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.IX Title "User::Identity::Collection 3"
.TH User::Identity::Collection 3 2025-12-14 "perl v5.42.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
User::Identity::Collection \- base class for collecting roles of a user
.SH INHERITANCE
.IX Header "INHERITANCE"
.Vb 2
\& User::Identity::Collection
\&   is a User::Identity::Item
\&
\& User::Identity::Collection is extended by
\&   User::Identity::Collection::Emails
\&   User::Identity::Collection::Locations
\&   User::Identity::Collection::Systems
\&   User::Identity::Collection::Users
.Ve
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 5
\&  use User::Identity;
\&  use User::Identity::Collection;
\&  my $me    = User::Identity\->new(...);
\&  my $set   = User::Identity::Collection::Emails\->new(...);
\&  $me\->addCollection($set);
\&
\&  # Simpler
\&  use User::Identity;
\&  my $me    = User::Identity\->new(...);
\&  my $set   = $me\->addCollection(type => \*(Aqemail\*(Aq, ...)
\&  my $set   = $me\->addCollection(\*(Aqemail\*(Aq, ...)
\&
\&  my @roles = $me\->collection(\*(Aqemail\*(Aq);  # list of collected items
\&
\&  my $coll  = $me\->collection(\*(Aqemail\*(Aq);  # a User::Identity::Collection
\&  my @roles = $coll\->roles;
\&  my @roles = @$coll;                    # same, by overloading
\&
\&  my $role  = $me\->collection(\*(Aqemail\*(Aq)\->find($coderef);
\&  my $role  = $me\->collection(\*(Aqlocation\*(Aq)\->find(\*(Aqwork\*(Aq);
\&  my $role  = $me\->find(location => \*(Aqwork\*(Aq);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
The \f(CW\*(C`User::Identity::Collection\*(C'\fR 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.
.PP
Currently imlemented extensions are
.IP \(bu 4
\&\fIpeople\fR is a collection of users
.IP \(bu 4
\&\fIwhereabouts\fR are locations
.IP \(bu 4
a \fImailinglist\fR is a
.Sp
collection of email addresses
.IP \(bu 4
a \fInetwork\fR contains
.Sp
groups of systems
.PP
Extends "DESCRIPTION" in User::Identity::Item.
.SH OVERLOADED
.IX Header "OVERLOADED"
.IP "overload: \fB""""\fR stringification" 4
.IX Item "overload: """" stringification"
Returns the name of the collection and a sorted list of defined items.
.Sp
» example:
.Sp
.Vb 1
\&  print "$collection\en";  #   location: home, work
.Ve
.IP "overload: \fB@{}\fR array dereference" 4
.IX Item "overload: @{} array dereference"
When the reference to a collection object is used as array\-reference, it
will be shown as list of roles.
.Sp
» example:
.Sp
.Vb 3
\&  my $locations = $ui\->collection(\*(Aqlocation\*(Aq);
\&  foreach my $loc (@$location) ...
\&  print $location\->[0];
.Ve
.SH METHODS
.IX Header "METHODS"
Extends "METHODS" in User::Identity::Item.
.SS Constructors
.IX Subsection "Constructors"
Extends "Constructors" in User::Identity::Item.
.ie n .IP "$class\->\fBnew\fR( [$name], %options )" 4
.el .IP "\f(CW$class\fR\->\fBnew\fR( [$name], \f(CW%options\fR )" 4
.IX Item "$class->new( [$name], %options )"

.Sp
.Vb 6
\& \-Option     \-\-Defined in          \-\-Default
\&  description  User::Identity::Item  undef
\&  item_type                          <required>
\&  name         User::Identity::Item  <required>
\&  parent       User::Identity::Item  undef
\&  roles                              undef
.Ve
.RS 4
.IP "description => STRING" 2
.IX Item "description => STRING"
.PD 0
.IP "item_type => CLASS" 2
.IX Item "item_type => CLASS"
.PD
The CLASS which is used to store the information for each of the maintained
objects within this collection.
.IP "name => STRING" 2
.IX Item "name => STRING"
.PD 0
.IP "parent => OBJECT" 2
.IX Item "parent => OBJECT"
.ie n .IP "roles => $role|\e@roles" 2
.el .IP "roles => \f(CW$role\fR|\e@roles" 2
.IX Item "roles => $role|@roles"
.PD
Immediately add some \f(CW@roles\fR to this collection.  In case of an ARRAY,
each element is passed separately to \fBaddRole()\fR. So, you may end\-up
with an ARRAY of ARRAYS each grouping a set of options to create a role.
.RE
.RS 4
.RE
.SS Attributes
.IX Subsection "Attributes"
Extends "Attributes" in User::Identity::Item.
.ie n .IP $obj\->\fBdescription\fR() 4
.el .IP \f(CW$obj\fR\->\fBdescription\fR() 4
.IX Item "$obj->description()"
Inherited, see "Attributes" in User::Identity::Item
.ie n .IP $obj\->\fBitemType\fR() 4
.el .IP \f(CW$obj\fR\->\fBitemType\fR() 4
.IX Item "$obj->itemType()"
Returns the type of the items collected.
.ie n .IP "$obj\->\fBname\fR( [$newname] )" 4
.el .IP "\f(CW$obj\fR\->\fBname\fR( [$newname] )" 4
.IX Item "$obj->name( [$newname] )"
Inherited, see "Attributes" in User::Identity::Item
.ie n .IP $obj\->\fBroles\fR() 4
.el .IP \f(CW$obj\fR\->\fBroles\fR() 4
.IX Item "$obj->roles()"
Returns all defined roles within this collection.  Be warned: the rules
are returned in random (hash) order.
.SS Collections
.IX Subsection "Collections"
Extends "Collections" in User::Identity::Item.
.ie n .IP "$obj\->\fBadd\fR($collection, $role)" 4
.el .IP "\f(CW$obj\fR\->\fBadd\fR($collection, \f(CW$role\fR)" 4
.IX Item "$obj->add($collection, $role)"
Inherited, see "Collections" in User::Identity::Item
.ie n .IP "$obj\->\fBaddCollection\fR( $object | <[$type], %options> )" 4
.el .IP "\f(CW$obj\fR\->\fBaddCollection\fR( \f(CW$object\fR | <[$type], \f(CW%options\fR> )" 4
.IX Item "$obj->addCollection( $object | <[$type], %options> )"
Inherited, see "Collections" in User::Identity::Item
.ie n .IP $obj\->\fBcollection\fR($name) 4
.el .IP \f(CW$obj\fR\->\fBcollection\fR($name) 4
.IX Item "$obj->collection($name)"
Inherited, see "Collections" in User::Identity::Item
.ie n .IP "$obj\->\fBparent\fR( [$parent] )" 4
.el .IP "\f(CW$obj\fR\->\fBparent\fR( [$parent] )" 4
.IX Item "$obj->parent( [$parent] )"
Inherited, see "Collections" in User::Identity::Item
.ie n .IP $obj\->\fBremoveCollection\fR($object|$name) 4
.el .IP \f(CW$obj\fR\->\fBremoveCollection\fR($object|$name) 4
.IX Item "$obj->removeCollection($object|$name)"
Inherited, see "Collections" in User::Identity::Item
.ie n .IP $any\->\fBtype\fR() 4
.el .IP \f(CW$any\fR\->\fBtype\fR() 4
.IX Item "$any->type()"
Inherited, see "Collections" in User::Identity::Item
.ie n .IP $obj\->\fBuser\fR() 4
.el .IP \f(CW$obj\fR\->\fBuser\fR() 4
.IX Item "$obj->user()"
Inherited, see "Collections" in User::Identity::Item
.SS "Maintaining roles"
.IX Subsection "Maintaining roles"
.ie n .IP "$obj\->\fBaddRole\fR($role|([$name], %options))" 4
.el .IP "\f(CW$obj\fR\->\fBaddRole\fR($role|([$name], \f(CW%options\fR))" 4
.IX Item "$obj->addRole($role|([$name], %options))"
Adds a new role to this collection.  \f(CW$role\fR is an object of the right type
(depends on the extension of this module which type that is) or a list
of \f(CW%options\fR which are used to create such role.  The options can also be
passed as reference to an ARRAY.  The added role is returned.
.Sp
» example:
.Sp
.Vb 1
\&  my $uicl = User::Identity::Collection::Locations\->new;
\&
\&  my $uil  = User::Identity::Location\->new(home => ...);
\&  $uicl\->addRole($uil);
\&  $uicl\->addRole(  home => address => \*(Aqstreet 32\*(Aq );
\&  $uicl\->addRole( [home => address => \*(Aqstreet 32\*(Aq] );
.Ve
.Sp
Easier
.Sp
.Vb 3
\&  $ui      = User::Identity;
\&  $ui\->add(location => \*(Aqhome\*(Aq, address => \*(Aqstreet 32\*(Aq );
\&  $ui\->add(location => [ \*(Aqhome\*(Aq, address => \*(Aqstreet 32\*(Aq ] );
.Ve
.ie n .IP $obj\->\fBremoveRole\fR($role|$name) 4
.el .IP \f(CW$obj\fR\->\fBremoveRole\fR($role|$name) 4
.IX Item "$obj->removeRole($role|$name)"
The deleted role is returned (if it existed).
.ie n .IP "$obj\->\fBrenameRole\fR( <$role|$oldname>, $newname )" 4
.el .IP "\f(CW$obj\fR\->\fBrenameRole\fR( <$role|$oldname>, \f(CW$newname\fR )" 4
.IX Item "$obj->renameRole( <$role|$oldname>, $newname )"
Give the role a different name, and move it in the collection.
.ie n .IP $obj\->\fBsorted\fR() 4
.el .IP \f(CW$obj\fR\->\fBsorted\fR() 4
.IX Item "$obj->sorted()"
Returns the roles sorted by name, alphabetically and case\-sensitive.
.SS Searching
.IX Subsection "Searching"
Extends "Searching" in User::Identity::Item.
.ie n .IP $obj\->\fBfind\fR($name|CODE|undef) 4
.el .IP \f(CW$obj\fR\->\fBfind\fR($name|CODE|undef) 4
.IX Item "$obj->find($name|CODE|undef)"
Find the object with the specified \f(CW$name\fR in this collection.  With \f(CW\*(C`undef\*(C'\fR,
a randomly selected role is returned.
.Sp
When a code reference is specified, all collected roles are scanned one
after the other (in unknown order).  For each role,
.Sp
.Vb 1
\&  CODE\->($object, $collection)
.Ve
.Sp
is called.  When the \f(CW\*(C`CODE\*(C'\fR returns \f(CW\*(C`true\*(C'\fR, 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.
Improves base, see "Searching" in User::Identity::Item
.Sp
» example:
.Sp
.Vb 2
\&  my $emails = $ui\->collection(\*(Aqemails\*(Aq);
\&  $emails\->find(\*(Aqwork\*(Aq);
\&
\&  sub find_work($$) {
\&     my ($mail, $emails) = @_;
\&     $mail\->location\->name eq \*(Aqwork\*(Aq;
\&  }
\&  my @at_work = $emails\->find(\e&find_work);
\&  my @at_work = $ui\->find(location => \e&find_work);
\&  my $any     = $ui\->find(location => undef );
.Ve
.SH DIAGNOSTICS
.IX Header "DIAGNOSTICS"
.ie n .IP "Error: cannot create a $type to add this to my collection." 4
.el .IP "Error: cannot create a \f(CW$type\fR to add this to my collection." 4
.IX Item "Error: cannot create a $type to add this to my collection."
Some options are specified to create a \f(CW$type\fR object, which is native to
this collection.  However, for some reason this failed.
Cast by \f(CWaddRole()\fR
.ie n .IP "Error: cannot load collection module for $type ($class): $@" 4
.el .IP "Error: cannot load collection module for \f(CW$type\fR ($class): $@" 4
.IX Item "Error: cannot load collection module for $type ($class): $@"
Either the specified \f(CW$type\fR does not exist, or that module named \f(CW$class\fR 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 \*(Aqrequire\*(Aq the package which defines the nickname.
Cast by \f(CWaddCollection()\fR
.ie n .IP "Error: cannot rename $from into $to: already exists." 4
.el .IP "Error: cannot rename \f(CW$from\fR into \f(CW$to:\fR already exists." 4
.IX Item "Error: cannot rename $from into $to: already exists."
Cast by \f(CWrenameRole()\fR
.ie n .IP "Error: cannot rename $from into $to: doesn\*(Aqt exist." 4
.el .IP "Error: cannot rename \f(CW$from\fR into \f(CW$to:\fR doesn\*(Aqt exist." 4
.IX Item "Error: cannot rename $from into $to: doesn't exist."
Cast by \f(CWrenameRole()\fR
.ie n .IP "Error: nvalid collection $name." 4
.el .IP "Error: nvalid collection \f(CW$name\fR." 4
.IX Item "Error: nvalid collection $name."
The collection with \f(CW$name\fR does not exist and can not be created.
Cast by \f(CWadd()\fR
.ie n .IP "Error: this $object is not a collection." 4
.el .IP "Error: this \f(CW$object\fR is not a collection." 4
.IX Item "Error: this $object is not a collection."
Cast by \f(CWaddCollection()\fR
.ie n .IP "Error: wrong type of role for $collection: requires a $expect but got a $type." 4
.el .IP "Error: wrong type of role for \f(CW$collection:\fR requires a \f(CW$expect\fR but got a \f(CW$type\fR." 4
.IX Item "Error: wrong type of role for $collection: requires a $expect but got a $type."
Each \f(CW$collection\fR groups sets of roles of one specific type (\f(CW$expect\fR).  You
cannot add objects of a different \f(CW$type\fR.
Cast by \f(CWaddRole()\fR
.SH "SEE ALSO"
.IX Header "SEE ALSO"
This module is part of User\-Identity version 4.00,
built on December 12, 2025. Website: \fIhttp://perl.overmeer.net/CPAN/\fR
.SH LICENSE
.IX Header "LICENSE"
For contributors see file ChangeLog.
.PP
This software is copyright (c) 2003\-2025 by Mark Overmeer.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.