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.\" ========================================================================
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.\" ========================================================================
.\"
.IX Title "Level 3"
.TH Level 3 "2010-10-27" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Log::Log4perl::Level \- Predefined log levels
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  use Log::Log4perl::Level;
\&  print $ERROR, "\en";
.Ve
.PP
.Vb 1
\&  # -- or --
.Ve
.PP
.Vb 2
\&  use Log::Log4perl qw(:levels);
\&  print $ERROR, "\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Log::Log4perl::Level\*(C'\fR simply exports a predefined set of \fILog4perl\fR log
levels into the caller's name space. It is used internally by 
\&\f(CW\*(C`Log::Log4perl\*(C'\fR. The following scalars are defined:
.PP
.Vb 8
\&    $OFF
\&    $FATAL
\&    $ERROR
\&    $WARN
\&    $INFO
\&    $DEBUG
\&    $TRACE
\&    $ALL
.Ve
.PP
\&\f(CW\*(C`Log::Log4perl\*(C'\fR also exports these constants into the caller's namespace
if you pull it in providing the \f(CW\*(C`:levels\*(C'\fR tag:
.PP
.Vb 1
\&    use Log::Log4perl qw(:levels);
.Ve
.PP
This is the preferred way, there's usually no need to call 
\&\f(CW\*(C`Log::Log4perl::Level\*(C'\fR explicitely.
.PP
The numerical values assigned to these constants are purely virtual,
only used by Log::Log4perl internally and can change at any time,
so please don't make any assumptions.
.PP
If the caller wants to import these constants into a different namespace,
it can be provided with the \f(CW\*(C`use\*(C'\fR command:
.PP
.Vb 1
\&    use Log::Log4perl::Level qw(MyNameSpace);
.Ve
.PP
After this \f(CW$MyNameSpace::ERROR\fR, \f(CW$MyNameSpace::INFO\fR etc. 
will be defined accordingly.
.Sh "Numeric levels and Strings"
.IX Subsection "Numeric levels and Strings"
Level variables like \f(CW$DEBUG\fR or \f(CW$WARN\fR have numeric values that are 
internal to Log4perl. Transform them to strings that can be used
in a Log4perl configuration file, use the c<\fIto_level()\fR> function
provided by Log::Log4perl::Level:
.PP
.Vb 2
\&    use Log::Log4perl qw(:easy);
\&    use Log::Log4perl::Level;
.Ve
.PP
.Vb 2
\&        # prints "DEBUG"
\&    print Log::Log4perl::Level::to_level( $DEBUG ), "\en";
.Ve
.PP
To perform the reverse transformation, which takes a string like
\&\*(L"\s-1DEBUG\s0\*(R" and converts it into a constant like \f(CW$DEBUG\fR, use the
\&\fIto_priority()\fR function:
.PP
.Vb 2
\&    use Log::Log4perl qw(:easy);
\&    use Log::Log4perl::Level;
.Ve
.PP
.Vb 1
\&    my $numval = Log::Log4perl::Level::to_priority( "DEBUG" );
.Ve
.PP
after which \f(CW$numval\fR could be used where a numerical value is required:
.PP
.Vb 1
\&    Log::Log4perl->easy_init( $numval );
.Ve
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2002\-2009 by Mike Schilli <m@perlmeister.com> 
and Kevin Goess <cpan@goess.org>.
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.