ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
ilSCTreeTasks Class Reference

Defines a system check task. More...

+ Collaboration diagram for ilSCTreeTasks:

Public Member Functions

 __construct (ilSCTask $task)
 
 getDB ()
 
 getTask ()
 
 validateStructure ()
 validate tree structure base on parent relation More...
 
 checkStructure ()
 
 validateDuplicates ()
 
 checkDuplicates ()
 Check for duplicates. More...
 
 findMissingTreeEntries ()
 
 findMissing ()
 Find missing objects. More...
 
 repairMissing ()
 Repair missing objects. More...
 
 repairMissingTreeEntries ()
 repair missing tree entries @global type $ilDB More...
 

Static Public Member Functions

static findDeepestDuplicate ()
 find duplicates @global type $ilDB More...
 
static repairPK ()
 
static getNodeInfo ($a_tree_id, $a_child)
 
static getChilds ($a_tree_id, $a_childs)
 
static findDuplicates ($a_duplicate_id)
 find duplicates @global type $ilDB More...
 
static hasDuplicate ($a_child)
 
static deleteDuplicateFromTree ($a_duplicate_id, $a_delete_trash)
 

Protected Member Functions

 repairMissingObject ($a_parent_ref, $a_ref_id)
 Repair missing object. More...
 
 readMissing ()
 Read missing objects in tree Entry in oject_reference but no entry in tree @global type $ilDB. More...
 
 deleteMissingTreeEntry ($a_tree_id, $a_ref_id)
 Delete missing tree entries from tree table. More...
 
 readMissingTreeEntries ()
 Read missing tree entries for referenced objects Entry in tree but no entry in object reference @global type $ilDB. More...
 
 createRecoveryContainer ()
 Create a reccovery folder. More...
 

Static Protected Member Functions

static deleteDuplicate ($tree_id, $dup_id)
 

Private Attributes

 $db = null
 
 $task = null
 

Detailed Description

Defines a system check task.

Author
Stefan Meyer smeye.nosp@m.r.il.nosp@m.ias@g.nosp@m.mx.d.nosp@m.e

Definition at line 9 of file class.ilSCTreeTasks.php.

Constructor & Destructor Documentation

◆ __construct()

ilSCTreeTasks::__construct ( ilSCTask  $task)

Definition at line 14 of file class.ilSCTreeTasks.php.

15 {
16 $this->db = $GLOBALS['ilDB'];
17 $this->task = $task;
18 }
$GLOBALS['PHPCAS_CLIENT']
This global variable is used by the interface class phpCAS.
Definition: CAS.php:276

References $GLOBALS, and $task.

Member Function Documentation

◆ checkDuplicates()

ilSCTreeTasks::checkDuplicates ( )

Check for duplicates.

Definition at line 270 of file class.ilSCTreeTasks.php.

271 {
272 $query = 'SELECT child, count(child) num FROM tree '.
273 'GROUP BY child '.
274 'HAVING count(child) > 1';
275 $res = $this->getDB()->query($query);
276
277 $GLOBALS['ilLog']->write($query);
278
279 $failures = array();
280 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
281 {
282 $failures[] = $row->child;
283 }
284 return $failures;
285 }
const DB_FETCHMODE_OBJECT
Definition: class.ilDB.php:11

References $GLOBALS, $query, $res, $row, DB_FETCHMODE_OBJECT, and getDB().

Referenced by validateDuplicates().

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◆ checkStructure()

ilSCTreeTasks::checkStructure ( )

Definition at line 225 of file class.ilSCTreeTasks.php.

226 {
227 return $GLOBALS['tree']->validateParentRelations();
228 global $ilDB;
229
230 $query = 'select child from tree child where not exists '.
231 '( '.
232 'select child from tree parent where child.parent = parent.child and (parent.lft < child.lft) and (parent.rgt > child.rgt) '.
233 ')'.
234 'and tree = 1 and child <> 1';
235 $res = $ilDB->query($query);
236
237 $failures = array();
238 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
239 {
240 $failures[] = $row->child;
241 }
242 return $failures;
243 }
global $ilDB

References $GLOBALS, $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by validateStructure().

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◆ createRecoveryContainer()

ilSCTreeTasks::createRecoveryContainer ( )
protected

Create a reccovery folder.

Definition at line 516 of file class.ilSCTreeTasks.php.

517 {
518 $now = new ilDateTime(time(),IL_CAL_UNIX);
519
520 include_once './Modules/Folder/classes/class.ilObjFolder.php';
521 $folder = new ilObjFolder();
522 $folder->setTitle('__System check recovery: '.$now->get(IL_CAL_DATETIME));
523 $folder->create();
524 $folder->createReference();
525 $folder->putInTree(RECOVERY_FOLDER_ID);
526
527 return $folder->getRefId();
528 }
const IL_CAL_UNIX
const IL_CAL_DATETIME
@classDescription Date and time handling
Class ilObjFolder.

References IL_CAL_DATETIME, and IL_CAL_UNIX.

Referenced by repairMissing().

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◆ deleteDuplicate()

static ilSCTreeTasks::deleteDuplicate (   $tree_id,
  $dup_id 
)
staticprotected

Definition at line 160 of file class.ilSCTreeTasks.php.

161 {
162 global $ilDB;
163
164 $query = 'SELECT child FROM tree '.
165 'WHERE parent = '.$ilDB->quote($dup_id,'integer').' '.
166 'AND tree = '.$ilDB->quote($tree_id,'integer');
167 $res = $ilDB->query($query);
168 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
169 {
170 // start recursion
171 self::deleteDuplicate($tree_id, $row->child);
172 }
173 // now delete node
174 if(self::hasDuplicate($dup_id))
175 {
176 $query = 'DELETE FROM tree '.
177 'WHERE child = '.$ilDB->quote($dup_id,'integer').' '.
178 'AND tree = '.$ilDB->quote($tree_id,'integer');
179 $ilDB->manipulate($query);
180 }
181 }
static deleteDuplicate($tree_id, $dup_id)

References $ilDB, $query, $res, $row, DB_FETCHMODE_OBJECT, and deleteDuplicate().

Referenced by deleteDuplicate(), and deleteDuplicateFromTree().

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◆ deleteDuplicateFromTree()

static ilSCTreeTasks::deleteDuplicateFromTree (   $a_duplicate_id,
  $a_delete_trash 
)
static

Definition at line 143 of file class.ilSCTreeTasks.php.

144 {
145 $dups = self::findDuplicates($a_duplicate_id);
146 foreach($dups as $dup)
147 {
148 if($a_delete_trash and $dup['tree'] < 1)
149 {
150 self::deleteDuplicate($dup['tree'],$dup['child']);
151 }
152 if(!$a_delete_trash and $dup['tree'] == 1)
153 {
154 self::deleteDuplicate($dup['tree'],$dup['child']);
155 }
156 }
157 return TRUE;
158 }
static findDuplicates($a_duplicate_id)
find duplicates @global type $ilDB

References deleteDuplicate(), and findDuplicates().

Referenced by ilSCTreeTasksGUI\deleteDuplicatesFromRepository(), and ilSCTreeTasksGUI\deleteDuplicatesFromTrash().

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◆ deleteMissingTreeEntry()

ilSCTreeTasks::deleteMissingTreeEntry (   $a_tree_id,
  $a_ref_id 
)
protected

Delete missing tree entries from tree table.

Definition at line 450 of file class.ilSCTreeTasks.php.

451 {
452 global $ilDB;
453
454 $query = 'SELECT child FROM tree '.
455 'WHERE parent = '.$ilDB->quote($a_ref_id,'integer').' '.
456 'AND tree = '.$ilDB->quote($a_tree_id,'integer');
457
458 $res = $ilDB->query($query);
459 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
460 {
461 // check for duplicates
462 $query = 'SELECT tree, child FROM tree '.
463 'WHERE child = '.$ilDB->quote($row->child);
464 $resd = $ilDB->query($query);
465 while($rowd = $resd->fetchRow(DB_FETCHMODE_OBJECT))
466 {
467 $this->deleteMissingTreeEntry($rowd->tree,$rowd->child);
468 }
469 }
470
471 // finally delete
472 include_once './Services/Object/classes/class.ilObjectFactory.php';
473 $factory = new ilObjectFactory();
474 $ref_obj = $factory->getInstanceByRefId($a_ref_id,FALSE);
475
476 if(($ref_obj instanceof ilObject) and $ref_obj->getType())
477 {
478 $ref_obj->delete();
479 }
480
481 $query = 'DELETE from tree '.
482 'WHERE tree = '.$ilDB->quote($a_tree_id).' '.
483 'AND child = '.$ilDB->quote($a_ref_id);
484 $ilDB->manipulate($query);
485 }
Class ilObjectFactory.
Class ilObject Basic functions for all objects.
deleteMissingTreeEntry($a_tree_id, $a_ref_id)
Delete missing tree entries from tree table.

References $ilDB, $query, $res, $row, DB_FETCHMODE_OBJECT, and deleteMissingTreeEntry().

Referenced by deleteMissingTreeEntry(), and repairMissingTreeEntries().

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◆ findDeepestDuplicate()

static ilSCTreeTasks::findDeepestDuplicate ( )
static

find duplicates @global type $ilDB

Returns
int

Definition at line 26 of file class.ilSCTreeTasks.php.

27 {
28 global $ilDB;
29
30 $query = 'SELECT child FROM tree first '.
31 'WHERE EXISTS ( '.
32 'SELECT child FROM tree second WHERE first.child = second.child '.
33 'GROUP BY child HAVING COUNT(child) > 1 ) '.
34 'ORDER BY depth DESC';
35
36 $GLOBALS['ilLog']->write($query);
37
38 $res = $ilDB->query($query);
39 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
40 {
41 return $row->child;
42 }
43 return 0;
44 }

References $GLOBALS, $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by ilSCTreeTasksGUI\repairDuplicates().

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◆ findDuplicates()

static ilSCTreeTasks::findDuplicates (   $a_duplicate_id)
static

find duplicates @global type $ilDB

Returns
type

Definition at line 108 of file class.ilSCTreeTasks.php.

109 {
110 global $ilDB;
111
112 $query = 'SELECT * FROM tree first '.
113 'WHERE EXISTS ( '.
114 'SELECT child FROM tree second WHERE first.child = second.child '.
115 'GROUP BY child HAVING COUNT(child) > 1 ) '.
116 'AND child = '.$ilDB->quote($a_duplicate_id,'integer').' '.
117 'ORDER BY depth DESC';
118 $res = $ilDB->query($query);
119
120 $GLOBALS['ilLog']->write($query);
121
122 $nodes = array();
123 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
124 {
125 $node = array();
126 $node['tree'] = $row->tree;
127 $node['child'] = $row->child;
128 $node['depth'] = $row->depth;
129
130 $nodes[] = $node;
131 }
132
133 return $nodes;
134 }

References $GLOBALS, $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by deleteDuplicateFromTree(), and ilSCTreeDuplicatesTableGUI\fillRow().

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◆ findMissing()

ilSCTreeTasks::findMissing ( )

Find missing objects.

Definition at line 311 of file class.ilSCTreeTasks.php.

312 {
313 global $ilDB;
314
315 $failures = $this->readMissing();
316
317 if(count($failures))
318 {
319 $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
320 }
321 else
322 {
323 $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
324 }
325
326 $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
327 $this->getTask()->update();
328 return count($failures);
329
330 }
const STATUS_COMPLETED
const STATUS_FAILED
readMissing()
Read missing objects in tree Entry in oject_reference but no entry in tree @global type $ilDB.

References $ilDB, getTask(), IL_CAL_UNIX, readMissing(), ilSCTask\STATUS_COMPLETED, and ilSCTask\STATUS_FAILED.

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◆ findMissingTreeEntries()

ilSCTreeTasks::findMissingTreeEntries ( )

Definition at line 287 of file class.ilSCTreeTasks.php.

288 {
289 global $ilDB;
290
291 $failures = $this->readMissingTreeEntries();
292
293 if(count($failures))
294 {
295 $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
296 }
297 else
298 {
299 $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
300 }
301
302 $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
303 $this->getTask()->update();
304 return count($failures);
305 }
readMissingTreeEntries()
Read missing tree entries for referenced objects Entry in tree but no entry in object reference @glob...

References $ilDB, getTask(), IL_CAL_UNIX, readMissingTreeEntries(), ilSCTask\STATUS_COMPLETED, and ilSCTask\STATUS_FAILED.

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◆ getChilds()

static ilSCTreeTasks::getChilds (   $a_tree_id,
  $a_childs 
)
static

Definition at line 88 of file class.ilSCTreeTasks.php.

89 {
90 global $ilDB;
91
92 $query = 'SELECT * FROM tree WHERE tree = '.$ilDB->quote($a_tree_id,'integer').' '.'AND child = '.$ilDB->quote($a_childs,'integer');
93 $res = $ilDB->query($query);
94
95 $childs = array();
96 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
97 {
98 $childs[] = $row->child;
99 }
100 return $childs;
101 }

References $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by ilSCTreeDuplicatesTableGUI\fillRow().

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◆ getDB()

ilSCTreeTasks::getDB ( )
Returns
ilDB

Definition at line 187 of file class.ilSCTreeTasks.php.

188 {
189 return $this->db;
190 }

References $db.

Referenced by checkDuplicates().

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◆ getNodeInfo()

static ilSCTreeTasks::getNodeInfo (   $a_tree_id,
  $a_child 
)
static

Definition at line 52 of file class.ilSCTreeTasks.php.

53 {
54 global $ilDB;
55
56 $query = 'SELECT * FROM tree WHERE child = '.$ilDB->quote($a_child,'integer').' AND tree = '. $ilDB->quote($a_tree_id,'integer');
57 $res = $ilDB->query($query);
58
59 $node = array();
60 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
61 {
62 $node['child'] = $row->child;
63 $node['tree'] = $row->tree;
64 $node['depth'] = $row->depth;
65
66 // read obj_id
67 $query = 'SELECT obj_id FROM object_reference WHERE ref_id = '.$ilDB->quote($a_child,'integer');
68 $ref_res = $ilDB->query($query);
69 while($ref_row = $ref_res->fetchRow(DB_FETCHMODE_OBJECT))
70 {
71 $node['obj_id'] = $ref_row->obj_id;
72
73 // read object info
74 $query = 'SELECT title, description, type FROM object_data '.
75 'WHERE obj_id = '.$ilDB->quote($ref_row->obj_id);
76 $obj_res = $ilDB->query($query);
77 while($obj_row = $obj_res->fetchRow(DB_FETCHMODE_OBJECT))
78 {
79 $node['title'] = $obj_row->title;
80 $node['description'] = $obj_row->description;
81 $node['type'] = $obj_row->type;
82 }
83 }
84 }
85 return $node;
86 }

References $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by ilSCTreeDuplicatesTableGUI\fillObjectRow().

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◆ getTask()

ilSCTreeTasks::getTask ( )
Returns
ilSCTask

Definition at line 196 of file class.ilSCTreeTasks.php.

197 {
198 return $this->task;
199 }

References $task.

Referenced by findMissing(), findMissingTreeEntries(), validateDuplicates(), and validateStructure().

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◆ hasDuplicate()

static ilSCTreeTasks::hasDuplicate (   $a_child)
static

Definition at line 136 of file class.ilSCTreeTasks.php.

137 {
138 global $ilDB;
139
140 return count(self::findDuplicates($a_child));
141 }

References $ilDB.

◆ readMissing()

ilSCTreeTasks::readMissing ( )
protected

Read missing objects in tree Entry in oject_reference but no entry in tree @global type $ilDB.

Returns
type

Definition at line 404 of file class.ilSCTreeTasks.php.

405 {
406 global $ilDB;
407
408 $query = 'SELECT ref_id FROM object_reference '.
409 'LEFT JOIN tree ON ref_id = child '.
410 'WHERE child IS NULL';
411 $res = $ilDB->query($query);
412
413 $failures = array();
414 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
415 {
416 $failures[] = $row->ref_id;
417 }
418 return $failures;
419 }

References $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by findMissing(), and repairMissing().

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◆ readMissingTreeEntries()

ilSCTreeTasks::readMissingTreeEntries ( )
protected

Read missing tree entries for referenced objects Entry in tree but no entry in object reference @global type $ilDB.

Returns
type

Definition at line 494 of file class.ilSCTreeTasks.php.

495 {
496 global $ilDB;
497
498 $query = 'SELECT child FROM tree '.
499 'LEFT JOIN object_reference ON child = ref_id '.
500 'WHERE ref_id IS NULL';
501
502 $res = $ilDB->query($query);
503
504 $failures = array();
505 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
506 {
507 $failures[] = $row->child;
508 }
509 return $failures;
510 }

References $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by findMissingTreeEntries(), and repairMissingTreeEntries().

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◆ repairMissing()

ilSCTreeTasks::repairMissing ( )

Repair missing objects.

Definition at line 335 of file class.ilSCTreeTasks.php.

336 {
337 $failures = $this->readMissing();
338 $recf_ref_id = $this->createRecoveryContainer();
339 foreach($failures as $ref_id)
340 {
341 $this->repairMissingObject($recf_ref_id,$ref_id);
342 }
343
344 }
createRecoveryContainer()
Create a reccovery folder.
repairMissingObject($a_parent_ref, $a_ref_id)
Repair missing object.
$ref_id
Definition: sahs_server.php:39

References $ref_id, createRecoveryContainer(), readMissing(), and repairMissingObject().

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◆ repairMissingObject()

ilSCTreeTasks::repairMissingObject (   $a_parent_ref,
  $a_ref_id 
)
protected

Repair missing object.

Parameters
type$a_parent_ref

Definition at line 350 of file class.ilSCTreeTasks.php.

351 {
352 global $ilDB;
353
354 // check if object entry exist
355 $query = 'SELECT obj_id FROM object_reference '.
356 'WHERE ref_id = '.$ilDB->quote($a_ref_id,'integer');
357
358 $res = $ilDB->query($query);
359 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
360 {
361 $query = 'SELECT type, title FROM object_data '.
362 'WHERE obj_id = '.$ilDB->quote($row->obj_id,'integer');
363 $ores = $ilDB->query($query);
364
365 $done = FALSE;
366 while($orow = $ores->fetchRow(DB_FETCHMODE_OBJECT))
367 {
368 $GLOBALS['ilLog']->write(__METHOD__.': Moving to recovery folder: '.$orow->type.': '.$orow->title);
369 $done = TRUE;
370
371 include_once './Services/Object/classes/class.ilObjectFactory.php';
372 $factory = new ilObjectFactory();
373 $ref_obj = $factory->getInstanceByRefId($a_ref_id,FALSE);
374
375 if($ref_obj instanceof ilObjRoleFolder)
376 {
377 $ref_obj->delete();
378 }
379 elseif($ref_obj instanceof ilObject)
380 {
381 $ref_obj->putInTree($a_parent_ref);
382 $ref_obj->setPermissions($a_parent_ref);
383 $GLOBALS['ilLog']->write(__METHOD__.': Moving finished');
384 break;
385 }
386 }
387 if(!$done)
388 {
389 // delete reference value
390 $query = 'DELETE FROM object_reference WHERE ref_id = '.$ilDB->quote($a_ref_id,'integer');
391 $ilDB->manipulate($query);
392 $GLOBALS['ilLog']->write(__METHOD__.': Delete reference for "object" without tree and object_data entry: ref_id= '.$a_ref_id );
393 }
394 }
395
396 }
Class ilObjRoleFolder.

References $GLOBALS, $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by repairMissing().

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◆ repairMissingTreeEntries()

ilSCTreeTasks::repairMissingTreeEntries ( )

repair missing tree entries @global type $ilDB

Definition at line 425 of file class.ilSCTreeTasks.php.

426 {
427 global $ilDB;
428
429 $missing = $this->readMissingTreeEntries();
430 $GLOBALS['ilLog']->write(__METHOD__.': '.print_r($missing,TRUE));
431
432 foreach($missing as $ref_id)
433 {
434 // check for duplicates
435 $query = 'SELECT tree, child FROM tree '.
436 'WHERE child = '.$ilDB->quote($ref_id);
437 $res = $ilDB->query($query);
438 while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
439 {
440 $GLOBALS['ilLog']->write(__METHOD__.': '.$row->tree.': '.$ref_id);
441
442 $this->deleteMissingTreeEntry($row->tree,$ref_id);
443 }
444 }
445 }

References $GLOBALS, $ilDB, $query, $ref_id, $res, $row, DB_FETCHMODE_OBJECT, deleteMissingTreeEntry(), and readMissingTreeEntries().

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◆ repairPK()

static ilSCTreeTasks::repairPK ( )
static

Definition at line 46 of file class.ilSCTreeTasks.php.

47 {
48 #$GLOBALS['ilDB']->dropPrimaryKey('tree');
49 $GLOBALS['ilDB']->addPrimaryKey('tree', array('child'));
50 }

References $GLOBALS.

Referenced by ilSCTreeTasksGUI\deleteDuplicatesFromRepository(), and ilSCTreeTasksGUI\deleteDuplicatesFromTrash().

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◆ validateDuplicates()

ilSCTreeTasks::validateDuplicates ( )

Definition at line 250 of file class.ilSCTreeTasks.php.

251 {
252 $failures = $this->checkDuplicates();
253
254 if(count($failures))
255 {
256 $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
257 }
258 else
259 {
260 $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
261 }
262 $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
263 $this->getTask()->update();
264 return count($failures);
265 }
checkDuplicates()
Check for duplicates.

References checkDuplicates(), getTask(), IL_CAL_UNIX, ilSCTask\STATUS_COMPLETED, and ilSCTask\STATUS_FAILED.

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◆ validateStructure()

ilSCTreeTasks::validateStructure ( )

validate tree structure base on parent relation

Returns
type

Definition at line 207 of file class.ilSCTreeTasks.php.

208 {
209 $failures = $this->checkStructure();
210
211 if(count($failures))
212 {
213 $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
214 }
215 else
216 {
217 $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
218 }
219 $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
220 $this->getTask()->update();
221 return count($failures);
222 }

References checkStructure(), getTask(), IL_CAL_UNIX, ilSCTask\STATUS_COMPLETED, and ilSCTask\STATUS_FAILED.

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Field Documentation

◆ $db

ilSCTreeTasks::$db = null
private

Definition at line 11 of file class.ilSCTreeTasks.php.

Referenced by getDB().

◆ $task

ilSCTreeTasks::$task = null
private

Definition at line 12 of file class.ilSCTreeTasks.php.

Referenced by __construct(), and getTask().


The documentation for this class was generated from the following file: