ILIAS  release_10 Revision v10.1-43-ga1241a92c2f
class.ilNestedSetTree.php
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1 <?php
2 
19 declare(strict_types=1);
20 
27 class ilNestedSetTree implements ilTreeImplementation
28 {
29  protected ilTree $tree;
30  protected ilDBInterface $db;
31 
35  public function __construct(ilTree $a_tree)
36  {
37  global $DIC;
38 
39  $this->tree = $a_tree;
40  $this->db = $DIC->database();
41  }
42 
43  protected function getTree(): \ilTree
44  {
45  return $this->tree;
46  }
47 
52  public function getSubTreeIds(int $a_node_id): array
53  {
54  $query = 'SELECT s.child FROM ' .
55  $this->getTree()->getTreeTable() . ' s, ' .
56  $this->getTree()->getTreeTable() . ' t ' .
57  'WHERE t.child = %s ' .
58  'AND s.lft > t.lft ' .
59  'AND s.rgt < t.rgt ' .
60  'AND s.' . $this->getTree()->getTreePk() . ' = %s';
61 
62  $res = $this->db->queryF(
63  $query,
64  array('integer', 'integer'),
65  array($a_node_id, $this->getTree()->getTreeId())
66  );
67  $childs = [];
68  while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
69  $childs[] = (int) $row->child;
70  }
71  return $childs;
72  }
73 
77  public function getTrashSubTreeQuery(
78  array $a_node,
79  array $a_types,
80  bool $a_force_join_reference = true,
81  array $a_fields = []
82  ): string {
83  $type_str = '';
84  if (is_array($a_types)) {
85  if ($a_types) {
86  $type_str = "AND " . $this->db->in(
87  $this->getTree()->getObjectDataTable() . ".type",
88  $a_types,
89  false,
90  "text"
91  );
92  }
93  }
94 
95  $join = '';
96  if ($type_str || $a_force_join_reference) {
97  $join = $this->getTree()->buildJoin();
98  }
99 
100  $fields = '* ';
101  if (count($a_fields)) {
102  $fields = implode(',', $a_fields);
103  }
104 
105  $query = 'SELECT ' .
106  $fields . ' ' .
107  "FROM " . $this->getTree()->getTreeTable() . " " .
108  $join . ' ' .
109  "WHERE " . $this->getTree()->getTreeTable() . '.lft ' .
110  'BETWEEN ' . $this->db->quote($a_node['lft'], 'integer') . ' ' .
111  'AND ' . $this->db->quote($a_node['rgt'], 'integer') . ' ' .
112  "AND " . $this->getTree()->getTreeTable() . "." . $this->getTree()->getTreePk() . ' < 0 ' .
113  $type_str . ' ' .
114  "ORDER BY " . $this->getTree()->getTreeTable() . ".lft";
115 
116  return $query;
117  }
118 
122  public function getSubTreeQuery(
123  array $a_node,
124  array $a_types = [],
125  bool $a_force_join_reference = true,
126  array $a_fields = []
127  ): string {
128  $type_str = '';
129  if (count($a_types)) {
130  if ($a_types) {
131  $type_str = "AND " . $this->db->in(
132  $this->getTree()->getObjectDataTable() . ".type",
133  $a_types,
134  false,
135  "text"
136  );
137  }
138  }
139 
140 
141  $join = '';
142  if ($type_str || $a_force_join_reference) {
143  $join = $this->getTree()->buildJoin();
144  }
145 
146  $fields = '* ';
147  if (count($a_fields)) {
148  $fields = implode(',', $a_fields);
149  }
150 
151  $query = 'SELECT ' .
152  $fields . ' ' .
153  "FROM " . $this->getTree()->getTreeTable() . " " .
154  $join . ' ' .
155  "WHERE " . $this->getTree()->getTreeTable() . '.lft ' .
156  'BETWEEN ' . $this->db->quote($a_node['lft'], 'integer') . ' ' .
157  'AND ' . $this->db->quote($a_node['rgt'], 'integer') . ' ' .
158  "AND " . $this->getTree()->getTreeTable() . "." . $this->getTree()->getTreePk() . " = " . $this->db->quote(
159  $this->getTree()->getTreeId(),
160  'integer'
161  ) . ' ' .
162  $type_str . ' ' .
163  "ORDER BY " . $this->getTree()->getTreeTable() . ".lft";
164  return $query;
165  }
166 
170  public function getRelation(array $a_node_a, array $a_node_b): int
171  {
172  if ($a_node_a === [] || $a_node_b === []) {
173  return ilTree::RELATION_NONE;
174  }
175  if ($a_node_a['child'] == $a_node_b['child']) {
176  return ilTree::RELATION_EQUALS;
177  }
178  if ($a_node_a['lft'] < $a_node_b['lft'] && $a_node_a['rgt'] > $a_node_b['rgt']) {
179  return ilTree::RELATION_PARENT;
180  }
181  if ($a_node_b['lft'] < $a_node_a['lft'] && $a_node_b['rgt'] > $a_node_a['rgt']) {
182  return ilTree::RELATION_CHILD;
183  }
184 
185  // if node is also parent of node b => sibling
186  if ($a_node_a['parent'] == $a_node_b['parent']) {
187  return ilTree::RELATION_SIBLING;
188  }
189  return ilTree::RELATION_NONE;
190  }
191 
192  public function getPathIds(int $a_endnode, int $a_startnode = 0): array
193  {
194  return $this->getPathIdsUsingAdjacencyMap($a_endnode, $a_startnode);
195  }
196 
200  public function insertNode(int $a_node_id, int $a_parent_id, int $a_pos): void
201  {
202  $insert_node_callable = function (ilDBInterface $db) use ($a_node_id, $a_parent_id, $a_pos): void {
203  switch ($a_pos) {
204  case ilTree::POS_FIRST_NODE:
205 
206  // get left value of parent
207  $query = sprintf(
208  'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
209  'WHERE child = %s ' .
210  'AND ' . $this->getTree()->getTreePk() . ' = %s ',
211  $this->db->quote($a_parent_id, 'integer'),
212  $this->db->quote($this->getTree()->getTreeId(), 'integer')
213  );
214 
215  $res = $this->db->query($query);
216  $r = $this->db->fetchObject($res);
217 
218  if ($r->parent === null) {
219  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR);
220  throw new ilInvalidTreeStructureException('Parent with id ' . $a_parent_id . ' not found in tree');
221  }
222 
223  $left = $r->lft;
224  $lft = $left + 1;
225  $rgt = $left + 2;
226 
227  if ($this->getTree()->__isMainTree()) {
228  $query = sprintf(
229  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
230  'lft = CASE WHEN lft > %s THEN lft + 2 ELSE lft END, ' .
231  'rgt = CASE WHEN rgt > %s THEN rgt + 2 ELSE rgt END ',
232  $this->db->quote($left, 'integer'),
233  $this->db->quote($left, 'integer')
234  );
235  $res = $this->db->manipulate($query);
236  } else {
237  $query = sprintf(
238  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
239  'lft = CASE WHEN lft > %s THEN lft + 2 ELSE lft END, ' .
240  'rgt = CASE WHEN rgt > %s THEN rgt + 2 ELSE rgt END ' .
241  'WHERE ' . $this->getTree()->getTreePk() . ' = %s ',
242  $this->db->quote($left, 'integer'),
243  $this->db->quote($left, 'integer'),
244  $this->db->quote($this->getTree()->getTreeId(), 'integer')
245  );
246  $res = $this->db->manipulate($query);
247  }
248 
249  break;
250 
251  case ilTree::POS_LAST_NODE:
252  // Special treatment for trees with gaps
253  if ($this->getTree()->getGap() > 0) {
254  // get lft and rgt value of parent
255  $query = sprintf(
256  'SELECT rgt,lft,parent FROM ' . $this->getTree()->getTreeTable() . ' ' .
257  'WHERE child = %s ' .
258  'AND ' . $this->getTree()->getTreePk() . ' = %s',
259  $this->db->quote($a_parent_id, 'integer'),
260  $this->db->quote($this->getTree()->getTreeId(), 'integer')
261  );
262  $res = $this->db->query($query);
263  $r = $this->db->fetchAssoc($res);
264 
265  if ($r['parent'] === null) {
266  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR);
267  throw new ilInvalidTreeStructureException('Parent with id ' . $a_parent_id . ' not found in tree');
268  }
269  $parentRgt = (int) $r['rgt'];
270  $parentLft = (int) $r['lft'];
271 
272  // Get the available space, without taking children into account yet
273  $availableSpace = $parentRgt - $parentLft;
274  if ($availableSpace < 2) {
275  // If there is not enough space between parent lft and rgt, we don't need
276  // to look any further, because we must spread the tree.
277  $lft = $parentRgt;
278  } else {
279  // If there is space between parent lft and rgt, we need to check
280  // whether there is space left between the rightmost child of the
281  // parent and parent rgt.
282  if ($this->getTree()->__isMainTree()) {
283  $query = sprintf(
284  'SELECT MAX(rgt) max_rgt FROM ' . $this->getTree()->getTreeTable() . ' ' .
285  'WHERE parent = %s ',
286  $this->db->quote($a_parent_id, 'integer')
287  );
288  $res = $this->db->query($query);
289  $r = $this->db->fetchAssoc($res);
290  } else {
291  $query = sprintf(
292  'SELECT MAX(rgt) max_rgt FROM ' . $this->getTree()->getTreeTable() . ' ' .
293  'WHERE parent = %s ' .
294  'AND ' . $this->getTree()->getTreePk() . ' = %s',
295  $this->db->quote($a_parent_id, 'integer'),
296  $this->db->quote($this->getTree()->getTreeId(), 'integer')
297  );
298  $res = $this->db->query($query);
299  $r = $this->db->fetchAssoc($res);
300  }
301 
302  if (isset($r['max_rgt'])) {
303  // If the parent has children, we compute the available space
304  // between rgt of the rightmost child and parent rgt.
305  $availableSpace = $parentRgt - $r['max_rgt'];
306  $lft = $r['max_rgt'] + 1;
307  } else {
308  // If the parent has no children, we know now, that we can
309  // add the new node at parent lft + 1 without having to spread
310  // the tree.
311  $lft = $parentLft + 1;
312  }
313  }
314  $rgt = $lft + 1;
315 
316  // spread tree if there is not enough space to insert the new node
317  if ($availableSpace < 2) {
318  if ($this->getTree()->__isMainTree()) {
319  $query = sprintf(
320  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
321  'lft = CASE WHEN lft > %s THEN lft + %s ELSE lft END, ' .
322  'rgt = CASE WHEN rgt >= %s THEN rgt + %s ELSE rgt END ',
323  $this->db->quote($parentRgt, 'integer'),
324  $this->db->quote((2 + $this->getTree()->getGap() * 2), 'integer'),
325  $this->db->quote($parentRgt, 'integer'),
326  $this->db->quote((2 + $this->getTree()->getGap() * 2), 'integer')
327  );
328  $res = $this->db->manipulate($query);
329  } else {
330  $query = sprintf(
331  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
332  'lft = CASE WHEN lft > %s THEN lft + %s ELSE lft END, ' .
333  'rgt = CASE WHEN rgt >= %s THEN rgt + %s ELSE rgt END ' .
334  'WHERE ' . $this->getTree()->getTreePk() . ' = %s ',
335  $this->db->quote($parentRgt, 'integer'),
336  $this->db->quote((2 + $this->getTree()->getGap() * 2), 'integer'),
337  $this->db->quote($parentRgt, 'integer'),
338  $this->db->quote((2 + $this->getTree()->getGap() * 2), 'integer'),
339  $this->db->quote($this->getTree()->getTreeId(), 'integer')
340  );
341  $res = $this->db->manipulate($query);
342  }
343  }
344  } // Treatment for trees without gaps
345  else {
346  // get right value of parent
347  if ($this->getTree()->__isMainTree()) {
348  $query = sprintf(
349  'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
350  'WHERE child = %s ',
351  $this->db->quote($a_parent_id, 'integer')
352  );
353  $res = $this->db->query($query);
354  } else {
355  $query = sprintf(
356  'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
357  'WHERE child = %s ' .
358  'AND ' . $this->getTree()->getTreePk() . ' = %s ',
359  $this->db->quote($a_parent_id, 'integer'),
360  $this->db->quote($this->getTree()->getTreeId(), 'integer')
361  );
362  $res = $this->db->query($query);
363  }
364  $r = $this->db->fetchObject($res);
365 
366  if ($r->parent === null) {
367  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR);
368  throw new ilInvalidTreeStructureException('Parent with id ' . $a_parent_id . ' not found in tree');
369  }
370 
371  $right = $r->rgt;
372  $lft = $right;
373  $rgt = $right + 1;
374 
375  // spread tree
376  if ($this->getTree()->__isMainTree()) {
377  $query = sprintf(
378  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
379  'lft = CASE WHEN lft > %s THEN lft + 2 ELSE lft END, ' .
380  'rgt = CASE WHEN rgt >= %s THEN rgt + 2 ELSE rgt END ',
381  $this->db->quote($right, 'integer'),
382  $this->db->quote($right, 'integer')
383  );
384  $res = $this->db->manipulate($query);
385  } else {
386  $query = sprintf(
387  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
388  'lft = CASE WHEN lft > %s THEN lft + 2 ELSE lft END, ' .
389  'rgt = CASE WHEN rgt >= %s THEN rgt + 2 ELSE rgt END ' .
390  'WHERE ' . $this->getTree()->getTreePk() . ' = %s',
391  $this->db->quote($right, 'integer'),
392  $this->db->quote($right, 'integer'),
393  $this->db->quote($this->getTree()->getTreeId(), 'integer')
394  );
395  $res = $this->db->manipulate($query);
396  }
397  }
398 
399  break;
400 
401  default:
402 
403  // get right value of preceeding child
404  $query = sprintf(
405  'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
406  'WHERE child = %s ' .
407  'AND ' . $this->getTree()->getTreePk() . ' = %s ',
408  $this->db->quote($a_pos, 'integer'),
409  $this->db->quote($this->getTree()->getTreeId(), 'integer')
410  );
411  $res = $this->db->query($query);
412  $r = $this->db->fetchObject($res);
413 
414  // crosscheck parents of sibling and new node (must be identical)
415  if ($r->parent != $a_parent_id) {
416  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR);
417  throw new ilInvalidTreeStructureException('Parent with id ' . $a_parent_id . ' not found in tree');
418  }
419 
420  $right = $r->rgt;
421  $lft = $right + 1;
422  $rgt = $right + 2;
423 
424  if ($this->getTree()->__isMainTree()) {
425  $query = sprintf(
426  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
427  'lft = CASE WHEN lft > %s THEN lft + 2 ELSE lft END, ' .
428  'rgt = CASE WHEN rgt > %s THEN rgt + 2 ELSE rgt END ',
429  $this->db->quote($right, 'integer'),
430  $this->db->quote($right, 'integer')
431  );
432  $res = $this->db->manipulate($query);
433  } else {
434  $query = sprintf(
435  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
436  'lft = CASE WHEN lft > %s THEN lft + 2 ELSE lft END, ' .
437  'rgt = CASE WHEN rgt > %s THEN rgt + 2 ELSE rgt END ' .
438  'WHERE ' . $this->getTree()->getTreePk() . ' = %s',
439  $this->db->quote($right, 'integer'),
440  $this->db->quote($right, 'integer'),
441  $this->db->quote($this->getTree()->getTreeId(), 'integer')
442  );
443  $res = $this->db->manipulate($query);
444  }
445 
446  break;
447  }
448 
449  // get depth
450  $depth = $this->getTree()->getDepth($a_parent_id) + 1;
451 
452  // insert node
453  $query = sprintf(
454  'INSERT INTO ' . $this->getTree()->getTreeTable() . ' (' . $this->getTree()->getTreePk() . ',child,parent,lft,rgt,depth) ' .
455  'VALUES (%s,%s,%s,%s,%s,%s)',
456  $this->db->quote($this->getTree()->getTreeId(), 'integer'),
457  $this->db->quote($a_node_id, 'integer'),
458  $this->db->quote($a_parent_id, 'integer'),
459  $this->db->quote($lft, 'integer'),
460  $this->db->quote($rgt, 'integer'),
461  $this->db->quote($depth, 'integer')
462  );
463  $res = $this->db->manipulate($query);
464  };
465 
466  if ($this->getTree()->__isMainTree()) {
467  $ilAtomQuery = $this->db->buildAtomQuery();
468  $ilAtomQuery->addTableLock('tree');
469  $ilAtomQuery->addQueryCallable($insert_node_callable);
470  $ilAtomQuery->run();
471  } else {
472  $insert_node_callable($this->db);
473  }
474  }
475 
479  public function deleteTree(int $a_node_id): void
480  {
481  $delete_tree_callable = function (ilDBInterface $db) use ($a_node_id): void {
482  // Fetch lft, rgt directly (without fetchNodeData) to avoid unnecessary table locks
483  // (object_reference, object_data)
484  $query = 'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
485  'WHERE child = ' . $this->db->quote($a_node_id, 'integer') . ' ' .
486  'AND ' . $this->getTree()->getTreePk() . ' = ' . $this->db->quote(
487  $this->getTree()->getTreeId(),
488  'integer'
489  );
490  $res = $this->db->query($query);
491  $node = $res->fetchRow(ilDBConstants::FETCHMODE_ASSOC);
492 
493  if($node === null) {
494  return; //Nothing to delete. $node does not exists
495  }
496 
497  // delete subtree
498  $query = sprintf(
499  'DELETE FROM ' . $this->getTree()->getTreeTable() . ' ' .
500  'WHERE lft BETWEEN %s AND %s ' .
501  'AND rgt BETWEEN %s AND %s ' .
502  'AND ' . $this->getTree()->getTreePk() . ' = %s',
503  $this->db->quote($node['lft'], 'integer'),
504  $this->db->quote($node['rgt'], 'integer'),
505  $this->db->quote($node['lft'], 'integer'),
506  $this->db->quote($node['rgt'], 'integer'),
507  $this->db->quote($node[$this->getTree()->getTreePk()], 'integer')
508  );
509  $res = $this->db->manipulate($query);
510 
511  // Performance improvement: We only close the gap, if the node
512  // is not in a trash tree, and if the resulting gap will be
513  // larger than twice the gap value
514 
515  $diff = $node["rgt"] - $node["lft"] + 1;
516  if (
517  $node[$this->getTree()->getTreePk()] >= 0 &&
518  $node['rgt'] - $node['lft'] >= $this->getTree()->getGap() * 2
519  ) {
520  if ($this->getTree()->__isMainTree()) {
521  $query = sprintf(
522  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
523  'lft = CASE WHEN lft > %s THEN lft - %s ELSE lft END, ' .
524  'rgt = CASE WHEN rgt > %s THEN rgt - %s ELSE rgt END ',
525  $this->db->quote($node['lft'], 'integer'),
526  $this->db->quote($diff, 'integer'),
527  $this->db->quote($node['lft'], 'integer'),
528  $this->db->quote($diff, 'integer')
529  );
530  $res = $this->db->manipulate($query);
531  } else {
532  $query = sprintf(
533  'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
534  'lft = CASE WHEN lft > %s THEN lft - %s ELSE lft END, ' .
535  'rgt = CASE WHEN rgt > %s THEN rgt - %s ELSE rgt END ' .
536  'WHERE ' . $this->getTree()->getTreePk() . ' = %s ',
537  $this->db->quote($node['lft'], 'integer'),
538  $this->db->quote($diff, 'integer'),
539  $this->db->quote($node['lft'], 'integer'),
540  $this->db->quote($diff, 'integer'),
541  $this->db->quote($node[$this->getTree()->getTreePk()], 'integer')
542  );
543  $res = $this->db->manipulate($query);
544  }
545  }
546  };
547 
548  // get lft and rgt values. Don't trust parameter lft/rgt values of $a_node
549  if ($this->getTree()->__isMainTree()) {
550  $ilAtomQuery = $this->db->buildAtomQuery();
551  $ilAtomQuery->addTableLock('tree');
552  $ilAtomQuery->addQueryCallable($delete_tree_callable);
553  $ilAtomQuery->run();
554  } else {
555  $delete_tree_callable($this->db);
556  }
557  }
558 
562  public function moveToTrash(int $a_node_id): void
563  {
564  $move_to_trash_callable = function (ilDBInterface $db) use ($a_node_id): void {
565  $node = $this->getTree()->getNodeTreeData($a_node_id);
566 
567  $query = 'UPDATE ' . $this->getTree()->getTreeTable() . ' ' .
568  'SET tree = ' . $this->db->quote(-1 * $node['child'], 'integer') . ' ' .
569  'WHERE ' . $this->getTree()->getTreePk() . ' = ' . $this->db->quote(
570  $this->getTree()->getTreeId(),
571  'integer'
572  ) . ' ' .
573  'AND lft BETWEEN ' . $this->db->quote(
574  $node['lft'],
575  'integer'
576  ) . ' AND ' . $this->db->quote($node['rgt'], 'integer') . ' ';
577 
578  $this->db->manipulate($query);
579  };
580 
581  // use ilAtomQuery to lock tables if tree is main tree
582  // otherwise just call this closure without locking
583  if ($this->getTree()->__isMainTree()) {
584  $ilAtomQuery = $this->db->buildAtomQuery();
585  $ilAtomQuery->addTableLock("tree");
586  $ilAtomQuery->addQueryCallable($move_to_trash_callable);
587  $ilAtomQuery->run();
588  } else {
589  $move_to_trash_callable($this->db);
590  }
591  }
592 
599  protected function getPathIdsUsingAdjacencyMap(int $a_endnode_id, int $a_startnode_id = 0): array
600  {
601  // The adjacency map algorithm is harder to implement than the nested sets algorithm.
602  // This algorithms performs an index search for each of the path element.
603  // This algorithms performs well for large trees which are not deeply nested.
604 
605  // The $takeId variable is used, to determine if a given id shall be included in the path
606  $takeId = $a_startnode_id == 0;
607 
608  $depth_cache = $this->getTree()->getDepthCache();
609  $parent_cache = $this->getTree()->getParentCache();
610 
611  if (
612  $this->getTree()->__isMainTree() &&
613  isset($depth_cache[$a_endnode_id]) &&
614  isset($parent_cache[$a_endnode_id])) {
615  $nodeDepth = $depth_cache[$a_endnode_id];
616  $parentId = $parent_cache[$a_endnode_id];
617  } else {
618  $nodeDepth = $this->getTree()->getDepth($a_endnode_id);
619  $parentId = $this->getTree()->getParentId($a_endnode_id);
620  }
621 
622  // Fetch the node ids. For shallow depths we can fill in the id's directly.
623  $pathIds = array();
624 
625  // backward compatible check for nodes not in tree
626  if (!$nodeDepth) {
627  return array();
628  } elseif ($nodeDepth == 1) {
629  $takeId = $takeId || $a_endnode_id == $a_startnode_id;
630  if ($takeId) {
631  $pathIds[] = $a_endnode_id;
632  }
633  } elseif ($nodeDepth == 2) {
634  $takeId = $takeId || $parentId == $a_startnode_id;
635  if ($takeId) {
636  $pathIds[] = $parentId;
637  }
638  $takeId = $takeId || $a_endnode_id == $a_startnode_id;
639  if ($takeId) {
640  $pathIds[] = $a_endnode_id;
641  }
642  } elseif ($nodeDepth == 3) {
643  $takeId = $takeId || $this->getTree()->getRootId() == $a_startnode_id;
644  if ($takeId) {
645  $pathIds[] = $this->getTree()->getRootId();
646  }
647  $takeId = $takeId || $parentId == $a_startnode_id;
648  if ($takeId) {
649  $pathIds[] = $parentId;
650  }
651  $takeId = $takeId || $a_endnode_id == $a_startnode_id;
652  if ($takeId) {
653  $pathIds[] = $a_endnode_id;
654  }
655  } elseif ($nodeDepth < 32) {
656  // Adjacency Map Tree performs better than
657  // Nested Sets Tree even for very deep trees.
658  // The following code construct nested self-joins
659  // Since we already know the root-id of the tree and
660  // we also know the id and parent id of the current node,
661  // we only need to perform $nodeDepth - 3 self-joins.
662  // We can further reduce the number of self-joins by 1
663  // by taking into account, that each row in table tree
664  // contains the id of itself and of its parent.
665  $qSelect = 't1.child c0';
666  $qJoin = '';
667  for ($i = 1; $i < $nodeDepth - 2; $i++) {
668  $qSelect .= ', t' . $i . '.parent c' . $i;
669  if ($this->getTree()->__isMainTree()) {
670  $qJoin .= ' JOIN ' . $this->getTree()->getTreeTable() . ' t' . $i . ' ON ' .
671  't' . $i . '.child=t' . ($i - 1) . '.parent ';
672  } else {
673  $qJoin .= ' JOIN ' . $this->getTree()->getTreeTable() . ' t' . $i . ' ON ' .
674  't' . $i . '.child=t' . ($i - 1) . '.parent AND ' .
675  't' . $i . '.' . $this->getTree()->getTreePk() . ' = ' . $this->getTree()->getTreeId();
676  }
677  }
678 
679  if ($this->getTree()->__isMainTree()) {
680  $types = array('integer');
681  $data = array($parentId);
682  $query = 'SELECT ' . $qSelect . ' ' .
683  'FROM ' . $this->getTree()->getTreeTable() . ' t0 ' . $qJoin . ' ' .
684  'WHERE t0.child = %s ';
685  } else {
686  $types = array('integer', 'integer');
687  $data = array($this->getTree()->getTreeId(), $parentId);
688  $query = 'SELECT ' . $qSelect . ' ' .
689  'FROM ' . $this->getTree()->getTreeTable() . ' t0 ' . $qJoin . ' ' .
690  'WHERE t0.' . $this->getTree()->getTreePk() . ' = %s ' .
691  'AND t0.child = %s ';
692  }
693 
694  $this->db->setLimit(1, 0);
695  $res = $this->db->queryF($query, $types, $data);
696 
697  if ($res->numRows() == 0) {
698  return array();
699  }
700 
701  $row = $this->db->fetchAssoc($res);
702 
703  $takeId = $takeId || $this->getTree()->getRootId() == $a_startnode_id;
704  if ($takeId) {
705  $pathIds[] = $this->getTree()->getRootId();
706  }
707  for ($i = $nodeDepth - 4; $i >= 0; $i--) {
708  $takeId = $takeId || $row['c' . $i] == $a_startnode_id;
709  if ($takeId) {
710  $pathIds[] = (int) $row['c' . $i];
711  }
712  }
713  $takeId = $takeId || $parentId == $a_startnode_id;
714  if ($takeId) {
715  $pathIds[] = $parentId;
716  }
717  $takeId = $takeId || $a_endnode_id == $a_startnode_id;
718  if ($takeId) {
719  $pathIds[] = $a_endnode_id;
720  }
721  } else {
722  // Fall back to nested sets tree for extremely deep tree structures
723  return $this->getPathIdsUsingNestedSets($a_endnode_id, $a_startnode_id);
724  }
725  return $pathIds;
726  }
727 
733  protected function getPathIdsUsingNestedSets(int $a_endnode_id, int $a_startnode_id = 0): array
734  {
735  // The nested sets algorithm is very easy to implement.
736  // Unfortunately it always does a full table space scan to retrieve the path
737  // regardless whether indices on lft and rgt are set or not.
738  // (At least, this is what happens on MySQL 4.1).
739  // This algorithms performs well for small trees which are deeply nested.
740 
741  if ($this->getTree()->__isMainTree()) {
742  $fields = array('integer');
743  $data = array($a_endnode_id);
744  $query = "SELECT T2.child " .
745  "FROM " . $this->getTree()->getTreeTable() . " T1, " . $this->getTree()->getTreeTable() . " T2 " .
746  "WHERE T1.child = %s " .
747  "AND T1.lft BETWEEN T2.lft AND T2.rgt " .
748  "ORDER BY T2.depth";
749  } else {
750  $fields = array('integer', 'integer', 'integer');
751  $data = array($a_endnode_id, $this->getTree()->getTreeId(), $this->getTree()->getTreeId());
752  $query = "SELECT T2.child " .
753  "FROM " . $this->getTree()->getTreeTable() . " T1, " . $this->getTree()->getTreeTable() . " T2 " .
754  "WHERE T1.child = %s " .
755  "AND T1.lft BETWEEN T2.lft AND T2.rgt " .
756  "AND T1." . $this->getTree()->getTreePk() . " = %s " .
757  "AND T2." . $this->getTree()->getTreePk() . " = %s " .
758  "ORDER BY T2.depth";
759  }
760 
761  $res = $this->db->queryF($query, $fields, $data);
762 
763  $takeId = $a_startnode_id == 0;
764  $pathIds = [];
765  while ($row = $this->db->fetchAssoc($res)) {
766  if ($takeId || $row['child'] == $a_startnode_id) {
767  $takeId = true;
768  $pathIds[] = (int) $row['child'];
769  }
770  }
771  return $pathIds;
772  }
773 
777  public function moveTree(int $a_source_id, int $a_target_id, int $a_position): void
778  {
779  $move_tree_callable = function (ilDBInterface $ilDB) use ($a_source_id, $a_target_id, $a_position): void {
780  // Receive node infos for source and target
781  $query = 'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
782  'WHERE ( child = %s OR child = %s ) ' .
783  'AND ' . $this->getTree()->getTreePk() . ' = %s ';
784  $res = $this->db->queryF($query, array('integer', 'integer', 'integer'), array(
785  $a_source_id,
786  $a_target_id,
787  $this->getTree()->getTreeId()
788  ));
789 
790  // Check in tree
791  if ($res->numRows() != 2) {
792  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR, 'Objects not found in tree');
793  throw new InvalidArgumentException('Error moving subtree');
794  }
795  $source_lft = $target_lft = $source_rgt = $target_rgt = $source_depth = $target_depth = $source_parent = 0;
796  while ($row = $this->db->fetchObject($res)) {
797  if ($row->child == $a_source_id) {
798  $source_lft = $row->lft;
799  $source_rgt = $row->rgt;
800  $source_depth = $row->depth;
801  $source_parent = $row->parent;
802  } else {
803  $target_lft = $row->lft;
804  $target_rgt = $row->rgt;
805  $target_depth = $row->depth;
806  }
807  }
808 
809  // Check target not child of source
810  if ($target_lft >= $source_lft && $target_rgt <= $source_rgt) {
811  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR, 'Target is child of source');
812  throw new InvalidArgumentException('Error moving subtree: target is child of source');
813  }
814 
815  // Now spread the tree at the target location. After this update the table should be still in a consistent state.
816  // implementation for ilTree::POS_LAST_NODE
817  $spread_diff = $source_rgt - $source_lft + 1;
818  #var_dump("<pre>","SPREAD_DIFF: ",$spread_diff,"<pre>");
819 
820  $query = 'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
821  'lft = CASE WHEN lft > %s THEN lft + %s ELSE lft END, ' .
822  'rgt = CASE WHEN rgt >= %s THEN rgt + %s ELSE rgt END ';
823 
824  if ($this->getTree()->__isMainTree()) {
825  $res = $this->db->manipulateF($query, array('integer', 'integer', 'integer', 'integer'), [
826  $target_rgt,
827  $spread_diff,
828  $target_rgt,
829  $spread_diff
830  ]);
831  } else {
832  $query .= ('WHERE ' . $this->getTree()->getTreePk() . ' = %s ');
833  $res = $this->db->manipulateF(
834  $query,
835  array('integer', 'integer', 'integer', 'integer', 'integer'),
836  array(
837  $target_rgt,
838  $spread_diff,
839  $target_rgt,
840  $spread_diff,
841  $this->getTree()->getTreeId()
842  )
843  );
844  }
845 
846  // Maybe the source node has been updated, too.
847  // Check this:
848  if ($source_lft > $target_rgt) {
849  $where_offset = $spread_diff;
850  $move_diff = $target_rgt - $source_lft - $spread_diff;
851  } else {
852  $where_offset = 0;
853  $move_diff = $target_rgt - $source_lft;
854  }
855  $depth_diff = $target_depth - $source_depth + 1;
856 
857  $query = 'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
858  'parent = CASE WHEN parent = %s THEN %s ELSE parent END, ' .
859  'rgt = rgt + %s, ' .
860  'lft = lft + %s, ' .
861  'depth = depth + %s ' .
862  'WHERE lft >= %s ' .
863  'AND rgt <= %s ';
864 
865  if ($this->getTree()->__isMainTree()) {
866  $res = $this->db->manipulateF(
867  $query,
868  array('integer', 'integer', 'integer', 'integer', 'integer', 'integer', 'integer'),
869  [
870  $source_parent,
871  $a_target_id,
872  $move_diff,
873  $move_diff,
874  $depth_diff,
875  $source_lft + $where_offset,
876  $source_rgt + $where_offset
877  ]
878  );
879  } else {
880  $query .= 'AND ' . $this->getTree()->getTreePk() . ' = %s ';
881  $res = $this->db->manipulateF(
882  $query,
883  array('integer', 'integer', 'integer', 'integer', 'integer', 'integer', 'integer', 'integer'),
884  array(
885  $source_parent,
886  $a_target_id,
887  $move_diff,
888  $move_diff,
889  $depth_diff,
890  $source_lft + $where_offset,
891  $source_rgt + $where_offset,
892  $this->getTree()->getTreeId()
893  )
894  );
895  }
896 
897  // done: close old gap
898  $query = 'UPDATE ' . $this->getTree()->getTreeTable() . ' SET ' .
899  'lft = CASE WHEN lft >= %s THEN lft - %s ELSE lft END, ' .
900  'rgt = CASE WHEN rgt >= %s THEN rgt - %s ELSE rgt END ';
901 
902  if ($this->getTree()->__isMainTree()) {
903  $res = $this->db->manipulateF($query, array('integer', 'integer', 'integer', 'integer'), [
904  $source_lft + $where_offset,
905  $spread_diff,
906  $source_rgt + $where_offset,
907  $spread_diff
908  ]);
909  } else {
910  $query .= ('WHERE ' . $this->getTree()->getTreePk() . ' = %s ');
911 
912  $res = $this->db->manipulateF(
913  $query,
914  array('integer', 'integer', 'integer', 'integer', 'integer'),
915  array(
916  $source_lft + $where_offset,
917  $spread_diff,
918  $source_rgt + $where_offset,
919  $spread_diff,
920  $this->getTree()->getTreeId()
921  )
922  );
923  }
924  };
925 
926  if ($this->getTree()->__isMainTree()) {
927  $ilAtomQuery = $this->db->buildAtomQuery();
928  $ilAtomQuery->addTableLock('tree');
929  $ilAtomQuery->addQueryCallable($move_tree_callable);
930  $ilAtomQuery->run();
931  } else {
932  $move_tree_callable($this->db);
933  }
934  }
935 
940  public function getSubtreeInfo(int $a_endnode_id): array
941  {
942  $query = "SELECT t2.lft lft, t2.rgt rgt, t2.child child, t2.parent parent, type " .
943  "FROM " . $this->getTree()->getTreeTable() . " t1 " .
944  "JOIN " . $this->getTree()->getTreeTable() . " t2 ON (t2.lft BETWEEN t1.lft AND t1.rgt) " .
945  "JOIN " . $this->getTree()->getTableReference() . " obr ON t2.child = obr.ref_id " .
946  "JOIN " . $this->getTree()->getObjectDataTable() . " obd ON obr.obj_id = obd.obj_id " .
947  "WHERE t1.child = " . $this->db->quote($a_endnode_id, 'integer') . " " .
948  "AND t1." . $this->getTree()->getTreePk() . " = " . $this->db->quote(
949  $this->getTree()->getTreeId(),
950  'integer'
951  ) . " " .
952  "AND t2." . $this->getTree()->getTreePk() . " = " . $this->db->quote(
953  $this->getTree()->getTreeId(),
954  'integer'
955  ) . " " .
956  "ORDER BY t2.lft";
957 
958  $res = $this->db->query($query);
959  $nodes = array();
960  while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
961  $nodes[(int) $row->child]['lft'] = (int) $row->lft;
962  $nodes[(int) $row->child]['rgt'] = (int) $row->rgt;
963  $nodes[(int) $row->child]['child'] = (int) $row->child;
964  $nodes[(int) $row->child]['parent'] = (int) $row->parent;
965  $nodes[(int) $row->child]['type'] = (string) $row->type;
966  }
967  return $nodes;
968  }
969 
975  public function validateParentRelations(): array
976  {
977  $query = 'select ' . $this->getTree()->getTreePk() .', child from ' . $this->getTree()->getTreeTable() . ' child where not exists ' .
978  '( ' .
979  'select child from ' . $this->getTree()->getTreeTable() . ' parent where child.parent = parent.child and (parent.lft < child.lft) and (parent.rgt > child.rgt) ' .
980  ')' .
981  'and ' . $this->getTree()->getTreePk() . ' = ' . $this->getTree()->getTreeId() . ' and child <> 1';
982  $res = $this->db->query($query);
983 
984  $failures = array();
985  while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_ASSOC)) {
986  $failures[] = $row[$this->getTree()->getTreePk()];
987  }
988  return $failures;
989  }
990 
995  public function getChildSequenceNumber(array $a_node, string $type = ""): int
996  {
997  if (!isset($a_node)) {
998  $message = "No node_id given!";
999  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR);
1000  throw new InvalidArgumentException($message);
1001  }
1002 
1003  if ($type) {
1004  $query = 'SELECT count(*) cnt FROM ' . $this->getTree()->getTreeTable() . ' ' .
1005  $this->getTree()->buildJoin() .
1006  'WHERE lft <= %s ' .
1007  'AND type = %s ' .
1008  'AND parent = %s ' .
1009  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ';
1010 
1011  $res = $this->db->queryF($query, array('integer', 'text', 'integer', 'integer'), array(
1012  $a_node['lft'],
1013  $type,
1014  $a_node['parent'],
1015  $this->getTree()->getTreeId()
1016  ));
1017  } else {
1018  $query = 'SELECT count(*) cnt FROM ' . $this->getTree()->getTreeTable() . ' ' .
1019  $this->getTree()->buildJoin() .
1020  'WHERE lft <= %s ' .
1021  'AND parent = %s ' .
1022  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ';
1023 
1024  $res = $this->db->queryF($query, array('integer', 'integer', 'integer'), array(
1025  $a_node['lft'],
1026  $a_node['parent'],
1027  $this->getTree()->getTreeId()
1028  ));
1029  }
1030  $row = $this->db->fetchAssoc($res);
1031  return (int) $row["cnt"];
1032  }
1033 
1039  public function fetchSuccessorNode(int $a_node_id, string $a_type = ""): ?array
1040  {
1041  // get lft value for current node
1042  $query = 'SELECT lft FROM ' . $this->getTree()->getTreeTable() . ' ' .
1043  'WHERE ' . $this->getTree()->getTreeTable() . '.child = %s ' .
1044  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ';
1045  $res = $this->db->queryF($query, array('integer', 'integer'), array(
1046  $a_node_id,
1047  $this->getTree()->getTreeId()
1048  ));
1049  $curr_node = $this->db->fetchAssoc($res);
1050 
1051  if ($a_type) {
1052  $query = 'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
1053  $this->getTree()->buildJoin() .
1054  'WHERE lft > %s ' .
1055  'AND ' . $this->getTree()->getObjectDataTable() . '.type = %s ' .
1056  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ' .
1057  'ORDER BY lft ';
1058  $this->db->setLimit(1, 0);
1059  $res = $this->db->queryF($query, array('integer', 'text', 'integer'), array(
1060  $curr_node['lft'],
1061  $a_type,
1062  $this->getTree()->getTreeId()
1063  ));
1064  } else {
1065  $query = 'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
1066  $this->getTree()->buildJoin() .
1067  'WHERE lft > %s ' .
1068  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ' .
1069  'ORDER BY lft ';
1070  $this->db->setLimit(1, 0);
1071  $res = $this->db->queryF($query, array('integer', 'integer'), array(
1072  $curr_node['lft'],
1073  $this->getTree()->getTreeId()
1074  ));
1075  }
1076 
1077  if ($res->numRows() < 1) {
1078  return null;
1079  } else {
1080  $row = $this->db->fetchAssoc($res);
1081  return $this->getTree()->fetchNodeData($row);
1082  }
1083  }
1084 
1090  public function fetchPredecessorNode(int $a_node_id, string $a_type = ""): ?array
1091  {
1092  if (!isset($a_node_id)) {
1093  $message = "No node_id given!";
1094  ilLoggerFactory::getLogger('tree')->logStack(ilLogLevel::ERROR);
1095  throw new InvalidArgumentException($message);
1096  }
1097 
1098  // get lft value for current node
1099  $query = 'SELECT lft FROM ' . $this->getTree()->getTreeTable() . ' ' .
1100  'WHERE ' . $this->getTree()->getTreeTable() . '.child = %s ' .
1101  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ';
1102  $res = $this->db->queryF($query, array('integer', 'integer'), array(
1103  $a_node_id,
1104  $this->getTree()->getTreeId()
1105  ));
1106 
1107  $curr_node = $this->db->fetchAssoc($res);
1108 
1109  if ($a_type) {
1110  $query = 'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
1111  $this->getTree()->buildJoin() .
1112  'WHERE lft < %s ' .
1113  'AND ' . $this->getTree()->getObjectDataTable(). '.type = %s ' .
1114  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ' .
1115  'ORDER BY lft DESC';
1116  $this->db->setLimit(1, 0);
1117  $res = $this->db->queryF($query, array('integer', 'text', 'integer'), array(
1118  $curr_node['lft'],
1119  $a_type,
1120  $this->getTree()->getTreeId()
1121  ));
1122  } else {
1123  $query = 'SELECT * FROM ' . $this->getTree()->getTreeTable() . ' ' .
1124  $this->getTree()->buildJoin() .
1125  'WHERE lft < %s ' .
1126  'AND ' . $this->getTree()->getTreeTable() . '.' . $this->getTree()->getTreePk() . ' = %s ' .
1127  'ORDER BY lft DESC';
1128  $this->db->setLimit(1, 0);
1129  $res = $this->db->queryF($query, array('integer', 'integer'), array(
1130  $curr_node['lft'],
1131  $this->getTree()->getTreeId()
1132  ));
1133  }
1134 
1135  if ($res->numRows() < 1) {
1136  return null;
1137  } else {
1138  $row = $this->db->fetchAssoc($res);
1139  return $this->getTree()->fetchNodeData($row);
1140  }
1141  }
1142 }
ilInvalidTreeStructureException
Thrown if invalid tree strucutes are found.
Definition: class.ilInvalidTreeStructureException.php:11
ilNestedSetTree\insertNode
insertNode(int $a_node_id, int $a_parent_id, int $a_pos)
Definition: class.ilNestedSetTree.php:200
$res
$res
Definition: ltiservices.php:69
ilNestedSetTree\getSubTreeQuery
getSubTreeQuery(array $a_node, array $a_types=[], bool $a_force_join_reference=true, array $a_fields=[])
Get subtree.
Definition: class.ilNestedSetTree.php:122
ilLoggerFactory\getLogger
static getLogger(string $a_component_id)
Get component logger.
Definition: class.ilLoggerFactory.php:90
ilNestedSetTree\fetchPredecessorNode
fetchPredecessorNode(int $a_node_id, string $a_type="")
get node data of predecessor node
Definition: class.ilNestedSetTree.php:1090
ilNestedSetTree\fetchSuccessorNode
fetchSuccessorNode(int $a_node_id, string $a_type="")
get node data of successor node
Definition: class.ilNestedSetTree.php:1039
ilTree\RELATION_PARENT
const RELATION_PARENT
Definition: class.ilTree.php:38
ilNestedSetTree
Base class for nested set path based trees.
Definition: class.ilNestedSetTree.php:27
ilNestedSetTree\getSubTreeIds
getSubTreeIds(int $a_node_id)
Get subtree ids int[].
Definition: class.ilNestedSetTree.php:52
ilTree\POS_FIRST_NODE
const POS_FIRST_NODE
Definition: class.ilTree.php:35
ilNestedSetTree\getPathIds
getPathIds(int $a_endnode, int $a_startnode=0)
Get path ids from a startnode to a given endnode.
Definition: class.ilNestedSetTree.php:192
ilNestedSetTree\getRelation
getRelation(array $a_node_a, array $a_node_b)
Get relation of two nodes.
Definition: class.ilNestedSetTree.php:170
ilNestedSetTree\__construct
__construct(ilTree $a_tree)
Constructor.
Definition: class.ilNestedSetTree.php:35
$DIC
global $DIC
Definition: shib_login.php:25
ilTree\RELATION_EQUALS
const RELATION_EQUALS
Definition: class.ilTree.php:40
ilTree\RELATION_CHILD
const RELATION_CHILD
Definition: class.ilTree.php:37
ilTree\RELATION_NONE
const RELATION_NONE
Definition: class.ilTree.php:41
ilNestedSetTree\deleteTree
deleteTree(int $a_node_id)
Delete tree.
Definition: class.ilNestedSetTree.php:479
ilTree\POS_LAST_NODE
const POS_LAST_NODE
Definition: class.ilTree.php:34
ilNestedSetTree\moveTree
moveTree(int $a_source_id, int $a_target_id, int $a_position)
Move a source subtree to target.
Definition: class.ilNestedSetTree.php:777
ilNestedSetTree\getSubtreeInfo
getSubtreeInfo(int $a_endnode_id)
Definition: class.ilNestedSetTree.php:940
ilNestedSetTree\getTrashSubTreeQuery
getTrashSubTreeQuery(array $a_node, array $a_types, bool $a_force_join_reference=true, array $a_fields=[])
Get subtree query for trashed tree items.
Definition: class.ilNestedSetTree.php:77
ilTree\RELATION_SIBLING
const RELATION_SIBLING
Definition: class.ilTree.php:39
ilNestedSetTree\validateParentRelations
validateParentRelations()
Validate the parent relations of the tree implementation For nested set, validate the lft...
Definition: class.ilNestedSetTree.php:975
ilNestedSetTree\getPathIdsUsingNestedSets
getPathIdsUsingNestedSets(int $a_endnode_id, int $a_startnode_id=0)
get path from a given startnode to a given endnode if startnode is not given the rootnode is startnod...
Definition: class.ilNestedSetTree.php:733
ilTreeImplementation
Interface for tree implementations Currrently nested set or materialized path.
Definition: interface.ilTreeImplementation.php:12
ilNestedSetTree\moveToTrash
moveToTrash(int $a_node_id)
Move subtree to trash.
Definition: class.ilNestedSetTree.php:562
ilNestedSetTree\getChildSequenceNumber
getChildSequenceNumber(array $a_node, string $type="")
get sequence number of node in sibling sequence
Definition: class.ilNestedSetTree.php:995
ilNestedSetTree\getPathIdsUsingAdjacencyMap
getPathIdsUsingAdjacencyMap(int $a_endnode_id, int $a_startnode_id=0)
get path from a given startnode to a given endnode if startnode is not given the rootnode is startnod...
Definition: class.ilNestedSetTree.php:599
$r
$r
Definition: shib_logout.php:137