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package Forest::Tree::Roles::MetaData;
use Moose::Role;
our $VERSION = '0.09';
our $AUTHORITY = 'cpan:STEVAN';
has 'metadata' => (
is => 'rw',
isa => 'HashRef',
default => sub { {} },
);
sub get_metadata_for {
my ($self, $key) = @_;
return $self->metadata->{$key};
}
sub fetch_metadata_for {
my ($self, $key) = @_;
my $current = $self;
do {
if ($current->does(__PACKAGE__)) {
my $meta = $current->metadata;
return $meta->{$key}
if exists $meta->{$key};
}
$current = $current->parent;
} until $current->is_root;
if ($current->does(__PACKAGE__)) {
my $meta = $current->metadata;
return $meta->{$key}
if exists $meta->{$key};
}
return;
}
no Moose::Role; 1;
__END__
=pod
=head1 NAME
Forest::Tree::Roles::MetaData - A role mixin to support tree node metadata
=head1 DESCRIPTION
This role mixin adds support for each tree node to have arbitrary metadata
stored in a HASHref. The metadata is inherited in the tree as well, so a child
will inherit the parents metadata.
This is really useful, at least for me it is :)
=head1 ATTRIBUTES
=over 4
=item I<metadata>
=back
=head1 METHODS
=over 4
=item B<fetch_metadata_for ($key)>
This will first check locally, if it doesn't fund anything then will climb
back to the root looking.
=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.little@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2008-2010 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
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