Package org.slf4j.helpers

Class NOPLogger

java.lang.Object

org.slf4j.helpers.NOPLogger

All Implemented Interfaces:

Serializable, Logger

public class NOPLogger
extends Object
implements Logger

A direct NOP (no operation) implementation of Logger.

Author:

Ceki Gülcü

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected String	name
static final NOPLogger	NOP_LOGGER	The unique instance of NOPLogger.

Fields inherited from interface org.slf4j.Logger

ROOT_LOGGER_NAME

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	NOPLogger()	There is no point in creating multiple instances of NOPLogger.

Method Summary

Modifier and Type	Method	Description
final void	debug(String msg)	A NOP implementation.
final void	debug(String format, Object arg)	A NOP implementation.
final void	debug(String format, Object... argArray)	A NOP implementation.
final void	debug(String format, Object arg1, Object arg2)	A NOP implementation.
final void	debug(String msg, Throwable t)	A NOP implementation.
final void	debug(Marker marker, String msg)	A NOP implementation.
final void	debug(Marker marker, String format, Object arg)	A NOP implementation.
final void	debug(Marker marker, String format, Object... arguments)	This method is similar to Logger.debug(String, Object...) method except that the marker data is also taken into consideration.
final void	debug(Marker marker, String format, Object arg1, Object arg2)	A NOP implementation.
final void	debug(Marker marker, String msg, Throwable t)	This method is similar to Logger.debug(String, Throwable) method except that the marker data is also taken into consideration.
final void	error(String msg)	A NOP implementation.
final void	error(String format, Object arg1)	A NOP implementation.
final void	error(String format, Object... argArray)	A NOP implementation.
final void	error(String format, Object arg1, Object arg2)	A NOP implementation.
final void	error(String msg, Throwable t)	A NOP implementation.
final void	error(Marker marker, String msg)	A NOP implementation.
final void	error(Marker marker, String format, Object arg)	A NOP implementation.
final void	error(Marker marker, String format, Object... arguments)	A NOP implementation.
final void	error(Marker marker, String format, Object arg1, Object arg2)	A NOP implementation.
final void	error(Marker marker, String msg, Throwable t)	A NOP implementation.
String	getName()	Always returns the string value "NOP".
final void	info(String msg)	A NOP implementation.
final void	info(String format, Object arg1)	A NOP implementation.
final void	info(String format, Object... argArray)	A NOP implementation.
final void	info(String format, Object arg1, Object arg2)	A NOP implementation.
final void	info(String msg, Throwable t)	A NOP implementation.
final void	info(Marker marker, String msg)	A NOP implementation.
final void	info(Marker marker, String format, Object arg)	A NOP implementation.
final void	info(Marker marker, String format, Object... arguments)	A NOP implementation.
final void	info(Marker marker, String format, Object arg1, Object arg2)	A NOP implementation.
final void	info(Marker marker, String msg, Throwable t)	A NOP implementation.
final boolean	isDebugEnabled()	Always returns false.
final boolean	isDebugEnabled(Marker marker)	Always returns false.
final boolean	isErrorEnabled()	A NOP implementation.
final boolean	isErrorEnabled(Marker marker)	Always returns false.
final boolean	isInfoEnabled()	Always returns false.
boolean	isInfoEnabled(Marker marker)	Always returns false.
final boolean	isTraceEnabled()	Always returns false.
final boolean	isTraceEnabled(Marker marker)	Always returns false.
final boolean	isWarnEnabled()	Always returns false.
final boolean	isWarnEnabled(Marker marker)	Always returns false.
protected Object	readResolve()	Replace this instance with a homonymous (same name) logger returned by LoggerFactory.
final void	trace(String msg)	A NOP implementation.
final void	trace(String format, Object arg)	A NOP implementation.
final void	trace(String format, Object... argArray)	A NOP implementation.
final void	trace(String format, Object arg1, Object arg2)	A NOP implementation.
final void	trace(String msg, Throwable t)	A NOP implementation.
final void	trace(Marker marker, String msg)	A NOP implementation.
final void	trace(Marker marker, String format, Object arg)	A NOP implementation.
final void	trace(Marker marker, String format, Object... argArray)	A NOP implementation.
final void	trace(Marker marker, String format, Object arg1, Object arg2)	A NOP implementation.
final void	trace(Marker marker, String msg, Throwable t)	A NOP implementation.
final void	warn(String msg)	A NOP implementation.
final void	warn(String format, Object arg1)	A NOP implementation.
final void	warn(String format, Object... argArray)	A NOP implementation.
final void	warn(String format, Object arg1, Object arg2)	A NOP implementation.
final void	warn(String msg, Throwable t)	A NOP implementation.
final void	warn(Marker marker, String msg)	A NOP implementation.
final void	warn(Marker marker, String format, Object arg)	A NOP implementation.
final void	warn(Marker marker, String format, Object... arguments)	A NOP implementation.
final void	warn(Marker marker, String format, Object arg1, Object arg2)	A NOP implementation.
final void	warn(Marker marker, String msg, Throwable t)	A NOP implementation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.slf4j.Logger

atDebug, atError, atInfo, atLevel, atTrace, atWarn, isEnabledForLevel, makeLoggingEventBuilder

Field Details

NOP_LOGGER

public static final NOPLogger NOP_LOGGER

The unique instance of NOPLogger.

name

protected String name

Constructor Details

NOPLogger

protected NOPLogger()

There is no point in creating multiple instances of NOPLogger. The present constructor should be "private" but we are leaving it as "protected" for compatibility.

Method Details

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.

Specified by:

isTraceEnabled in interface Logger

Returns:

always false

trace

public final void trace(String msg)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

msg - the message string to be logged

trace

public final void trace(String format,
 Object arg)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

format - the format string

arg - the argument

trace

public final void trace(String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

trace in interface Logger

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.

Specified by:

trace in interface Logger

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.

Specified by:

trace in interface Logger

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isDebugEnabled

public final boolean isDebugEnabled()

Always returns false.

Specified by:

isDebugEnabled in interface Logger

Returns:

always false

debug

public final void debug(String msg)

A NOP implementation.

Specified by:

debug in interface Logger

Parameters:

msg - the message string to be logged

debug

public final void debug(String format,
 Object arg)

A NOP implementation.

Specified by:

debug in interface Logger

Parameters:

format - the format string

arg - the argument

debug

public final void debug(String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

debug in interface Logger

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.

Specified by:

debug in interface Logger

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.

Specified by:

debug in interface Logger

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isInfoEnabled

public final boolean isInfoEnabled()

Always returns false.

Specified by:

isInfoEnabled in interface Logger

Returns:

always false

info

public final void info(String msg)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

msg - the message string to be logged

info

public final void info(String format,
 Object arg1)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

format - the format string

arg1 - the argument

info

public final void info(String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

info in interface Logger

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.

Specified by:

info in interface Logger

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.

Specified by:

info in interface Logger

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isWarnEnabled

public final boolean isWarnEnabled()

Always returns false.

Specified by:

isWarnEnabled in interface Logger

Returns:

always false

warn

public final void warn(String msg)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

msg - the message string to be logged

warn

public final void warn(String format,
 Object arg1)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

format - the format string

arg1 - the argument

warn

public final void warn(String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

warn in interface Logger

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.

Specified by:

warn in interface Logger

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.

Specified by:

warn in interface Logger

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isErrorEnabled

public final boolean isErrorEnabled()

A NOP implementation.

Specified by:

isErrorEnabled in interface Logger

Returns:

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

error

public final void error(String msg)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

msg - the message string to be logged

error

public final void error(String format,
 Object arg1)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

format - the format string

arg1 - the argument

error

public final void error(String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

error in interface Logger

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.

Specified by:

error in interface Logger

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.

Specified by:

error in interface Logger

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

isTraceEnabled

public final boolean isTraceEnabled(Marker marker)

Always returns false.

Specified by:

isTraceEnabled in interface Logger

Parameters:

marker - The marker data to take into consideration

Returns:

always false

trace

public final void trace(Marker marker,
 String msg)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

marker - the marker data specific to this log statement

msg - the message string to be logged

trace

public final void trace(Marker marker,
 String format,
 Object arg)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg - the argument

trace

public final void trace(Marker marker,
 String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg1 - the first argument

arg2 - the second argument

trace

public final void trace(Marker marker,
 String format,
 Object... argArray)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

argArray - an array of arguments

trace

public final void trace(Marker marker,
 String msg,
 Throwable t)

A NOP implementation.

Specified by:

trace in interface Logger

Parameters:

marker - the marker data specific to this log statement

msg - the message accompanying the exception

t - the exception (throwable) to log

isDebugEnabled

public final boolean isDebugEnabled(Marker marker)

Always returns false.

Specified by:

isDebugEnabled in interface Logger

Parameters:

marker - The marker data to take into consideration

Returns:

always false

debug

public final void debug(Marker marker,
 String msg)

A NOP implementation.

Specified by:

debug in interface Logger

Parameters:

marker - the marker data specific to this log statement

msg - the message string to be logged

debug

public final void debug(Marker marker,
 String format,
 Object arg)

A NOP implementation.

Specified by:

debug in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg - the argument

debug

public final void debug(Marker marker,
 String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

debug in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg1 - the first argument

arg2 - the second argument

debug

public final void debug(Marker marker,
 String format,
 Object... arguments)

Description copied from interface: Logger

This method is similar to Logger.debug(String, Object...) method except that the marker data is also taken into consideration.

Specified by:

debug in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arguments - a list of 3 or more arguments

debug

public final void debug(Marker marker,
 String msg,
 Throwable t)

Description copied from interface: Logger

This method is similar to Logger.debug(String, Throwable) method except that the marker data is also taken into consideration.

Specified by:

debug in interface Logger

Parameters:

marker - the marker data specific to this log statement

msg - the message accompanying the exception

t - the exception (throwable) to log

isInfoEnabled

public boolean isInfoEnabled(Marker marker)

Always returns false.

Specified by:

isInfoEnabled in interface Logger

Parameters:

marker - The marker data to take into consideration

Returns:

always false

info

public final void info(Marker marker,
 String msg)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

marker - The marker specific to this log statement

msg - the message string to be logged

info

public final void info(Marker marker,
 String format,
 Object arg)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg - the argument

info

public final void info(Marker marker,
 String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg1 - the first argument

arg2 - the second argument

info

public final void info(Marker marker,
 String format,
 Object... arguments)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arguments - a list of 3 or more arguments

info

public final void info(Marker marker,
 String msg,
 Throwable t)

A NOP implementation.

Specified by:

info in interface Logger

Parameters:

marker - the marker data for this log statement

msg - the message accompanying the exception

t - the exception (throwable) to log

isWarnEnabled

public final boolean isWarnEnabled(Marker marker)

Always returns false.

Specified by:

isWarnEnabled in interface Logger

Parameters:

marker - The marker data to take into consideration

Returns:

always false

warn

public final void warn(Marker marker,
 String msg)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

marker - The marker specific to this log statement

msg - the message string to be logged

warn

public final void warn(Marker marker,
 String format,
 Object arg)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg - the argument

warn

public final void warn(Marker marker,
 String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg1 - the first argument

arg2 - the second argument

warn

public final void warn(Marker marker,
 String format,
 Object... arguments)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arguments - a list of 3 or more arguments

warn

public final void warn(Marker marker,
 String msg,
 Throwable t)

A NOP implementation.

Specified by:

warn in interface Logger

Parameters:

marker - the marker data for this log statement

msg - the message accompanying the exception

t - the exception (throwable) to log

isErrorEnabled

public final boolean isErrorEnabled(Marker marker)

Always returns false.

Specified by:

isErrorEnabled in interface Logger

Parameters:

marker - The marker data to take into consideration

Returns:

always false

error

public final void error(Marker marker,
 String msg)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

marker - The marker specific to this log statement

msg - the message string to be logged

error

public final void error(Marker marker,
 String format,
 Object arg)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg - the argument

error

public final void error(Marker marker,
 String format,
 Object arg1,
 Object arg2)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arg1 - the first argument

arg2 - the second argument

error

public final void error(Marker marker,
 String format,
 Object... arguments)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

marker - the marker data specific to this log statement

format - the format string

arguments - a list of 3 or more arguments

error

public final void error(Marker marker,
 String msg,
 Throwable t)

A NOP implementation.

Specified by:

error in interface Logger

Parameters:

marker - the marker data specific to this log statement

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 referenced 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