1Config::BaseConfiguratoUrs(e3r)Contributed Perl DocumentCaotnifoing::BaseConfigurator(3)
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NAME

6       Log::Log4perl::Config::BaseConfigurator - Configurator Base Class
7

SYNOPSIS

9       This is a virtual base class, all configurators should be derived from
10       it.
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DESCRIPTION

13   METHODS
14       "new"
15           Constructor, typically called like
16
17               my $config_parser = SomeConfigParser->new(
18                   file => $file,
19               );
20
21               my $data = $config_parser->parse();
22
23           Instead of "file", the derived class "SomeConfigParser" may define
24           any type of configuration input medium (e.g. "url =>
25           'http://foobar'").  It just has to make sure its "parse()" method
26           will later pull the input data from the medium specified.
27
28           The base class accepts a filename or a reference to an array of
29           text lines:
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31           "file"
32               Specifies a file which the "parse()" method later parses.
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34           "text"
35               Specifies a reference to an array of scalars, representing
36               configuration records (typically lines of a file). Also accepts
37               a simple scalar, which it splits at its newlines and transforms
38               it into an array:
39
40                   my $config_parser = MyYAMLParser->new(
41                       text => ['foo: bar',
42                                'baz: bam',
43                               ],
44                   );
45
46                   my $data = $config_parser->parse();
47
48           If either "file" or "text" parameters have been specified in the
49           constructor call, a later call to the configurator's "text()"
50           method will return a reference to an array of configuration text
51           lines.  This will typically be used by the "parse()" method to
52           process the input.
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54       "parse"
55           Virtual method, needs to be defined by the derived class.
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57   Parser requirements
58       ·   If the parser provides variable substitution functionality, it has
59           to implement it.
60
61       ·   The parser's "parse()" method returns a reference to a hash of
62           hashes (HoH).  The top-most hash contains the top-level keywords
63           ("category", "appender") as keys, associated with values which are
64           references to more deeply nested hashes.
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66       ·   The "log4perl." prefix (e.g. as used in the PropertyConfigurator
67           class) is stripped, it's not part in the HoH structure.
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69       ·   Each Log4perl config value is indicated by the "value" key, as in
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71               $data->{category}->{Bar}->{Twix}->{value} = "WARN, Logfile"
72
73   EXAMPLES
74       The following Log::Log4perl configuration:
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76           log4perl.category.Bar.Twix        = WARN, Screen
77           log4perl.appender.Screen          = Log::Log4perl::Appender::File
78           log4perl.appender.Screen.filename = test.log
79           log4perl.appender.Screen.layout   = Log::Log4perl::Layout::SimpleLayout
80
81       needs to be transformed by the parser's "parse()" method into this data
82       structure:
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84           { appender => {
85               Screen  => {
86                 layout => {
87                   value  => "Log::Log4perl::Layout::SimpleLayout" },
88                   value  => "Log::Log4perl::Appender::Screen",
89               },
90             },
91             category => {
92               Bar => {
93                 Twix => {
94                   value => "WARN, Screen" }
95               } }
96           }
97
98       For a full-fledged example, check out the sample YAML parser
99       implementation in "eg/yamlparser". It uses a simple YAML syntax to
100       specify the Log4perl configuration to illustrate the concept.
101

SEE ALSO

103       Log::Log4perl::Config::PropertyConfigurator
104
105       Log::Log4perl::Config::DOMConfigurator
106
107       Log::Log4perl::Config::LDAPConfigurator (tbd!)
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110       Copyright 2002-2009 by Mike Schilli <m@perlmeister.com> and Kevin Goess
111       <cpan@goess.org>.
112
113       This library is free software; you can redistribute it and/or modify it
114       under the same terms as Perl itself.
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118perl v5.12.2                      2010-08-31       Config::BaseConfigurator(3)
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