org.slf4j.helpers

Class NOPLogger

java.lang.Object

org.slf4j.helpers.MarkerIgnoringBase

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

Fields

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

Fields inherited from interface org.slf4j.Logger

ROOT_LOGGER_NAME

Constructor Summary

Constructors

Modifier	Constructor and Description
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

Modifier and Type	Method and Description
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, 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

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... argArray)

A NOP implementation.

Parameters:

format - the format string

argArray - a list of 3 or more arguments

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 msg,
                        Throwable t)

A NOP implementation.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

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... argArray)

A NOP implementation.

Parameters:

format - the format string

argArray - a list of 3 or more arguments

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 msg,
                        Throwable t)

A NOP implementation.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

getName

public String getName()

Always returns the string value "NOP".

Specified by:

getName in interface Logger

Returns:

name of this logger instance

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... argArray)

A NOP implementation.

Parameters:

format - the format string

argArray - a list of 3 or more arguments

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 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

isErrorEnabled

public final boolean isErrorEnabled()

A NOP implementation.

Returns:

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

isInfoEnabled

public final boolean isInfoEnabled()

Always returns false.

Returns:

always false

isTraceEnabled

public final boolean isTraceEnabled()

Always returns false.

Returns:

always false

isWarnEnabled

public final boolean isWarnEnabled()

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... argArray)

A NOP implementation.

Parameters:

format - the format string

argArray - a list of 3 or more arguments

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 msg,
                        Throwable t)

A NOP implementation.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

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... argArray)

A NOP implementation.

Parameters:

format - the format string

argArray - a list of 3 or more arguments

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 msg,
                       Throwable t)

A NOP implementation.

Parameters:

msg - the message accompanying the exception

t - the exception (throwable) to log

readResolve

protected Object readResolve()
                      throws java.io.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:

java.io.ObjectStreamException