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lib/Abstract/Meta/Attribute/Method.pm  view on Meta::CPAN

package Abstract::Meta::Attribute::Method;


use strict;
use warnings;
use Carp 'confess';
use vars qw($VERSION);

$VERSION = 0.06;


=head1 NAME

Abstract::Meta::Attribute::Method - Method generator.

=head1 DESCRIPTION

Generates methods for attribute's definition.

=head1 SYNOPSIS

    use Abstract::Meta::Class ':all';
    has '$.attr1' => (default => 0); 

=head2 methods

=over

=item generate_scalar_accessor_method

=cut

sub generate_scalar_accessor_method {
    my $attr = shift; 
    my $mutator = $attr->mutator;
    my $storage_key = $attr->storage_key;
    my $transistent = $attr->transistent;    
    my $on_read = $attr->on_read;
    my $array_storage_type = $attr->storage_type eq 'Array';
    $array_storage_type ? 
        ($transistent ? sub {
            my ($self, @args) = @_;
            $self->$mutator(@args) if scalar(@args) >= 1;
            my $result = $on_read
            ? $on_read ->($self, $attr, 'accessor')
            : get_attribute($self, $storage_key);
            $result;
        }
        : (
           $on_read ?
           sub {
            my ($self, @args) = @_;
            $self->$mutator(@args) if scalar(@args) >= 1;
            my $result = $on_read
            ? $on_read ->($self, $attr, 'accessor')
            : $self->[$storage_key];
            $result;
            } :
            sub {
                my ($self, @args) = @_;
                $self->$mutator(@args) if @args >= 1;
                $self->[$storage_key];
            }
           )
        )
    :
    sub {
        my ($self, @args) = @_;
        $self->$mutator(@args) if scalar(@args) >= 1;
        my $result = $on_read
        ? $on_read ->($self, $attr, 'accessor')
        : $transistent ? get_attribute($self, $storage_key) : $self->{$storage_key};
        $result;
    };
}


=item generate_code_accessor_method

=cut

sub generate_code_accessor_method {
    my $attr = shift;
    $attr->generate_scalar_accessor_method;
}


=item generate_mutator_method

=cut

sub generate_mutator_method {
    my $attr = shift;
    my $storage_key = $attr->storage_key;
    my $transistent = $attr->transistent;    
    my $accessor = $attr->accessor;
    my $required = $attr->required;
    my $default = $attr->default;
    my $associated_class = $attr->associated_class;
    my $perl_type = $attr->perl_type;
    my $index_by = $attr->index_by;
    my $on_change = $attr->on_change;
    my $data_type_validation = $attr->data_type_validation;
    my $on_validate = $attr->on_validate;
    my $array_storage_type = $attr->storage_type eq 'Array';
    $array_storage_type ?
    sub {
        my ($self, $value) = @_;
        if (! defined $value && defined $default) {
            if (ref($default) eq 'CODE') {
                $value = $default->($self, $attr);
            } else {
                $value = $default;
            }
        }

        $on_validate->($self, $attr, 'mutator', \$value) if $on_validate;
        if ($data_type_validation) {
            $value = index_association_data($value, $accessor, $index_by)
                if ($associated_class && $perl_type eq 'Hash');
            $attr->validate_data_type($self, $value, $accessor, $associated_class, $perl_type);
            if($required) {
                if ($perl_type eq 'Hash') {
                    confess "attribute $accessor is required"
                      unless scalar %$value;
                      
                } elsif ($perl_type eq 'Array') {
                    confess "attribute $accessor is required"
                      unless scalar @$value;
                }
            }

        } else {
        confess "attribute $accessor is required"
          if $required && ! defined $value;
        }
        
        $on_change->($self, $attr, 'mutator', \$value) or return $self
          if ($on_change && defined $value);
        

        if ($transistent) {
            set_attribute($self, $storage_key, $value);
        } else {
            $self->[$storage_key] = $value;
        }
        $self;
    }    
    :
    sub {
        my ($self, $value) = @_;
        if (! defined $value && defined $default) {
            if (ref($default) eq 'CODE') {
                $value = $default->($self, $attr);
            } else {
                $value = $default;
            }
        }

        $on_validate->($self, $attr, 'mutator', \$value) if $on_validate;
        if ($data_type_validation) {
            $value = index_association_data($value, $accessor, $index_by)
                if ($associated_class && $perl_type eq 'Hash');
            $attr->validate_data_type($self, $value, $accessor, $associated_class, $perl_type);
            if($required) {
                if ($perl_type eq 'Hash') {
                    confess "attribute $accessor is required"
                      unless scalar %$value;
                      
                } elsif ($perl_type eq 'Array') {
                    confess "attribute $accessor is required"
                      unless scalar @$value;
                }
            }
        } else {
            confess "attribute $accessor is required"
              if $required && ! defined $value;
        }

        
        $on_change->($self, $attr, 'mutator', \$value) or return $self
          if ($on_change && defined $value);
        

        if ($transistent) {
            set_attribute($self, $storage_key, $value);
        } else {
            $self->{$storage_key} = $value;
        }
        $self;
    };
}


=item index_association_data

=cut

sub index_association_data {
    my ($data, $attr_name, $index) = @_;
    return $data if ref($data) eq 'HASH';
    my %result;
    if($index && $$data[0]->can($index)) {
        %result = (map {($_->$index, $_)} @$data);
    } else {
        %result = (map {($_  . "", $_)} @$data);
    }
    \%result;
}


=item validate_data_type

=cut

sub validate_data_type {