Log::NullLogLite - The Log::NullLogLite class implements the Null Object pattern for the Log::LogLite class.

  use Log::NullLogLite;

  # create new Log::NullLogLite object
  my $log = new Log::NullLogLite();

  ...

  # we had an error (this entry will not be written to the log 
  # file because we use Log::NullLogLite object).
  $log->write("Could not open the file ".$file_name.": $!", 4);

The Log::NullLogLite class is derived from the Log::LogLite class and implement the Null Object Pattern to let us to use the Log::LogLite class with null Log::LogLite objects. We might want to do that if we use a Log::LogLite object in our code, and we do not want always to actually define a Log::LogLite object (i.e. not always we want to write to a log file). In such a case we will create a Log::NullLogLite object instead of the Log::LogLite object, and will use that object instead. The object has all the methods that the Log::LogLite object has, but those methods do nothing. Thus our code will continue to run without any change, yet we will not have to define a log file path for the Log::LogLite object, and no log will be created.

new ( FILEPATH [,LEVEL [,DEFAULT_MESSAGE ]] )

The constructor. The parameters will not have any affect. Returns the new Log::NullLogLite object.

write( MESSAGE [, LEVEL ] )

Does nothing. The parameters will not have any affect. Returns nothing.

level( [ LEVEL ] )

Does nothing. The parameters will not have any affect. Returns -1.

default_message( [ MESSAGE ] )

Does nothing. The parameters will not have any affect. Returns empty string ("").

Rani Pinchuk, rani@cpan.org

Copyright (c) 2001-2002 Ockham Technology N.V. & Rani Pinchuk. All rights reserved. This package is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

Log::LogLite(3), The Null Object Pattern - Bobby Woolf - PLoP96 - published in Pattern Languages of Program Design 3 (http://cseng.aw.com/book/0,,0201310112,00.html)