Provided by: libbusiness-ismn-perl_1.11-1_all 
NAME
Business::ISMN - work with International Standard Music Numbers
SYNOPSIS
use Business::ISMN;
$ismn_object = new Business::ISMN('M021765430');
$ismn_object = new Business::ISMN('M-021-76543-0');
#print the ISMN with hyphens at positions specified
#by constructor
print $ismn_object->as_string;
#print the ISMN with hyphens at specified positions.
#this not does affect the default positions
print $ismn_object->as_string([]);
#print the publisher or publisher code
print $ismn->publisher;
print $ismn->publisher_code;
#check to see if the ISMN is valid
$ismn_object->is_valid;
#fix the ISMN checksum. BEWARE: the error might not be
#in the checksum!
$ismn_object->fix_checksum;
# create an EAN13 barcode in PNG format
$ismn_object->png_barcode;
#EXPORTABLE FUNCTIONS
use Business::ISMN qw( is_valid_checksum
ismn_to_ean ean_to_ismn );
#verify the checksum
if( is_valid_checksum('0123456789')
eq Business::ISMN::GOOD_ISMN )
{ ... }
#convert to EAN (European Article Number)
$ean = ismn_to_ean('1565921496');
#convert from EAN (European Article Number)
$ismn = ean_to_ismn('9781565921498');
DESCRIPTION
Methods
new($ismn)
The constructor accepts a scalar representing the ISMN.
The string representing the ISMN may contain characters other than "[0-9mM]", although these will be
removed in the internal representation. The resulting string must look like an ISMN - the first
character is an 'M' and the following nine characters must be digits.
The constructor attempts to determine the country code and the publisher code. If these data cannot
be determined, the constructor sets "$obj->is_valid" to something other than "GOOD_ISMN". An object
is still returned and it is up to the program to check "$obj->is_valid" for one of five values (which
may be exported on demand). The actual values of these symbolic versions are the same as those from
previous versions of this module which used literal values.
Business::ISMN::INVALID_PUBLISHER_CODE
Business::ISMN::BAD_CHECKSUM
Business::ISMN::GOOD_ISMN
Business::ISMN::BAD_ISMN
The string passed as the ISMN need not be a valid ISMN as long as it superficially looks like one.
This allows one to use the "fix_checksum()" method. Despite the disclaimer in the discussion of that
method, the author has found it extremely useful. One should check the validity of the ISMN with
"is_valid()" rather than relying on the return value of the constructor. If all one wants to do is
check the validity of an ISMN, one can skip the object-oriented interface and use the
"is_valid_checksum()" function which is exportable on demand.
If the constructor decides it cannot create an object, it returns "undef". It may do this if the
string passed as the ISMN cannot be munged to the internal format meaning that it does not even come
close to looking like an ISMN.
ismn
Returns the ISMN as a string
publisher
Returns the country associated with the publisher code.
publisher_code
Returns the publisher code or "undef" if no publisher code was found.
article_code
Returns the article code or "undef" if no article code was found.
checksum
Returns the checksum or "undef" if no publisher code was found.
hyphen_positions
Returns the list of hyphen positions as determined from the country and publisher codes. the
"as_string" method provides a way to temporarily override these positions and to even forego them
altogether.
as_string(), as_string([])
Return the ISMN as a string. This function takes an optional anonymous array (or array reference)
that specifies the placement of hyphens in the string. An empty anonymous array produces a string
with no hyphens. An empty argument list automatically hyphenates the ISMN based on the discovered
publisher code. An ISMN that is not valid may produce strange results.
The positions specified in the passed anonymous array are only used for one method use and do not
replace the values specified by the constructor. The method assumes that you know what you are doing
and will attempt to use the least three positions specified. If you pass an anonymous array of
several positions, the list will be sorted and the lowest three positions will be used. Positions
less than 1 and greater than 9 are silently ignored.
is_valid
Returns "Business::ISMN::GOOD_ISMN" if the checksum is valid and the country and publisher codes are
defined.
Returns "Business::ISMN::BAD_CHECKSUM" if the ISMN does not pass the checksum test. The constructor
accepts invalid ISMN's so that they might be fixed with "fix_checksum".
Returns "Business::ISMN::INVALID_PUBLISHER_CODE" if a publisher code could not be determined.
Returns "Business::ISMN::BAD_ISMN" if the string has no hope of ever looking like a valid ISMN. This
might include strings such as "abc", "123456", and so on.
is_valid_publisher_code
Returns true if the publisher code is valid, and false otherwise.
fix_checksum()
Replace the tenth character with the checksum the corresponds to the previous nine digits. This does
not guarantee that the ISMN corresponds to the product one thinks it does, or that the ISMN
corresponds to any product at all. It only produces a string that passes the checksum routine. If
the ISMN passed to the constructor was invalid, the error might have been in any of the other nine
positions.
$obj->as_ean()
Converts the ISMN to the equivalent EAN (European Article Number). No pricing extension is added.
Returns the EAN as a string. This method can also be used as an exportable function since it checks
its argument list to determine what to do.
png_barcode()
Creates a PNG image of the EAN13 barcode which corresponds to the ISMN. Returns the image as a
string.
EXPORTABLE FUNCTIONS
Some functions can be used without the object interface. These do not use object technology behind the
scenes.
is_valid_checksum('M021765430')
Takes the ISMN string and runs it through the checksum comparison routine. Returns
"Business::ISMN::GOOD_ISMN" if the ISMN is valid, "Business::ISMN::BAD_CHECKSUM" if the string looks
like an ISMN but has an invalid checksum, and "Business::ISMN::BAD_ISMN" if the string does not look
like an ISMN.
ismn_to_ean('M021765430')
Takes the ISMN string and converts it to the equivalent EAN string. This function checks for a valid
ISMN and will return undef for invalid ISMNs, otherwise it returns the EAN as a string. Uses as_ean
internally, which checks its arguments to determine what to do.
ean_to_ismn('9790021765439')
Takes the EAN string and converts it to the equivalent ISMN string. This function checks for a valid
ISMN and will return undef for invalid ISMNs, otherwise it returns the EAN as a string. Uses as_ean
internally, which checks its arguments to determine what to do.
TO DO
* i need more ISMN numbers for tests
SOURCE AVAILABILITY
This source is part of a SourceForge project which always has the latest sources in CVS, as well as all
of the previous releases.
http://sourceforge.net/projects/brian-d-foy/
If, for some reason, I disappear from the world, one of the other members of the project can shepherd
this module appropriately.
AUTHOR
brian d foy, "<bdfoy@cpan.org>"
COPYRIGHT AND LICENSE
Copyright (c) 2001-2007, brian d foy, All Rights Reserved.
You may redistribute this under the same terms as Perl itself.
perl v5.14.2 2007-10-26 ISMN(3pm)