X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMooseX%2FAttributeHelpers%2FCounter.pm;h=38d98751e03bcbca082ab86c685d2183be3f1db8;hb=refs%2Ftags%2F0.17;hp=3bce3b0e271f1493abf36de458a2035e5833a83a;hpb=22d869ff05be971ebf7b672c8f9cbec6151e8d82;p=gitmo%2FMooseX-AttributeHelpers.git

diff --git a/lib/MooseX/AttributeHelpers/Counter.pm b/lib/MooseX/AttributeHelpers/Counter.pm
index 3bce3b0..38d9875 100644
--- a/lib/MooseX/AttributeHelpers/Counter.pm
+++ b/lib/MooseX/AttributeHelpers/Counter.pm
@@ -1,66 +1,52 @@
 
 package MooseX::AttributeHelpers::Counter;
 use Moose;
-use Moose::Util::TypeConstraints;
 
-our $VERSION   = '0.01';
+our $VERSION   = '0.17';
+$VERSION = eval $VERSION;
 our $AUTHORITY = 'cpan:STEVAN';
 
-extends 'Moose::Meta::Attribute';
-
-my %METHOD_CONSTRUCTORS = (
-    inc => sub {
-        my $attr = shift;
-        return sub { $attr->set_value($_[0], $attr->get_value($_[0]) + 1) };
-    },
-    dec => sub {
-        my $attr = shift;
-        return sub { $attr->set_value($_[0], $attr->get_value($_[0]) - 1) };        
-    },
-);
+use MooseX::AttributeHelpers::MethodProvider::Counter;
+
+extends 'MooseX::AttributeHelpers::Base';
 
-has 'provides' => (
-    is       => 'ro',
-    isa      => subtype('HashRef' => where { 
-        (exists $METHOD_CONSTRUCTORS{$_} || return) for keys %{$_}; 1;
-    }),
-    required => 1,
+has '+method_provider' => (
+    default => 'MooseX::AttributeHelpers::MethodProvider::Counter'
 );
 
-has '+$!default'       => (required => 1);
-has '+type_constraint' => (required => 1);
+sub helper_type { 'Num' }
 
-before '_process_options' => sub {
-    my ($self, %options) = @_;
-    
-    if (exists $options{provides}) {
-        (exists $options{isa})
-            || confess "You must define a type with the Counter metaclass";  
-             
-        (find_type_constraint($options{isa})->is_subtype_of('Num'))
-            || confess "The type constraint for a Counter must be a subtype of Num";
+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->{is}      = 'ro' unless exists $options->{is};
+    $options->{default} = 0    unless exists $options->{default};
 };
 
-after 'install_accessors' => sub {
-    my $attr  = shift;
-    my $class = $attr->associated_class;
-    
-    foreach my $key (keys %{$attr->provides}) {
-        (exists $METHOD_CONSTRUCTORS{$key})
-            || confess "Unsupported method type ($key)";
-        $class->add_method(
-            $attr->provides->{$key}, 
-            $METHOD_CONSTRUCTORS{$key}->($attr)
-        );
+after 'check_provides_values' => sub {
+    my $self     = shift;
+    my $provides = $self->provides;
+
+    unless (scalar keys %$provides) {
+        my $method_constructors = $self->method_constructors;
+        my $attr_name           = $self->name;
+        
+        foreach my $method (keys %$method_constructors) {
+            $provides->{$method} = ($method . '_' . $attr_name);
+        }
     }
 };
 
 no Moose;
-no Moose::Util::TypeConstraints;
 
 # register the alias ...
-package Moose::Meta::Attribute::Custom::Counter;
+package # hide me from search.cpan.org
+    Moose::Meta::Attribute::Custom::Counter;
 sub register_implementation { 'MooseX::AttributeHelpers::Counter' }
 
 1;
@@ -77,24 +63,86 @@ MooseX::AttributeHelpers::Counter
 
   package MyHomePage;
   use Moose;
+  use MooseX::AttributeHelpers;
   
   has 'counter' => (
       metaclass => 'Counter',
-      is        => 'rw',
-      isa       => 'Int',
+      is        => 'ro',
+      isa       => 'Num',
       default   => sub { 0 },
       provides  => {
           inc => 'inc_counter',
+          dec => 'dec_counter',          
+          reset => 'reset_counter',
       }
   );
 
   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 decremeneted. 
+
+If your attribute definition does not include any of I<is>, I<isa>,
+I<default> or I<provides> 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>
+
+=item B<helper_type>
+
+=item B<process_options_for_provides>
+
+Run before its superclass method.
+
+=item B<check_provides_values>
+
+Run after its superclass method.
+
+=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 
@@ -107,11 +155,11 @@ Stevan Little E<lt>stevan@iinteractive.comE<gt>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2007 by Infinity Interactive, Inc.
+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
\ No newline at end of file
+=cut