Merge branch 'master' into engine_traits

[gitmo/MooseX-Storage.git] / lib / MooseX / Storage / Basic.pm

package MooseX::Storage::Basic;
use Moose::Role;

use MooseX::Storage::Engine;

our $VERSION   = '0.18';
our $AUTHORITY = 'cpan:STEVAN';

sub pack {
    my ( $self, %args ) = @_;
    my $e = $self->_storage_get_engine_class(%args)->new( object => $self );
    $e->collapse_object(%args);
}

sub unpack {
    my ($class, $data, %args) = @_;
    my $e = $class->_storage_get_engine_class(%args)->new(class => $class);
    
    $class->_storage_construct_instance( 
        $e->expand_object($data, %args), 
        \%args 
    );
}

sub _storage_get_engine_class {
    my ($self, %args) = @_;

    my $default = 'MooseX::Storage::Engine';

    return $default
        unless (
            exists $args{engine_traits} 
         && ref($args{engine_traits}) eq 'ARRAY'
         && scalar(@{$args{engine_traits}})
    );
    
    my @roles = map { sprintf("%s::Trait::%s", $default, $_) }
        @{$args{engine_traits}};
    
    Moose::Meta::Class->create_anon_class(
        superclasses => [$default],
        roles => [ @roles ],
        cache => 1,
    )->name;
}

sub _storage_construct_instance {
    my ($class, $args, $opts) = @_;
    my %i = defined $opts->{'inject'} ? %{ $opts->{'inject'} } : ();
 
    $class->new( %$args, %i );
}

1;

__END__

=pod

=head1 NAME

MooseX::Storage::Basic - The simplest level of serialization

=head1 SYNOPSIS

  package Point;
  use Moose;
  use MooseX::Storage;
  
  our $VERSION = '0.01';
  
  with Storage;
  
  has 'x' => (is => 'rw', isa => 'Int');
  has 'y' => (is => 'rw', isa => 'Int');
  
  1;
  
  my $p = Point->new(x => 10, y => 10);
  
  ## methods to pack/unpack an 
  ## object in perl data structures
  
  # pack the class into a hash
  $p->pack(); # { __CLASS__ => 'Point-0.01', x => 10, y => 10 }
  
  # unpack the hash into a class
  my $p2 = Point->unpack({ __CLASS__ => 'Point-0.01', x => 10, y => 10 });
  
  # unpack the hash, with insertion of paramaters
  my $p3 = Point->unpack( $p->pack, inject => { x => 11 } );

=head1 DESCRIPTION

This is the most basic form of serialization. This is used by default 
but the exported C<Storage> function.

=head1 METHODS

=over 4

=item B<pack ([ disable_cycle_check => 1])>

Providing the C<disable_cycle_check> argument disables checks for any cyclical
references. The current implementation for this check is rather naive, so if
you know what you are doing, you can bypass this check.

This trait is applied on a perl-case basis. To set this flag for all objects
that inherit from this role, see L<MooseX::Storage::Traits::DisableCycleDetection>.

=item B<unpack ($data [, insert => { key => val, ... } ] )>

Providing the C<insert> argument let's you supply additional arguments to
the class' C<new> function, or override ones from the serialized data.

=back

=head2 Introspection

=over 4

=item B<meta>

=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

Chris Prather E<lt>chris.prather@iinteractive.comE<gt>

Stevan Little E<lt>stevan.little@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