X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FTypeConstraint.pm;h=13b44954c5042e659610816dcaf21f02d0db29fd;hp=7b584bfc74e703bc3fc16b152de8ffe176aa8a86;hb=a133bcea30632f3bdb815d5001e364675dc14028;hpb=684db121da77d6c63be5a58e33606907ca2aa4fb

diff --git a/lib/Mouse/Meta/TypeConstraint.pm b/lib/Mouse/Meta/TypeConstraint.pm
index 7b584bf..13b4495 100644
--- a/lib/Mouse/Meta/TypeConstraint.pm
+++ b/lib/Mouse/Meta/TypeConstraint.pm
@@ -1,9 +1,14 @@
 package Mouse::Meta::TypeConstraint;
 use strict;
 use warnings;
+
 use overload '""'     => sub { shift->{name} },   # stringify to tc name
              fallback => 1;
 
+use Carp ();
+
+use Mouse::Util qw(:meta);
+
 sub new {
     my $class = shift;
     my %args = @_;
@@ -14,7 +19,11 @@ sub new {
         $check = $check->{_compiled_type_constraint};
     }
 
-    bless +{ name => $name, _compiled_type_constraint => $check }, $class;
+    bless +{
+        name                      => $name,
+        _compiled_type_constraint => $check,
+        message                   => $args{message}
+    }, $class;
 }
 
 sub name { shift->{name} }
@@ -24,12 +33,58 @@ sub check {
     $self->{_compiled_type_constraint}->(@_);
 }
 
+sub validate {
+    my ($self, $value) = @_;
+    if ($self->{_compiled_type_constraint}->($value)) {
+        return undef;
+    }
+    else {
+        $self->get_message($value);
+    }
+}
+
+sub assert_valid {
+    my ($self, $value) = @_;
+
+    my $error = $self->validate($value);
+    return 1 if ! defined $error;
+
+    Carp::confess($error);
+}
+
+
+sub message {
+    return $_[0]->{message};
+}
+
+sub get_message {
+    my ($self, $value) = @_;
+    if ( my $msg = $self->message ) {
+        local $_ = $value;
+        return $msg->($value);
+    }
+    else {
+        $value = ( defined $value ? overload::StrVal($value) : 'undef' );
+        return
+            "Validation failed for '"
+          . $self->name
+          . "' failed with value $value";
+    }
+}
+
+sub is_a_type_of{
+    my($self, $tc_name) = @_;
+
+    return $self->name eq $tc_name
+        || $self->name =~ /\A $tc_name \[/xms; # "ArrayRef" =~ "ArrayRef[Foo]"
+}
+
 1;
 __END__
 
 =head1 NAME
 
-Mouse::Meta::TypeConstraint - The Mouse Type Constraint Metaclass
+Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
 
 =head1 DESCRIPTION
 
@@ -51,5 +106,9 @@ Don't use this.
 
 =back
 
+=head1 SEE ALSO
+
+L<Moose::Meta::TypeConstraint>
+
 =cut