org.apache.poi.util

Class NullLogger

java.lang.Object

org.apache.poi.util.NullLogger

All Implemented Interfaces:

POILogger

@Internal
public class NullLogger
extends java.lang.Object
implements POILogger

A logger class that strives to make it as easy as possible for developers to write log calls, while simultaneously making those calls as cheap as possible by performing lazy evaluation of the log message.

Field Summary

Fields inherited from interface org.apache.poi.util.POILogger

DEBUG, ERROR, FATAL, INFO, WARN

Constructor Summary

Constructors

Constructor and Description
NullLogger()

Method Summary

Modifier and Type	Method and Description
void	_log(int level, java.lang.Object obj1) Log a message
void	_log(int level, java.lang.Object obj1, java.lang.Throwable exception) Log a message
boolean	check(int level) Check if a logger is enabled to log at the specified level
void	initialize(java.lang.String cat) Initialize the Logger - belongs to the SPI, called from the POILogFactory
void	log(int level, java.lang.Object... objs) Log a message.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullLogger

public NullLogger()

Method Detail

initialize

public void initialize(java.lang.String cat)

Description copied from interface: POILogger

Initialize the Logger - belongs to the SPI, called from the POILogFactory

Specified by:

initialize in interface POILogger

Parameters:

cat - the String that defines the log

_log

public void _log(int level,
                 java.lang.Object obj1)

Log a message

Specified by:

_log in interface POILogger

Parameters:

level - One of DEBUG, INFO, WARN, ERROR, FATAL

obj1 - The object to log.

_log

public void _log(int level,
                 java.lang.Object obj1,
                 java.lang.Throwable exception)

Log a message

Specified by:

_log in interface POILogger

Parameters:

level - One of DEBUG, INFO, WARN, ERROR, FATAL

obj1 - The object to log. This is converted to a string.

exception - An exception to be logged

log

public void log(int level,
                java.lang.Object... objs)

Log a message. Lazily appends Object parameters together. If the last parameter is a Throwable it is logged specially.

Specified by:

log in interface POILogger

Parameters:

level - One of DEBUG, INFO, WARN, ERROR, FATAL

objs - the objects to place in the message

check

public boolean check(int level)

Check if a logger is enabled to log at the specified level

Specified by:

check in interface POILogger

Parameters:

level - One of DEBUG, INFO, WARN, ERROR, FATAL