lib/DX/ActionBuilder/Null.pm

   1 package DX::ActionBuilder::Null;
   2
   3 use DX::Class;
   4
   5 with 'DX::Role::ActionBuilder';
   6
   7 has target_path => (is => 'ro', isa => ValuePath);
   8
   9 sub can_set_value { 0 }
  10
  11 sub aperture_for_set_value { [] }
  12
  13 sub action_for_set_value { undef }
  14
  15 sub can_add_member { 0 }
  16
  17 sub aperture_for_add_member { [] }
  18
  19 sub action_for_add_member { undef }
  20
  21 sub aperure_for_set_member { [] }
  22
  23 sub action_for_set_member { undef }
  24
  25 sub aperture_for_remove_member { [] }
  26
  27 sub action_for_remove_member { undef }
  28
  29 sub specialize_for_member {
  30   my ($self, $at) = @_;
  31   return $self unless ref($self);
  32   return $self unless my $path = $self->target_path;
  33   return $self->but(
  34     target_path => [ @{$self->target_path}, $at ]
  35   );
  36 }
  37
  38 sub apply_to_value {
  39   my ($self, $value) = @_;
  40   my $new_value = $value->but_set_action_builder($self);
  41   return $new_value unless $new_value->isa('DX::Value::Dict');
  42   my %m = %{$new_value->members};
  43   return $new_value->but(
  44     members => {
  45       map +($_ => $self->specialize_for_member($_)->apply_to_value($m{$_})),
  46         keys %m,
  47     },
  48   );
  49 }
  50
  51 1;