1 files changed, 103 insertions, 0 deletions
diff --git a/lib/URI/urn/isbn.pm b/lib/URI/urn/isbn.pm
new file mode 100644
index 0000000..b335044
--- /dev/null
+++ b/lib/URI/urn/isbn.pm
@@ -0,0 +1,103 @@
+package URI::urn::isbn;  # RFC 3187
+
+use strict;
+use warnings;
+
+use parent 'URI::urn';
+
+use Carp qw(carp);
+
+BEGIN {
+    require Business::ISBN;
+    
+    local $^W = 0; # don't warn about dev versions, perl5.004 style
+    warn "Using Business::ISBN version " . Business::ISBN->VERSION . 
+        " which is deprecated.\nUpgrade to Business::ISBN version 2\n"
+        if Business::ISBN->VERSION < 2;
+    }
+    
+sub _isbn {
+    my $nss = shift;
+    $nss = $nss->nss if ref($nss);
+    my $isbn = Business::ISBN->new($nss);
+    $isbn = undef if $isbn && !$isbn->is_valid;
+    return $isbn;
+}
+
+sub _nss_isbn {
+    my $self = shift;
+    my $nss = $self->nss(@_);
+    my $isbn = _isbn($nss);
+    $isbn = $isbn->as_string if $isbn;
+    return($nss, $isbn);
+}
+
+sub isbn {
+    my $self = shift;
+    my $isbn;
+    (undef, $isbn) = $self->_nss_isbn(@_);
+    return $isbn;
+}
+
+sub isbn_publisher_code {
+    my $isbn = shift->_isbn || return undef;
+    return $isbn->publisher_code;
+}
+
+BEGIN {
+my $group_method = do {
+    local $^W = 0; # don't warn about dev versions, perl5.004 style
+    Business::ISBN->VERSION >= 2 ? 'group_code' : 'country_code';
+    };
+
+sub isbn_group_code {
+    my $isbn = shift->_isbn || return undef;
+    return $isbn->$group_method;
+}
+}
+
+sub isbn_country_code {
+    my $name = (caller(0))[3]; $name =~ s/.*:://;
+    carp "$name is DEPRECATED. Use isbn_group_code instead";
+    
+    no strict 'refs';
+    &isbn_group_code;
+}
+
+BEGIN {
+my $isbn13_method = do {
+    local $^W = 0; # don't warn about dev versions, perl5.004 style
+    Business::ISBN->VERSION >= 2 ? 'as_isbn13' : 'as_ean';
+    };
+
+sub isbn13 {
+    my $isbn = shift->_isbn || return undef;
+    
+    # Business::ISBN 1.x didn't put hyphens in the EAN, and it was just a string
+    # Business::ISBN 2.0 doesn't do EAN, but it does ISBN-13 objects
+    #   and it uses the hyphens, so call as_string with an empty anon array
+    # or, adjust the test and features to say that it comes out with hyphens.
+    my $thingy = $isbn->$isbn13_method;
+    return eval { $thingy->can( 'as_string' ) } ? $thingy->as_string([]) : $thingy;
+}
+}
+
+sub isbn_as_ean {
+    my $name = (caller(0))[3]; $name =~ s/.*:://;
+    carp "$name is DEPRECATED. Use isbn13 instead";
+
+    no strict 'refs';
+    &isbn13;
+}
+
+sub canonical {
+    my $self = shift;
+    my($nss, $isbn) = $self->_nss_isbn;
+    my $new = $self->SUPER::canonical;
+    return $new unless $nss && $isbn && $nss ne $isbn;
+    $new = $new->clone if $new == $self;
+    $new->nss($isbn);
+    return $new;
+}
+
+1;