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lib/Alvis/Wikipedia/CatGraph.pm  view on Meta::CPAN

{
    my $self=shift;
    my $errcode=shift;
    my $errmsg=shift;

    if (!defined($errcode))
    {
	confess("set_err_state() called with an undefined argument.");
    }

    if (exists($ErrMsgs{$errcode}))
    {
	if ($errcode==$ERR_OK)
	{
	    $self->{errstr}="";
	}
	else
	{
	    $self->{errstr}.=" " . $ErrMsgs{$errcode};
	    if (defined($errmsg))
	    {
		$self->{errstr}.=" " . $errmsg;
	    }

	}
    }
    else
    {
	confess("Internal error: set_err_state() called with an " .
		"unrecognized argument ($errcode).")
    }
}

sub clearerr
{
    my $self=shift;
    
    $self->{errstr}="";
}

sub errmsg
{
    my $self=shift;
    
    return $self->{errstr};
}

#############################################################################
#
#      Public methods
#
##############################################################################
 
sub new
{
    my $proto=shift;

    my $class=ref($proto)||$proto;
    my $parent=ref($proto)&&$proto;
    my $self={};
    bless($self,$class);


    $self->_init(@_);

    $self->_set_err_state($ERR_OK);

    return $self;
}

sub _init
{
    my $self=shift;

    $self->{root}=$DEF_ROOT;
    $self->{method}=$DEF_METHOD;

    if (defined(@_))
    {
        my %args=@_;
        @$self{ keys %args }=values(%args);
    }
}

sub dump_graph
{
    my $self=shift;
    my $f=shift;

    eval
    {
	store($self->{G},$f);
    };
    if ($@)
    {
	$self->_set_err_state($ERR_DUMP,"file: $f");
	return 0;
    }

    return 1;
}

sub load_graph
{
    my $self=shift;
    my $f=shift;

    eval
    {
	$self->{G}=retrieve($f);
    };
    if ($@)
    {
	$self->_set_err_state($ERR_LOAD,"file: $f");
	return 0;
    }
    if (!defined($self->{G}))
    {
	$self->_set_err_state($ERR_LOAD_UNDEF,"file: $f");
	return 0;
    }