Provided by: libconfig-model-perl_2.117-1_all 
NAME
Config::Model::CheckList - Handle check list element
VERSION
version 2.117
SYNOPSIS
use Config::Model;
# define configuration tree object
my $model = Config::Model->new;
$model->create_config_class(
name => "MyClass",
element => [
# type check_list uses Config::Model::CheckList
my_check_list => {
type => 'check_list',
choice => [ 'A', 'B', 'C', 'D' ],
help => {
A => 'A effect is this',
D => 'D does that',
}
},
],
);
my $inst = $model->instance( root_class_name => 'MyClass' );
my $root = $inst->config_root;
# put data
$root->load( steps => 'my_check_list=A' );
my $obj = $root->grab('my_check_list');
my $v = $root->grab_value('my_check_list');
print "check_list value '$v' with help '", $obj->get_help($v), "'\n";
# more data
$obj->check('D');
$v = $root->grab_value('my_check_list');
print "check_list new value is '$v'\n"; # prints check_list new value is 'A,D'
DESCRIPTION
This class provides a check list element for a Config::Model::Node. In other words, this class provides
a list of booleans items. Each item can be set to 1 or 0.
The available items in the check list can be :
• A fixed list (with the "choice" parameter)
• A dynamic list where the available choice are the keys of another hash of the configuration tree. See
"Choice reference" for details.
CONSTRUCTOR
CheckList object should not be created directly.
CheckList model declaration
A check list element must be declared with the following parameters:
type
Always "checklist".
choice
A list ref containing the check list items (optional)
refer_to
This parameter is used when the keys of a hash are used to specify the possible choices of the check
list. "refer_to" point to a hash or list element in the configuration tree. See "Choice reference"
for details. (optional)
computed_refer_to
Like "refer_to", but use a computed value to find the hash or list element in the configuration tree.
See "Choice reference" for details. (optional)
default_list
List ref to specify the check list items which are "on" by default. (optional)
ordered
Specify whether the order of checked items must be preserved.
help
Hash ref to provide information on the check list items.
warp
Used to provide dynamic modifications of the check list properties See Config::Model::Warper for
details
For example:
• A simple check list with help:
choice_list
=> { type => 'check_list',
choice => ['A' .. 'Z'],
help => { A => 'A help', E => 'E help' } ,
},
• A check list with default values:
choice_list_with_default
=> { type => 'check_list',
choice => ['A' .. 'Z'],
default_list => [ 'A', 'D' ],
},
• A check list whose available choice and default change depending on the value of the "macro"
parameter:
'warped_choice_list'
=> { type => 'check_list',
warp => { follow => '- macro',
rules => { AD => { choice => [ 'A' .. 'D' ],
default_list => ['A', 'B' ] },
AH => { choice => [ 'A' .. 'H' ] },
}
}
},
Introspection methods
The following methods returns the checklist parameter :
refer_to
computed_refer_to
Choice reference
The choice items of a check_list can be given by another configuration element. This other element can
be:
• The keys of a hash
• Another checklist. In this case only the checked items of the other checklist are available.
This other hash or other checklist is indicated by the "refer_to" or "computed_refer_to" parameter.
"refer_to" uses the syntax of the "steps" parameter of grab(...)
See refer_to parameter.
Reference examples
• A check list where the available choices are the keys of "my_hash" configuration parameter:
refer_to_list
=> { type => 'check_list',
refer_to => '- my_hash'
},
• A check list where the available choices are the checked items of "other_check_list" configuration
parameter:
other_check_list => { type => 'check_list',
choice => [qw/A B C/]
},
refer_to_list
=> { type => 'check_list',
refer_to => '- other_check_list'
},
• A check list where the available choices are the keys of "my_hash" and "my_hash2" and "my_hash3"
configuration parameter:
refer_to_3_lists
=> { type => 'check_list',
refer_to => '- my_hash + - my_hash2 + - my_hash3'
},
• A check list where the available choices are the specified choice and the choice of
"refer_to_3_lists" and a hash whose name is specified by the value of the "indirection" configuration
parameter (this example is admittedly convoluted):
refer_to_check_list_and_choice
=> { type => 'check_list',
computed_refer_to => { formula => '- refer_to_2_list + - $var',
variables { 'var' => '- indirection ' }
},
choice => [qw/A1 A2 A3/],
},
Methods
get_type
Returns "check_list".
cargo_type()
Returns 'leaf'.
check ( ... )
Set choice. Parameter is either a list of choices to set or a list ref and some optional parameter. I.e:
check (\@list, check => 'skip') ;
"check" parameter decide on behavior in case of invalid choice value: either die (if yes) or discard bad
value (if skip)
uncheck (...)
Unset choice. Parameter is either a list of choices to unset or a list ref and some optional parameter.
I.e:
uncheck (\@list, check => 'skip') ;
"check" parameter decide on behavior in case of invalid choice value: either die (if yes) or discard bad
value (if skip)
is_checked( choice, [ check => yes|skip ] , [ mode => ... ])
Return 1 if the given "choice" was set. Returns 0 otherwise.
"check" parameter decide on behavior in case of invalid choice value: either die (if yes) or discard bad
value (if skip)
"mode" is either: custom standard preset default layered upstream_default
has_data
Return true if the check_list contains a set of checks different from default or upstream default set of
check.
get_choice
Returns an array of all items names that can be checked (i.e. that can have value 0 or 1).
get_help (choice_value)
Return the help string on this choice value
clear
Reset the check list (can also be called as "clear_values")
clear_item (choice_value)
Reset an element of the checklist.
get_checked_list_as_hash ( [ custom | preset | standard | default ] )
Returns a hash (or a hash ref) of all items. The boolean value is the value of the hash.
Example:
{ A => 0, B => 1, C => 0 , D => 1}
By default, this method returns all items set by the user, or items set in preset mode or checked by
default.
With a parameter, this method returns either:
custom
The list entered by the user. An empty list is returned if the list of checked items is identical to
the list of items checked by default. The whole list of checked items is returned as soon as one item
is different from standard value.
preset
The list entered in preset mode
standard
The list set in preset mode or checked by default.
default
The default list (defined by the configuration model)
layered
The list specified in layered mode.
upstream_default
The list implemented by upstream project (defined in the configuration model)
user
The set that is active in the application. (ie. set by user or by layered data or preset or default)
get_checked_list ( < mode > )
Returns a list (or a list ref) of all checked items (i.e. all items set to 1).
fetch ( < mode > )
Returns a string listing the checked items (i.e. "A,B,C")
get( path [, < mode> ] )
Get a value from a directory like path.
set( path , values )
Set a checklist with a directory like path. Since a checklist is a leaf, the path should be empty. The
values are a comma separated list of checked items.
Example : "$leaf->set('','A,C,Z') ;"
set_checked_list
Set all passed items to checked (1). All other available items in the check list are set to 0.
Example:
# set cl to A=0 B=1 C=0 D=1
$cl->set_checked_list('B','D')
store_set
Alias to "set_checked_list", so a list and a check_list can use the same store method
store
Set all items listed in a string to checked. The items must be separated by commas. All other available
items in the check list are set to 0.
Example:
$cl->store('B, D')
$cl->store( value => 'B,C' )
load
Alias to "store".
set_checked_list_as_hash ()
Set check_list items. Missing items in the given list of parameters are cleared (i.e. set to undef).
load_data ( ref )
Load check_list as an array or hash ref. Array is forwarded to set_checked_list , and hash is forwarded
to set_checked_list_as_hash.
Ordered checklist methods
All the methods below are valid only for ordered checklists.
swap ( choice_a, choice_b)
Swap the 2 given choice in the list. Both choice must be already set.
move_up ( choice )
Move the choice up in the checklist.
move_down ( choice )
Move the choice down in the checklist.
AUTHOR
Dominique Dumont, (ddumont at cpan dot org)
SEE ALSO
Config::Model, Config::Model::Instance, Config::Model::Node, Config::Model::AnyId, Config::Model::ListId,
Config::Model::HashId, Config::Model::Value
AUTHOR
Dominique Dumont
COPYRIGHT AND LICENSE
This software is Copyright (c) 2005-2018 by Dominique Dumont.
This is free software, licensed under:
The GNU Lesser General Public License, Version 2.1, February 1999