ch16.024_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 16 of "Perl Best Practices"   ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;


my $new_client = Client::Corporate->new( )
    -> set_client_name('Humperdinck')
    -> set_corp_name ('Florin')
    -> set_position('CEO')
    -> Client::set_client_num ('124C1')
    -> Client::Corporate::set_client_num('F_1692')
    ;



package Client;
use Class::Std::Utils;
use Carp;
{
    my %client_num_of;
    my %name_of;

 
    sub new {
        my ($class) = @_;
        croak q{Can't initialize in constructor (use accessors)} if @_ > 1;
 
        # [Set up purely internal state here]
 
        return bless anon_scalar(), $class;   
    }

    sub set_client_name {
        my ($self, $name) = @_;
        $name_of{ident $self} = $name;
        return $self;
    }

    sub set_client_num {
        my ($self, $num) = @_;
        $client_num_of{ident $self} = $num;
        return $self;
    }

    # etc.
    END { 
        use Data::Dumper 'Dumper';
        warn Dumper [ \%client_num_of, \%name_of ];
    }
}
 
package Client::Corporate;
use base qw( Client );
use Class::Std::Utils;
{
    my %client_num_of;
    my %corporation_of;
    my %position_of; 
 
    sub set_client_num {
        my ($self, $num) = @_;
        $client_num_of{ident $self} = $num;
        return $self;
    }

    sub set_corp_name {
        my ($self, $corp) = @_;
        $corporation_of{ident $self} = $corp;
        return $self;
    }

    sub set_position {
        my ($self, $pos) = @_;
        $position_of{ident $self} = $pos;
        return $self;
    }

    # etc.
    END { 
        use Data::Dumper 'Dumper';
        warn Dumper [ \%client_num_of, \%corporation_of, \%position_of ];
    }
}