/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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trunk/IsisDB.pm revision 32 by dpavlin, Wed Jan 5 15:46:26 2005 UTC trunk/lib/Biblio/Isis.pm revision 70 by dpavlin, Fri May 18 20:26:01 2007 UTC
# Line 1  Line 1 
1  package IsisDB;  package Biblio::Isis;
2  use strict;  use strict;
3    
4  use Carp;  use Carp;
5  use File::Glob qw(:globally :nocase);  use File::Glob qw(:globally :nocase);
6    
 use Data::Dumper;  
   
7  BEGIN {  BEGIN {
8          use Exporter ();          use Exporter ();
9          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
10          $VERSION     = 0.09;          $VERSION     = 0.24_1;
11          @ISA         = qw (Exporter);          @ISA         = qw (Exporter);
12          #Give a hoot don't pollute, do not export more than needed by default          #Give a hoot don't pollute, do not export more than needed by default
13          @EXPORT      = qw ();          @EXPORT      = qw ();
# Line 20  BEGIN { Line 18  BEGIN {
18    
19  =head1 NAME  =head1 NAME
20    
21  IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database  Biblio::Isis - Read CDS/ISIS, WinISIS and IsisMarc database
22    
23  =head1 SYNOPSIS  =head1 SYNOPSIS
24    
25    use IsisDB;    use Biblio::Isis;
26    
27    my $isis = new IsisDB(    my $isis = new Biblio::Isis(
28          isisdb => './cds/cds',          isisdb => './cds/cds',
29    );    );
30    
# Line 81  rarely an issue). Line 79  rarely an issue).
79    
80  Open ISIS database  Open ISIS database
81    
82   my $isis = new IsisDB(   my $isis = new Biblio::Isis(
83          isisdb => './cds/cds',          isisdb => './cds/cds',
84          read_fdt => 1,          read_fdt => 1,
85          include_deleted => 1,          include_deleted => 1,
86          hash_filter => sub {          hash_filter => sub {
87                  my $v = shift;                  my ($v,$field_number) = @_;
88                  $v =~ s#foo#bar#g;                  $v =~ s#foo#bar#g;
89          },          },
90          debug => 1,          debug => 1,
91            join_subfields_with => ' ; ',
92   );   );
93    
94  Options are described below:  Options are described below:
# Line 115  Don't skip logically deleted records in Line 114  Don't skip logically deleted records in
114    
115  =item hash_filter  =item hash_filter
116    
117  Filter code ref which will be used before data is converted to hash.  Filter code ref which will be used before data is converted to hash. It will
118    receive two arguments, whole line from current field (in C<< $_[0] >>) and
119    field number (in C<< $_[1] >>).
120    
121  =item debug  =item debug
122    
123  Dump a B<lot> of debugging output.  Dump a B<lot> of debugging output even at level 1. For even more increase level.
124    
125    =item join_subfields_with
126    
127    Define delimiter which will be used to join repeatable subfields. This
128    option is included to support lagacy application written against version
129    older than 0.21 of this module. By default, it disabled. See L</to_hash>.
130    
131    =item ignore_empty_subfields
132    
133    Remove all empty subfields while reading from ISIS file.
134    
135  =back  =back
136    
# Line 132  sub new { Line 143  sub new {
143    
144          croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb});          croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb});
145    
146          foreach my $v (qw{isisdb debug include_deleted hash_filter}) {          foreach my $v (qw{isisdb debug include_deleted hash_filter join_subfields_with ignore_empty_subfields}) {
147                  $self->{$v} = {@_}->{$v};                  $self->{$v} = {@_}->{$v} if defined({@_}->{$v});
148          }          }
149    
150          my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*"));          my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*"));
# Line 147  sub new { Line 158  sub new {
158          push @must_exist, "fdt" if ($self->{read_fdt});          push @must_exist, "fdt" if ($self->{read_fdt});
159    
160          foreach my $ext (@must_exist) {          foreach my $ext (@must_exist) {
161                  croak "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});                  unless ($self->{$ext."_file"}) {
162                            carp "missing ",uc($ext)," file in ",$self->{isisdb};
163                            return;
164                    }
165          }          }
166    
167          print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});          if ($self->{debug}) {
168                    print STDERR "## using files: ",join(" ",@isis_files),"\n";
169                    eval "use Data::Dump";
170    
171                    if (! $@) {
172                            *Dumper = *Data::Dump::dump;
173                    } else {
174                            use Data::Dumper;
175                    }
176            }
177    
178          # if you want to read .FDT file use read_fdt argument when creating class!          # if you want to read .FDT file use read_fdt argument when creating class!
179          if ($self->{read_fdt} && -e $self->{fdt_file}) {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
# Line 158  sub new { Line 181  sub new {
181                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
182                  my $fieldzone=0;                  my $fieldzone=0;
183    
184                  open(fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";                  open(my $fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";
185                    binmode($fileFDT);
186    
187                  while (<fileFDT>) {                  while (<$fileFDT>) {
188                          chomp;                          chomp;
189                          if ($fieldzone) {                          if ($fieldzone) {
190                                  my $name=substr($_,0,30);                                  my $name=substr($_,0,30);
# Line 177  sub new { Line 201  sub new {
201                          }                          }
202                  }                  }
203                                    
204                  close(fileFDT);                  close($fileFDT);
205          }          }
206    
207          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
208    
209          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";
210            binmode($self->{'fileMST'});
211    
212          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
213          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 190  sub new { Line 215  sub new {
215          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
216          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
217          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
218          seek($self->{'fileMST'},4,0);          seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
219    
220          my $buff;          my $buff;
221    
222          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
223          $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";          $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
   
224    
225            print STDERR "## self ",Dumper($self),"\n" if ($self->{debug});
   
         print STDERR Dumper($self),"\n" if ($self->{debug});  
226    
227          # open files for later          # open files for later
228          open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";          open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
229            binmode($self->{'fileXRF'});
230    
231          $self ? return $self : return undef;          $self ? return $self : return undef;
232  }  }
# Line 221  sub count { Line 244  sub count {
244          return $self->{'NXTMFN'} - 1;          return $self->{'NXTMFN'} - 1;
245  }  }
246    
 =head2 read_cnt  
   
 Read content of C<.CNT> file and return hash containing it.  
   
   print Dumper($isis->read_cnt);  
   
 This function is not used by module (C<.CNT> files are not required for this  
 module to work), but it can be useful to examine your index (while debugging  
 for example).  
   
 =cut  
   
 sub read_cnt  {  
         my $self = shift;  
   
         croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});  
   
         # Get the index information from $db.CNT  
     
         open(fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";  
   
         my $buff;  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         close(fileCNT);  
   
         return $self->{cnt};  
 }  
   
 =head2 unpack_cnt  
   
 Unpack one of two 26 bytes fixed length record in C<.CNT> file.  
   
 Here is definition of record:  
   
  off key        description                             size  
   0: IDTYPE     BTree type                              s  
   2: ORDN       Nodes Order                             s  
   4: ORDF       Leafs Order                             s  
   6: N          Number of Memory buffers for nodes      s  
   8: K          Number of buffers for first level index s  
  10: LIV        Current number of Index Levels          s  
  12: POSRX      Pointer to Root Record in N0x           l  
  16: NMAXPOS    Next Available position in N0x          l  
  20: FMAXPOS    Next available position in L0x          l  
  24: ABNORMAL   Formal BTree normality indicator        s  
  length: 26 bytes  
   
 This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.  
   
 =cut  
   
 sub unpack_cnt {  
         my $self = shift;  
   
         my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);  
   
         my $buff = shift || return;  
         my @arr = unpack("ssssssllls", $buff);  
   
         print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});  
   
         my $IDTYPE = shift @arr;  
         foreach (@flds) {  
                 $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);  
         }  
 }  
   
247  =head2 fetch  =head2 fetch
248    
249  Read record with selected MFN  Read record with selected MFN
# Line 334  sub fetch { Line 284  sub fetch {
284    
285          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
286          read($self->{'fileXRF'}, $buff, 4);          read($self->{'fileXRF'}, $buff, 4);
287          my $pointer=unpack("l",$buff) || carp "pointer is null";          my $pointer=unpack("V",$buff);
288            if (! $pointer) {
289                    if ($self->{include_deleted}) {
290                            return;
291                    } else {
292                            warn "pointer for MFN $mfn is null\n";
293                            return;
294                    }
295            }
296    
297          # check for logically deleted record          # check for logically deleted record
298          if ($pointer < 0) {          if ($pointer & 0x80000000) {
299                  print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});                  print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
300                  $self->{deleted} = $mfn;                  $self->{deleted} = $mfn;
301    
302                  return unless $self->{include_deleted};                  return unless $self->{include_deleted};
303    
304                  $pointer = abs($pointer);                  # abs
305                    $pointer = ($pointer ^ 0xffffffff) + 1;
306          }          }
307    
308          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
# Line 358  sub fetch { Line 317  sub fetch {
317    
318          # Get Record Information          # Get Record Information
319    
320          seek($self->{'fileMST'},$blk_off,0);          seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
321    
322          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
323          my $value=unpack("l",$buff);          my $value=unpack("V",$buff);
324    
325          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});
326    
# Line 378  sub fetch { Line 337  sub fetch {
337    
338          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
339    
340          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
341    
342          print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});          print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});
343    
# Line 398  sub fetch { Line 357  sub fetch {
357    
358          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
359    
360                  my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));                  my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
361    
362                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
363    
# Line 429  sub fetch { Line 388  sub fetch {
388                  # skip zero-sized fields                  # skip zero-sized fields
389                  next if ($FieldLEN[$i] == 0);                  next if ($FieldLEN[$i] == 0);
390    
391                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);                  my $v = substr($buff,$FieldPOS[$i],$FieldLEN[$i]);
392    
393                    if ( $self->{ignore_empty_subfields} ) {
394                            $v =~ s/(\^\w)+(\^\w)/$2/g;
395                            $v =~ s/\^\w$//;                        # last on line?
396                            next if ($v eq '');
397                    }
398    
399                    push @{$self->{record}->{$FieldTAG[$i]}}, $v;
400          }          }
401    
402          $self->{'current_mfn'} = $mfn;          $self->{'current_mfn'} = $mfn;
# Line 439  sub fetch { Line 406  sub fetch {
406          return $self->{'record'};          return $self->{'record'};
407  }  }
408    
409    =head2 mfn
410    
411    Returns current MFN position
412    
413      my $mfn = $isis->mfn;
414    
415    =cut
416    
417    # This function should be simple return $self->{current_mfn},
418    # but if new is called with _hack_mfn it becomes setter.
419    # It's useful in tests when setting $isis->{record} directly
420    
421    sub mfn {
422            my $self = shift;
423            return $self->{current_mfn};
424    };
425    
426    
427  =head2 to_ascii  =head2 to_ascii
428    
429  Returns ASCII output of record with specified MFN  Returns ASCII output of record with specified MFN
# Line 462  sub to_ascii { Line 447  sub to_ascii {
447    
448          my $mfn = shift || croak "need MFN";          my $mfn = shift || croak "need MFN";
449    
450          my $rec = $self->fetch($mfn);          my $rec = $self->fetch($mfn) || return;
451    
452          my $out = "0\t$mfn";          my $out = "0\t$mfn";
453    
# Line 518  which will be used for identifiers, C<i1 Line 503  which will be used for identifiers, C<i1
503               }               }
504             ],             ],
505    
506    In case there are repeatable subfields in record, this will create
507    following structure:
508    
509      '900' => [ {
510            'a' => [ 'foo', 'bar', 'baz' ],
511      }]
512    
513    Or in more complex example of
514    
515      902   ^aa1^aa2^aa3^bb1^aa4^bb2^cc1^aa5
516    
517    it will create
518    
519      902   => [
520            { a => ["a1", "a2", "a3", "a4", "a5"], b => ["b1", "b2"], c => "c1" },
521      ],
522    
523    This behaviour can be changed using C<join_subfields_with> option to L</new>,
524    in which case C<to_hash> will always create single value for each subfield.
525    This will change result to:
526    
527    
528    
529  This method will also create additional field C<000> with MFN.  This method will also create additional field C<000> with MFN.
530    
531    There is also more elaborative way to call C<to_hash> like this:
532    
533      my $hash = $isis->to_hash({
534            mfn => 42,
535            include_subfields => 1,
536      });
537    
538    Each option controll creation of hash:
539    
540    =over 4
541    
542    =item mfn
543    
544    Specify MFN number of record
545    
546    =item include_subfields
547    
548    This option will create additional key in hash called C<subfields> which will
549    have original record subfield order and index to that subfield like this:
550    
551      902   => [ {
552            a => ["a1", "a2", "a3", "a4", "a5"],
553            b => ["b1", "b2"],
554            c => "c1",
555            subfields => ["a", 0, "a", 1, "a", 2, "b", 0, "a", 3, "b", 1, "c", 0, "a", 4],
556      } ],
557    
558    =item join_subfields_with
559    
560    Define delimiter which will be used to join repeatable subfields. You can
561    specify option here instead in L</new> if you want to have per-record control.
562    
563    =item hash_filter
564    
565    You can override C<hash_filter> defined in L</new> using this option.
566    
567    =back
568    
569  =cut  =cut
570    
571  sub to_hash {  sub to_hash {
572          my $self = shift;          my $self = shift;
573    
574    
575          my $mfn = shift || confess "need mfn!";          my $mfn = shift || confess "need mfn!";
576            my $arg;
577    
578            my $hash_filter = $self->{hash_filter};
579    
580            if (ref($mfn) eq 'HASH') {
581                    $arg = $mfn;
582                    $mfn = $arg->{mfn} || confess "need mfn in arguments";
583                    $hash_filter = $arg->{hash_filter} if ($arg->{hash_filter});
584            }
585    
586          # init record to include MFN as field 000          # init record to include MFN as field 000
587          my $rec = { '000' => [ $mfn ] };          my $rec = { '000' => [ $mfn ] };
588    
589          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn) || return;
590    
591            my $j_rs = $arg->{join_subfields_with} || $self->{join_subfields_with};
592            $j_rs = $self->{join_subfields_with} unless(defined($j_rs));
593            my $i_sf = $arg->{include_subfields};
594    
595          foreach my $k (keys %{$row}) {          foreach my $f_nr (keys %{$row}) {
596                  foreach my $l (@{$row->{$k}}) {                  foreach my $l (@{$row->{$f_nr}}) {
597    
598                          # filter output                          # filter output
599                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          $l = $hash_filter->($l, $f_nr) if ($hash_filter);
600                            next unless defined($l);
601    
602                          my $val;                          my $val;
603                            my $r_sf;       # repeatable subfields in this record
604    
605                          # has identifiers?                          # has identifiers?
606                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
# Line 547  sub to_hash { Line 609  sub to_hash {
609                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
610                                  foreach my $t (split(/\^/,$l)) {                                  foreach my $t (split(/\^/,$l)) {
611                                          next if (! $t);                                          next if (! $t);
612                                          $val->{substr($t,0,1)} = substr($t,1);                                          my ($sf,$v) = (substr($t,0,1), substr($t,1));
613                                            # XXX this might be option, but why?
614                                            next unless (defined($v) && $v ne '');
615    #                                       warn "### $f_nr^$sf:$v",$/ if ($self->{debug} > 1);
616    
617                                            if (ref( $val->{$sf} ) eq 'ARRAY') {
618    
619                                                    push @{ $val->{$sf} }, $v;
620    
621                                                    # record repeatable subfield it it's offset
622                                                    push @{ $val->{subfields} }, ( $sf, $#{ $val->{$sf} } ) if (! $j_rs && $i_sf);
623                                                    $r_sf->{$sf}++;
624    
625                                            } elsif (defined( $val->{$sf} )) {
626    
627                                                    # convert scalar field to array
628                                                    $val->{$sf} = [ $val->{$sf}, $v ];
629    
630                                                    push @{ $val->{subfields} }, ( $sf, 1 ) if (! $j_rs && $i_sf);
631                                                    $r_sf->{$sf}++;
632    
633                                            } else {
634                                                    $val->{$sf} = $v;
635                                                    push @{ $val->{subfields} }, ( $sf, 0 ) if ($i_sf);
636                                            }
637                                  }                                  }
638                          } else {                          } else {
639                                  $val = $l;                                  $val = $l;
640                          }                          }
641    
642                          push @{$rec->{$k}}, $val;                          if ($j_rs) {
643                                    map {
644                                            $val->{$_} = join($j_rs, @{ $val->{$_} });
645                                    } keys %$r_sf
646                            }
647    
648                            push @{$rec->{$f_nr}}, $val;
649                  }                  }
650          }          }
651    
# Line 574  sub tag_name { Line 666  sub tag_name {
666          return $self->{'TagName'}->{$tag} || $tag;          return $self->{'TagName'}->{$tag} || $tag;
667  }  }
668    
669    
670    =head2 read_cnt
671    
672    Read content of C<.CNT> file and return hash containing it.
673    
674      print Dumper($isis->read_cnt);
675    
676    This function is not used by module (C<.CNT> files are not required for this
677    module to work), but it can be useful to examine your index (while debugging
678    for example).
679    
680    =cut
681    
682    sub read_cnt  {
683            my $self = shift;
684    
685            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
686    
687            # Get the index information from $db.CNT
688      
689            open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
690            binmode($fileCNT);
691    
692            my $buff;
693    
694            read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
695            $self->unpack_cnt($buff);
696    
697            read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
698            $self->unpack_cnt($buff);
699    
700            close($fileCNT);
701    
702            return $self->{cnt};
703    }
704    
705    =head2 unpack_cnt
706    
707    Unpack one of two 26 bytes fixed length record in C<.CNT> file.
708    
709    Here is definition of record:
710    
711     off key        description                             size
712      0: IDTYPE     BTree type                              s
713      2: ORDN       Nodes Order                             s
714      4: ORDF       Leafs Order                             s
715      6: N          Number of Memory buffers for nodes      s
716      8: K          Number of buffers for first level index s
717     10: LIV        Current number of Index Levels          s
718     12: POSRX      Pointer to Root Record in N0x           l
719     16: NMAXPOS    Next Available position in N0x          l
720     20: FMAXPOS    Next available position in L0x          l
721     24: ABNORMAL   Formal BTree normality indicator        s
722     length: 26 bytes
723    
724    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
725    
726    =cut
727    
728    sub unpack_cnt {
729            my $self = shift;
730    
731            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
732    
733            my $buff = shift || return;
734            my @arr = unpack("vvvvvvVVVv", $buff);
735    
736            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
737    
738            my $IDTYPE = shift @arr;
739            foreach (@flds) {
740                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
741            }
742    }
743    
744  1;  1;
745    
746  =head1 BUGS  =head1 BUGS
# Line 591  module with databases from programs othe Line 758  module with databases from programs othe
758  tested this against ouput of one C<isis.dll>-based application, but I don't  tested this against ouput of one C<isis.dll>-based application, but I don't
759  know any details about it's version.  know any details about it's version.
760    
761    =head1 VERSIONS
762    
763    As this is young module, new features are added in subsequent version. It's
764    a good idea to specify version when using this module like this:
765    
766      use Biblio::Isis 0.23
767    
768    Below is list of changes in specific version of module (so you can target
769    older versions if you really have to):
770    
771    =over 8
772    
773    =item 0.24
774    
775    Added C<ignore_empty_subfields>
776    
777    =item 0.23
778    
779    Added C<hash_filter> to L</to_hash>
780    
781    Fixed bug with documented C<join_subfields_with> in L</new> which wasn't
782    implemented
783    
784    =item 0.22
785    
786    Added field number when calling C<hash_filter>
787    
788    =item 0.21
789    
790    Added C<join_subfields_with> to L</new> and L</to_hash>.
791    
792    Added C<include_subfields> to L</to_hash>.
793    
794    =item 0.20
795    
796    Added C<< $isis->mfn >>, support for repeatable subfields and
797    C<< $isis->to_hash({ mfn => 42, ... }) >> calling convention
798    
799    =back
800    
801  =head1 AUTHOR  =head1 AUTHOR
802    
803          Dobrica Pavlinusic          Dobrica Pavlinusic
# Line 612  LICENSE file included with this module. Line 819  LICENSE file included with this module.
819    
820  =head1 SEE ALSO  =head1 SEE ALSO
821    
822    L<Biblio::Isis::Manual> for CDS/ISIS manual appendix F, G and H which describe file format
823    
824  OpenIsis web site L<http://www.openisis.org>  OpenIsis web site L<http://www.openisis.org>
825    
826  perl4lib site L<http://perl4lib.perl.org>  perl4lib site L<http://perl4lib.perl.org>
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