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Config::Model::Loader.3pm

NAME

Config::Model::Loader - Load serialized data into config tree

SYNOPSIS

  use Config::Model ;
 
  # create your config model
  my $model = Config::Model -> new ;
  $model->create_config_class( ... ) ;
 
  # create instance
  my $inst = $model->instance (root_class_name => 'FooBar', 
                               instance_name => 'test1');
 
  # create root of config
  my $root = $inst -> config_root ;
 
  # put some data in config tree
  my $step = 'std_id:ab X=Bv - std_id:bc X=Av - a_string="toto tata"';
  $root->load( step => $step ) ;
 
 

DESCRIPTION

This module is used directly by Config::Model::Node to load serialized configuration data into the configuration tree.

Serialized data can be written by the user or produced by Config::Model::Dumper while dumping data from a configuration tree.

CONSTRUCTOR

new ( )

No parameter. The constructor should be used only by Config::Model::Node.

load string syntax

The string is made of the following items separated by spaces:

-

Go up one node

!

Go to the root node of the configuration tree.

xxx

Go down using "xxx" element. (For "node" type element)

xxx:yy

Go down using "xxx" element and id "yy" (For "hash" or "list" element with "node" cargo_type)

xxx~yy

Delete item referenced by "xxx" element and id "yy". For a list, this is equivalent to "splice xxx,yy,1". This command does not go down in the tree (since it has just deleted the element). I.e. a '"-"' is generally not needed afterwards.

xxx=zz

Set element "xxx" to value "yy". load also accepts to set elements with a quoted string. (For "leaf" element)

For instance "foo="a quoted string"". Note that you cannot embed double quote in this string. I.e "foo="a \"quoted\" string"" will fail.

xxx=z1,z2,z3

Set list element "xxx" to list "z1,z2,z3". Use ",," for undef values, and "" for empty values.

I.e, for a list "('a',undef,'','c')", use "a,,"",c".

xxx:yy=zz

For "hash" element containing "leaf" cargo_type. Set the leaf identified by key "yy" to value "zz".

Methods

load ( ... )

Load data into the node tree (from the node passed with "node") and fill values as we go following the instructions passed with "step". ("step" can also be an array ref).

Parameters are:

node

node ref of the root of the tree (of sub-root) to start the load from.

step

A string or an array ref containing the steps to load. See above for a description of the string.

experience

Specify the experience level used during the load (default: "master"). The experience can be "intermediate advanced master". The load will raise an exception if the step of the load string tries to access an element with experience higher than user's experience.

AUTHOR

Dominique Dumont, (ddumont at cpan dot org)

SEE ALSO

Config::Model,Config::Model::Node,Config::Model::Dumper