# man > Log::Log4perl::Config::BaseConfigurator

## NAME
    [Log::Log4perl::Config::BaseConfigurator](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3AConfig%3A%3ABaseConfigurator/markdown) - Configurator Base Class

## SYNOPSIS
    This is a virtual base class, all configurators should be derived from it.

## DESCRIPTION
  METHODS
    "new"
        Constructor, typically called like

            my $config_parser = SomeConfigParser->new(
                file => $file,
            );

            my $data = $config_parser->parse();

        Instead of "file", the derived class "SomeConfigParser" may define any type of configuration
        input medium (e.g. "url => '<http://foobar>'"). It just has to make sure its "parse()" method
        will later pull the input data from the medium specified.

        The base class accepts a filename or a reference to an array of text lines:

        "file"
            Specifies a file which the "parse()" method later parses.

        "text"
            Specifies a reference to an array of scalars, representing configuration records
            (typically lines of a file). Also accepts a simple scalar, which it splits at its
            newlines and transforms it into an array:

                my $config_parser = MyYAMLParser->new(
                    text => ['foo: bar',
                             'baz: bam',
                            ],
                );

                my $data = $config_parser->parse();

        If either "file" or "text" parameters have been specified in the constructor call, a later
        call to the configurator's "text()" method will return a reference to an array of
        configuration text lines. This will typically be used by the "parse()" method to process the
        input.

    "parse"
        Virtual method, needs to be defined by the derived class.

### Parser requirements
    *   If the parser provides variable substitution functionality, it has to implement it.

    *   The parser's "parse()" method returns a reference to a hash of hashes (HoH). The top-most
        hash contains the top-level keywords ("category", "appender") as keys, associated with
        values which are references to more deeply nested hashes.

    *   The "log4perl." prefix (e.g. as used in the PropertyConfigurator class) is stripped, it's
        not part in the HoH structure.

    *   Each Log4perl config value is indicated by the "value" key, as in

            $data->{category}->{Bar}->{Twix}->{value} = "WARN, Logfile"

  EXAMPLES
    The following [Log::Log4perl](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl/markdown) configuration:

        log4perl.category.Bar.Twix        = WARN, Screen
        log4perl.appender.Screen          = [Log::Log4perl::Appender::File](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3AAppender%3A%3AFile/markdown)
        log4perl.appender.Screen.filename = test.log
        log4perl.appender.Screen.layout   = [Log::Log4perl::Layout::SimpleLayout](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3ALayout%3A%3ASimpleLayout/markdown)

    needs to be transformed by the parser's "parse()" method into this data structure:

        { appender => {
            Screen  => {
              layout => {
                value  => "[Log::Log4perl::Layout::SimpleLayout](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3ALayout%3A%3ASimpleLayout/markdown)" },
                value  => "[Log::Log4perl::Appender::Screen](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3AAppender%3A%3AScreen/markdown)",
            },
          },
          category => {
            Bar => {
              Twix => {
                value => "WARN, Screen" }
            } }
        }

    For a full-fledged example, check out the sample YAML parser implementation in "eg/yamlparser".
    It uses a simple YAML syntax to specify the Log4perl configuration to illustrate the concept.

## SEE ALSO
    [Log::Log4perl::Config::PropertyConfigurator](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3AConfig%3A%3APropertyConfigurator/markdown)

    [Log::Log4perl::Config::DOMConfigurator](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3AConfig%3A%3ADOMConfigurator/markdown)

    [Log::Log4perl::Config::LDAPConfigurator](https://www.chedong.com/phpMan.php/perldoc/Log%3A%3ALog4perl%3A%3AConfig%3A%3ALDAPConfigurator/markdown) (tbd!)

## LICENSE
    Copyright 2002-2013 by Mike Schilli <<m@perlmeister.com>> and Kevin Goess <<cpan@goess.org>>.

    This library is free software; you can redistribute it and/or modify it under the same terms as
    Perl itself.

## AUTHOR
    Please contribute patches to the project on Github:

        <http://github.com/mschilli/log4perl>

    Send bug reports or requests for enhancements to the authors via our

    MAILING LIST (questions, bug reports, suggestions/patches): <log4perl-devel@lists.sourceforge.net>

    Authors (please contact them via the list above, not directly): Mike Schilli
    <<m@perlmeister.com>>, Kevin Goess <<cpan@goess.org>>

    Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens Berthold, Jeremy Bopp,
    Hutton Davidson, Chris R. Donnelly, Matisse Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon,
    Carl Franks, Dennis Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier David Hull,
    Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter, Brett Rann, Peter Rabbitson, Erik
    Selberg, Aaron Straup Cope, Lars Thegler, David Viner, Mac Yang.