Business::DK::PO - danish postal order code generator/validator

This documentation describes version 0.05

    use Business::DK::PO qw(validate);

    my $rv;
    eval {
        $rv = validate(1234563891234562);
    };

    if ($@) {
        die "Code is not of the expected format - $@";
    }

    if ($rv) {
        print "Code is valid";
    } else {
        print "Code is not valid";
    }




    use Business::DK::PO qw(calculate);

    my $code = calculate(1234);




    #Using with Params::Validate

    use Params::Validate qw(:all);
    use Business::DK::PO qw(validatePO);

    sub check_cpr {
        validate( @_,
        { po =>
            { callbacks =>
                { 'validate_po' => sub { validatePO($_[0]); } } } } );

        print $_[1]." is a valid PO\n";

    }

The postal orders and postal order codes are used by the danish postal service PostDanmark.

The function takes a single argument, a 16 digit postal order code.

The function returns 1 (true) in case of a valid postal order code argument and 0 (false) in case of an invalid postal order code argument.

The validation function goes through the following steps.

Validation of the argument is done using the functions (all described below in detail):

* _argument

* _content

* _length

If the argument is a valid argument the sum is calculated by _calculate_sum based on the argument and the controlcifers array.

The sum returned is checked using a modulus caluculation and based on its validity either 1 or 0 is returned.

A wrapper for validate with a name more suitable for importing, it is less common and therefor less intrusive.

See validate for details.

The function takes a single argument, an integer indicating a unique reference number you can use to identify an order. Suggestions are invoice number, order number or similar.

The number provided must be between 1 and 15 digits long, meaning a number between 1 and 999 trillions.

The function returns a postal order code consisting of the number given as argument appended with a control cifer to make the code valid (See: b<validate>

The calculation function goes through the following steps.

Validation of the argument is done using the functions (all described below in detail):

* _argument

* _content

* _length

If the argument is a valid argument the sum is calculated by _calculate_sum based on the argument and the controlcifers array.

Based on the sum the argument the controlcifer is calculated and appended so that the argument becomes a valid postal order code.

The calculated and valid code is then returned, left-padded with zeroes to make it 16 digits long (SEE: validate).

This function is called from either validate or calculate if an argument is not provided.

It dies with an error message indicating the exceptional situation and attempts to guide the user to providing a sensible input.

The _argument function takes two arguments:

* minimum length required of number (mandatory)

* maximum length required of number (optional)

The arguments are used in the error message issued with die, since this method always dies.

This function validates the content of the argument, it croaks if the argument is not an integer (consisting of digits only).

This function validates the length of the argument, it dies if the argument does not fit wihtin the boundaries specified by the arguments provided:

The _length function takes the following arguments:

* number (mandatory), the number to be validated

* minimum length required of number (mandatory)

* maximum length required of number (optional)

This function takes an integer and calculates the sum bases on the the controlcifer array.

Business::DK::PO exports on request:

* validate

* validatePO

* calculate

* _argument

* _content

* _length

* _calculate_sum

Coverage of the test suite is at 100%

    ---------------------------- ------ ------ ------ ------ ------ ------ ------
    File                           stmt   bran   cond    sub    pod   time  total
    ---------------------------- ------ ------ ------ ------ ------ ------ ------
    blib/lib/Business/DK/PO.pm    100.0  100.0    n/a  100.0  100.0  100.0  100.0
    Total                         100.0  100.0    n/a  100.0  100.0  100.0  100.0
    ---------------------------- ------ ------ ------ ------ ------ ------ ------

Test::Kwalitee passes

Test::Perl::Critic passes at severity 1, brutal, with many policies disabled though, see /perlcriticrc.

Please report issues via CPAN RT:

  http://rt.cpan.org/NoAuth/Bugs.html?Dist=Business-DK-PO

or by sending mail to

  bug-Business-DK-PO@rt.cpan.org

http://www.bgbank.dk/bfBlankethaandbog

bin/calculate_po.pl

bin/validate_po.pl

Jonas B. Nielsen, (jonasbn) - <jonasbn@cpan.org>

Business-DK-PO is (C) by Jonas B. Nielsen, (jonasbn) 2006-2010

Business-DK-PO is released under the artistic license

The distribution is licensed under the Artistic License, as specified by the Artistic file in the standard perl distribution (http://www.perl.com/language/misc/Artistic.html).