class.ilObjectLP.php

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<?php

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

include_once "Services/Tracking/classes/class.ilLPObjSettings.php";

class ilObjectLP
{       
        protected $obj_id; // [int]
        protected $collection_instance; // [ilLPCollection]
        protected $mode; // [int]
        
        protected function __construct($a_obj_id)
        {               
                $this->obj_id = (int)$a_obj_id;
        }
        
        public static function getInstance($a_obj_id)
        {               
                static $instances = array();
                
                if(!isset($instances[$a_obj_id]))
                {               
                        $type = ilObject::_lookupType($a_obj_id);
                        $class = self::getTypeClass($type);
                        if($class)
                        {
                                $instance = new $class($a_obj_id);
                        }
                        else 
                        {
                                // :TODO: should we return anything?
                                $instance = new self($a_obj_id);                        
                        }                       
                        $instances[$a_obj_id] = $instance;                                      
                }
        
                return $instances[$a_obj_id];
        }
                        
        protected static function getTypeClass($a_type)
        {
                global $objDefinition;
                
                if(self::isSupportedObjectType($a_type))
                {
                        switch($a_type)
                        {
                                // container

                                case "crs":
                                        include_once "Modules/Course/classes/class.ilCourseLP.php";
                                        return "ilCourseLP";    

                                case "grp":
                                        include_once "Modules/Group/classes/class.ilGroupLP.php";
                                        return "ilGroupLP";

                                case "fold":
                                        include_once "Modules/Folder/classes/class.ilFolderLP.php";
                                        return "ilFolderLP";


                                // learning resources

                                case "lm":
                                        include_once "Modules/LearningModule/classes/class.ilLearningModuleLP.php";
                                        return "ilLearningModuleLP";

                                case "htlm":
                                        include_once "Modules/HTMLLearningModule/classes/class.ilHTMLLearningModuleLP.php";
                                        return "ilHTMLLearningModuleLP";

                                case "sahs":
                                        include_once "Modules/ScormAicc/classes/class.ilScormLP.php";
                                        return "ilScormLP";
                                        

                                // misc

                                case "tst":
                                        include_once "Modules/Test/classes/class.ilTestLP.php";
                                        return "ilTestLP";

                                case "exc":
                                        include_once "Modules/Exercise/classes/class.ilExerciseLP.php";
                                        return "ilExerciseLP";
                                        
                                case 'file':
                                        require_once 'Modules/File/classes/class.ilFileLP.php';
                                        return 'ilFileLP';
                                        
                                case "mcst":
                                        require_once "Modules/MediaCast/classes/class.ilMediaCastLP.php";
                                        return "ilMediaCastLP";
                        
                                case "sess":
                                        include_once "Modules/Session/classes/class.ilSessionLP.php";
                                        return  "ilSessionLP";          
                                        
                                case "svy":
                                        include_once "Modules/Survey/classes/class.ilSurveyLP.php";
                                        return  "ilSurveyLP";           

                                case "prg":
                                        include_once "Modules/StudyProgramme/classes/class.ilStudyProgrammeLP.php";
                                        return "ilStudyProgrammeLP";

                                // plugin
                                case $objDefinition->isPluginTypeName($a_type):
                                        include_once "Services/Component/classes/class.ilPluginLP.php";
                                        return "ilPluginLP";
                        }
                }
        }
                
        public static function isSupportedObjectType($a_type)
        {
                global $objDefinition;
                
                $valid = array("crs", "grp", "fold", "lm", "htlm", "sahs", "tst", "exc", "sess", "svy", "file", "mcst", "prg");
                
                if(in_array($a_type, $valid))
                {
                        return true;                    
                }
                
                if($objDefinition->isPluginTypeName($a_type))
                {
                        include_once 'Services/Repository/classes/class.ilRepositoryObjectPluginSlot.php';      
                        return ilRepositoryObjectPluginSlot::isTypePluginWithLP($a_type);
                }
                
                return false;
        }       
                
        public function resetCaches()
        {
                $this->mode = null;
                $this->collection_instance = null;
        }
        
        public function isAnonymized()
        {
                // see ilLPCollectionOfRepositoryObjects::validateEntry()
                return false;
        }
        
        
        //
        // MODE
        // 
        
        public function getDefaultMode()
        {
                return ilLPObjSettings::LP_MODE_UNDEFINED;
        }
        
        public function getValidModes()
        {
                return array();
        }       
        
        public function getCurrentMode()
        {               
                if($this->mode === null)
                {                               
                        $mode = ilLPObjSettings::_lookupDBMode($this->obj_id);          
                        if($mode === null)
                        {
                                $mode = $this->getDefaultMode();
                        }               
                        $this->mode = (int)$mode;
                }
                
                return $this->mode;
        }
        
        public function isActive()
        {
                // :TODO: check LP activation?
                
                $mode = $this->getCurrentMode();
                if($mode == ilLPObjSettings::LP_MODE_DEACTIVATED || 
                        $mode == ilLPObjSettings::LP_MODE_UNDEFINED)
                {
                        return false;
                }
                return true;
        }
        
        public function getModeText($a_mode)
        {               
                return ilLPObjSettings::_mode2Text($a_mode);            
        }
        
        public function getModeInfoText($a_mode)
        {
                return ilLPObjSettings::_mode2InfoText($a_mode);                
        }
        
        public function getSettingsInfo()
        {
                // type-specific                
        }
        
        
        //
        // COLLECTION
        // 
                
        public function getCollectionInstance()
        {                                               
                if($this->collection_instance === null)
                {               
                        include_once "Services/Tracking/classes/collection/class.ilLPCollection.php";                   
                        $this->collection_instance = ilLPCollection::getInstanceByMode($this->obj_id, $this->getCurrentMode());
                }
                
                return $this->collection_instance;              
        }
                        
        
        //
        // MEMBERS
        // 
        
        public function getMembers($a_search = true)
        {               
                global $tree;
                
                if(!$a_search)
                {
                        return;
                }
                
                $ref_ids = ilObject::_getAllReferences($this->obj_id);
                $ref_id = current($ref_ids);
                
                // walk path to find parent with specific members 
                $path = $tree->getPathId($ref_id);
                array_pop($path);
                foreach(array_reverse($path) as $path_ref_id)
                {
                        $olp = self::getInstance(ilObject::_lookupObjId($path_ref_id));
                        $all = $olp->getMembers(false);
                        if(is_array($all))
                        {
                                return $all;
                        }
                }               
        }
        
        
        //
        // RESET
        //
        
        final public function resetLPDataForCompleteObject($a_recursive = true)
        {                               
                $user_ids = $this->gatherLPUsers();
                if(sizeof($user_ids))
                {
                        $this->resetLPDataForUserIds(array_unique($user_ids), $a_recursive);
                }               
        }
        
        final public function resetLPDataForUserIds(array $a_user_ids, $a_recursive = true)
        {                               
                if((bool)$a_recursive && 
                        method_exists($this, "getPossibleCollectionItems")) // #15203
                {
                        $subitems = $this->getPossibleCollectionItems();
                        if(is_array($subitems))
                        {
                                foreach($subitems as $sub_ref_id)
                                {
                                        $olp = self::getInstance(ilObject::_lookupObjId($sub_ref_id));
                                        $olp->resetLPDataForUserIds($a_user_ids, false);
                                }
                        }
                }
                
                $this->resetCustomLPDataForUserIds($a_user_ids, (bool)$a_recursive);
                                                
                include_once "Services/Tracking/classes/class.ilLPMarks.php";
                ilLPMarks::_deleteForUsers($this->obj_id, $a_user_ids);

                include_once "Services/Tracking/classes/class.ilChangeEvent.php";
                ilChangeEvent::_deleteReadEventsForUsers($this->obj_id, $a_user_ids);           
                                
                // update LP status to get collections up-to-date
                include_once "Services/Tracking/classes/class.ilLPStatusWrapper.php";   
                foreach($a_user_ids as $user_id)
                {
                        ilLPStatusWrapper::_updateStatus($this->obj_id, $user_id);
                }
        }
                
        protected function resetCustomLPDataForUserIds(array $a_user_ids, $a_recursive = true)
        {
                // this should delete all data that is relevant for the supported LP modes
        }
        
        protected function gatherLPUsers()
        {
                include_once "Services/Tracking/classes/class.ilLPMarks.php";
                $user_ids = ilLPMarks::_getAllUserIds($this->obj_id);
                
                include_once "Services/Tracking/classes/class.ilChangeEvent.php";
                $user_ids = array_merge($user_ids, ilChangeEvent::_getAllUserIds($this->obj_id));               
                
                return $user_ids;
        }
        
        
        //
        // EVENTS
        // 
                
        final static public function handleMove($a_source_ref_id)
        {       
                global $tree, $ilDB;
                
                $ref_ids = $tree->getSubTreeIds($a_source_ref_id);
                $ref_ids[] = $a_source_ref_id;
                
                // get "parent" path to source node (not including source node)
                $new_path = $tree->getPathId($a_source_ref_id);
                array_pop($new_path);
                $new_path = implode("/", $new_path);
        
                include_once("./Services/Tracking/classes/class.ilLPStatusWrapper.php");
                
                // find collections with ref_ids                
                $set = $ilDB->query("SELECT DISTINCT(ut_lp_collections.obj_id) obj_id".
                        " FROM object_reference".
                        " JOIN ut_lp_collections ON".
                        " (".$ilDB->in("object_reference.ref_id", $ref_ids, "", "integer").
                        " AND object_reference.ref_id = ut_lp_collections.item_id)");
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        if (in_array(ilObject::_lookupType($rec["obj_id"]), array("crs", "grp", "fold")))
                        {
                                $coll_ref_id = ilObject::_getAllReferences($rec["obj_id"]);
                                $coll_ref_id = array_pop($coll_ref_id);
                                
                                // #13402
                                if($coll_ref_id == $a_source_ref_id)
                                {
                                        continue;
                                }
                                
                                // #17703 - collection has also been moved - nothing todo
                                if($tree->isGrandChild($a_source_ref_id, $coll_ref_id))
                                {
                                        continue;
                                }
                                
                                // get path to collection (including collection "parent")
                                $coll_path = $tree->getPathId($coll_ref_id);
                                $coll_path = implode("/", $coll_path);
                                
                                // collection path is not inside new path
                                if(!stristr($new_path, $coll_path))
                                {
                                        // delete all items of moved (sub-)tree
                                        $query = "DELETE FROM ut_lp_collections".
                                                " WHERE obj_id = ".$ilDB->quote($rec["obj_id"], "integer").
                                                " AND ".$ilDB->in("item_id", $ref_ids, "", "integer");
                                        $ilDB->manipulate($query);
                                        
                                        ilLPStatusWrapper::_refreshStatus($rec["obj_id"]);                      
                                }
                        }
                }               
        }
        
        final public function handleToTrash()
        {                       
                $this->updateParentCollections();               
        }
        
        final public function handleDelete()
        {                               
                include_once "Services/Tracking/classes/class.ilLPMarks.php";
                ilLPMarks::deleteObject($this->obj_id);

                include_once "Services/Tracking/classes/class.ilChangeEvent.php";
                ilChangeEvent::_delete($this->obj_id);          
                
                $collection = $this->getCollectionInstance();
                if($collection)
                {
                        $collection->delete();
                }
                
                $this->updateParentCollections();
        }
        
        final protected function updateParentCollections()
        {
                global $ilDB;
                
                include_once("./Services/Tracking/classes/class.ilLPStatusWrapper.php");
                
                // update parent collections?           
                $set = $ilDB->query("SELECT ut_lp_collections.obj_id obj_id FROM ".
                                "object_reference JOIN ut_lp_collections ON ".
                                "(object_reference.obj_id = ".$ilDB->quote($this->obj_id, "integer").
                                " AND object_reference.ref_id = ut_lp_collections.item_id)");
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        if (in_array(ilObject::_lookupType($rec["obj_id"]), array("crs", "grp", "fold")))
                        {                               
                                // remove from parent collection
                                $query = "DELETE FROM ut_lp_collections".
                                        " WHERE obj_id = ".$ilDB->quote($rec["obj_id"], "integer").
                                        " AND item_id = ".$ilDB->quote($this->obj_id, "integer");
                                $ilDB->manipulate($query);
                                
                                ilLPStatusWrapper::_refreshStatus($rec["obj_id"]);                              
                        }
                }
        }
        
        
        //
        // LP-relevant memberships
        // 
        
        protected static function isLPMember(array &$a_res, $a_usr_id,  $a_obj_ids)
        {
                // should be overwritten by object-type-specific class
                return false;
        }
        
        protected static function findMembershipsByPath(array &$a_res, $a_usr_id, $a_parent_ref_id, array $a_obj_ids, $a_mapped_ref_ids = false)
        {
                global $tree;
                
                $found = array();
                                
                // walk path to find course or group object and check members of that object
                $path = $tree->getPathId($a_parent_ref_id);                             
                foreach(array_reverse($path) as $path_ref_id)
                {
                        $type = ilObject::_lookupType($path_ref_id, true);                                                                              
                        if($type == "crs" || 
                                $type == "grp")
                        {
                                $class = self::getTypeClass($type);                             
                                $path_ob_id = ilObject::_lookupObjId($path_ref_id);
                                $chk = array();
                                $class::isLPMember($chk, $a_usr_id, array($path_ob_id));                                                                                                                                                                
                                if(!$a_mapped_ref_ids)
                                {
                                        // we found a grp/crs in path of (single) parent - mark all objects
                                        foreach($a_obj_ids as $obj_id)
                                        {
                                                $found[] = $obj_id;
                                                if($chk[$path_ob_id])
                                                {
                                                        $a_res[$obj_id] = true;                                                 
                                                }
                                        }               
                                }
                                else                                            
                                {
                                        // all children from current node are "lp-valid"
                                        foreach($a_obj_ids as $obj_id => $ref_ids)
                                        {
                                                foreach($ref_ids as $ref_id)
                                                {
                                                        if($tree->isGrandChild($path_ref_id, $ref_id))
                                                        {
                                                                $found[$obj_id][] = $ref_id;
                                                                if($chk[$path_ob_id])
                                                                {
                                                                        $a_res[$obj_id] = true;
                                                                }
                                                                break;
                                                        }
                                                }
                                        }                                               
                                }                               
                                break;
                        }
                }
                
                return $found;
        }
        
        public static function getLPMemberships($a_usr_id, array $a_obj_ids, $a_parent_ref_id = null, $a_mapped_ref_ids = false)
        {
                global $ilDB, $tree;
                
                // see ilTrQuery::getParticipantsForObject() [single object only]
                // this is optimized for larger number of objects, e.g. list GUIs
                
                if((bool)$a_mapped_ref_ids)
                {
                        $ref_map = $a_obj_ids;
                        $a_obj_ids = array_keys($a_obj_ids);                    
                }
                
                $res = array();
                
                // get object types
                $types_map = array();
                $query = " SELECT obj_id, type".
                        " FROM object_data".
                        " WHERE ".$ilDB->in("obj_id", $a_obj_ids, "", "integer");
                $set = $ilDB->query($query);            
                while($row = $ilDB->fetchAssoc($set))
                {                                                               
                        $types_map[$row["type"]][] = $row["obj_id"];
                        $res[$row["obj_id"]] = false;
                }
                
                $find_by_parent = array();
                foreach($types_map as $type => $type_obj_ids)
                {                                       
                        $class = self::getTypeClass($type);
                        if($class)
                        {
                                // lp-supported type?
                                if(!$class::isLPMember($res, $a_usr_id, $type_obj_ids))                                 
                                {                                       
                                        $find_by_parent = array_merge($find_by_parent, $type_obj_ids);                                  
                                }
                        }               
                }
                
                if(sizeof($find_by_parent))
                {
                        // single parent for all objects (repository/ilObjectListGUI)
                        if($a_parent_ref_id)
                        {
                                if(self::findMembershipsByPath($res, $a_usr_id, $a_parent_ref_id, $find_by_parent))
                                {
                                        // we found a crs/grp in path, so no need to check read_events
                                        $find_by_parent = null;
                                }
                        }
                        // different parents (PD > LP)                  
                        else if(sizeof($ref_map))
                        {                                                                               
                                foreach($find_by_parent as $obj_id)
                                {                                       
                                        // maybe already found by path search from other object/reference
                                        if($res[$obj_id] === false)
                                        {                                               
                                                if(isset($ref_map[$obj_id]))
                                                {
                                                        // check all references
                                                        foreach($ref_map[$obj_id] as $ref_id)
                                                        {                                                               
                                                                $parent_ref_id = $tree->getParentId($ref_id);
                                                                if($parent_ref_id == ROOT_FOLDER_ID)
                                                                {                                                                       
                                                                        continue;
                                                                }
                                                                
                                                                // we are checking the complete ref_map 
                                                                // to find all relevant objects in subtree of current ref_id
                                                                $found = self::findMembershipsByPath($res, $a_usr_id, $parent_ref_id, $ref_map, true);
                                                                if(sizeof($found))
                                                                {                                               
                                                                        // if any references were found in a crs/grp-subtree
                                                                        // remove from "read-event"-last-resort-pool
                                                                        foreach($found as $found_obj_id => $found_ref_ids)                                                              
                                                                        {                                                                                                                                                                                       
                                                                                $diff = array_diff($ref_map[$found_obj_id], $found_ref_ids);
                                                                                if($diff)
                                                                                {
                                                                                        // 1-n refs are in another subtree
                                                                                        // have to be checked separately
                                                                                        $ref_map[$found_obj_id] = $diff;
                                                                                }
                                                                                else
                                                                                {
                                                                                        // all references found in subtree
                                                                                        // no need to check again
                                                                                        unset($ref_map[$found_obj_id]);
                                                                                }                                                                               
                                                                        }                                                                        
                                                                        break;
                                                                }
                                                        }                                                       
                                                }
                                        }                                                                               
                                }               
                                
                                $find_by_parent = array_keys($ref_map);
                        }
                        
                        // last resort: use read_event?
                        if(sizeof($find_by_parent))
                        {                               
                                $set = $ilDB->query("SELECT obj_id".
                                        " FROM read_event".
                                        " WHERE ".$ilDB->in("obj_id", $find_by_parent, "", "integer").
                                        " AND usr_id = ".$ilDB->quote($a_usr_id, "integer"));
                                while($row = $ilDB->fetchAssoc($set))
                                {
                                        $res[$row["obj_id"]] = true;
                                }
                        }                                                       
                }
                
                return $res;
        }
        
        public function getMailTemplateId()
        {
                // type-specific
        }
        
        
        //
        // type-specific support of features (should be enhanced)
        // 
        
        public static function supportsSpentSeconds($a_obj_type)
        {
                return !in_array($a_obj_type, array("exc", "file", "mcst", "mob", "htlm"));
        }
        
        public static function supportsMark($a_obj_type)
        {
                return !in_array($a_obj_type, array("lm", "dbk"));
        }
        
        public static function supportsMatrixView($a_obj_type)
        {
                return !in_array($a_obj_type, array('svy', 'tst', 'htlm', 'exc', 'sess', 'file', 'prg'));
        }               
}

?>