aboutsummaryrefslogtreecommitdiff
path: root/src/SemanticScuttle/Service/Tag2Tag.php
blob: 13d1f80a62f97af85b3010d4430b26fa4d5d75a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
<?php
/**
 * SemanticScuttle - your social bookmark manager.
 *
 * PHP version 5.
 *
 * @category Bookmarking
 * @package  SemanticScuttle
 * @author   Benjamin Huynh-Kim-Bang <mensonge@users.sourceforge.net>
 * @author   Christian Weiske <cweiske@cweiske.de>
 * @author   Eric Dane <ericdane@users.sourceforge.net>
 * @license  GPL http://www.gnu.org/licenses/gpl.html
 * @link     http://sourceforge.net/projects/semanticscuttle
 */

/**
 * SemanticScuttle tag-to-tag service.
 *
 * @category Bookmarking
 * @package  SemanticScuttle
 * @author   Benjamin Huynh-Kim-Bang <mensonge@users.sourceforge.net>
 * @author   Christian Weiske <cweiske@cweiske.de>
 * @author   Eric Dane <ericdane@users.sourceforge.net>
 * @license  GPL http://www.gnu.org/licenses/gpl.html
 * @link     http://sourceforge.net/projects/semanticscuttle
 */
class SemanticScuttle_Service_Tag2Tag extends SemanticScuttle_DbService
{
    /**
     * Returns the single service instance
     *
     * @param DB $db Database object
     *
     * @return SemanticScuttle_Service
     */
    public static function getInstance($db)
    {
        static $instance;
        if (!isset($instance)) {
            $instance = new self($db);
        }
        return $instance;
    }


    function __construct(&$db)
    {
        $this->db =& $db;
        $this->tablename = $GLOBALS['tableprefix'] .'tags2tags';
    }

    /**
     * Add a tag-to-tag link relation
     *
     * @param string  $tag1         First tag
     * @param string  $tag2         Second tag
     * @param string  $relationType Relation:
     *                              "=" (both tags are equal)
     *                              ">" (tag2 is part of tag1)
     * @param integer $uId          User ID
     *
     * @return boolean True when it was created, false in case of
     *                 an error or when the link already existed.
     */
    public function addLinkedTags($tag1, $tag2, $relationType, $uId)
    {
        $tagservice = SemanticScuttle_Service_Factory::get('Tag');
        $tag1 = $tagservice->normalize($tag1);
        $tag2 = $tagservice->normalize($tag2);

        if ($tag1 == $tag2 || strlen($tag1) == 0 || strlen($tag2) == 0
            || ($relationType != '>' && $relationType != '=')
            || !is_numeric($uId) || $uId<=0
            || ($this->existsLinkedTags($tag1, $tag2, $relationType, $uId))
        ) {
            return false;
        }

        $values = array(
            'tag1'         => $tag1,
            'tag2'         => $tag2,
            'relationType' => $relationType,
            'uId'          => $uId
        );
        $query = 'INSERT INTO ' . $this->getTableName()
            . ' ' . $this->db->sql_build_array('INSERT', $values);

        //die($query);
        if (!($dbresult = $this->db->sql_query($query))) {
            $this->db->sql_transaction('rollback');
            message_die(
                GENERAL_ERROR, 'Could not attach tag to tag',
                '', __LINE__, __FILE__, $query, $this->db
            );
            return false;
        }
        $this->db->sql_transaction('commit');

        // Update stats and cache
        $this->update($tag1, $tag2, $relationType, $uId);

        return true;
    }

    // Return linked tags just for admin users
    function getAdminLinkedTags($tag, $relationType, $inverseRelation = false, $stopList = array()) {
        // look for admin ids
        $userservice = SemanticScuttle_Service_Factory :: get('User');
        $adminIds = $userservice->getAdminIds();

        //ask for their linked tags
        return $this->getLinkedTags($tag, $relationType, $adminIds, $inverseRelation, $stopList);
    }

    // Return the target linked tags. If inverseRelation is true, return the source linked tags.
    function getLinkedTags($tag, $relationType, $uId = null, $inverseRelation = false, $stopList = array()) {
        // Set up the SQL query.
        if($inverseRelation) {
            $queriedTag = "tag1";
            $givenTag = "tag2";
        } else {
            $queriedTag = "tag2";
            $givenTag = "tag1";
        }

        $query = "SELECT DISTINCT ". $queriedTag ." as 'tag'";
        $query.= " FROM `". $this->getTableName() ."`";
        $query.= " WHERE 1=1";
        if($tag !=null) {
            $query.= " AND ". $givenTag ." = '". $tag ."'";
        }
        if($relationType) {
            $query.= " AND relationType = '". $relationType ."'";
        }
        if(is_array($uId)) {
            $query.= " AND ( 1=0 "; //tricks always false
            foreach($uId as $u) {
                $query.= " OR uId = '".$u."'";
            }
            $query.= " ) ";
        } elseif($uId != null) {
            $query.= " AND uId = '".$uId."'";
        }
        //die($query);
        if (! ($dbresult =& $this->db->sql_query($query)) ){
            message_die(GENERAL_ERROR, 'Could not get related tags', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        $rowset = $this->db->sql_fetchrowset($dbresult);
        $output = array();
        foreach($rowset as $row) {
            if(!in_array($row['tag'], $stopList)) {
                $output[] = $row['tag'];
            }
        }

        //bijective case for '='
        if($relationType == '=' && $inverseRelation == false) {
            //$stopList[] = $tag;
            $bijectiveOutput = $this->getLinkedTags($tag, $relationType, $uId, true, $stopList);
            $output = array_merge($output, $bijectiveOutput);
            //$output = array_unique($output); // remove duplication
        }

        $this->db->sql_freeresult($dbresult);
        return $output;
    }

    /*
     * Returns all linked tags (all descendants if relation is >,
     * all synonyms if relation is = )
     * $stopList allows to avoid cycle (a > b > a) between tags
     */
    function getAllLinkedTags($tag1, $relationType, $uId, $stopList=array()) {
        if(in_array($tag1, $stopList) || $tag1 == '') {
            return array();
        }

        // try to find data in cache
        $tcs = SemanticScuttle_Service_Factory::get('TagCache');
        if(count($stopList) == 0) {
            $activatedCache = true;
        } else {
            $activatedCache = false;
        }

        // look for existing links
        $stopList[] = $tag1;
        $linkedTags = $this->getLinkedTags($tag1, $relationType, $uId, false, $stopList);
        if($relationType != '=') {
            $linkedTags = array_merge($linkedTags, $this->getLinkedTags($tag1, '=', $uId, false, $stopList));
        }

        if(count($linkedTags) == 0) {
            return array();

        } else {
            // use cache if possible
            if($activatedCache) {
                if($relationType == '>') {
                    $output = $tcs->getChildren($tag1, $uId);
                } elseif($relationType == '=') {
                    $output = $tcs->getSynonyms($tag1, $uId);
                }
                if(count($output)>0) {
                    return $output;
                }
            }

            // else compute the links
            $output = array();

            foreach($linkedTags as $linkedTag) {
                $allLinkedTags = $this->getAllLinkedTags($linkedTag, $relationType, $uId, $stopList);
                $output[] = $linkedTag;
                if(is_array($allLinkedTags)) {
                    $output = array_merge($output, $allLinkedTags);
                } else {
                    $output[] = $allLinkedTags;
                }
            }

            // and save in cache
            if($activatedCache == true && $uId>0) {
                $tcs->updateTag($tag1, $relationType, $output, $uId);
            }

            //$output = array_unique($output); // remove duplication
            return $output;

        }
    }

    function getOrphewTags($relationType, $uId = 0, $limit = null, $orderBy = null) {
        $query = "SELECT DISTINCT tts.tag1 as tag";
        $query.= " FROM `". $this->getTableName() ."` tts";
        if($orderBy != null) {
            $tsts =SemanticScuttle_Service_Factory::get('TagStat');
            $query.= ", ".$tsts->getTableName() ." tsts";
        }
        $query.= " WHERE tts.tag1 <> ALL";
        $query.= " (SELECT DISTINCT tag2 FROM `". $this->getTableName() ."`";
        $query.= " WHERE relationType = '".$relationType."'";
        if($uId > 0) {
            $query.= " AND uId = '".$uId."'";
        }
        $query.= ")";
        if($uId > 0) {
            $query.= " AND tts.uId = '".$uId."'";
        }

        switch($orderBy) {
      case "nb":
          $query.= " AND tts.tag1 = tsts.tag1";
          $query.= " AND tsts.relationType = '".$relationType."'";
          if($uId > 0) {
              $query.= " AND tsts.uId = ".$uId;
          }
          $query.= " ORDER BY tsts.nb DESC";
          break;
      case "depth": // by nb of descendants
          $query.= " AND tts.tag1 = tsts.tag1";
          $query.= " AND tsts.relationType = '".$relationType."'";
          if($uId > 0) {
              $query.= " AND tsts.uId = ".$uId;
          }
          $query.= " ORDER BY tsts.depth DESC";
          break;
      case "nbupdate":
          $query.= " AND tts.tag1 = tsts.tag1";
          $query.= " AND tsts.relationType = '".$relationType."'";
          if($uId > 0) {
              $query.= " AND tsts.uId = ".$uId;
          }
          $query.= " ORDER BY tsts.nbupdate DESC";
          break;
        }

        if($limit != null) {
            $query.= " LIMIT 0,".$limit;
        }

        if (! ($dbresult =& $this->db->sql_query($query)) ){
            message_die(GENERAL_ERROR, 'Could not get linked tags', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }
        $output = $this->db->sql_fetchrowset($dbresult);
        $this->db->sql_freeresult($dbresult);
        return $output;
    }

    function getMenuTags($uId) {
        if(strlen($GLOBALS['menuTag']) < 1) {
            return array();
        } else {
            // we don't use the getAllLinkedTags function in order to improve performance
            $query = "SELECT tag2 as 'tag', COUNT(tag2) as 'count'";
            $query.= " FROM `". $this->getTableName() ."`";
            $query.= " WHERE tag1 = '".$GLOBALS['menuTag']."'";
            $query.= " AND relationType = '>'";
            if($uId > 0) {
                $query.= " AND uId = '".$uId."'";
            }
            $query.= " GROUP BY tag2";
            $query.= " ORDER BY count DESC";
            $query.= " LIMIT 0, ".$GLOBALS['maxSizeMenuBlock'];

            if (! ($dbresult =& $this->db->sql_query($query)) ){
                message_die(GENERAL_ERROR, 'Could not get linked tags', '', __LINE__, __FILE__, $query, $this->db);
                return false;
            }
            $output = $this->db->sql_fetchrowset($dbresult);
            $this->db->sql_freeresult($dbresult);
            return $output;
        }
    }


    function existsLinkedTags($tag1, $tag2, $relationType, $uId) {

        //$tag1 = mysql_real_escape_string($tag1);
        //$tag2 = mysql_real_escape_string($tag2);

        $query = "SELECT tag1, tag2, relationType, uId FROM `". $this->getTableName() ."`";
        $query.= " WHERE tag1 = '" .$tag1 ."'";
        $query.= " AND tag2 = '".$tag2."'";
        $query.= " AND relationType = '". $relationType ."'";
        $query.= " AND uId = '".$uId."'";

        //echo($query."<br>\n");

        $dbres = $this->db->sql_query($query);
        $hasTags = $this->db->sql_numrows($dbres) > 0;
        $this->db->sql_freeresult($dbres);
        return $hasTags;
    }

    function getLinks($uId) {
        $query = "SELECT tag1, tag2, relationType, uId FROM `". $this->getTableName() ."`";
        $query.= " WHERE 1=1";
        if($uId > 0) {
            $query.= " AND uId = '".$uId."'";
        }

        $dbres = $this->db->sql_query($query);
        $rowset = $this->db->sql_fetchrowset($dbres);
        $this->db->sql_freeresult($dbres);
        return $rowset;
    }

    function removeLinkedTags($tag1, $tag2, $relationType, $uId) {
        if(($tag1 != '' && $tag1 == $tag2) ||
        ($relationType != ">" && $relationType != "=" && $relationType != "") ||
        ($tag1 == '' && $tag2 == '')) {
            return false;
        }
        $query = 'DELETE FROM '. $this->getTableName();
        $query.= ' WHERE 1=1';
        $query.= strlen($tag1)>0 ? ' AND tag1 = "'. $tag1 .'"' : '';
        $query.= strlen($tag2)>0 ? ' AND tag2 = "'. $tag2 .'"' : '';
        $query.= strlen($relationType)>0 ? ' AND relationType = "'. $relationType .'"' : '';
        $query.= strlen($uId)>0 ? ' AND uId = "'. $uId .'"' : '';

        if (!($dbresult =& $this->db->sql_query($query))) {
            message_die(GENERAL_ERROR, 'Could not remove tag relation', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }


        // Update stats and cache
        $this->update($tag1, $tag2, $relationType, $uId);

        $this->db->sql_freeresult($dbresult);
        return true;
    }

    function removeLinkedTagsForUser($uId) {
        $query = 'DELETE FROM '. $this->getTableName();
        $query.= ' WHERE uId = "'. $uId .'"';

        if (!($dbresult =& $this->db->sql_query($query))) {
            message_die(GENERAL_ERROR, 'Could not remove tag relation', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }


        // Update stats and cache
        $this->update('', '', '', $uId);

        $this->db->sql_freeresult($dbresult);
        return true;
    }

    function renameTag($uId, $oldName, $newName) {
        $tagservice =SemanticScuttle_Service_Factory::get('Tag');
        $newName = $tagservice->normalize($newName);

        $query = 'UPDATE `'. $this->getTableName() .'`';
        $query.= ' SET tag1="'.$newName.'"';
        $query.= ' WHERE tag1="'.$oldName.'"';
        $query.= ' AND uId="'.$uId.'"';
        $this->db->sql_query($query);

        $query = 'UPDATE `'. $this->getTableName() .'`';
        $query.= ' SET tag2="'.$newName.'"';
        $query.= ' WHERE tag2="'.$oldName.'"';
        $query.= ' AND uId="'.$uId.'"';
        $this->db->sql_query($query);


        // Update stats and cache
        $this->update($oldName, NULL, '=', $uId);
        $this->update($oldName, NULL, '>', $uId);
        $this->update($newName, NULL, '=', $uId);
        $this->update($newName, NULL, '>', $uId);

        return true;

    }

    function update($tag1, $tag2, $relationType, $uId) {
        $tsts =SemanticScuttle_Service_Factory::get('TagStat');
        $tsts->updateStat($tag1, $relationType, $uId);

        $tcs = SemanticScuttle_Service_Factory::get('TagCache');
        $tcs->deleteByUser($uId);
    }

    function deleteAll() {
        $query = 'TRUNCATE TABLE `'. $this->getTableName() .'`';
        $this->db->sql_query($query);

        $tsts =SemanticScuttle_Service_Factory::get('TagStat');
        $tsts->deleteAll();
    }

}
?>