Package 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:

  • 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, except by derived classes, hence the protected access for the constructor.

  • 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.
      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