--- /dev/null
+
+package MooseX::AttributeHelpers::Trait::Collection::Bag;
+use Moose::Role;
+use Moose::Util::TypeConstraints;
+
+our $VERSION = '0.01';
+our $AUTHORITY = 'cpan:STEVAN';
+
+use MooseX::AttributeHelpers::MethodProvider::Bag;
+
+with 'MooseX::AttributeHelpers::Trait::Collection';
+
+has 'method_provider' => (
+ is => 'ro',
+ isa => 'ClassName',
+ predicate => 'has_method_provider',
+ default => 'MooseX::AttributeHelpers::MethodProvider::Bag'
+);
+
+subtype 'Bag' => as 'HashRef[Int]'
+ unless find_type_constraint('Bag');
+
+sub helper_type { 'Bag' }
+
+before 'process_options_for_provides' => sub {
+ my ($self, $options, $name) = @_;
+
+ # Set some default attribute options here unless already defined
+ if ((my $type = $self->helper_type) && !exists $options->{isa}){
+ $options->{isa} = $type;
+ }
+
+ $options->{default} = sub { +{} } unless exists $options->{default};
+};
+
+no Moose::Role;
+no Moose::Util::TypeConstraints;
+
+# register the alias ...
+package # hide me from search.cpan.org
+ Moose::Meta::Attribute::Custom::Trait::Collection::Bag;
+sub register_implementation {
+ 'MooseX::AttributeHelpers::Trait::Collection::Bag'
+}
+
+1;
+
+__END__
+
+=pod
+
+=head1 NAME
+
+MooseX::AttributeHelpers::Collection::Bag
+
+=head1 SYNOPSIS
+
+ package Stuff;
+ use Moose;
+ use MooseX::AttributeHelpers;
+
+ has 'word_histogram' => (
+ metaclass => 'Collection::Bag',
+ is => 'ro',
+ isa => 'Bag', # optional ... as is defalt
+ provides => {
+ 'add' => 'add_word',
+ 'get' => 'get_count_for',
+ 'empty' => 'has_any_words',
+ 'count' => 'num_words',
+ 'delete' => 'delete_word',
+ }
+ );
+
+=head1 DESCRIPTION
+
+This module provides a Bag attribute which provides a number of
+bag-like operations. See L<MooseX::AttributeHelpers::MethodProvider::Bag>
+for more details.
+
+=head1 METHODS
+
+=over 4
+
+=item B<meta>
+
+=item B<method_provider>
+
+=item B<has_method_provider>
+
+=item B<helper_type>
+
+=item B<process_options_for_provides>
+
+=back
+
+=head1 BUGS
+
+All complex software has bugs lurking in it, and this module is no
+exception. If you find a bug please either email me, or add the bug
+to cpan-RT.
+
+=head1 AUTHOR
+
+Stevan Little E<lt>stevan@iinteractive.comE<gt>
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright 2007-2008 by Infinity Interactive, Inc.
+
+L<http://www.iinteractive.com>
+
+This library is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
+