NAME¶

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

VERSION¶

version 2.021

SYNOPSIS¶

 use Config::Model;
 use Log::Log4perl qw(:easy);
 Log::Log4perl->easy_init($WARN);
 # define configuration tree object
 my $model = Config::Model->new;
  $model->create_config_class(
    name    => "Foo",
    element => [
        [qw/foo bar/] => {
            type       => 'leaf',
            value_type => 'string'
        },
    ]
 ); 
 
 $model ->create_config_class (
    name => "MyClass",
    element => [ 
        [qw/foo bar/] => {
            type       => 'leaf',
            value_type => 'string'
        },
        hash_of_nodes => {
            type       => 'hash',     # hash id
            index_type => 'string',
            cargo      => {
                type              => 'node',
                config_class_name => 'Foo'
            },
        },
        [qw/lista listb/] => { 
                              type => 'list',
                              cargo =>  {type => 'leaf',
                                         value_type => 'string'
                                        }
                              },
    ],
 ) ;
 my $inst = $model->instance(root_class_name => 'MyClass' );
 my $root = $inst->config_root ;
 # put data
 my $step = 'foo=FOO hash_of_nodes:fr foo=bonjour -
   hash_of_nodes:en foo=hello 
   ! lista=foo,bar lista:2=baz
     listb:0=foo listb:1=baz';
 $root->load( step => $step );
 print $root->describe,"\n" ;
 # name         value        type         comment                            
 # foo          FOO          string                                          
 # bar          [undef]      string                                          
 # hash_of_nodes <Foo>        node hash    keys: "en" "fr"                    
 # lista        foo,bar,baz  list                                            
 # listb        foo,baz      list                                            
 # delete some data
 $root->load( step => 'lista~2' );
 print $root->describe(element => 'lista'),"\n" ;
 # name         value        type         comment                            
 # lista        foo,bar      list                                            
 # append some data
 $root->load( step => q!hash_of_nodes:en foo.=" world"! );
 print $root->grab('hash_of_nodes:en')->describe(element => 'foo'),"\n" ;
 # name         value        type         comment                            
 # foo          "hello world" string

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 (also called "actions") 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/

Go down using "xxx" element and loop over the ids that match the regex. (For "hash")

 

For instance, with "OpenSsh" model, you could do

 

 Host=~/.*.debian.org/ user='foo-guest'
    

 

to set "foo-user" users for all your debian accounts.

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~

Undef element "xxx"

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".

 

Using "xxx=~/yy/=zz" is also possible.

xxx.=zzz

Will append "zzz" value to current values (valid for "leaf" elements).

xxx#zzz or xxx:yyy#zzz

Element annotation. Can be quoted or not quoted. Note that annotations are always placed at the end of an action item.

 

I.e. "foo#comment", "foo:bar#comment" or "foo:bar=baz#comment" are valid. "foo#comment:bar" is not valid.

Quotes¶

You can surround indexes and values with double quotes. E.g.:

  a_string="\"titi\" and \"toto\""

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.

check

Whether to check values while loading. Either "yes" (default), "no" or "skip". Loading with "skip" will discard bad values.

AUTHOR¶

Dominique Dumont, (ddumont at cpan dot org)

SEE ALSO¶

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