NAME

Config::Model::Backend::Yaml - Read and write config as a YAML data structure

VERSION

version 1.246

SYNOPSIS

 use Config::Model ;
 use Log::Log4perl qw(:easy) ;
 use Data::Dumper ;

 Log::Log4perl->easy_init($WARN);

 # define configuration tree object
 my $model = Config::Model->new ;
 $model ->create_config_class (
    name => "MyClass",
    element => [ 
        [qw/foo bar/] => { 
            type => 'leaf',
            value_type => 'string'
        },
        baz => { 
            type => 'hash',
            index_type => 'string' ,
            cargo => {
                type => 'leaf',
                value_type => 'string',
            },
        },
    ],
  read_config  => [
                    { backend => 'yaml' , 
                      config_dir => '/tmp',
                      file  => 'foo.yml',
                      auto_create => 1,
                    }
                  ],
 ) ;

 my $inst = $model->instance(root_class_name => 'MyClass' );

 my $root = $inst->config_root ;

 my $step = 'foo=yada bar="bla bla" baz:en=hello
             baz:fr=bonjour baz:hr="dobar dan"';
 $root->load( step => $step ) ;
 $inst->write_back ;

Now, /tmp/foo.yml contains:

 ---
 bar: bla bla
 baz:
   en: hello
   fr: bonjour
   hr: dobar dan
 foo: yada

DESCRIPTION

This module is used directly by Config::Model to read or write the content of a configuration tree written with YAML syntax in Config::Model configuration tree.

Note that undefined values are skipped for list element. I.e. if a list element contains ('a',undef,'b'), the data structure will contain 'a','b'.

CONSTRUCTOR

new ( node => $node_obj, name => 'yaml' ) ;

Inherited from Config::Model::Backend::Any. The constructor will be called by Config::Model::AutoRead.

read ( io_handle => ... )

Of all parameters passed to this read call-back, only io_handle is used. This parameter must be IO::File object already opened for read.

It can also be undef. In this case, read() will return 0.

When a file is read, read() will return 1.

write ( io_handle => ... )

Of all parameters passed to this write call-back, only io_handle is used. This parameter must be IO::File object already opened for write.

write() will return 1.

AUTHOR

Dominique Dumont, (ddumont at cpan dot org)

SEE ALSO

Config::Model, Config::Model::AutoRead, Config::Model::Backend::Any,