use warnings;
use Carp 'confess';
-use Scalar::Util 'blessed', 'reftype';
+use Scalar::Util 'blessed', 'reftype', 'weaken';
-our $VERSION = '0.01';
+our $VERSION = '0.02';
sub meta {
require Class::MOP::Class;
writer => $options{writer},
predicate => $options{predicate},
init_arg => $options{init_arg},
- default => $options{default}
+ default => $options{default},
+ # keep a weakened link to the
+ # class we are associated with
+ associated_class => undef,
} => $class;
}
$self->{default};
}
-{
- # this is just a utility routine to
- # handle the details of accessors
- my $_inspect_accessor = sub {
- my ($attr_name, $type, $accessor) = @_;
-
- my %ACCESSOR_TEMPLATES = (
- 'accessor' => qq{sub {
- \$_[0]->{'$attr_name'} = \$_[1] if scalar(\@_) == 2;
- \$_[0]->{'$attr_name'};
- }},
- 'reader' => qq{sub {
- \$_[0]->{'$attr_name'};
- }},
- 'writer' => qq{sub {
- \$_[0]->{'$attr_name'} = \$_[1];
- }},
- 'predicate' => qq{sub {
- defined \$_[0]->{'$attr_name'} ? 1 : 0;
- }}
- );
-
- if (reftype($accessor) && reftype($accessor) eq 'HASH') {
- my ($name, $method) = each %{$accessor};
- return ($name, Class::MOP::Attribute::Accessor->wrap($method));
- }
- else {
- my $method = eval $ACCESSOR_TEMPLATES{$type};
- confess "Could not create the $type for $attr_name CODE(\n" . $ACCESSOR_TEMPLATES{$type} . "\n) : $@" if $@;
- return ($accessor => Class::MOP::Attribute::Accessor->wrap($method));
- }
- };
+# class association
- sub install_accessors {
- my ($self, $class) = @_;
- (blessed($class) && $class->isa('Class::MOP::Class'))
- || confess "You must pass a Class::MOP::Class instance (or a subclass)";
- $class->add_method(
- $_inspect_accessor->($self->name, 'accessor' => $self->accessor())
- ) if $self->has_accessor();
-
- $class->add_method(
- $_inspect_accessor->($self->name, 'reader' => $self->reader())
- ) if $self->has_reader();
-
- $class->add_method(
- $_inspect_accessor->($self->name, 'writer' => $self->writer())
- ) if $self->has_writer();
-
- $class->add_method(
- $_inspect_accessor->($self->name, 'predicate' => $self->predicate())
- ) if $self->has_predicate();
- return;
+sub associated_class { $_[0]->{associated_class} }
+
+sub attach_to_class {
+ my ($self, $class) = @_;
+ (blessed($class) && $class->isa('Class::MOP::Class'))
+ || confess "You must pass a Class::MOP::Class instance (or a subclass)";
+ weaken($self->{associated_class} = $class);
+}
+
+sub detach_from_class {
+ my $self = shift;
+ $self->{associated_class} = undef;
+}
+
+## Method generation helpers
+
+sub generate_accessor_method {
+ my ($self, $attr_name) = @_;
+ eval qq{sub {
+ \$_[0]->{'$attr_name'} = \$_[1] if scalar(\@_) == 2;
+ \$_[0]->{'$attr_name'};
+ }};
+}
+
+sub generate_reader_method {
+ my ($self, $attr_name) = @_;
+ eval qq{sub {
+ \$_[0]->{'$attr_name'};
+ }};
+}
+
+sub generate_writer_method {
+ my ($self, $attr_name) = @_;
+ eval qq{sub {
+ \$_[0]->{'$attr_name'} = \$_[1];
+ }};
+}
+
+sub generate_predicate_method {
+ my ($self, $attr_name) = @_;
+ eval qq{sub {
+ defined \$_[0]->{'$attr_name'} ? 1 : 0;
+ }};
+}
+
+sub process_accessors {
+ my ($self, $type, $accessor) = @_;
+ if (reftype($accessor) && reftype($accessor) eq 'HASH') {
+ my ($name, $method) = each %{$accessor};
+ return ($name, Class::MOP::Attribute::Accessor->wrap($method));
}
+ else {
+ my $generator = $self->can('generate_' . $type . '_method');
+ ($generator)
+ || confess "There is no method generator for the type='$type'";
+ if (my $method = $self->$generator($self->name)) {
+ return ($accessor => Class::MOP::Attribute::Accessor->wrap($method));
+ }
+ confess "Could not create the methods for " . $self->name . " because : $@";
+ }
+}
+
+sub install_accessors {
+ my $self = shift;
+ my $class = $self->associated_class;
+ $class->add_method(
+ $self->process_accessors('accessor' => $self->accessor())
+ ) if $self->has_accessor();
+
+ $class->add_method(
+ $self->process_accessors('reader' => $self->reader())
+ ) if $self->has_reader();
+
+ $class->add_method(
+ $self->process_accessors('writer' => $self->writer())
+ ) if $self->has_writer();
+
+ $class->add_method(
+ $self->process_accessors('predicate' => $self->predicate())
+ ) if $self->has_predicate();
+ return;
}
{
};
sub remove_accessors {
- my ($self, $class) = @_;
- (blessed($class) && $class->isa('Class::MOP::Class'))
- || confess "You must pass a Class::MOP::Class instance (or a subclass)";
- $_remove_accessor->($self->accessor(), $class) if $self->has_accessor();
- $_remove_accessor->($self->reader(), $class) if $self->has_reader();
- $_remove_accessor->($self->writer(), $class) if $self->has_writer();
- $_remove_accessor->($self->predicate(), $class) if $self->has_predicate();
+ my $self = shift;
+ $_remove_accessor->($self->accessor(), $self->associated_class()) if $self->has_accessor();
+ $_remove_accessor->($self->reader(), $self->associated_class()) if $self->has_reader();
+ $_remove_accessor->($self->writer(), $self->associated_class()) if $self->has_writer();
+ $_remove_accessor->($self->predicate(), $self->associated_class()) if $self->has_predicate();
return;
}
=back
+=head2 Class association
+
+=over 4
+
+=item B<associated_class>
+
+=item B<attach_to_class ($class)>
+
+=item B<detach_from_class>
+
+=back
+
=head2 Attribute Accessor generation
=over 4
-=item B<install_accessors ($class)>
+=item B<install_accessors>
This allows the attribute to generate and install code for it's own
I<accessor/reader/writer/predicate> methods. This is called by
C<Class::MOP::Class::add_attribute>.
-=item B<remove_accessors ($class)>
+This method will call C<process_accessors> for each of the possible
+method types (accessor, reader, writer & predicate).
+
+=item B<process_accessors ($type, $value)>
+
+This takes a C<$type> (accessor, reader, writer or predicate), and
+a C<$value> (the value passed into the constructor for each of the
+different types). It will then either generate the method itself
+(using the C<generate_*_method> methods listed below) or it will
+use the custom method passed through the constructor.
+
+=over 4
+
+=item B<generate_accessor_method ($attr_name)>
+
+=item B<generate_predicate_method ($attr_name)>
+
+=item B<generate_reader_method ($attr_name)>
+
+=item B<generate_writer_method ($attr_name)>
+
+=back
+
+=item B<remove_accessors>
This allows the attribute to remove the method for it's own
I<accessor/reader/writer/predicate>. This is called by
projects / gitmo/Class-MOP.git / blobdiff