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package Reaction::InterfaceModel::Collection;
use Reaction::Class;
use Scalar::Util qw/refaddr blessed/;
use aliased 'Reaction::Meta::InterfaceModel::Object::DomainModelAttribute';
# WARNING - DANGER: this is just an RFC, please DO NOT USE YET
class Collection is "Reaction::InterfaceModel::Object", which {
# consider supporting slice, first, iterator, last etc.
# pager functionality should probably be a role
# IM objects don't have write methods because those are handled through actions,
# no support for write actions either unless someone makes a good case for it
# many models may not even be writable, so we cant make that assumption...
# I feel like we should hasa result_class or object_class ?
# having this here would remove a lot of PITA complexity from
# ObjectClass and SchemaClass when it comes to munging with internals
#Answer: No, because collections should be able to hold more than one type of object
# ALL IMPLEMENTATIONS ARE TO ILLUSTRATE POSSIBLE BEHAVIOR ONLY. DON'T CONSIDER
# THEM CORRECT, OR FINAL. JUST A ROUGH DRAFT.
#domain_models are 'ro' unless otherwise specified
has _collection_store => (
is => 'rw',
isa => 'ArrayRef',
lazy_build => 1,
clearer => "_clear_collection_store",
metaclass => DomainModelAttribute,
);
implements _build_collection_store => as { [] };
implements members => as {
my $self = shift;
return @{ $self->_collection_store };
};
#return new member or it's index # ?
implements add_member => as {
my $self = shift;
my $new = shift;
confess "Argument passed is not an object" unless blessed $new;
confess "Object Passed does not meet constraint isa Reaction::InterfaceModel::Object"
unless $new->isa('Reaction::InterfaceModel::Object');
my $store = $self->_collection_store;
push @$store, $new;
return $#$store; #return index # of inserted item
};
implements remove_member => as {
my $self = shift;
my $rem = shift;
confess "Argument passed is not an object" unless blessed $rem;
confess "Object Passed does not meet constraint isa Reaction::InterfaceModel::Object"
unless $rem->isa('Reaction::InterfaceModel::Object');
my $addr = refaddr $rem;
@{ $self->_collection_store } = grep {$addr ne refaddr $_ } @{ $self->_store };
};
#that was easy..
implements count_members => sub{
my $self = shift;
return scalar @{ $self->_collection_store };
};
};
1;
=head1 NAME
Reaction::InterfaceModel::Collection - Generic collections of
C<Reaction::InterfaceModel::Object>s
=head1 DESCRIPTION
The base class for C<InterfaceModel::Collection>s. The functionality implemented here
is minimal and it is expected that specialized collections be built by sublclassing
this and exploiting the roles system.
=head1 METHODS
=head2 members
Returns a list containing all known members of the collection
=head2 add_member $object
Will add the object passed to the collection
=head2 remove_member $object
Removed the object passed from the collection, if present
=head2 count_members
Returns the number of objects in the collection.
=head1 ATTRIBUTES
=head2 _collection_store
Read-write & lazy_build. Holds the arrayref where the collection of objects is
presently stored. Has a clearer of C<_clear_collection_store> and a predicate of
C<_has_collection_store>.
=head1 PRIVATE METHODS
_build_collection_store
Builder method for attribute_collection_store, returns an empty arrayref
=head1 AUTHORS
See L<Reaction::Class> for authors.
=head1 LICENSE
See L<Reaction::Class> for the license.
=cut
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