If you want to delegate some methods to another object Class::Delegation can be of great help. For example if we have:

{
    package Foo;
    sub new { bless {}, shift };
    sub sane { 42 };
    sub insane { 666 };
};

[download]

We can make a SaneFoo class that forwards calls to the sane method to an internal Foo object like this:

{
    package SaneFoo;
    use Class::Delegation send => 'sane', to => 'Foo';
    
    sub new {
        bless { Foo => Foo->new }, shift;
    };
};

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Which does what we want:

use Test::More tests => 3;
use Test::Exception 0.15;

isa_ok my $o = SaneFoo->new, 'SaneFoo';
lives_and {is $o->sane, 42} 'sane worked';
dies_ok {$o->insane} 'insane failed';

__END__
# test results are:
1..3
ok 1 - The object isa SaneFoo
ok 2 - sane worked
ok 3 - insane failed

[download]

If you are worried about people burrowing into the SaneFoo object and extracting the Foo object from the hash you can always use Abigail-II's inside out objects. Using this style the SaneFoo class could be implemented like this:

{
    package SaneFoo;
    use Carp;
    
    my %Foo = ();
    
    sub new {
        my $self = bless {}, shift;
        $Foo{$self} = Foo->new;
        return($self);
    };
    
    sub allows {
        my ($self, $method) = @_;
        return( $method eq "sane" );
    };
    
    sub AUTOLOAD {
        my $self = shift;
        our $AUTOLOAD;
        my ($method) = ($AUTOLOAD =~ m/([^:]+)$/);
        croak "$self cannot $method" unless $self->allows($method);
        $Foo{$self}->$method;
    };
                        
    sub DESTROY {
        my $self = shift;
        delete $Foo{$self};
    };
};

[download]

Hope this helps.

In reply to Re: Filtering access to an Objects functions by adrianh
in thread Filtering access to an Objects functions by CTSMan

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