a bit more configurability

diff --git a/lib/Object/Builder.pm b/lib/Object/Builder.pm
index 2f27771..2cbe0e0 100644 (file)
--- a/lib/Object/Builder.pm
+++ b/lib/Object/Builder.pm
@@ -8,16 +8,20 @@ our $VERSION = '0.000001'; # 0.0.1
 $VERSION = eval $VERSION;
 
 has class => (
-  is => 'rw', required => 1,
+  is => 'rw', lazy => 1, builder => 1,
   trigger => sub { shift->_clear_final_class },
 );
 
+sub _build_class { die "No default class set" }
+
 has roles => (
-  is => 'rw', builder => 1,
+  is => 'rw', lazy => 1, builder => 1,
   trigger => sub { shift->_clear_final_class },
   clearer => 'reset_roles',
 );
 
+after reset_roles => sub { shift->_clear_final_class };
+
 sub _build_roles { [] }
 
 has _final_class => (is => 'lazy', clearer => 1);
@@ -43,6 +47,8 @@ has arguments => (
   clearer => 'reset_arguments',
 );
 
+after reset_arguments => sub { shift->_clear_final_arguments };
+
 sub _build_arguments { {} }
 
 has argument_filter => (
@@ -69,6 +75,16 @@ sub _build_object {
   $self->_final_class->${\$self->constructor}($self->_final_arguments);
 }
 
+sub BUILD {
+  my ($self, $args) = @_;
+  unless (
+    $args->{object} or $args->{class}
+    or ($self->can('_build_class') ne __PACKAGE__->can('_build_class')
+  ) {
+    die "No static object passed, and no class supplied or defaulted";
+  }
+}
+
 1;
 
 =head1 NAME