ISBN(3pm)						User Contributed Perl Documentation						 ISBN(3pm)

NAME

       Business::ISBN - work with International Standard Book Numbers

SYNOPSIS

	       use Business::ISBN;

	       # 10 digit ISBNs
	       $isbn10 = Business::ISBN->new('1565922573');
	       $isbn10 = Business::ISBN->new('1-56592-257-3');

	       # 13 digit ISBNs
	       $isbn13 = Business::ISBN->new('978-0-596-52724-2');

	       # convert
	       $isbn10 = $isbn13->as_isbn10;	# for the 978 prefixes

	       $isbn13 = $isbn10->as_isbn13;

	       # maybe you don't care what it is as long as everything works
	       $isbn = Business::ISBN->new( $ARGV[0] );

	       #print the ISBN with hyphens at usual positions
	       print $isbn->as_string;

	       #print the ISBN with hyphens at specified positions.
	       #this not does affect the default positions
	       print $isbn->as_string([]);

	       #print the group code or publisher code
	       print $isbn->group_code;

	       print $isbn->publisher_code;

	       #check to see if the ISBN is valid
	       $isbn->is_valid;

	       #fix the ISBN checksum.	BEWARE:  the error might not be
	       #in the checksum!
	       $isbn->fix_checksum;

	       # create an EAN13 barcode in PNG format
	       $isbn->png_barcode;

DESCRIPTION

       This modules handles International Standard Book Numbers, including ISBN-10 and ISBN-13.

   Function interface
       valid_isbn_checksum( ISBN10 | ISBN13 )
	   This function is exportable on demand, and works for either 10 or 13 character ISBNs).

		   use Business::ISBN qw( valid_isbn_checksum );

	   Returns 1 if the ISBN is a valid ISBN with the right checksum.

	   Returns 0 if the ISBN has valid prefix and publisher codes, but an invalid checksum.

	   Returns undef if the ISBN does not validate for any other reason.

   Object interface
       new($isbn)
	   The constructor accepts a scalar representing the ISBN.

	   The string representing the ISBN may contain characters other than "[0-9xX]", although these will be removed in the internal
	   representation.  The resulting string must look like an ISBN - the first nine characters must be digits and the tenth character must be
	   a digit, 'x', or 'X'.

	   The constructor attempts to determine the group code and the publisher code.  If these data cannot be determined, the constructor sets
	   "$obj->is_valid" to something other than "GOOD_ISBN".  An object is still returned and it is up to the program to check
	   "$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::ISBN::INVALID_PUBLISHER_CODE
		   Business::ISBN::INVALID_GROUP_CODE
		   Business::ISBN::BAD_CHECKSUM
		   Business::ISBN::GOOD_ISBN
		   Business::ISBN::BAD_ISBN

	   If you have one of these values and want to turn it into a string, you can use the %Business::ISBN::ERROR_TEXT hash, which is
	   exportable by asking for it explicitly in the import list.

		   use Business::ISBN qw(%ERROR_TEXT);

	   The string passed as the ISBN need not be a valid ISBN 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 ISBN 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 ISBN, one can skip the object-oriented interface and use the "valid_isbn_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 ISBN cannot be
	   munged to the internal format meaning that it does not even come close to looking like an ISBN.

   Instance methods
       input_isbn
	   Returns the starting ISBN. Since you may insert hyphens or fix checksums, you might want to see the original data.

       common_data
	   Returns the starting ISBN after normalization, which removes anything that isn't a digit or a valid checksum character.

       isbn
	   Returns the current value of ISBN, even if it has an invalid checksum.  This is the raw data so it doesn't have the hyphens. If you
	   want hyphenation, try "as_string".

	   The "isbn" method should be the same as "as_string( [] )".

       error
	   Return the error code for the reason the ISBN isn't valid. The return value is a key in %ERROR_TEXT.

       is_valid
	   Return true if the ISBN is valid, meaning that it has a valid prefix (for ISBN-13), group code, and publisher code; and its checksum
	   validates.

       type
	   Returns either "ISBN10" or "ISBN13".

       prefix
	   Returns the prefix for the ISBN. This is currently either 978 or 979 for ISBN-13. It returns the empty string (so, a defined value) for
	   ISBN-10.

       group_code
	   Returns the group code for the ISBN. This is the numerical version, for example, '0' for the English group. The valid group codes come
	   from "Business::ISBN::Data".

       group
	   Returns the group name for the ISBN. This is the string version. For instance, 'English' for the '0' group. The names come from
	   "Business::ISBN::Data".

       publisher_code
	   Returns the publisher code for the ISBN. This is the numeric version, for instance '596' for O'Reilly Media.

       article_code
	   Returns the article code for the ISBN. This is the numeric version that uniquely identifies the item.

       checksum
	   Returns the checksum code for the ISBN. This checksum may not be valid since you can create an object an fix the checksum later with
	   "fix_checksum".

       is_valid_checksum
	   Returns "Business::ISBN::GOOD_ISBN" for valid checksums and "Business::ISBN::BAD_CHECKSUM" otherwise. This does not guarantee that the
	   rest of the ISBN is actually assigned to a book.

       fix_checksum
	   Checks the checksum and modifies the ISBN to set it correctly if needed.

       as_string(),  as_string([])
	   Return the ISBN 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
	   ISBN based on the discovered group and publisher codes.  An ISBN 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 12 are silently ignored.

	   A terminating 'x' is changed to 'X'.

       as_isbn10
	   Returns a new ISBN object. If the object is already ISBN-10, this method clones it. If it is an ISBN-13 with the prefix 978, it returns
	   the ISBN-10 equivalent. For all other cases it returns undef.

       as_isbn13
	   Returns a new ISBN object. If the object is already ISBN-13, this method clones it. If it is an ISBN-10, it returns the ISBN-13
	   equivalent with the 978 prefix.

       xisbn
	   In scalar context, returns an anonymous array of related ISBNs using xISBN.	In list context, returns a list.

	   This feature requires "LWP::Simple".

       png_barcode
	   Returns image data in PNG format for the barcode for the ISBN. This works with ISBN-10 and ISBN-13. The ISBN-10s are automaically
	   converted to ISBN-13.

	   This requires "GD::Barcode::EAN13".

BUGS

       *

TO DO

       * i would like to create the bar codes with the price extension

SOURCE AVAILABILITY

       This source is in Github:

	   http://github.com/briandfoy/business--isbn/tree/master

AUTHOR

       brian d foy "<bdfoy@cpan.org>"

COPYRIGHT AND LICENSE

       Copyright (c) 2001-2009, brian d foy, All Rights Reserved.

       You may redistribute this under the same terms as Perl itself.

CREDITS

       Thanks to Mark W. Eichin "<eichin@thok.org>" for suggestions and discussions on EAN support.

       Thanks to Andy Lester "<andy@petdance.com>" for lots of bug fixes and testing.

       Ed Summers "<esummers@cpan.org>" has volunteered to help with this module.

perl v5.10.0							    2009-01-25								 ISBN(3pm)