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Meta.pm
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Meta.pm
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package ObjectDB::Meta;
use strict;
use warnings;
use mro;
our $VERSION = '3.07';
require Storable;
require Carp;
use List::Util qw(first);
use ObjectDB::Meta::RelationshipFactory;
my %OBJECTS;
sub find_or_register_meta {
my $class = shift;
my ($meta_class, @args) = @_;
return $OBJECTS{$meta_class} ||=
ObjectDB::Meta->new(class => $meta_class, @args);
}
sub new {
my $class = shift;
my (%params) = @_;
Carp::croak('Class is required when building meta') unless $params{class};
if (my $parent = $class->_is_inheriting($params{class})) {
return $parent;
}
Carp::croak('Table is required when building meta') unless $params{table};
my $self = {
class => $params{class},
table => $params{table}
};
bless $self, $class;
$self->set_columns($params{columns});
$self->set_primary_key($params{primary_key}) if $params{primary_key};
$self->set_unique_keys($params{unique_keys}) if $params{unique_keys};
$self->set_auto_increment($params{auto_increment})
if $params{auto_increment};
$self->_build_relationships($params{relationships});
if ($params{generate_columns_methods}) {
$self->generate_columns_methods;
}
if ($params{generate_related_methods}) {
$self->generate_related_methods;
}
return $self;
}
sub class { $_[0]->{class} }
sub table { $_[0]->{table} }
sub relationships { $_[0]->{relationships} }
sub column { shift->get_column(@_); }
sub columns { $_[0]->get_columns; }
sub primary_key { $_[0]->get_primary_key; }
sub auto_increment { $_[0]->get_auto_increment; }
sub is_primary_key {
my $self = shift;
my ($name) = @_;
return !!first { $name eq $_ } $self->get_primary_key;
}
sub is_unique_key {
my $self = shift;
my ($name) = @_;
foreach my $key (@{$self->{unique_keys}}) {
return 1 if first { $name eq $_ } @$key;
}
return 0;
}
sub get_class {
my $self = shift;
return $self->{class};
}
sub get_table {
my $self = shift;
return $self->{table};
}
sub set_table {
my $self = shift;
my ($value) = @_;
$self->{table} = $value;
return $self;
}
sub is_column {
my $self = shift;
my ($name) = @_;
Carp::croak('Name is required') unless $name;
return !!first { $name eq $_->{name} } @{$self->{columns}};
}
sub get_column {
my $self = shift;
my ($name) = @_;
Carp::croak("Unknown column '$name'") unless $self->is_column($name);
return first { $_->{name} eq $name } @{$self->{columns}};
}
sub get_columns {
my $self = shift;
return map { $_->{name} } @{$self->{columns}};
}
sub get_regular_columns {
my $self = shift;
my @columns;
foreach my $column ($self->get_columns) {
next if first { $column eq $_ } $self->get_primary_key;
push @columns, $column;
}
return @columns;
}
sub set_columns {
my $self = shift;
$self->{columns} = [];
$self->add_columns(@_);
return $self;
}
sub add_columns {
my $self = shift;
my (@columns) = @_ == 1 && ref $_[0] eq 'ARRAY' ? @{$_[0]} : @_;
my $count = 0;
while (my ($name, $options) = @columns[$count, $count + 1]) {
last unless $name;
if (ref $options eq 'HASH') {
$self->add_column($name, $options);
}
else {
$self->add_column($name);
$count++;
next;
}
$count += 2;
}
return $self;
}
sub add_column {
my $self = shift;
my ($name, $attributes) = @_;
Carp::croak('Name is required') unless $name;
Carp::croak("Column '$name' already exists") if $self->is_column($name);
$attributes ||= {};
push @{$self->{columns}}, {name => $name, %$attributes};
return $self;
}
sub remove_column {
my $self = shift;
my ($name) = @_;
return unless $name && $self->is_column($name);
$self->{columns} = [grep { $_->{name} ne $name } @{$self->{columns}}];
return $self;
}
sub get_primary_key {
my $self = shift;
return @{$self->{primary_key} || []};
}
sub set_primary_key {
my $self = shift;
my (@columns) = @_ == 1 && ref $_[0] eq 'ARRAY' ? @{$_[0]} : @_;
foreach my $column (@columns) {
Carp::croak("Unknown column '$column'")
unless $self->is_column($column);
}
$self->{primary_key} = [@columns];
return $self;
}
sub get_unique_keys {
my $self = shift;
return @{$self->{unique_keys}};
}
sub set_unique_keys {
my $self = shift;
my (@columns) = @_ == 1 && ref $_[0] eq 'ARRAY' ? @{$_[0]} : @_;
$self->{unique_keys} = [];
$self->add_unique_keys(@columns);
return $self;
}
sub add_unique_keys {
my $self = shift;
my (@columns) = @_ == 1 && ref $_[0] eq 'ARRAY' ? @{$_[0]} : @_;
foreach my $column (@columns) {
$self->add_unique_key($column);
}
return $self;
}
sub add_unique_key {
my $self = shift;
my (@columns) = @_ == 1 && ref $_[0] eq 'ARRAY' ? @{$_[0]} : @_;
foreach my $column (@columns) {
Carp::croak("Unknown column '$column'")
unless $self->is_column($column);
}
push @{$self->{unique_keys}}, [@columns];
return $self;
}
sub get_auto_increment {
my $self = shift;
return $self->{auto_increment};
}
sub set_auto_increment {
my $self = shift;
my ($column) = @_;
Carp::croak("Unknown column '$column'") unless $self->is_column($column);
$self->{auto_increment} = $column;
return $self;
}
sub is_relationship {
my $self = shift;
my ($name) = @_;
return exists $self->{relationships}->{$name};
}
sub get_relationship {
my $self = shift;
my ($name) = @_;
Carp::croak("Unknown relationship '$name'")
unless exists $self->{relationships}->{$name};
return $self->{relationships}->{$name};
}
sub add_relationship {
my $self = shift;
my ($name, $options) = @_;
Carp::croak('Name and options are required') unless $name && $options;
$self->{relationships}->{$name} =
ObjectDB::Meta::RelationshipFactory->new->build(
$options->{type}, %{$options},
orig_class => $self->get_class,
name => $name
);
}
sub add_relationships {
my $self = shift;
my $count = 0;
while (my ($name, $options) = @_[$count, $count + 1]) {
last unless $name && $options;
$self->add_relationship($name, $options);
$count += 2;
}
}
sub generate_columns_methods {
my $self = shift;
no strict 'refs';
no warnings 'redefine';
foreach my $column ($self->get_columns) {
*{$self->class . '::' . $column} =
sub { shift->column($column, @_) };
}
return $self;
}
sub generate_related_methods {
my $self = shift;
no strict 'refs';
no warnings 'redefine';
foreach my $rel_name (keys %{$self->relationships}) {
*{$self->class . '::' . $rel_name} =
sub { shift->related($rel_name, @_) };
}
return $self;
}
sub _build_relationships {
my $self = shift;
my ($relationships) = @_;
$self->{relationships} ||= {};
foreach my $rel (keys %{$relationships}) {
$self->{relationships}->{$rel} =
ObjectDB::Meta::RelationshipFactory->new->build(
$relationships->{$rel}->{type}, %{$relationships->{$rel}},
orig_class => $self->{class},
name => $rel
);
}
}
sub _is_inheriting {
my $class = shift;
my ($for_class) = @_;
my $parents = mro::get_linear_isa($for_class);
foreach my $parent (@$parents) {
if (my $parent_meta = $OBJECTS{$parent}) {
my $meta = Storable::dclone($parent_meta);
$meta->{class} = $for_class;
return $meta;
}
}
return;
}
1;
__END__
=pod
=head1 NAME
ObjectDB::Meta - meta object
=head1 SYNOPSIS
ObjectDB::Meta->new(
table => 'book',
columns => [qw/id author_id title/],
primary_key => 'id',
auto_increment => 'id',
relationships => {
author => {
type = 'many to one',
class => 'MyAuthor',
map => {author_id => 'id'}
}
}
);
=head1 DESCRIPTION
Meta object is used internally for describing the table schema.
=head2 Inheritance
The key feature is inheritance. You can inherit schema, add or remove columns,
specify new relationships and so on.
package Parent;
use base 'MyDB';
__PACKAGE__->schema(
table => 'parent',
columns => [qw/id title/],
primary_key => 'id'
);
package Child;
use base 'Parent';
__PACKAGE__->schema->add_column('description');
=head2 Schema
=over
=item C<table>
Table name.
=item C<columns>
Column names.
=item C<primary_key>
Primary key.
=item C<auto_increment>
Auto increment field. This field is updated as soon as object is created.
=item C<unique_keys>
Unique keys.
=item C<relationships>
Relationships.
=back
=cut