1 package MooseX::Singleton::Role::Meta::Method::Constructor;
5 if ( $Moose::VERSION < 1.9900 ) {
6 override _initialize_body => sub {
10 # the %options should also include a both
11 # a call 'initializer' and call 'SUPER::'
12 # options, which should cover approx 90%
13 # of the possible use cases (even if it
14 # requires some adaption on the part of
15 # the author, after all, nothing is free)
17 $source .= "\n" . 'my $class = shift;';
20 . 'my $existing = do { no strict "refs"; no warnings "once"; \${"$class\::singleton"}; };';
21 $source .= "\n" . 'return ${$existing} if ${$existing};';
23 $source .= "\n" . 'return $class->Moose::Object::new(@_)';
27 . $self->associated_metaclass->name . '\';';
29 $source .= $self->_generate_params( '$params', '$class' );
30 $source .= $self->_generate_instance( '$instance', '$class' );
31 $source .= $self->_generate_slot_initializers;
33 $source .= ";\n" . $self->_generate_triggers();
34 $source .= ";\n" . $self->_generate_BUILDALL();
36 $source .= ";\n" . 'return ${$existing} = $instance';
37 $source .= ";\n" . '}';
38 warn $source if $self->options->{debug};
40 my $attrs = $self->_attributes;
43 = map { $_->can('type_constraint') ? $_->type_constraint : undef }
46 my @type_constraint_bodies
47 = map { defined $_ ? $_->_compiled_type_constraint : undef; }
50 my $defaults = [map { $_->default } @$attrs];
52 my ( $code, $e ) = $self->_compile_code(
57 '$defaults' => \$defaults,
58 '@type_constraints' => \@type_constraints,
59 '@type_constraint_bodies' => \@type_constraint_bodies,
64 "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$e",
65 error => $e, data => $source )
68 $self->{'body'} = $code;
72 # Ideally we'd be setting this in the constructor, but the new() methods in
73 # what the parent classes are not well-factored.
75 # This is all a nasty hack, though. We need to fix Class::MOP::Inlined to
76 # allow constructor class roles to say "if the parent class has role X,
78 override _expected_method_class => sub {
81 my $super_value = super();
82 if ( $super_value eq 'Moose::Object' ) {
83 for my $parent ( map { Class::MOP::class_of($_) }
84 $self->associated_metaclass->superclasses ) {
86 if $parent->is_anon_class
87 && grep { $_->name eq 'Moose::Object' }
88 map { Class::MOP::class_of($_) } $parent->superclasses;
99 # ABSTRACT: Constructor method role for MooseX::Singleton
107 This role overrides the generated object C<new> method so that it returns the
108 singleton if it already exists.