NAME
Config::Model::CheckList - Handle check list element
VERSION
version 2.145
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 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
andmy_hash2
andmy_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 theindirection
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
Parameters: ( 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
Parameters: (choice_value)
Return the help string on this choice value
get_info
Returns a list of information related to the check list. See "get_info" in Config::Model::Value for more details.
clear
Reset the check list (can also be called as clear_values
)
clear_item
Parameters: (choice_value)
Reset an element of the checklist.
get_checked_list_as_hash
Accept a parameter (referred below as mode
parameter) similar to mode
in "fetch" in Config::Model::Value.
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 mode
parameter set to a value from the list below, this method returns:
- backend
-
The value written in config file, (ie. set by user or by layered data or preset or default)
- 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 or upstream_default)
- non_upstream_default
-
The choice set by user or by layered data or preset or default.
get_checked_list
Parameters: ( < mode > )
Returns a list (or a list ref) of all checked items (i.e. all items set to 1).
fetch
Parameters: ( < mode > )
Returns a string listing the checked items (i.e. "A,B,C")
get
Parameters: ( path [, < mode> ] )
Get a value from a directory like path.
Method to check or clear items in the check list
All these methods accept an optional check
parameter that can be:
- yes
-
A wrong item to check trigger an exception (default)
- skip
-
A wrong item trigger a warning
- no
-
A wrong item is ignored
set
Parameters: ( path, items_to_set, [ check => [ yes | no | skip ] ] )
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 items to set in the check list.
Example :
$leaf->set('','A,C,Z');
$leaf->set('','A,C,Z', check => 'skip');
set_checked_list
Set all passed items to checked (1). All other available items in the check list are set to 0.
Example, for a check list that contains A B C and D check items:
# set cl to A=0 B=1 C=0 D=1
$cl->set_checked_list('B','D')
$cl->set_checked_list( [ 'B','D' ])
$cl->set_checked_list( [ 'B','D' ], check => 'yes')
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' )
$cl->store( value => 'B,C', check => 'yes' )
load
Alias to "store".
set_checked_list_as_hash
Set check_list items. Missing items in the given hash of parameters are cleared (i.e. set to undef).
Example for a check list containing A B C D
$cl->set_checked_list_as_hash( { A => 1, B => 0} , check => 'yes' )
# result A => 1 B => 0 , C and D are undef
load_data
Load items as an array or hash ref. Array is forwarded to set_checked_list , and hash is forwarded to set_checked_list_as_hash.
Example:
$cl->load_data(['A','B']) # cannot use check param here
$cl->load_data( data => ['A','B'])
$cl->load_data( data => ['A','B'], check => 'yes')
$cl->load_data( { A => 1, B => 1 } )
$cl->load_data( data => { A => 1, B => 1 }, check => 'yes')
is_bad_mode
Accept a mode parameter. This function checks if the mode is accepted by "fetch" method. Returns an error message if not. For instance:
if (my $err = $val->is_bad_mode('foo')) {
croak "my_function: $err";
}
This method is intented as a helper ti avoid duplicating the list of accepted modes for functions that want to wrap fetch methods (like Config::Model::Dumper or Config::Model::DumpAsData)
Ordered checklist methods
All the methods below are valid only for ordered checklists.
swap
Parameters: ( choice_a, choice_b)
Swap the 2 given choice in the list. Both choice must be already set.
move_up
Parameters: ( choice )
Move the choice up in the checklist.
move_down
Parameters: ( 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) 2005-2021 by Dominique Dumont.
This is free software, licensed under:
The GNU Lesser General Public License, Version 2.1, February 1999