1 | ###########################################################################
|
---|
2 | #
|
---|
3 | # BaseClassifier.pm -- base class for all classifiers
|
---|
4 | #
|
---|
5 | # A component of the Greenstone digital library software
|
---|
6 | # from the New Zealand Digital Library Project at the
|
---|
7 | # University of Waikato, New Zealand.
|
---|
8 | #
|
---|
9 | # Copyright (C) 2000 New Zealand Digital Library Project
|
---|
10 | #
|
---|
11 | # This program is free software; you can redistribute it and/or modify
|
---|
12 | # it under the terms of the GNU General Public License as published by
|
---|
13 | # the Free Software Foundation; either version 2 of the License, or
|
---|
14 | # (at your option) any later version.
|
---|
15 | #
|
---|
16 | # This program is distributed in the hope that it will be useful,
|
---|
17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
19 | # GNU General Public License for more details.
|
---|
20 | #
|
---|
21 | # You should have received a copy of the GNU General Public License
|
---|
22 | # along with this program; if not, write to the Free Software
|
---|
23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
---|
24 | #
|
---|
25 | ###########################################################################
|
---|
26 |
|
---|
27 | package BaseClassifier;
|
---|
28 |
|
---|
29 | # How a classifier works.
|
---|
30 | #
|
---|
31 | # For each classifier requested in the collect.cfg file, buildcol.pl creates
|
---|
32 | # a new classifier object (a subclass of BaseClassifier). Later, it passes each
|
---|
33 | # document object to each classifier in turn for classification.
|
---|
34 | #
|
---|
35 | # Four primary functions are used:
|
---|
36 | #
|
---|
37 | # 1. "new" is called before the documents are processed to set up the
|
---|
38 | # classifier.
|
---|
39 | #
|
---|
40 | # 2. "init" is called after buildcol.pl has created the indexes etc but
|
---|
41 | # before the documents are classified in order that the classifier might
|
---|
42 | # set any variables it requires, etc.
|
---|
43 | #
|
---|
44 | # 3. "classify" is called once for each document object. The classifier
|
---|
45 | # "classifies" each document and updates its local data accordingly.
|
---|
46 | #
|
---|
47 | # 4. "get_classify_info" is called after every document has been
|
---|
48 | # classified. It collates the information about the documents and
|
---|
49 | # stores a reference to the classifier so that Greenstone can later
|
---|
50 | # display it.
|
---|
51 |
|
---|
52 | # 09/05/02 Added usage datastructure - John Thompson
|
---|
53 | # 28/11/03 Commented out verbosity argument - John Thompson
|
---|
54 |
|
---|
55 | use gsprintf;
|
---|
56 | use printusage;
|
---|
57 | use parse2;
|
---|
58 |
|
---|
59 | # suppress the annoying "subroutine redefined" warning that various
|
---|
60 | # classifiers cause under perl 5.6
|
---|
61 | $SIG{__WARN__} = sub {warn($_[0]) unless ($_[0] =~ /Subroutine\s+\S+\sredefined/)};
|
---|
62 |
|
---|
63 | use strict;
|
---|
64 | no strict 'subs'; # allow barewords (eg STDERR) as function arguments
|
---|
65 | no strict 'refs'; # allow filehandles to be variables and viceversa
|
---|
66 |
|
---|
67 | my $arguments =
|
---|
68 | [
|
---|
69 | { 'name' => "buttonname",
|
---|
70 | 'desc' => "{BasClas.buttonname}",
|
---|
71 | 'type' => "string",
|
---|
72 | 'deft' => "",
|
---|
73 | 'reqd' => "no" },
|
---|
74 | { 'name' => "no_metadata_formatting",
|
---|
75 | 'desc' => "{BasClas.no_metadata_formatting}",
|
---|
76 | 'type' => "flag" },
|
---|
77 | { 'name' => "builddir",
|
---|
78 | 'desc' => "{BasClas.builddir}",
|
---|
79 | 'type' => "string",
|
---|
80 | 'deft' => "" },
|
---|
81 | { 'name' => "outhandle",
|
---|
82 | 'desc' => "{BasClas.outhandle}",
|
---|
83 | 'type' => "string",
|
---|
84 | 'deft' => "STDERR" },
|
---|
85 | { 'name' => "verbosity",
|
---|
86 | 'desc' => "{BasClas.verbosity}",
|
---|
87 | # 'type' => "enum",
|
---|
88 | 'type' => "int",
|
---|
89 | 'deft' => "2",
|
---|
90 | 'reqd' => "no" }
|
---|
91 |
|
---|
92 | # { 'name' => "ignore_namespace",
|
---|
93 | # 'desc' => "{BasClas.ignore_namespace}",
|
---|
94 | # 'type' => "flag"}
|
---|
95 | ];
|
---|
96 |
|
---|
97 | my $options = { 'name' => "BaseClassifier",
|
---|
98 | 'desc' => "{BasClas.desc}",
|
---|
99 | 'abstract' => "yes",
|
---|
100 | 'inherits' => "no",
|
---|
101 | 'args' => $arguments };
|
---|
102 |
|
---|
103 |
|
---|
104 | sub gsprintf
|
---|
105 | {
|
---|
106 | return &gsprintf::gsprintf(@_);
|
---|
107 | }
|
---|
108 |
|
---|
109 |
|
---|
110 | sub print_xml_usage
|
---|
111 | {
|
---|
112 | my $self = shift(@_);
|
---|
113 | my $header = shift(@_);
|
---|
114 | my $high_level_information_only = shift(@_);
|
---|
115 |
|
---|
116 | # XML output is always in UTF-8
|
---|
117 | &gsprintf::output_strings_in_UTF8;
|
---|
118 |
|
---|
119 | if ($header) {
|
---|
120 | &PrintUsage::print_xml_header("classify");
|
---|
121 | }
|
---|
122 | $self->print_xml($high_level_information_only);
|
---|
123 | }
|
---|
124 |
|
---|
125 |
|
---|
126 | sub print_xml
|
---|
127 | {
|
---|
128 | my $self = shift(@_);
|
---|
129 | my $high_level_information_only = shift(@_);
|
---|
130 |
|
---|
131 | my $optionlistref = $self->{'option_list'};
|
---|
132 | my @optionlist = @$optionlistref;
|
---|
133 | my $classifieroptions = shift(@$optionlistref);
|
---|
134 | return if (!defined($classifieroptions));
|
---|
135 |
|
---|
136 | &gsprintf(STDERR, "<ClassInfo>\n");
|
---|
137 | &gsprintf(STDERR, " <Name>$classifieroptions->{'name'}</Name>\n");
|
---|
138 | my $desc = &gsprintf::lookup_string($classifieroptions->{'desc'});
|
---|
139 | $desc =~ s/</&lt;/g; # doubly escaped
|
---|
140 | $desc =~ s/>/&gt;/g;
|
---|
141 | &gsprintf(STDERR, " <Desc>$desc</Desc>\n");
|
---|
142 | &gsprintf(STDERR, " <Abstract>$classifieroptions->{'abstract'}</Abstract>\n");
|
---|
143 | &gsprintf(STDERR, " <Inherits>$classifieroptions->{'inherits'}</Inherits>\n");
|
---|
144 | unless (defined($high_level_information_only)) {
|
---|
145 | &gsprintf(STDERR, " <Arguments>\n");
|
---|
146 | if (defined($classifieroptions->{'args'})) {
|
---|
147 | &PrintUsage::print_options_xml($classifieroptions->{'args'});
|
---|
148 | }
|
---|
149 | &gsprintf(STDERR, " </Arguments>\n");
|
---|
150 |
|
---|
151 | # Recurse up the classifier hierarchy
|
---|
152 | $self->print_xml();
|
---|
153 | }
|
---|
154 | &gsprintf(STDERR, "</ClassInfo>\n");
|
---|
155 | }
|
---|
156 |
|
---|
157 |
|
---|
158 | sub print_txt_usage
|
---|
159 | {
|
---|
160 | my $self = shift(@_);
|
---|
161 |
|
---|
162 | # Print the usage message for a classifier (recursively)
|
---|
163 | my $descoffset = $self->determine_description_offset(0);
|
---|
164 | $self->print_classifier_usage($descoffset, 1);
|
---|
165 | }
|
---|
166 |
|
---|
167 |
|
---|
168 | sub determine_description_offset
|
---|
169 | {
|
---|
170 | my $self = shift(@_);
|
---|
171 | my $maxoffset = shift(@_);
|
---|
172 |
|
---|
173 | my $optionlistref = $self->{'option_list'};
|
---|
174 | my @optionlist = @$optionlistref;
|
---|
175 | my $classifieroptions = pop(@$optionlistref);
|
---|
176 | return $maxoffset if (!defined($classifieroptions));
|
---|
177 |
|
---|
178 | # Find the length of the longest option string of this classifier
|
---|
179 | my $classifierargs = $classifieroptions->{'args'};
|
---|
180 | if (defined($classifierargs)) {
|
---|
181 | my $longest = &PrintUsage::find_longest_option_string($classifierargs);
|
---|
182 | if ($longest > $maxoffset) {
|
---|
183 | $maxoffset = $longest;
|
---|
184 | }
|
---|
185 | }
|
---|
186 |
|
---|
187 | # Recurse up the classifier hierarchy
|
---|
188 | $maxoffset = $self->determine_description_offset($maxoffset);
|
---|
189 | $self->{'option_list'} = \@optionlist;
|
---|
190 | return $maxoffset;
|
---|
191 | }
|
---|
192 |
|
---|
193 |
|
---|
194 | sub print_classifier_usage
|
---|
195 | {
|
---|
196 | my $self = shift(@_);
|
---|
197 | my $descoffset = shift(@_);
|
---|
198 | my $isleafclass = shift(@_);
|
---|
199 |
|
---|
200 | my $optionlistref = $self->{'option_list'};
|
---|
201 | my @optionlist = @$optionlistref;
|
---|
202 | my $classifieroptions = shift(@$optionlistref);
|
---|
203 | return if (!defined($classifieroptions));
|
---|
204 |
|
---|
205 | my $classifiername = $classifieroptions->{'name'};
|
---|
206 | my $classifierargs = $classifieroptions->{'args'};
|
---|
207 | my $classifierdesc = $classifieroptions->{'desc'};
|
---|
208 | # Produce the usage information using the data structure above
|
---|
209 | if ($isleafclass) {
|
---|
210 | if (defined($classifierdesc)) {
|
---|
211 | &gsprintf(STDERR, "$classifierdesc\n\n");
|
---|
212 | }
|
---|
213 | &gsprintf(STDERR, " {common.usage}: classify $classifiername [{common.options}]\n\n");
|
---|
214 |
|
---|
215 | }
|
---|
216 |
|
---|
217 | # Display the classifier options, if there are some
|
---|
218 | if (defined($classifierargs)) {
|
---|
219 | # Calculate the column offset of the option descriptions
|
---|
220 | my $optiondescoffset = $descoffset + 2; # 2 spaces between options & descriptions
|
---|
221 |
|
---|
222 | if ($isleafclass) {
|
---|
223 | &gsprintf(STDERR, " {common.specific_options}:\n");
|
---|
224 | }
|
---|
225 | else {
|
---|
226 | &gsprintf(STDERR, " {common.general_options}:\n", $classifiername);
|
---|
227 | }
|
---|
228 |
|
---|
229 | # Display the classifier options
|
---|
230 | &PrintUsage::print_options_txt($classifierargs, $optiondescoffset);
|
---|
231 | }
|
---|
232 |
|
---|
233 | # Recurse up the classifier hierarchy
|
---|
234 | $self->print_classifier_usage($descoffset, 0);
|
---|
235 | $self->{'option_list'} = \@optionlist;
|
---|
236 | }
|
---|
237 |
|
---|
238 |
|
---|
239 | sub new {
|
---|
240 | my ($class) = shift (@_);
|
---|
241 | my ($classifierslist,$args,$hashArgOptLists) = @_;
|
---|
242 | push(@$classifierslist, $class);
|
---|
243 | my $classifier_name = (defined $classifierslist->[0]) ? $classifierslist->[0] : $class;
|
---|
244 |
|
---|
245 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
|
---|
246 | push(@{$hashArgOptLists->{"OptList"}},$options);
|
---|
247 |
|
---|
248 |
|
---|
249 | # Manually set $self parameters.
|
---|
250 | my $self = {};
|
---|
251 | $self->{'outhandle'} = STDERR;
|
---|
252 | $self->{'idnum'} = -1;
|
---|
253 | $self->{'option_list'} = $hashArgOptLists->{"OptList"};
|
---|
254 | $self->{"info_only"} = 0;
|
---|
255 |
|
---|
256 | # Check if gsdlinfo is in the argument list or not - if it is, don't parse
|
---|
257 | # the args, just return the object.
|
---|
258 | foreach my $strArg (@{$args})
|
---|
259 | {
|
---|
260 | if($strArg eq "-gsdlinfo")
|
---|
261 | {
|
---|
262 | $self->{"info_only"} = 1;
|
---|
263 | return bless $self, $class;
|
---|
264 | }
|
---|
265 | }
|
---|
266 |
|
---|
267 | # general options available to all classifiers
|
---|
268 | if(parse2::parse($args,$hashArgOptLists->{"ArgList"},$self) == -1)
|
---|
269 | {
|
---|
270 | #print out the text usage of this classifier.
|
---|
271 | my $classTempClass = bless $self, $class;
|
---|
272 | print STDERR "<BadClassifier c=$classifier_name>\n";
|
---|
273 |
|
---|
274 | &gsprintf(STDERR, "\n{BasClas.bad_general_option}\n", $classifier_name);
|
---|
275 | $classTempClass->print_txt_usage(""); # Use default resource bundle
|
---|
276 | die "\n";
|
---|
277 | }
|
---|
278 |
|
---|
279 | delete $self->{"info_only"};
|
---|
280 |
|
---|
281 | # We now ensure that when text files (and even colcfg) are read in,
|
---|
282 | # they are straightaway made to be Unicode aware strings in Perl
|
---|
283 |
|
---|
284 | return bless $self, $class;
|
---|
285 | }
|
---|
286 |
|
---|
287 | sub init {
|
---|
288 | my $self = shift (@_);
|
---|
289 |
|
---|
290 | $self->{'supportsmemberof'} = &supports_memberof();
|
---|
291 | }
|
---|
292 |
|
---|
293 | sub set_number {
|
---|
294 | my $self = shift (@_);
|
---|
295 | my ($id) = @_;
|
---|
296 | $self->{'idnum'} = $id;
|
---|
297 | }
|
---|
298 |
|
---|
299 | sub get_number {
|
---|
300 | my $self = shift (@_);
|
---|
301 | return $self->{'idnum'};
|
---|
302 | }
|
---|
303 |
|
---|
304 | sub oid_array_delete
|
---|
305 | {
|
---|
306 | my $self = shift (@_);
|
---|
307 | my ($delete_oid,$field) = @_;
|
---|
308 |
|
---|
309 | my $outhandle = $self->{'outhandle'};
|
---|
310 |
|
---|
311 | my @filtered_list = ();
|
---|
312 | foreach my $existing_oid (@{$self->{$field}}) {
|
---|
313 | if ($existing_oid eq $delete_oid) {
|
---|
314 | print $outhandle " Deleting old $delete_oid for ", ref $self, "\n";
|
---|
315 | }
|
---|
316 | else {
|
---|
317 | push(@filtered_list,$existing_oid);
|
---|
318 | }
|
---|
319 | }
|
---|
320 | $self->{$field} = \@filtered_list;
|
---|
321 | }
|
---|
322 |
|
---|
323 | sub oid_hash_delete
|
---|
324 | {
|
---|
325 | my $self = shift (@_);
|
---|
326 | my ($delete_oid,$field) = @_;
|
---|
327 |
|
---|
328 | my $outhandle = $self->{'outhandle'};
|
---|
329 |
|
---|
330 | print $outhandle " Deleting old $delete_oid for ", ref $self, "\n";
|
---|
331 | delete $self->{$field}->{$delete_oid};
|
---|
332 | }
|
---|
333 |
|
---|
334 | sub classify {
|
---|
335 | my $self = shift (@_);
|
---|
336 | my ($doc_obj) = @_;
|
---|
337 |
|
---|
338 | my $outhandle = $self->{'outhandle'};
|
---|
339 | &gsprintf($outhandle, "BaseClassifier::classify {common.must_be_implemented}\n");
|
---|
340 | }
|
---|
341 |
|
---|
342 | sub get_classify_info {
|
---|
343 | my $self = shift (@_);
|
---|
344 |
|
---|
345 | my $outhandle = $self->{'outhandle'};
|
---|
346 | &gsprintf($outhandle, "BaseClassifier::get_classify_info {common.must_be_implemented}\n");
|
---|
347 | }
|
---|
348 |
|
---|
349 | sub supports_memberof {
|
---|
350 | my $self = shift(@_);
|
---|
351 |
|
---|
352 | return "false";
|
---|
353 | }
|
---|
354 |
|
---|
355 | # previously, if a buttonname wasn't specified, we just use the metadata value,
|
---|
356 | # but with a list of metadata, we want to do something a bit nicer so that
|
---|
357 | # eg -metadata dc.Title,Title will end up with Title as the buttonname
|
---|
358 |
|
---|
359 | # current algorithm - use the first element, but strip its namespace
|
---|
360 | sub generate_title_from_metadata {
|
---|
361 |
|
---|
362 | my $self = shift (@_);
|
---|
363 | my $metadata = shift (@_);
|
---|
364 |
|
---|
365 | return "" unless defined $metadata && $metadata =~ /\S/;
|
---|
366 |
|
---|
367 | my @metalist = split(/,|;/, $metadata);
|
---|
368 | my $firstmeta = $metalist[0];
|
---|
369 | if ($firstmeta =~ /\./) {
|
---|
370 | $firstmeta =~ s/^\w+\.//;
|
---|
371 | }
|
---|
372 | return $firstmeta;
|
---|
373 | }
|
---|
374 |
|
---|
375 |
|
---|
376 | # ex. can be at front, or it may be a list of metadata, separated by ,/;
|
---|
377 | sub strip_ex_from_metadata {
|
---|
378 | my $self = shift (@_);
|
---|
379 | my $metadata = shift (@_);
|
---|
380 |
|
---|
381 | return $metadata unless defined $metadata && $metadata =~ /\S/;
|
---|
382 |
|
---|
383 | # only remove ex. metadata prefix if there are no other prefixes after it
|
---|
384 | $metadata =~ s/(,|;|:|\/)/$1 /g; # insert a space separator so meta names like flex.Image don't become fl.Image
|
---|
385 | $metadata =~ s/(^| )ex\.([^.,;:\/]+)(,|;|:|\/|$)/$1$2$3/g;
|
---|
386 | $metadata =~ s/(,|;|:|\/) /$1/g;
|
---|
387 |
|
---|
388 | return $metadata;
|
---|
389 | }
|
---|
390 |
|
---|
391 |
|
---|
392 | 1;
|
---|