Config::Model::CheckList(3pm)				User Contributed Perl Documentation			     Config::Model::CheckList(3pm)

NAME

       Config::Model::CheckList - Handle check list element

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 => "MyClass",

	   element => [

	       # type check_list will use 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( step => '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), "'
";

	# more data
	$obj->check('D');
	$v = $root->grab_value('my_check_list');
	print "check_list new value is '$v'
";   # 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 :

       o   A fixed list (with the "choice" parameter)

       o   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::WarpedThing for details

       For example:

       o   A simple check list with help:

		  choice_list
		  => { type => 'check_list',
		       choice	  => ['A' .. 'Z'],
		       help => { A => 'A help', E => 'E help' } ,
		     },

       o   A check list with default values:

		  choice_list_with_default
		  => { type => 'check_list',
		       choice	  => ['A' .. 'Z'],
		       default_list   => [ 'A', 'D' ],
		     },

       o   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:

       o   The keys of a hash

       o   Another checklist. In this case only the checked items of the other checklist will be 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
       "step" parameter of grab(...)

       See refer_to parameter.

   Reference examples
       o   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'
		     },

       o   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'
		     },

       o   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'
		     },

       o   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

   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 (all items are set to 0) (can also be called as "clear_values")

   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 will return all items set by the user, or items set in preset mode or checked by default.

       With a parameter, this method will return either:

       custom
	   The list entered by the user

       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)

   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 ( item1, item2, ..)
       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')

   set_checked_list_as_hash ( A => 1, B => 1 )
       Set check_list items. Missing items in the given list of parameters are set to 0.

       The example ( A => 1, B => 1 ) above will give :

	A = 1 , B = 1, C = 0 , D = 0

   load_data ( list_ref )
       Load check_list as an array ref. Data is simply forwarded to set_checked_list.

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

perl v5.14.2							    2012-11-09					     Config::Model::CheckList(3pm)