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Manual Reference Pages  -  CONFIG::MODEL::ANYID (3)

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Config::Model::AnyId - Base class for hash or list element



version 2.082


 use Config::Model;

 # define configuration tree object
 my $model = Config::Model->new;
    name    => "Foo",
    element => [
        [qw/foo bar/] => {
            type       => leaf,
            value_type => string

    name    => "MyClass",
    element => [
        plain_hash => {
            type       => hash,
            index_type => string,
            cargo      => {
                type       => leaf,
                value_type => string,
        bounded_hash => {
            type       => hash,      # hash id
            index_type => integer,

            # hash boundaries
            min_index => 1, max_index => 123, max_nb => 2,

            # specify cargo held by hash
            cargo => {
                type       => leaf,
                value_type => string
        bounded_list => {
            type => list,    # list id

            max_index => 123,
            cargo     => {
                type       => leaf,
                value_type => string
        hash_of_nodes => {
            type       => hash,     # hash id
            index_type => string,
            cargo      => {
                type              => node,
                config_class_name => Foo

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

 my $root = $inst->config_root;

 # put data
 my $step = plain_hash:foo=boo bounded_list=foo,bar,baz
   bounded_hash:3=foo bounded_hash:30=baz
   hash_of_nodes:"foo node" foo="in foo node" -
   hash_of_nodes:"bar node" bar="in bar node" ;
 $root->load( step => $step );

 # dump resulting tree
 print $root->dump_tree;


This class provides hash or list elements for a Config::Model::Node.

The hash index can either be en enumerated type, a boolean, an integer or a string.


AnyId object should not be created directly.

Hash or list model declaration

A hash or list element must be declared with the following parameters:
type Mandatory element type. Must be hash or list to have a collection element. The actual element type must be specified by cargo = type> (See CAVEATS).
index_type Either integer or string. Mandatory for hash.
ordered Whether to keep the order of the hash keys (default no). (a bit like Tie::IxHash). The hash keys are ordered along their creation. The order can be modified with swap, move_up or move_down.
duplicates Specify the policy regarding duplicated values stored in the list or as hash values (valid only when cargo type is leaf). The policy can be allow (default), suppress, warn (which offers the possibility to apply a fix), forbid. Note that duplicates check cannot be performed when the duplicated value is stored: this happens outside of this object. Duplicates can be check only after when the value is read.
cargo Hash ref specifying the cargo held by the hash of list. This has must contain:
type Can be node or leaf (default).
config_class_name Specifies the type of configuration object held in the hash. Only valid when cargo type is node.
<other> Constructor arguments passed to the cargo object. See Config::Model::Node when cargo->type is node. See Config::Model::Value when cargo->type is leaf.
min_index Specify the minimum value (optional, only for hash and for integer index)
max_index Specify the maximum value (optional, only for list or for hash with integer index)
max_nb Specify the maximum number of indexes. (hash only, optional, may also be used with string index type)
default_keys When set, the default parameter (or set of parameters) are used as default keys hashes and created automatically when the keys or exists functions are used on an empty hash..

You can use default_keys => foo, or default_keys => [foo, bar].

default_with_init To perform special set-up on children nodes you can also use

   default_with_init =>  { foo => X=Av Y=Bv ,
                           bar => Y=Av Z=Cv }

When the hash contains leaves, you can also use:

   default_with_init => { def_1 => def_1 stuff ,
                          def_2 => def_2 stuff }

migrate_keys_from Specifies that the keys of the hash are copied from another hash in the configuration tree only when the hash is read for the first time after initial load (i.e. once the configuration files are completely read).

   migrate_keys_from => - another_hash

migrate_values_from Specifies that the values of the hash (or list) are copied from another hash (or list) in the configuration tree only when the hash (or list) is read for the first time after initial load (i.e. once the configuration files are completely read).

   migrate_values_from => - another_hash_or_list

follow_keys_from Specifies that the keys of the hash follow the keys of another hash in the configuration tree. In other words, the hash you’re creating will always have the same keys as the other hash.

   follow_keys_from => - another_hash

allow_keys Specifies authorized keys:

  allow_keys => [foo,bar,baz]

allow_keys_from A bit like the follow_keys_from parameters. Except that the hash pointed to by allow_keys_from specified the authorized keys for this hash.

  allow_keys_from => - another_hash

allow_keys_matching Keys must match the specified regular expression. For instance:

  allow_keys_matching => ^foo\d\d$

auto_create_keys When set, the default parameter (or set of parameters) are used as keys hashes and created automatically. (valid only for hash elements)

Called with auto_create_keys => [foo], or auto_create_keys => [foo, bar].

warn_if_key_match Issue a warning if the key matches the specified regular expression
warn_unless_key_match Issue a warning unless the key matches the specified regular expression
auto_create_ids Specifies the number of elements to create automatically. E.g. auto_create_ids => 4 will initialize the list with 4 undef elements. (valid only for list elements)
convert => [uc | lc ] The hash key will be converted to uppercase (uc) or lowercase (lc).
warp See Warp: dynamic value configuration below.

Warp: dynamic value configuration

The Warp functionality enables an HashId or ListId object to change its default settings (e.g. min_index, max_index or max_nb parameters) dynamically according to the value of another Value object. (See Config::Model::Warper for explanation on warp mechanism)

For instance, with this model:

 $model ->create_config_class
   name => Root,
   => [
       macro => { type => leaf,
                  value_type => enum,
                  name       => macro,
                  choice     => [qw/A B C/],
       warped_hash => { type => hash,
                        index_type => integer,
                        max_nb     => 3,
                        warp       => {
                                       follow => - macro,
                                       rules => { A => { max_nb => 1 },
                                                  B => { max_nb => 2 }
                        cargo => { type => node,
                                   config_class_name => Dummy

Setting macro to A will mean that warped_hash can only accept one instance of Dummy.

Setting macro to B will mean that warped_hash will accept two instances of Dummy.

Like other warped class, a HashId or ListId can have multiple warp masters (See Warp follow argument in Config::Model::Warper:

  warp => { follow => { m1 => - macro1,
                        m2 => - macro2
            rules  => [ $m1 eq "A" and $m2 eq "A2" => { max_nb => 1},
                        $m1 eq "A" and $m2 eq "B2" => { max_nb => 2}

    Warp and auto_create_ids or auto_create_keys

When a warp is applied with auto_create_keys or auto_create_ids parameter, the auto_created items are created if they are not already present. But this warp will never remove items that were previously auto created.

For instance, if a tied hash is created with auto_create => [a,b,c], the hash contains (a,b,c).

Then if a warp is applied with auto_create_keys => [c,d,e], the hash will contain (a,b,c,d,e). The items created by the first auto_create_keys are not removed.

    Warp and max_nb

When a warp is applied, the items that do not fit the constraint (e.g. min_index, max_index) are removed.

For the max_nb constraint, an exception will be raised if a warp leads to a number of items greater than the max_nb constraint.

Introspection methods

The following methods returns the current value stored in the Id object (as declared in the model unless they were warped):


Returns the object type contained by the hash or list (i.e. returns cargo -> type).

    get_cargo_info( < what > )

Returns more info on the cargo contained by the hash or list. what may be value_type or any other cargo info stored in the model. Will return undef if the requested info was not provided in the model.


Returns a list (or a list ref) of the current default keys. These keys can be set by the default_keys or default_with_init parameters or by the other hash pointed by follow_keys_from parameter.


Returns the object name. The name finishes with ’ id’.


Returns the config_class_name of collected elements. Valid only for collection of nodes.

This method will return undef if cargo type is not node.


Returns the number of fixes that can be applied to the current value.

Information management

fetch_with_id ( index => CW$idx , [ check => ’no’ ])

Fetch the collected element held by the hash or list. Index check is ’yes’ by default. Can be called with one parameter which will be used as index.


Get a value from a directory like path. Parameters are:
path Poor man’s version of XPath style path. This string is in the form:


Each word between the ’/’ is either an element name or a hash key or a list index.

mode Either default, custom, user,... See mode parameter in <Config::Model::Value/fetch( ... )>
check Either skip, no
get_obj If the path leads to a leaf, this parameter tell whether to return the stored value or the value object.
autoadd Whether to create missing keys
dir_char_mockup When the hash key used contains ’/’, (for instance a directory value), the key cannot be used as is with this method. Because ’/’ is already used to separate configuration items (this is also important with Config::Model::FuseUI). This parameter specifies how the forbidden ’/’ char is shown in the path. Default is <slash>

    set( path, value )

Set a value with a directory like path.

    copy ( from_index, to_index )

Deep copy an element within the hash or list. If the element contained by the hash or list is a node, all configuration information is copied from one node to another.


Returns an array containing all elements held by the hash or list.

    fetch_all_values( mode => ..., check => ...)

Returns an array containing all defined values held by the hash or list. (undefined values are simply discarded). This method is only valid for hash or list containing leaves.

With mode parameter, this method will return either:
custom The value entered by the user
preset The value entered in preset mode
standard The value entered in preset mode or checked by default.
default The default value (defined by the configuration model)


Returns an array containing all indexes of the hash or list. Hash keys are sorted alphabetically, except for ordered hashed.


Like fetch_all_indexes. This method is polymorphic for all non-leaf objects of the configuration tree.

    defined ( index )

Returns true if the value held at index is defined.

    exists ( index )

Returns true if the value held at index exists (i.e the key exists but the value may be undefined). This method may not make sense for list element.

    delete ( index )

Delete the indexed value


Delete all values (also delete underlying value or node objects).


Delete all values (without deleting underlying value objects).

    warning_msg ( [index] )

Returns warnings concerning indexes of this hash. Without parameter, returns a string containing all warnings or undef. With an index, return the warnings concerning this index or undef.


Returns the current number of warning.


Returns the error messages of this object (if any)


Dominique Dumont, ddumont [AT] cpan [DOT] org


Config::Model, Config::Model::Instance, Config::Model::Node, Config::Model::WarpedNode, Config::Model::HashId, Config::Model::ListId, Config::Model::CheckList, Config::Model::Value


Dominique Dumont


This software is Copyright (c) 2005-2016 by Dominique Dumont.

This is free software, licensed under:

  The GNU Lesser General Public License, Version 2.1, February 1999

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