3 |
use warnings; |
use warnings; |
4 |
use strict; |
use strict; |
5 |
|
|
|
use blib; |
|
|
|
|
6 |
use WebPAC::Common; |
use WebPAC::Common; |
7 |
use base qw/WebPAC::Common/; |
use base qw/WebPAC::Common/; |
8 |
use Text::Iconv; |
use Text::Iconv; |
9 |
|
use Data::Dumper; |
10 |
|
|
11 |
=head1 NAME |
=head1 NAME |
12 |
|
|
13 |
WebPAC::Input - core module for input file format |
WebPAC::Input - read different file formats into WebPAC |
14 |
|
|
15 |
=head1 VERSION |
=head1 VERSION |
16 |
|
|
17 |
Version 0.02 |
Version 0.03 |
18 |
|
|
19 |
=cut |
=cut |
20 |
|
|
21 |
our $VERSION = '0.02'; |
our $VERSION = '0.03'; |
22 |
|
|
23 |
=head1 SYNOPSIS |
=head1 SYNOPSIS |
24 |
|
|
25 |
This module is used as base class for all database specific modules |
This module implements input as database which have fixed and known |
26 |
(basically, files which have one handle, fixed size while indexing and some |
I<size> while indexing and single unique numeric identifier for database |
27 |
kind of numeric idefinirier which goes from 1 to filesize). |
position ranging from 1 to I<size>. |
28 |
|
|
29 |
|
Simply, something that is indexed by unmber from 1 .. I<size>. |
30 |
|
|
31 |
|
Examples of such databases are CDS/ISIS files, MARC files, lines in |
32 |
|
text file, and so on. |
33 |
|
|
34 |
|
Specific file formats are implemented using low-level interface modules, |
35 |
|
located in C<WebPAC::Input::*> namespace which export C<open_db>, |
36 |
|
C<fetch_rec> and optional C<init> functions. |
37 |
|
|
38 |
Perhaps a little code snippet. |
Perhaps a little code snippet. |
39 |
|
|
40 |
use WebPAC::Input; |
use WebPAC::Input; |
41 |
|
|
42 |
my $db = WebPAC::Input->new( |
my $db = WebPAC::Input->new( |
43 |
format => 'NULL', |
module => 'WebPAC::Input::ISIS', |
44 |
config => $config, |
config => $config, |
45 |
lookup => $lookup_obj, |
lookup => $lookup_obj, |
46 |
low_mem => 1, |
low_mem => 1, |
47 |
); |
); |
48 |
|
|
49 |
$db->open('/path/to/database'); |
$db->open('/path/to/database'); |
50 |
print "database size: ",$db->size,"\n"; |
print "database size: ",$db->size,"\n"; |
51 |
while (my $row = $db->fetch) { |
while (my $rec = $db->fetch) { |
|
... |
|
52 |
} |
} |
53 |
|
|
54 |
|
|
55 |
|
|
56 |
=head1 FUNCTIONS |
=head1 FUNCTIONS |
57 |
|
|
58 |
=head2 new |
=head2 new |
60 |
Create new input database object. |
Create new input database object. |
61 |
|
|
62 |
my $db = new WebPAC::Input( |
my $db = new WebPAC::Input( |
63 |
format => 'NULL' |
module => 'WebPAC::Input::MARC', |
64 |
code_page => 'ISO-8859-2', |
code_page => 'ISO-8859-2', |
65 |
low_mem => 1, |
low_mem => 1, |
66 |
); |
); |
67 |
|
|
68 |
|
C<module> is low-level file format module. See L<WebPAC::Input::Isis> and |
69 |
|
L<WebPAC::Input::MARC>. |
70 |
|
|
71 |
Optional parametar C<code_page> specify application code page (which will be |
Optional parametar C<code_page> specify application code page (which will be |
72 |
used internally). This should probably be your terminal encoding, and by |
used internally). This should probably be your terminal encoding, and by |
73 |
default, it C<ISO-8859-2>. |
default, it C<ISO-8859-2>. |
86 |
|
|
87 |
my $log = $self->_get_logger; |
my $log = $self->_get_logger; |
88 |
|
|
89 |
|
$log->logconfess("specify low-level file format module") unless ($self->{module}); |
90 |
|
my $module = $self->{module}; |
91 |
|
$module =~ s#::#/#g; |
92 |
|
$module .= '.pm'; |
93 |
|
$log->debug("require low-level module $self->{module} from $module"); |
94 |
|
|
95 |
|
require $module; |
96 |
|
#eval $self->{module} .'->import'; |
97 |
|
|
98 |
# check if required subclasses are implemented |
# check if required subclasses are implemented |
99 |
foreach my $subclass (qw/open_db fetch_rec/) { |
foreach my $subclass (qw/open_db fetch_rec init/) { |
100 |
$log->logdie("missing implementation of $subclass") unless ($self->SUPER::can($subclass)); |
my $n = $self->{module} . '::' . $subclass; |
101 |
|
if (! defined &{ $n }) { |
102 |
|
my $missing = "missing $subclass in $self->{module}"; |
103 |
|
$self->{$subclass} = sub { $log->logwarn($missing) }; |
104 |
|
} else { |
105 |
|
$self->{$subclass} = \&{ $n }; |
106 |
|
} |
107 |
} |
} |
108 |
|
|
109 |
if ($self->can('init')) { |
if ($self->{init}) { |
110 |
$log->debug("calling init"); |
$log->debug("calling init"); |
111 |
$self->init(@_); |
$self->{init}->($self, @_); |
112 |
} |
} |
113 |
|
|
114 |
$self->{'code_page'} ||= 'ISO-8859-2'; |
$self->{'code_page'} ||= 'ISO-8859-2'; |
146 |
|
|
147 |
This function will read whole database in memory and produce lookups. |
This function will read whole database in memory and produce lookups. |
148 |
|
|
149 |
$isis->open( |
$input->open( |
150 |
path => '/path/to/database/file', |
path => '/path/to/database/file', |
151 |
code_page => '852', |
code_page => '852', |
152 |
limit_mfn => 500, |
limit => 500, |
153 |
start_mfn => 6000, |
offset => 6000, |
154 |
lookup => $lookup_obj, |
lookup => $lookup_obj, |
155 |
); |
); |
156 |
|
|
157 |
By default, C<code_page> is assumed to be C<852>. |
By default, C<code_page> is assumed to be C<852>. |
158 |
|
|
159 |
If optional parametar C<start_mfn> is set, this will be first MFN to read |
C<offset> is optional parametar to position at some offset before reading from database. |
|
from database (so you can skip beginning of your database if you need to). |
|
160 |
|
|
161 |
If optional parametar C<limit_mfn> is set, it will read just 500 records |
C<limit> is optional parametar to read just C<limit> records from database |
|
from database in example above. |
|
162 |
|
|
163 |
Returns size of database, regardless of C<start_mfn> and C<limit_mfn> |
Returns size of database, regardless of C<offset> and C<limit> |
164 |
parametars, see also C<$isis->size>. |
parametars, see also C<size>. |
165 |
|
|
166 |
=cut |
=cut |
167 |
|
|
175 |
my $code_page = $arg->{'code_page'} || '852'; |
my $code_page = $arg->{'code_page'} || '852'; |
176 |
|
|
177 |
# store data in object |
# store data in object |
178 |
$self->{'code_page'} = $code_page; |
$self->{'input_code_page'} = $code_page; |
179 |
foreach my $v (qw/path start_mfn limit_mfn/) { |
foreach my $v (qw/path offset limit/) { |
180 |
$self->{$v} = $arg->{$v} if ($arg->{$v}); |
$self->{$v} = $arg->{$v} if ($arg->{$v}); |
181 |
} |
} |
182 |
|
|
183 |
# create Text::Iconv object |
# create Text::Iconv object |
184 |
$self->{iconv} = Text::Iconv->new($code_page,$self->{'code_page'}); |
$self->{iconv} = Text::Iconv->new($code_page,$self->{'code_page'}); |
185 |
|
|
186 |
my ($db, $size) = $self->open_db( |
my ($db, $size) = $self->{open_db}->( $self, |
187 |
path => $arg->{path}, |
path => $arg->{path}, |
188 |
); |
); |
189 |
|
|
197 |
return; |
return; |
198 |
} |
} |
199 |
|
|
200 |
my $startmfn = 1; |
my $from_rec = 1; |
201 |
my $maxmfn = $size; |
my $to_rec = $size; |
202 |
|
|
203 |
if (my $s = $self->{start_mfn}) { |
if (my $s = $self->{offset}) { |
204 |
$log->info("skipping to MFN $s"); |
$log->info("skipping to MFN $s"); |
205 |
$startmfn = $s; |
$from_rec = $s; |
206 |
} else { |
} else { |
207 |
$self->{start_mfn} = $startmfn; |
$self->{offset} = $from_rec; |
208 |
} |
} |
209 |
|
|
210 |
if ($self->{limit_mfn}) { |
if ($self->{limit}) { |
211 |
$log->info("limiting to ",$self->{limit_mfn}," records"); |
$log->debug("limiting to ",$self->{limit}," records"); |
212 |
$maxmfn = $startmfn + $self->{limit_mfn} - 1; |
$to_rec = $from_rec + $self->{limit} - 1; |
213 |
$maxmfn = $size if ($maxmfn > $size); |
$to_rec = $size if ($to_rec > $size); |
214 |
} |
} |
215 |
|
|
216 |
# store size for later |
# store size for later |
217 |
$self->{size} = ($maxmfn - $startmfn) ? ($maxmfn - $startmfn + 1) : 0; |
$self->{size} = ($to_rec - $from_rec) ? ($to_rec - $from_rec + 1) : 0; |
218 |
|
|
219 |
$log->info("processing $self->{size} records in $code_page, convert to $self->{code_page}"); |
$log->info("processing $self->{size}/$size records [$from_rec-$to_rec] convert $code_page -> $self->{code_page}"); |
220 |
|
|
221 |
# read database |
# read database |
222 |
for (my $mfn = $startmfn; $mfn <= $maxmfn; $mfn++) { |
for (my $pos = $from_rec; $pos <= $to_rec; $pos++) { |
223 |
|
|
224 |
$log->debug("mfn: $mfn\n"); |
$log->debug("position: $pos\n"); |
225 |
|
|
226 |
my $rec = $self->fetch_rec( $db, $mfn ); |
my $rec = $self->{fetch_rec}->($self, $db, $pos ); |
227 |
|
|
228 |
|
$log->debug(sub { Dumper($rec) }); |
229 |
|
|
230 |
if (! $rec) { |
if (! $rec) { |
231 |
$log->warn("record $mfn empty? skipping..."); |
$log->warn("record $pos empty? skipping..."); |
232 |
next; |
next; |
233 |
} |
} |
234 |
|
|
235 |
# store |
# store |
236 |
if ($self->{'low_mem'}) { |
if ($self->{low_mem}) { |
237 |
$self->{'db'}->put($mfn, $rec); |
$self->{db}->put($pos, $rec); |
238 |
} else { |
} else { |
239 |
$self->{'data'}->{$mfn} = $rec; |
$self->{data}->{$pos} = $rec; |
240 |
} |
} |
241 |
|
|
242 |
# create lookup |
# create lookup |
243 |
$self->{'lookup'}->add( $rec ) if ($rec && $self->{'lookup'}); |
$self->{'lookup'}->add( $rec ) if ($rec && $self->{'lookup'}); |
244 |
|
|
245 |
$self->progress_bar($mfn,$maxmfn); |
$self->progress_bar($pos,$to_rec); |
246 |
|
|
247 |
} |
} |
248 |
|
|
249 |
$self->{'current_mfn'} = -1; |
$self->{pos} = -1; |
250 |
$self->{'last_pcnt'} = 0; |
$self->{last_pcnt} = 0; |
|
|
|
|
$log->debug("max mfn: $maxmfn"); |
|
251 |
|
|
252 |
# store max mfn and return it. |
# store max mfn and return it. |
253 |
$self->{'max_mfn'} = $maxmfn; |
$self->{max_pos} = $to_rec; |
254 |
|
$log->debug("max_pos: $to_rec"); |
255 |
|
|
256 |
return $size; |
return $size; |
257 |
} |
} |
272 |
|
|
273 |
my $log = $self->_get_logger(); |
my $log = $self->_get_logger(); |
274 |
|
|
275 |
$log->logconfess("it seems that you didn't load database!") unless ($self->{'current_mfn'}); |
$log->logconfess("it seems that you didn't load database!") unless ($self->{pos}); |
276 |
|
|
277 |
if ($self->{'current_mfn'} == -1) { |
if ($self->{pos} == -1) { |
278 |
$self->{'current_mfn'} = $self->{'start_mfn'}; |
$self->{pos} = $self->{offset}; |
279 |
} else { |
} else { |
280 |
$self->{'current_mfn'}++; |
$self->{pos}++; |
281 |
} |
} |
282 |
|
|
283 |
my $mfn = $self->{'current_mfn'}; |
my $mfn = $self->{pos}; |
284 |
|
|
285 |
if ($mfn > $self->{'max_mfn'}) { |
if ($mfn > $self->{max_pos}) { |
286 |
$self->{'current_mfn'} = $self->{'max_mfn'}; |
$self->{pos} = $self->{max_pos}; |
287 |
$log->debug("at EOF"); |
$log->debug("at EOF"); |
288 |
return; |
return; |
289 |
} |
} |
290 |
|
|
291 |
$self->progress_bar($mfn,$self->{'max_mfn'}); |
$self->progress_bar($mfn,$self->{max_pos}); |
292 |
|
|
293 |
my $rec; |
my $rec; |
294 |
|
|
295 |
if ($self->{'low_mem'}) { |
if ($self->{low_mem}) { |
296 |
$rec = $self->{'db'}->get($mfn); |
$rec = $self->{db}->get($mfn); |
297 |
} else { |
} else { |
298 |
$rec = $self->{'data'}->{$mfn}; |
$rec = $self->{data}->{$mfn}; |
299 |
} |
} |
300 |
|
|
301 |
$rec ||= 0E0; |
$rec ||= 0E0; |
313 |
|
|
314 |
sub pos { |
sub pos { |
315 |
my $self = shift; |
my $self = shift; |
316 |
return $self->{'current_mfn'}; |
return $self->{pos}; |
317 |
} |
} |
318 |
|
|
319 |
|
|
327 |
|
|
328 |
foreach my $mfn ( 1 ... $isis->size ) { ... } |
foreach my $mfn ( 1 ... $isis->size ) { ... } |
329 |
|
|
330 |
because it takes into account C<start_mfn> and C<limit_mfn>. |
because it takes into account C<offset> and C<limit>. |
331 |
|
|
332 |
=cut |
=cut |
333 |
|
|
334 |
sub size { |
sub size { |
335 |
my $self = shift; |
my $self = shift; |
336 |
return $self->{'size'}; |
return $self->{size}; |
337 |
} |
} |
338 |
|
|
339 |
=head2 seek |
=head2 seek |
355 |
if ($pos < 1) { |
if ($pos < 1) { |
356 |
$log->warn("seek before first record"); |
$log->warn("seek before first record"); |
357 |
$pos = 1; |
$pos = 1; |
358 |
} elsif ($pos > $self->{'max_mfn'}) { |
} elsif ($pos > $self->{max_pos}) { |
359 |
$log->warn("seek beyond last record"); |
$log->warn("seek beyond last record"); |
360 |
$pos = $self->{'max_mfn'}; |
$pos = $self->{max_pos}; |
361 |
} |
} |
362 |
|
|
363 |
return $self->{'current_mfn'} = (($pos - 1) || -1); |
return $self->{pos} = (($pos - 1) || -1); |
364 |
} |
} |
365 |
|
|
366 |
|
|