Add doy's delegation fix to the change log

[gitmo/Moose.git] / lib / Moose / Meta / TypeConstraint / Registry.pm

diff --git a/lib/Moose/Meta/TypeConstraint/Registry.pm b/lib/Moose/Meta/TypeConstraint/Registry.pm
index c1414d0..c6a5b09 100644 (file)
--- a/lib/Moose/Meta/TypeConstraint/Registry.pm
+++ b/lib/Moose/Meta/TypeConstraint/Registry.pm
@@ -6,13 +6,20 @@ use warnings;
 use metaclass;
 
 use Scalar::Util 'blessed';
-use Carp         'confess';
+use Carp         'confess'; # FIXME Moose->throw_error
 
-our $VERSION   = '0.01';
+our $VERSION   = '0.68';
+$VERSION = eval $VERSION;
 our $AUTHORITY = 'cpan:STEVAN';
 
 use base 'Class::MOP::Object';
 
+__PACKAGE__->meta->add_attribute('parent_registry' => (
+    reader    => 'get_parent_registry',
+    writer    => 'set_parent_registry',    
+    predicate => 'has_parent_registry',    
+));
+
 __PACKAGE__->meta->add_attribute('type_constraints' => (
     reader  => 'type_constraints',
     default => sub { {} }
@@ -20,25 +27,37 @@ __PACKAGE__->meta->add_attribute('type_constraints' => (
 
 sub new { 
     my $class = shift;
-    my $self  = $class->meta->new_object(@_);
+    my $self  = $class->_new(@_);
     return $self;
 }
 
 sub has_type_constraint {
     my ($self, $type_name) = @_;
-    exists $self->type_constraints->{$type_name} ? 1 : 0
+    ($type_name and exists $self->type_constraints->{$type_name}) ? 1 : 0
 }
 
 sub get_type_constraint {
     my ($self, $type_name) = @_;
+    return unless defined $type_name; 
     $self->type_constraints->{$type_name}
 }
 
 sub add_type_constraint {
     my ($self, $type) = @_;
+    confess("No type supplied / type is not a valid type constraint") 
+        unless ($type && blessed $type && $type->isa('Moose::Meta::TypeConstraint'));
     $self->type_constraints->{$type->name} = $type;
 }
 
+sub find_type_constraint {
+    my ($self, $type_name) = @_;
+    return $self->get_type_constraint($type_name)
+        if $self->has_type_constraint($type_name);
+    return $self->get_parent_registry->find_type_constraint($type_name)
+        if $self->has_parent_registry;
+    return;
+}
+
 1;
 
 __END__
@@ -48,10 +67,16 @@ __END__
 
 =head1 NAME
 
-Moose::Meta::TypeConstraint::Registry
+Moose::Meta::TypeConstraint::Registry - registry for type constraints
 
 =head1 DESCRIPTION
 
+This module is currently only use internally by L<Moose::Util::TypeConstraints>. 
+It can be used to create your own private type constraint registry as well, but 
+the details of that are currently left as an exercise to the reader. (One hint: 
+You can use the 'parent_registry' feature to connect your private version with the 
+base Moose registry and base Moose types will automagically be found too).
+
 =head1 METHODS
 
 =over 4
@@ -60,13 +85,28 @@ Moose::Meta::TypeConstraint::Registry
 
 =item B<new>
 
+=item B<get_parent_registry>
+
+=item B<set_parent_registry ($registry)>
+    
+=item B<has_parent_registry>
+
 =item B<type_constraints>
 
-=item B<has_type_constraint>
+=item B<has_type_constraint ($type_name)>
+
+=item B<get_type_constraint ($type_name)>
+
+Returns a type constraint object from the registry by name. Will return
+false if the supplied type name cannot be found.
+
+=item B<add_type_constraint ($type)>
 
-=item B<get_type_constraint>
+Adds a type constraint object to the registry. Will throw an exception if
+no type is supplied, or the supplied object does not inherit from 
+L<Moose::Meta::TypeConstraint>
 
-=item B<add_type_constraint>
+=item B<find_type_constraint ($type_name)>
 
 =back
 
@@ -82,7 +122,7 @@ Stevan Little E<lt>stevan@iinteractive.comE<gt>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2006, 2007 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
 
 L<http://www.iinteractive.com>