Provided by: libuser-identity-perl_0.99-1_all bug


       User::Identity::Collection - base class for collecting roles of a user


          is an User::Identity::Item

        User::Identity::Collection is extended by


        use User::Identity;
        use User::Identity::Collection;
        my $me    = User::Identity->new(...);
        my $set   = User::Identity::Collection::Emails->new(...);

        # Simpler
        use User::Identity;
        my $me    = User::Identity->new(...);
        my $set   = $me->addCollection(type => 'email', ...)
        my $set   = $me->addCollection('email', ...)

        my @roles = $me->collection('email');  # list of collected items

        my $coll  = $me->collection('email');  # a User::Identity::Collection
        my @roles = $coll->roles;
        my @roles = @$coll;                    # same, by overloading

        my $role  = $me->collection('email')->find($coderef);
        my $role  = $me->collection('location')->find('work');
        my $role  = $me->find(location => 'work');


       The "User::Identity::Collection" object maintains a set user related objects.  It helps
       selecting these objects, which is partially common to all collections (for instance, each
       object has a name so you can search on names), and sometimes specific to the extension of
       this collection.

       Currently imlemented extensions are

       ·   people is a collection of users

       ·   whereabouts are locations

       ·   a mailinglist is a

           collection of email addresses

       ·   a network contains

           groups of systems

       Extends "DESCRIPTION" in User::Identity::Item.


       overload: @{}
           When the reference to a collection object is used as array-reference, it will be shown
           as list of roles.


            my $locations = $ui->collection('location');
            foreach my $loc (@$location) ...
            print $location->[0];

       overload: stringification
           Returns the name of the collection and a sorted list of defined items.


            print "$collection\n";  #   location: home, work


       Extends "METHODS" in User::Identity::Item.

       Extends "Constructors" in User::Identity::Item.

       User::Identity::Collection->new( [$name], %options )
            -Option     --Defined in          --Default
             description  User::Identity::Item  undef
             item_type                          <required>
             name         User::Identity::Item  <required>
             parent       User::Identity::Item  undef
             roles                              undef

           description => STRING
           item_type => CLASS
             The CLASS which is used to store the information for each of the maintained objects
             within this collection.

           name => STRING
           parent => OBJECT
           roles => ROLE|ARRAY
             Immediately add some roles to this collection.  In case of an ARRAY, each element of
             the array is passed separately to addRole(). So, you may end-up with an ARRAY of
             arrays each grouping a set of options to create a role.

       Extends "Attributes" in User::Identity::Item.

           Inherited, see "Attributes" in User::Identity::Item

           Returns the type of the items collected.

       $obj->name( [$newname] )
           Inherited, see "Attributes" in User::Identity::Item

           Returns all defined roles within this collection.  Be warned: the rules are returned
           in random (hash) order.

       Extends "Collections" in User::Identity::Item.

       $obj->add($collection, $role)
           Inherited, see "Collections" in User::Identity::Item

       $obj->addCollection( $object | <[$type], %options> )
           Inherited, see "Collections" in User::Identity::Item

           Inherited, see "Collections" in User::Identity::Item

       $obj->parent( [$parent] )
           Inherited, see "Collections" in User::Identity::Item

           Inherited, see "Collections" in User::Identity::Item

           Inherited, see "Collections" in User::Identity::Item

           Inherited, see "Collections" in User::Identity::Item

   Maintaining roles
       $obj->addRole($role| <[$name],%options> | ARRAY)
           Adds a new role to this collection.  $role is an object of the right type (depends on
           the extension of this module which type that is) or a list of %options which are used
           to create such role.  The options can also be passed as reference to an ARRAY.  The
           added role is returned.


            my $uicl = User::Identity::Collection::Locations->new;

            my $uil  = User::Identity::Location->new(home => ...);

            $uicl->addRole( home => address => 'street 32' );
            $uicl->addRole( [home => address => 'street 32'] );


            $ui      = User::Identity;
            $ui->add(location => 'home', address => 'street 32' );
            $ui->add(location => [ 'home', address => 'street 32' ] );

           The deleted role is returned (if it existed).

       $obj->renameRole( <$role|$oldname>, $newname )
           Give the role a different name, and move it in the collection.

           Returns the roles sorted by name, alphabetically and case-sensitive.

       Extends "Searching" in User::Identity::Item.

           Find the object with the specified $name in this collection.  With "undef", a randomly
           selected role is returned.

           When a code reference is specified, all collected roles are scanned one after the
           other (in unknown order).  For each role,

            CODE->($object, $collection)

           is called.  When the CODE returns true, the role is selected.  In list context, all
           selected roles are returned.  In scalar context, the first match is returned and the
           scan is aborted immediately.


            my $emails = $ui->collection('emails');

            sub find_work($$) {
               my ($mail, $emails) = @_;
               $mail->location->name eq 'work';
            my @at_work = $emails->find(\&find_work);
            my @at_work = $ui->find(location => \&find_work);
            my $any     = $ui->find(location => undef );


       Error: $object is not a collection.
           The first argument is an object, but not of a class which extends

       Error: Cannot create a $type to add this to my collection.
           Some options are specified to create a $type object, which is native to this
           collection.  However, for some reason this failed.

       Error: Cannot load collection module for $type ($class).
           Either the specified $type does not exist, or that module named $class returns
           compilation errors.  If the type as specified in the warning is not the name of a
           package, you specified a nickname which was not defined.  Maybe you forgot the
           'require' the package which defines the nickname.

       Error: Cannot rename $name into $newname: already exists
       Error: Cannot rename $name into $newname: doesn't exist
       Error: Creation of a collection via $class failed.
           The $class did compile, but it was not possible to create an object of that class
           using the options you specified.

       Error: Don't know what type of collection you want to add.
           If you add a collection, it must either by a collection object or a list of options
           which can be used to create a collection object.  In the latter case, the type of
           collection must be specified.

       Warning: No collection $name
           The collection with $name does not exist and can not be created.

       Error: Wrong type of role for $collection: requires a $expect but got a $type
           Each $collection groups sets of roles of one specific type ($expect).  You cannot add
           objects of a different $type.


       This module is part of User-Identity distribution version 0.99, built on January 24, 2018.


       Copyrights 2003-2018 by [Mark Overmeer]. For other contributors see ChangeLog.

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.  See