view release on metacpan or  search on metacpan

lib/AI/ExpertSystem/Simple/Rule.pm  view on Meta::CPAN

package AI::ExpertSystem::Simple::Rule;

use strict;
use warnings;

our $VERSION = '1.2';

sub new {
	my ($class, $name) = @_;

	die "Rule->new() takes 1 argument" if(scalar(@_) != 2);
	die "Rule->new() argument 1 (NAME) is undefined" if(!defined($name));

	my $self = {};

	$self->{_name} = $name;
	$self->{_conditions} = ();
	$self->{_tested} = ();
	$self->{_counter} = 0;
	$self->{_actions} = ();
	$self->{_state} = 'active';

	return bless $self, $class;
}

sub reset {
	my ($self) = @_;

	# Check the input

	die "Rule->reset() takes no arguments" if scalar(@_) != 1;

	$self->{_state} = 'active';
	$self->{_counter} = 0;

	foreach my $name (keys %{$self->{_tested}}) {
		$self->{_tested}->{$name} = 0;
		$self->{_counter}++;
	}
}

sub add_condition {
	my ($self, $name, $value) = @_;

	die "Rule->add_condition() takes 2 arguments" if(scalar(@_) != 3);
	die "Rule->add_condition() argument 1 (NAME) is undefined" if(!defined($name));
	die "Rule->add_condition() argument 2 (VALUE) is undefined" if(!defined($value));

	if(defined($self->{_conditions}->{$name})) {
		die "Rule->add_condition() has already been set";
	}

	$self->{_conditions}->{$name} = $value;
	$self->{_tested}->{$name} = 0;
	$self->{_counter}++;
}

sub add_action {
	my ($self, $name, $value) = @_;

	die "Rule->add_action() takes 2 arguments" if(scalar(@_) != 3);
	die "Rule->add_action() argument 1 (NAME) is undefined" if(!defined($name));
	die "Rule->add_action() argument 2 (VALUE) is undefined" if(!defined($value));

	if(defined($self->{_actions}->{$name})) {
		die "Rule->add_action() has already been set";
	}

	$self->{_actions}->{$name} = $value;
}

sub name {
	my ($self) = @_;

	die "Rule->name() takes no arguments" if(scalar(@_) != 1);

	return $self->{_name};
}

sub state {
	my ($self) = @_;

	die "Rule->state() takes no arguments" if(scalar(@_) != 1);