class.ilSCTreeTasks.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilSCTreeTasks
{
        private $db = null;
        private $task = null;
        
        public function __construct(ilSCTask $task)
        {
                $this->db = $GLOBALS['ilDB'];
                $this->task = $task;
        }
        
        
        public static function findDeepestDuplicate()
        {
                global $ilDB;
                
                $query = 'SELECT child FROM tree first  '.
                                'WHERE EXISTS ( '.
                                'SELECT child FROM tree second WHERE first.child = second.child '.
                                'GROUP BY child HAVING COUNT(child)  >  1 ) '.
                                'ORDER BY depth DESC';
                
                $GLOBALS['ilLog']->write($query);
                
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        return $row->child;
                }
                return 0;
        }
        
        public static function repairPK()
        {
                #$GLOBALS['ilDB']->dropPrimaryKey('tree');
                $GLOBALS['ilDB']->addPrimaryKey('tree', array('child'));
        }
        
        public static function getNodeInfo($a_tree_id, $a_child)
        {
                global $ilDB;
                
                $query = 'SELECT * FROM tree WHERE child = '.$ilDB->quote($a_child,'integer').' AND tree = '. $ilDB->quote($a_tree_id,'integer');
                $res = $ilDB->query($query);

                $node = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $node['child'] = $row->child;
                        $node['tree'] = $row->tree;
                        $node['depth'] = $row->depth;
                        
                        // read obj_id
                        $query = 'SELECT obj_id FROM object_reference WHERE ref_id = '.$ilDB->quote($a_child,'integer');
                        $ref_res = $ilDB->query($query);
                        while($ref_row = $ref_res->fetchRow(DB_FETCHMODE_OBJECT))
                        {
                                $node['obj_id'] = $ref_row->obj_id;
                                
                                // read object info
                                $query = 'SELECT title, description, type FROM object_data '.
                                                'WHERE obj_id = '.$ilDB->quote($ref_row->obj_id);
                                $obj_res = $ilDB->query($query);
                                while($obj_row = $obj_res->fetchRow(DB_FETCHMODE_OBJECT))
                                {
                                        $node['title'] = $obj_row->title;
                                        $node['description'] = $obj_row->description;
                                        $node['type'] = $obj_row->type;
                                }
                        }
                }
                return $node;
        }
        
        public static function getChilds($a_tree_id, $a_childs)
        {
                global $ilDB;
                
                $query = 'SELECT * FROM tree WHERE tree = '.$ilDB->quote($a_tree_id,'integer').' '.'AND child = '.$ilDB->quote($a_childs,'integer');
                $res = $ilDB->query($query);
                
                $childs = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $childs[] = $row->child;
                }
                return $childs;
        }
        
        public static function findDuplicates($a_duplicate_id)
        {
                global $ilDB;
                
                $query = 'SELECT * FROM tree first  '.
                                'WHERE EXISTS ( '.
                                'SELECT child FROM tree second WHERE first.child = second.child '.
                                'GROUP BY child HAVING COUNT(child)  >  1 ) '.
                                'AND child = '.$ilDB->quote($a_duplicate_id,'integer').' '.
                                'ORDER BY depth DESC';
                $res = $ilDB->query($query);
                
                $GLOBALS['ilLog']->write($query);
                
                $nodes = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $node = array();
                        $node['tree'] = $row->tree;
                        $node['child'] = $row->child;
                        $node['depth'] = $row->depth;
                        
                        $nodes[] = $node;
                }
                
                return $nodes;
        }
        
        public static function hasDuplicate($a_child)
        {
                global $ilDB;
                
                return count(self::findDuplicates($a_child));
        }
        
        public static function deleteDuplicateFromTree($a_duplicate_id, $a_delete_trash)
        {
                $dups = self::findDuplicates($a_duplicate_id);
                foreach($dups as $dup)
                {
                        if($a_delete_trash and $dup['tree'] < 1)
                        {
                                self::deleteDuplicate($dup['tree'],$dup['child']);
                        }
                        if(!$a_delete_trash and $dup['tree'] == 1)
                        {
                                self::deleteDuplicate($dup['tree'],$dup['child']);
                        }
                }
                return TRUE;
        }
        
        protected static function deleteDuplicate($tree_id, $dup_id)
        {
                global $ilDB;
                
                $query = 'SELECT child FROM tree '.
                                'WHERE parent = '.$ilDB->quote($dup_id,'integer').' '.
                                'AND tree = '.$ilDB->quote($tree_id,'integer');
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        // start recursion
                        self::deleteDuplicate($tree_id, $row->child);
                }
                // now delete node
                if(self::hasDuplicate($dup_id))
                {
                        $query = 'DELETE FROM tree '.
                                        'WHERE child = '.$ilDB->quote($dup_id,'integer').' '.
                                        'AND tree = '.$ilDB->quote($tree_id,'integer');
                        $ilDB->manipulate($query);
                }
        }


        public function getDB()
        {
                return $this->db;
        }
        
        public function getTask()
        {
                return $this->task;
        }
        
        
        
        public function validateStructure()
        {
                $failures = $this->checkStructure();
                
                if(count($failures))
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
                }
                else
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
                }
                $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
                $this->getTask()->update();
                return count($failures);
        }
        
        
        public function checkStructure()
        {
                return $GLOBALS['tree']->validateParentRelations();
                global $ilDB;
                
                $query = 'select child from tree child where not exists '.
                                '( '.
                                'select child from tree parent where child.parent = parent.child and (parent.lft < child.lft) and (parent.rgt > child.rgt) '.
                                ')'.
                                'and tree = 1 and child <> 1';
                $res = $ilDB->query($query);
                
                $failures = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $failures[] = $row->child;
                }
                return $failures;
        }
        
        
        
        public function validateDuplicates()
        {
                $failures = $this->checkDuplicates();
                
                if(count($failures))
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
                }
                else
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
                }
                $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
                $this->getTask()->update();
                return count($failures);
        }
        
        public function checkDuplicates()
        {
                $query = 'SELECT child, count(child) num FROM tree '.
                                'GROUP BY child '.
                                'HAVING count(child) > 1';
                $res = $this->getDB()->query($query);
                
                $GLOBALS['ilLog']->write($query);
                
                $failures = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $failures[] = $row->child;
                }
                return $failures;
        }
        
        public function findMissingTreeEntries()
        {
                global $ilDB;
                
                $failures = $this->readMissingTreeEntries();
                
                if(count($failures))
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
                }
                else
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
                }
                
                $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
                $this->getTask()->update();
                return count($failures);
        }
        
        
        public function findMissing()
        {
                global $ilDB;
                
                $failures = $this->readMissing();
                
                if(count($failures))
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_FAILED);
                }
                else
                {
                        $this->getTask()->setStatus(ilSCTask::STATUS_COMPLETED);
                }
                
                $this->getTask()->setLastUpdate(new ilDateTime(time(),IL_CAL_UNIX));
                $this->getTask()->update();
                return count($failures);
                
        }
        
        public function repairMissing()
        {
                $failures = $this->readMissing();
                $recf_ref_id = $this->createRecoveryContainer();
                foreach($failures as $ref_id)
                {
                        $this->repairMissingObject($recf_ref_id,$ref_id);
                }
                
        }
        
        protected function repairMissingObject($a_parent_ref, $a_ref_id)
        {
                global $ilDB;
                
                // check if object entry exist
                $query = 'SELECT obj_id FROM object_reference '.
                                'WHERE ref_id = '.$ilDB->quote($a_ref_id,'integer');
                
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $query = 'SELECT type, title FROM object_data '.
                                        'WHERE obj_id = '.$ilDB->quote($row->obj_id,'integer');
                        $ores = $ilDB->query($query);
                        
                        $done = FALSE;
                        while($orow = $ores->fetchRow(DB_FETCHMODE_OBJECT))
                        {
                                $GLOBALS['ilLog']->write(__METHOD__.': Moving to recovery folder: '.$orow->type.': '.$orow->title);
                                $done = TRUE;
                                
                                include_once './Services/Object/classes/class.ilObjectFactory.php';
                                $factory = new ilObjectFactory();
                                $ref_obj = $factory->getInstanceByRefId($a_ref_id,FALSE);
                                
                                if($ref_obj instanceof ilObjRoleFolder) 
                                {
                                        $ref_obj->delete();
                                }
                                elseif($ref_obj instanceof ilObject)
                                {
                                        $ref_obj->putInTree($a_parent_ref);
                                        $ref_obj->setPermissions($a_parent_ref);
                                        $GLOBALS['ilLog']->write(__METHOD__.': Moving finished');
                                        break;
                                }
                        }
                        if(!$done)
                        {
                                // delete reference value
                                $query = 'DELETE FROM object_reference WHERE ref_id = '.$ilDB->quote($a_ref_id,'integer');
                                $ilDB->manipulate($query);
                                $GLOBALS['ilLog']->write(__METHOD__.': Delete reference for "object" without tree and object_data entry: ref_id= '.$a_ref_id );
                        }
                }
                
        }

        protected function readMissing()
        {
                global $ilDB;
                
                $query = 'SELECT ref_id FROM object_reference '.
                                'LEFT JOIN tree ON ref_id = child '.
                                'WHERE child IS NULL';
                $res = $ilDB->query($query);
                
                $failures = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $failures[] = $row->ref_id;
                }
                return $failures;
        }
        
        public function repairMissingTreeEntries()
        {
                global $ilDB;
                
                $missing = $this->readMissingTreeEntries();
                $GLOBALS['ilLog']->write(__METHOD__.': '.print_r($missing,TRUE));
                
                foreach($missing as $ref_id)
                {
                        // check for duplicates
                        $query = 'SELECT tree, child FROM tree '.
                                        'WHERE child = '.$ilDB->quote($ref_id);
                        $res = $ilDB->query($query);
                        while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                        {
                                $GLOBALS['ilLog']->write(__METHOD__.': '.$row->tree.': '.$ref_id);
                                
                                $this->deleteMissingTreeEntry($row->tree,$ref_id);
                        }
                }
        }
        
        protected function deleteMissingTreeEntry($a_tree_id,$a_ref_id)
        {
                global $ilDB;
                
                $query = 'SELECT child FROM tree '.
                                'WHERE parent = '.$ilDB->quote($a_ref_id,'integer').' '.
                                'AND tree = '.$ilDB->quote($a_tree_id,'integer');

                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        // check for duplicates
                        $query = 'SELECT tree, child FROM tree '.
                                        'WHERE child = '.$ilDB->quote($row->child);
                        $resd = $ilDB->query($query);
                        while($rowd = $resd->fetchRow(DB_FETCHMODE_OBJECT))
                        {
                                $this->deleteMissingTreeEntry($rowd->tree,$rowd->child);
                        }
                }
                
                // finally delete
                include_once './Services/Object/classes/class.ilObjectFactory.php';
                $factory = new ilObjectFactory();
                $ref_obj = $factory->getInstanceByRefId($a_ref_id,FALSE);
                                
                if(($ref_obj instanceof ilObject) and $ref_obj->getType())
                {
                        $ref_obj->delete();
                }
                
                $query = 'DELETE from tree '.
                                'WHERE tree = '.$ilDB->quote($a_tree_id).' '.
                                'AND child = '.$ilDB->quote($a_ref_id);
                $ilDB->manipulate($query);
        }
        
        
        protected function readMissingTreeEntries()
        {
                global $ilDB;
                
                $query = 'SELECT child FROM tree '.
                                'LEFT JOIN object_reference ON child = ref_id '.
                                'WHERE ref_id IS NULL';
                
                $res = $ilDB->query($query);
                
                $failures = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $failures[] = $row->child;
                }
                return $failures;
        }
        
        
        protected function createRecoveryContainer()
        {
                $now = new ilDateTime(time(),IL_CAL_UNIX);
                
                include_once './Modules/Folder/classes/class.ilObjFolder.php';
                $folder = new ilObjFolder();
                $folder->setTitle('__System check recovery: '.$now->get(IL_CAL_DATETIME));
                $folder->create();
                $folder->createReference();
                $folder->putInTree(RECOVERY_FOLDER_ID);
                
                return $folder->getRefId();
        }
        
        
        
        
}
?>