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[gitmo/Moose.git] / lib / Moose / Meta / Attribute / Native / Trait / Counter.pm

package Moose::Meta::Attribute::Native::Trait::Counter;
use Moose::Role;

our $VERSION   = '0.87';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';

use Moose::Meta::Attribute::Native::MethodProvider::Counter;

with 'Moose::Meta::Attribute::Native::Trait';

has 'method_provider' => (
    is        => 'ro',
    isa       => 'ClassName',
    predicate => 'has_method_provider',
    default   => 'Moose::Meta::Attribute::Native::MethodProvider::Counter',
);

sub _default_default { 0 }
sub _default_is { 'ro' }
sub _helper_type { 'Num' }

after '_check_handles_values' => sub {
    my $self    = shift;
    my $handles = $self->handles;

    unless ( scalar keys %$handles ) {
        my $method_constructors = $self->method_constructors;
        my $attr_name           = $self->name;

        foreach my $method ( keys %$method_constructors ) {
            $handles->{ $method . '_' . $attr_name } = $method;
        }

        $self->_set_handles($handles);
    }
};

no Moose::Role;

1;

__END__

=pod

=head1 NAME

Moose::Meta::Attribute::Native::Trait::Counter

=head1 SYNOPSIS

  package MyHomePage;
  use Moose;
  use Moose::AttributeHelpers;

  has 'counter' => (
      metaclass => 'Counter',
      is        => 'ro',
      isa       => 'Num',
      default   => 0,
      handles   => {
          inc_counter   => 'inc',
          dec_counter   => 'dec',
          reset_counter => 'reset',
      }
  );

  my $page = MyHomePage->new();
  $page->inc_counter; # same as $page->counter( $page->counter + 1 );
  $page->dec_counter; # same as $page->counter( $page->counter - 1 );

=head1 DESCRIPTION

This module provides a simple counter attribute, which can be
incremented and decremented.

If your attribute definition does not include any of I<is>, I<isa>,
I<default> or I<handles> but does use the C<Counter> metaclass,
then this module applies defaults as in the L</SYNOPSIS>
above. This allows for a very basic counter definition:

  has 'foo' => (metaclass => 'Counter');
  $obj->inc_foo;

=head1 METHODS

=over 4

=item B<meta>

=item B<method_provider>

=item B<has_method_provider>

=back

=head1 PROVIDED METHODS

It is important to note that all those methods do in place
modification of the value stored in the attribute.

=over 4

=item I<set>

Set the counter to the specified value.

=item I<inc>

Increments the value stored in this slot by 1. Providing an argument will
cause the counter to be increased by specified amount.

=item I<dec>

Decrements the value stored in this slot by 1. Providing an argument will
cause the counter to be increased by specified amount.

=item I<reset>

Resets the value stored in this slot to it's default value.

=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 2007-2009 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