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org.apache.poi.util
Class NullLogger

java.lang.Object
  extended by org.apache.poi.util.POILogger
      extended by org.apache.poi.util.NullLogger

public class NullLogger
extends 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.

Author:
Marc Johnson (mjohnson at apache dot org), Glen Stampoultzis (glens at apache.org), Nicola Ken Barozzi (nicolaken at apache.org)

Field Summary
 
Fields inherited from class org.apache.poi.util.POILogger
DEBUG, ERROR, FATAL, INFO, WARN
 
Constructor Summary
NullLogger()
           
 
Method Summary
 boolean check(int level)
          Check if a logger is enabled to log at the specified level
 void initialize(java.lang.String cat)
           
 void log(int level, java.lang.Object obj1)
          Log a message
 void log(int level, java.lang.Object obj1, java.lang.Object obj2)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Object obj6)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Object obj6, java.lang.Object obj7)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Object obj6, java.lang.Object obj7, java.lang.Object obj8)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Object obj6, java.lang.Object obj7, java.lang.Object obj8, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Object obj6, java.lang.Object obj7, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Object obj6, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Object obj5, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Object obj2, java.lang.Throwable exception)
          Log a message.
 void log(int level, java.lang.Object obj1, java.lang.Throwable exception)
          Log a message
 void logFormatted(int level, java.lang.String message, java.lang.Object obj1)
          Logs a formated message.
 void logFormatted(int level, java.lang.String message, java.lang.Object obj1, java.lang.Object obj2)
          Logs a formated message.
 void logFormatted(int level, java.lang.String message, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3)
          Logs a formated message.
 void logFormatted(int level, java.lang.String message, java.lang.Object obj1, java.lang.Object obj2, java.lang.Object obj3, java.lang.Object obj4)
          Logs a formated message.
 
Methods inherited from class org.apache.poi.util.POILogger
log
 
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)
Specified by:
initialize in class POILogger

log

public void log(int level,
                java.lang.Object obj1)
Log a message

Specified by:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - The object to log.

check

public boolean check(int level)
Check if a logger is enabled to log at the specified level

Specified by:
check in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first object to place in the message
obj2 - second object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third Object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third Object to place in the message
obj4 - fourth Object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third Object to place in the message
obj4 - fourth Object to place in the message
obj5 - fifth Object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Object obj6)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third Object to place in the message
obj4 - fourth Object to place in the message
obj5 - fifth Object to place in the message
obj6 - sixth Object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Object obj6,
                java.lang.Object obj7)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third Object to place in the message
obj4 - fourth Object to place in the message
obj5 - fifth Object to place in the message
obj6 - sixth Object to place in the message
obj7 - seventh Object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Object obj6,
                java.lang.Object obj7,
                java.lang.Object obj8)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third Object to place in the message
obj4 - fourth Object to place in the message
obj5 - fifth Object to place in the message
obj6 - sixth Object to place in the message
obj7 - seventh Object to place in the message
obj8 - eighth Object to place in the message

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Throwable exception)
Log a message

Specified by:
log in class 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 obj1,
                java.lang.Object obj2,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
exception - An exception to be logged

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third object to place in the message
exception - An error message to be logged

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third object to place in the message
obj4 - fourth object to place in the message
exception - An exception to be logged

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third object to place in the message
obj4 - fourth object to place in the message
obj5 - fifth object to place in the message
exception - An exception to be logged

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Object obj6,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third object to place in the message
obj4 - fourth object to place in the message
obj5 - fifth object to place in the message
obj6 - sixth object to place in the message
exception - An exception to be logged

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Object obj6,
                java.lang.Object obj7,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third object to place in the message
obj4 - fourth object to place in the message
obj5 - fifth object to place in the message
obj6 - sixth object to place in the message
obj7 - seventh object to place in the message
exception - An exception to be logged

log

public void log(int level,
                java.lang.Object obj1,
                java.lang.Object obj2,
                java.lang.Object obj3,
                java.lang.Object obj4,
                java.lang.Object obj5,
                java.lang.Object obj6,
                java.lang.Object obj7,
                java.lang.Object obj8,
                java.lang.Throwable exception)
Log a message. Lazily appends Object parameters together.

Overrides:
log in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
obj1 - first Object to place in the message
obj2 - second Object to place in the message
obj3 - third object to place in the message
obj4 - fourth object to place in the message
obj5 - fifth object to place in the message
obj6 - sixth object to place in the message
obj7 - seventh object to place in the message
obj8 - eighth object to place in the message
exception - An exception to be logged

logFormatted

public void logFormatted(int level,
                         java.lang.String message,
                         java.lang.Object obj1)
Logs a formated message. The message itself may contain % characters as place holders. This routine will attempt to match the placeholder by looking at the type of parameter passed to obj1.

If the parameter is an array, it traverses the array first and matches parameters sequentially against the array items. Otherwise the parameters after message are matched in order.

If the place holder matches against a number it is printed as a whole number. This can be overridden by specifying a precision in the form %n.m where n is the padding for the whole part and m is the number of decimal places to display. n can be excluded if desired. n and m may not be more than 9.

If the last parameter (after flattening) is a Throwable it is logged specially.

Overrides:
logFormatted in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
message - The message to log.
obj1 - The first object to match against.

logFormatted

public void logFormatted(int level,
                         java.lang.String message,
                         java.lang.Object obj1,
                         java.lang.Object obj2)
Logs a formated message. The message itself may contain % characters as place holders. This routine will attempt to match the placeholder by looking at the type of parameter passed to obj1.

If the parameter is an array, it traverses the array first and matches parameters sequentially against the array items. Otherwise the parameters after message are matched in order.

If the place holder matches against a number it is printed as a whole number. This can be overridden by specifying a precision in the form %n.m where n is the padding for the whole part and m is the number of decimal places to display. n can be excluded if desired. n and m may not be more than 9.

If the last parameter (after flattening) is a Throwable it is logged specially.

Overrides:
logFormatted in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
message - The message to log.
obj1 - The first object to match against.
obj2 - The second object to match against.

logFormatted

public void logFormatted(int level,
                         java.lang.String message,
                         java.lang.Object obj1,
                         java.lang.Object obj2,
                         java.lang.Object obj3)
Logs a formated message. The message itself may contain % characters as place holders. This routine will attempt to match the placeholder by looking at the type of parameter passed to obj1.

If the parameter is an array, it traverses the array first and matches parameters sequentially against the array items. Otherwise the parameters after message are matched in order.

If the place holder matches against a number it is printed as a whole number. This can be overridden by specifying a precision in the form %n.m where n is the padding for the whole part and m is the number of decimal places to display. n can be excluded if desired. n and m may not be more than 9.

If the last parameter (after flattening) is a Throwable it is logged specially.

Overrides:
logFormatted in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
message - The message to log.
obj1 - The first object to match against.
obj2 - The second object to match against.
obj3 - The third object to match against.

logFormatted

public void logFormatted(int level,
                         java.lang.String message,
                         java.lang.Object obj1,
                         java.lang.Object obj2,
                         java.lang.Object obj3,
                         java.lang.Object obj4)
Logs a formated message. The message itself may contain % characters as place holders. This routine will attempt to match the placeholder by looking at the type of parameter passed to obj1.

If the parameter is an array, it traverses the array first and matches parameters sequentially against the array items. Otherwise the parameters after message are matched in order.

If the place holder matches against a number it is printed as a whole number. This can be overridden by specifying a precision in the form %n.m where n is the padding for the whole part and m is the number of decimal places to display. n can be excluded if desired. n and m may not be more than 9.

If the last parameter (after flattening) is a Throwable it is logged specially.

Overrides:
logFormatted in class POILogger
Parameters:
level - One of DEBUG, INFO, WARN, ERROR, FATAL
message - The message to log.
obj1 - The first object to match against.
obj2 - The second object to match against.
obj3 - The third object to match against.
obj4 - The forth object to match against.
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