogger.
 
Fields inherited from interface org.slf4j.Logger
ROOT_LOGGER_NAME
 
Constructor Summary
protected NOPLogger()
          There is no point in creating multiple instances of NOPLOgger, except by derived classes, hence the protected access for the constructor.
 
Method Summary
 void debug(String msg)
          A NOP implementation.
 void debug(String format, Object... argArray)
          A NOP implementation.
 void debug(String format, Object arg)
          A NOP implementation.
 void debug(String format, Object arg1, Object arg2)
          A NOP implementation.
 void debug(String msg, Throwable t)
          A NOP implementation.
 void error(String msg)
          A NOP implementation.
 void error(String format, Object... argArray)
          A NOP implementation.
 void error(String format, Object arg1)
          A NOP implementation.
 void error(String format, Object arg1, Object arg2)
          A NOP implementation.
 void error(String msg, Throwable t)
          A NOP implementation.
 String getName()
          Always returns the string value "NOP".
 void info(String msg)
          A NOP implementation.
 void info(String format, Object... argArray)
          A NOP implementation.
 void info(String format, Object arg1)
          A NOP implementation.
 void info(String format, Object arg1, Object arg2)
          A NOP implementation.
 void info(String msg, Throwable t)
          A NOP implementation.
 boolean isDebugEnabled()
          Always returns false.
 boolean isErrorEnabled()
          A NOP implementation.
 boolean isInfoEnabled()
          Always returns false.
 boolean isTraceEnabled()
          Always returns false.
 boolean isWarnEnabled()
          Always returns false.
protected  Object readResolve()
          Replace this instance with a homonymous (same name) logger returned by LoggerFactory.
 void trace(String msg)
          A NOP implementation.
 void trace(String format, Object... argArray)
          A NOP implementation.
 void trace(String format, Object arg)
          A NOP implementation.
 void trace(String format, Object arg1, Object arg2)
          A NOP implementation.
 void trace(String msg, Throwable t)
          A NOP implementation.
 void warn(String msg)
          A NOP implementation.
 void warn(String format, Object... argArray)
          A NOP implementation.
 void warn(String format, Object arg1)
          A NOP implementation.
 void warn(String format, Object arg1, Object arg2)
          A NOP implementation.
 void warn(String msg, Throwable t)
          A NOP implementation.
 
Methods inherited from class org.slf4j.helpers.MarkerIgnoringBase
debug, debug, debug, debug, debug, error, error, error, error, error, info, info, info, info, info, isDebugEnabled, isErrorEnabled, isInfoEnabled, isTraceEnabled, isWarnEnabled, toString, trace, trace, trace, trace, trace, warn, warn, warn, warn, warn
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

NOP_LOGGER

public static final NOPLogger NOP_LOGGER
The unique instance of NOPLogger.


name

protected String name
Constructor Detail

NOPLogger

protected NOPLogger()
There is no point in creating multiple instances of NOPLOgger, except by derived classes, hence the protected access for the constructor.

Method Detail

getName

public String getName()
Always returns the string value "NOP".

Specified by:
getName in interface Logger
Returns:
name of this logger instance

isTraceEnabled

public final boolean isTraceEnabled()
Always returns false.

Returns:
always false

trace

public final void trace(String msg)
A NOP implementation.

Parameters:
msg - the message string to be logged

trace

public final void trace(String format,
                        Object arg)
A NOP implementation.

Parameters:
format - the format string
arg - the argument

trace

public final void trace(String format,
                        Object arg1,
                        Object arg2)
A NOP implementation.

Parameters:
format - the format string
arg1 - the first argument
arg2 - the second argument

trace

public final void trace(String format,
                        Object... argArray)
A NOP implementation.

Parameters:
format - the format string
argArray - a list of 3 or more arguments

trace

public final void trace(String msg,
                        Throwable t)
A NOP implementation.

Parameters:
msg - the message accompanying the exception
t - the exception (throwable) to log

isDebugEnabled

public final boolean isDebugEnabled()
Always returns false.

Returns:
always false

debug

public final void debug(String msg)
A NOP implementation.

Parameters:
msg - the message string to be logged

debug

public final void debug(String format,
                        Object arg)
A NOP implementation.

Parameters:
format - the format string
arg - the argument

debug

public final void debug(String format,
                        Object arg1,
                        Object arg2)
A NOP implementation.

Parameters:
format - the format string
arg1 - the first argument
arg2 - the second argument

debug

public final void debug(String format,
                        Object... argArray)
A NOP implementation.

Parameters:
format - the format string
argArray - a list of 3 or more arguments

debug

public final void debug(String msg,
                        Throwable t)
A NOP implementation.

Parameters:
msg - the message accompanying the exception
t - the exception (throwable) to log

isInfoEnabled

public final boolean isInfoEnabled()
Always returns false.

Returns:
always false

info

public final void info(String msg)
A NOP implementation.

Parameters:
msg - the message string to be logged

info

public final void info(String format,
                       Object arg1)
A NOP implementation.

Parameters:
format - the format string
arg1 - the argument

info

public final void info(String format,
                       Object arg1,
                       Object arg2)
A NOP implementation.

Parameters:
format - the format string
arg1 - the first argument
arg2 - the second argument

info

public final void info(String format,
                       Object... argArray)
A NOP implementation.

Parameters:
format - the format string
argArray - a list of 3 or more arguments

info

public final void info(String msg,
                       Throwable t)
A NOP implementation.

Parameters:
msg - the message accompanying the exception
t - the exception (throwable) to log

isWarnEnabled

public final boolean isWarnEnabled()
Always returns false.

Returns:
always false

warn

public final void warn(String msg)
A NOP implementation.

Parameters:
msg - the message string to be logged

warn

public final void warn(String format,
                       Object arg1)
A NOP implementation.

Parameters:
format - the format string
arg1 - the argument

warn

public final void warn(String format,
                       Object arg1,
                       Object arg2)
A NOP implementation.

Parameters:
format - the format string
arg1 - the first argument
arg2 - the second argument

warn

public final void warn(String format,
                       Object... argArray)
A NOP implementation.

Parameters:
format - the format string
argArray - a list of 3 or more arguments

warn

public final void warn(String msg,
                       Throwable t)
A NOP implementation.

Parameters:
msg - the message accompanying the exception
t - the exception (throwable) to log

isErrorEnabled

public final boolean isErrorEnabled()
A NOP implementation.

Returns:
True if this Logger is enabled for the ERROR level, false otherwise.

error

public final void error(String msg)
A NOP implementation.

Parameters:
msg - the message string to be logged

error

public final void error(String format,
                        Object arg1)
A NOP implementation.

Parameters:
format - the format string
arg1 - the argument

error

public final void error(String format,
                        Object arg1,
                        Object arg2)
A NOP implementation.

Parameters:
format - the format string
arg1 - the first argument
arg2 - the second argument

error

public final void error(String format,
                        Object... argArray)
A NOP implementation.

Parameters:
format - the format string
argArray - a list of 3 or more arguments

error

public final void error(String msg,
                        Throwable t)
A NOP implementation.

Parameters:
msg - the message accompanying the exception
t - the exception (throwable) to log

readResolve

protected Object readResolve()
                      throws ObjectStreamException
Replace this instance with a homonymous (same name) logger returned by LoggerFactory. Note that this method is only called during deserialization.

This approach will work well if the desired ILoggerFactory is the one references by LoggerFactory. However, if the user manages its logger hierarchy through a different (non-static) mechanism, e.g. dependency injection, then this approach would be mostly counterproductive.

Returns:
logger with same name as returned by LoggerFactory
Throws:
ObjectStreamException


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