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package Reaction::Role::Meta::Attribute;
use Moose::Role;
#is => 'Bool' ? or leave it open
has lazy_fail =>
(is => 'ro', reader => 'is_lazy_fail', required => 1, default => 0);
around legal_options_for_inheritance => sub {
return (shift->(@_), qw/valid_values/);
};
around _process_options => sub {
my $super = shift;
my ($class, $name, $options) = @_;
my $fail = $options->{lazy_fail};
if ( $fail ) {
confess("You may not use both lazy_build and lazy_fail for one attribute")
if $fail && $options->{lazy_build};
$options->{lazy} = 1;
$options->{required} = 1;
$options->{default} = sub { confess "${name} must be provided before calling reader" };
}
#we are using this everywhere so might as well move it here.
$options->{predicate} ||= ($name =~ /^_/) ? "_has${name}" : "has_${name}"
if !$options->{required} || $options->{lazy};
$super->($class, $name, $options);
};
foreach my $type (qw(clearer predicate)) {
my $value_meth = do {
if ($type eq 'clearer') {
'clear_value'
} elsif ($type eq 'predicate') {
'has_value'
} else {
confess "NOTREACHED";
}
};
__PACKAGE__->meta->add_method("get_${type}_method" => sub {
my $self = shift;
my $info = $self->$type;
return $info unless ref $info;
my ($name) = %$info;
return $name;
});
__PACKAGE__->meta->add_method("get_${type}_method_ref" => sub {
my $self = shift;
if ((my $name = $self->${\"get_${type}_method"}) && $self->associated_class) {
return $self->associated_class->get_method($name);
} else {
return sub { $self->$value_meth(@_); }
}
});
}
1;
__END__;
=head1 NAME
Reaction::Meta::Attribute
=head1 SYNOPSIS
has description => (is => 'rw', isa => 'Str', lazy_fail => 1);
=head1 Method-naming conventions
Reaction::Meta::Attribute will never override the values you set for method names,
but if you do not it will follow these basic rules:
Attributes with a name that starts with an underscore will default to using
builder and predicate method names in the form of the attribute name preceeded by
either "_has" or "_build". Otherwise the method names will be in the form of the
attribute names preceeded by "has_" or "build_". e.g.
#auto generates "_has_description" and expects "_build_description"
has _description => (is => 'rw', isa => 'Str', lazy_fail => 1);
#auto generates "has_description" and expects "build_description"
has description => (is => 'rw', isa => 'Str', lazy_fail => 1);
=head2 Predicate generation
All non-required or lazy attributes will have a predicate automatically
generated for them if one is not already specified.
=head2 lazy_fail
lazy_fail will fail if it is called without first having set the value.
=head1 AUTHORS
See L<Reaction::Class> for authors.
=head1 LICENSE
See L<Reaction::Class> for the license.
=cut
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