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

    Methods
    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, 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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