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lib/Alzabo/Create/ForeignKey.pm  view on Meta::CPAN

package Alzabo::Create::ForeignKey;

use strict;
use vars qw($VERSION);

use Alzabo::Create;
use Alzabo::Exceptions ( abbr => 'params_exception' );
use Alzabo::Utils;

use Params::Validate qw( :all );
Params::Validate::validation_options
    ( on_fail => sub { params_exception join '', @_ } );

use base qw(Alzabo::ForeignKey);

$VERSION = 2.0;

1;

sub new
{
    my $proto = shift;
    my $class = ref $proto || $proto;

    validate( @_, { columns_from => { type => ARRAYREF | OBJECT },
                    columns_to   => { type => ARRAYREF | OBJECT },
                    cardinality  => { type => ARRAYREF },
                    from_is_dependent => { type => SCALAR },
                    to_is_dependent   => { type => SCALAR },
                    comment => { type => UNDEF | SCALAR,
                                 default => '' },
                  } );
    my %p = @_;

    my $self = bless {}, $class;

    $self->set_columns_from( $p{columns_from} );
    $self->set_columns_to( $p{columns_to} );

    $self->set_cardinality( @{ $p{cardinality} } );
    $self->set_from_is_dependent( $p{from_is_dependent} );
    $self->set_to_is_dependent( $p{to_is_dependent} );

    $self->set_comment( $p{comment} );

    return $self;
}

sub set_columns_from
{
    my $self = shift;

    my $c = Alzabo::Utils::is_arrayref( $_[0] ) ? shift : [ shift ];
    validate_pos( @$c, ( { isa => 'Alzabo::Create::Column' } ) x @$c );

    if ( exists $self->{columns_to} )
    {
        params_exception
            "The number of columns in each part of the relationship must be the same"
                unless @{ $self->{columns_to} } == @$c;
    }

    $self->{columns_from} = $c;
}

sub set_columns_to
{
    my $self = shift;

    my $c = Alzabo::Utils::is_arrayref( $_[0] ) ? shift : [ shift ];
    validate_pos( @$c, ( { isa => 'Alzabo::Create::Column' } ) x @$c );

    if ( exists $self->{columns_from} )
    {
        params_exception
            "The number of columns in each part of the relationship must be the same"
                unless @{ $self->{columns_from} } == @$c;
    }

    $self->{columns_to} = $c;
}

sub set_cardinality
{
    my $self = shift;

    my @card = @_;

    params_exception "Incorrect number of elements for cardinality"
        unless scalar @card == 2;

    foreach my $c ( @card )
    {
        params_exception "Invalid cardinality piece: $c"
            unless $c =~ /^[1n]$/i;
    }

    params_exception "Invalid cardinality: $card[0]..$card[1]"
        if $card[0] eq 'n' && $card[1] eq 'n';

    $self->{cardinality} = \@card;
}

sub set_from_is_dependent
{
    my $self = shift;

    $self->{from_is_dependent} = shift;
}

sub set_to_is_dependent
{
    my $self = shift;

    $self->{to_is_dependent} = shift;
}

sub set_comment { $_[0]->{comment} = defined $_[1] ? $_[1] : '' }

__END__

=head1 NAME

Alzabo::Create::ForeignKey - Foreign key objects for schema creation.

=head1 SYNOPSIS

  use Alzabo::Create::ForeignKey;

=for pod_merge DESCRIPTION