class.ilObjSurveyQuestionPool.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/
 
include_once "./Services/Object/classes/class.ilObject.php";
 
class ilObjSurveyQuestionPool extends ilObject
{
        var $online;
        
        function ilObjSurveyQuestionPool($a_id = 0,$a_call_by_reference = true)
        {
                $this->type = "spl";
                $this->ilObject($a_id,$a_call_by_reference);
        }
 
        function create($a_upload = false)
        {
                parent::create();
                if(!$a_upload)
                {
                        $this->createMetaData();
                }
        }
 
        function update()
        {
                $this->updateMetaData();
                if (!parent::update())
                {
                        return false;
                }
 
                // put here object specific stuff
 
                return true;
        }
 
        function read($a_force_db = false)
        {
                parent::read($a_force_db);
                $this->loadFromDb();
        }
 
                function cloneObject($a_target_id,$a_copy_id = 0)
                {
                        global $ilLog;
                        $newObj = parent::cloneObject($a_target_id,$a_copy_id);
 
                        //copy online status if object is not the root copy object
                        $cp_options = ilCopyWizardOptions::_getInstance($a_copy_id);
 
                        if(!$cp_options->isRootNode($this->getRefId()))
                        {
                                $newObj->setOnline($this->getOnline());
                        }
 
                        $newObj->saveToDb();
                        // clone the questions in the question pool
                        $questions =& $this->getQuestions();
                        foreach ($questions as $question_id)
                        {
                                $newObj->copyQuestion($question_id, $newObj->getId());
                        }
 
                        // clone meta data
                        include_once "./Services/MetaData/classes/class.ilMD.php";
                        $md = new ilMD($this->getId(),0,$this->getType());
                        $new_md =& $md->cloneMD($newObj->getId(),0,$newObj->getType());
 
                        // update the metadata with the new title of the question pool
                        $newObj->updateMetaData();
                        return $newObj;
                }
 
                function &createQuestion($question_type, $question_id = -1)
                {
                        if ((!$question_type) and ($question_id > 0))
                        {
                                $question_type = $this->getQuestiontype($question_id);
                        }
 
                        include_once "./Modules/SurveyQuestionPool/classes/class.".$question_type."GUI.php";
                        $question_type_gui = $question_type . "GUI";
                        $question =& new $question_type_gui();
 
                        if ($question_id > 0)
                        {
                                $question->object->loadFromDb($question_id);
                        }
 
                        return $question;
                }
 
                function copyQuestion($question_id, $questionpool_to)
                {
                        $question_gui =& $this->createQuestion("", $question_id);
                        if ($question_gui->object->getObjId() == $questionpool_to)
                        {
                                // the question is copied into the same question pool
                                $this->duplicateQuestion($question_id);
                        }
                        else
                        {
                                // the question is copied into another question pool
                                $newtitle = $question_gui->object->getTitle(); 
                                if ($question_gui->object->questionTitleExists($question_gui->object->getTitle(), $questionpool_to))
                                {
                                        $counter = 2;
                                        while ($question_gui->object->questionTitleExists($question_gui->object->getTitle() . " ($counter)", $questionpool_to))
                                        {
                                                $counter++;
                                        }
                                        $newtitle = $question_gui->object->getTitle() . " ($counter)";
                                }
                                $question_gui->object->copyObject($this->getId(), $newtitle);
                        }
                }
 
        function loadFromDb()
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT * FROM svy_qpl WHERE obj_fi = %s",
                        array('integer'),
                        array($this->getId())
                );
                if ($result->numRows() == 1)
                {
                        $row = $ilDB->fetchAssoc($result);
                        $this->setOnline($row["isonline"]);
                }
        }
        
  function saveToDb()
  {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT * FROM svy_qpl WHERE obj_fi = %s",
                        array('integer'),
                        array($this->getId())
                );
                if ($result->numRows() == 1)
                {
                        $affectedRows = $ilDB->manipulateF("UPDATE svy_qpl SET isonline = %s, tstamp = %s WHERE obj_fi = %s",
                                array('text','integer','integer'),
                                array($this->getOnline(), time(), $this->getId())
                        );
                }
                else
                {
                        $next_id = $ilDB->nextId('svy_qpl');
                        $query = $ilDB->manipulateF("INSERT INTO svy_qpl (id_questionpool, isonline, obj_fi, tstamp) VALUES (%s, %s, %s, %s)",
                                array('integer', 'text', 'integer', 'integer'),
                                array($next_id, $this->getOnline(), $this->getId(), time())
                        );
                }
        }
        
        function delete()
        {
                $remove = parent::delete();
                // always call parent delete function first!!
                if (!$remove)
                {
                        return false;
                }
 
                // delete all related questions
                $this->deleteAllData();
 
                // delete meta data
                $this->deleteMetaData();
                
                return true;
        }
 
        function deleteAllData()
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT question_id FROM svy_question WHERE obj_fi = %s AND original_id IS NULL",
                        array('integer'),
                        array($this->getId())
                );
                $found_questions = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $this->removeQuestion($row["question_id"]);
                }
 
                // delete export files
                include_once "./Services/Utilities/classes/class.ilUtil.php";
                $spl_data_dir = ilUtil::getDataDir()."/spl_data";
                $directory = $spl_data_dir."/spl_".$this->getId();
                if (is_dir($directory))
                {
                        include_once "./Services/Utilities/classes/class.ilUtil.php";
                        ilUtil::delDir($directory);
                }
        }
 
        function notify($a_event,$a_ref_id,$a_parent_non_rbac_id,$a_node_id,$a_params = 0)
        {
                global $tree;
                
                switch ($a_event)
                {
                        case "link":
                                
                                //var_dump("<pre>",$a_params,"</pre>");
                                //echo "Module name ".$this->getRefId()." triggered by link event. Objects linked into target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                        
                        case "cut":
                                
                                //echo "Module name ".$this->getRefId()." triggered by cut event. Objects are removed from target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                                
                        case "copy":
                        
                                //var_dump("<pre>",$a_params,"</pre>");
                                //echo "Module name ".$this->getRefId()." triggered by copy event. Objects are copied into target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
 
                        case "paste":
                                
                                //echo "Module name ".$this->getRefId()." triggered by paste (cut) event. Objects are pasted into target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                        
                        case "new":
                                
                                //echo "Module name ".$this->getRefId()." triggered by paste (new) event. Objects are applied to target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                }
                
                // At the beginning of the recursive process it avoids second call of the notify function with the same parameter
                if ($a_node_id==$_GET["ref_id"])
                {       
                        $parent_obj =& $this->ilias->obj_factory->getInstanceByRefId($a_node_id);
                        $parent_type = $parent_obj->getType();
                        if($parent_type == $this->getType())
                        {
                                $a_node_id = (int) $tree->getParentId($a_node_id);
                        }
                }
                
                parent::notify($a_event,$a_ref_id,$a_parent_non_rbac_id,$a_node_id,$a_params);
        }
 
        function getTitle()
        {
                //return $this->title;
                return parent::getTitle();
        }
 
        function setTitle($a_title)
        {
                parent::setTitle($a_title);
        }
 
        function removeQuestion($question_id)
        {
                if ($question_id < 1) return;
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                $question =& SurveyQuestion::_instanciateQuestion($question_id);
                $question->delete($question_id);
        }
 
        function getQuestiontype($question_id) 
        {
                global $ilDB;
                if ($question_id < 1) return;
                $result = $ilDB->queryF("SELECT svy_qtype.type_tag FROM svy_question, svy_qtype WHERE svy_question.questiontype_fi = svy_qtype.questiontype_id AND svy_question.question_id = %s",
                        array('integer'),
                        array($question_id)
                );
                if ($result->numRows() == 1) 
                {
                        $data = $ilDB->fetchAssoc($result);
                        return $data["type_tag"];
                }
                else 
                {
                        return;
                }
        }
        
        function isInUse($question_id)
        {
                global $ilDB;
                // check out the already answered questions
                $result = $ilDB->queryF("SELECT answer_id FROM svy_answer WHERE question_fi = %s",
                        array('integer'),
                        array($question_id)
                );
                $answered = $result->numRows();
                
                // check out the questions inserted in surveys
                $result = $ilDB->queryF("SELECT svy_svy.* FROM svy_svy, svy_svy_qst WHERE svy_svy_qst.survey_fi = svy_svy.survey_id AND svy_svy_qst.question_fi = %s",
                        array('integer'),
                        array($question_id)
                );
                $inserted = $result->numRows();
                if (($inserted + $answered) == 0)
                {
                        return false;
                }
                $result_array = array();
                while ($row = $ilDB->fetchObject($result))
                {
                        array_push($result_array, $row);
                }
                return $result_array;
        }
        
        function paste($question_id)
        {
                $this->duplicateQuestion($question_id, $this->getId());
        }
        
        function &getQuestionsInfo($question_array)
        {
                global $ilDB;
                $result_array = array();
                $result = $ilDB->query("SELECT svy_question.*, svy_qtype.type_tag, svy_qtype.plugin FROM svy_question, svy_qtype WHERE svy_question.questiontype_fi = svy_qtype.questiontype_id AND svy_question.tstamp > 0 AND " . $ilDB->in('svy_question.question_id', $question_array, false, 'integer'));
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if ($row["plugin"])
                        {
                                if ($this->isPluginActive($row["type_tag"]))
                                {
                                        array_push($result_array, $row);
                                }
                        }
                        else
                        {
                                array_push($result_array, $row);
                        }
                }
                return $result_array;
        }
        
        function duplicateQuestion($question_id, $obj_id = "") 
        {
                global $ilUser;
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                $question = SurveyQuestion::_instanciateQuestion($question_id);
                $suffix = "";
                $counter = 1;
                while ($question->questionTitleExists($question->getTitle().$suffix, $obj_id)) 
                {
                        $counter++;
                        if ($counter > 1) $suffix = " ($counter)";
                }
                if ($obj_id)
                {
                        $question->setObjId($obj_id);
                }
                $question->duplicate(false, $question->getTitle() . $suffix, $ilUser->fullname, $ilUser->id);
        }
        
        function getQuestionsData($arrFilter)
        {
                global $ilUser;
                global $ilDB;
                $where = "";
                if (is_array($arrFilter))
                {
                        foreach ($arrFilter as $key => $value)
                        {
                                $arrFilter[$key] = str_replace('%', '', $arrFilter[$key]);
                        }
                        if (array_key_exists('title', $arrFilter) && strlen($arrFilter['title']))
                        {
                                $where .= " AND " . $ilDB->like('svy_question.title', 'text', "%%" . $arrFilter['title'] . "%%");
                        }
                        if (array_key_exists('description', $arrFilter) && strlen($arrFilter['description']))
                        {
                                $where .= " AND " . $ilDB->like('svy_question.description', 'text', "%%" . $arrFilter['description'] . "%%");
                        }
                        if (array_key_exists('author', $arrFilter) && strlen($arrFilter['author']))
                        {
                                $where .= " AND " . $ilDB->like('svy_question.author', 'text', "%%" . $arrFilter['author'] . "%%");
                        }
                        if (array_key_exists('type', $arrFilter) && strlen($arrFilter['type']))
                        {
                                $where .= " AND svy_qtype.type_tag = " . $ilDB->quote($arrFilter['type'], 'text');
                        }
                }
                $query_result = $ilDB->queryF("SELECT svy_question.*, svy_qtype.type_tag, svy_qtype.plugin FROM svy_question, svy_qtype WHERE svy_question.original_id IS NULL AND svy_question.tstamp > 0 AND svy_question.questiontype_fi = svy_qtype.questiontype_id AND svy_question.obj_fi = %s" . $where,
                        array('integer'),
                        array($this->getId())
                );
                $rows = array();
                if ($query_result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($query_result))
                        {
                                // first part fix #19469
                                $set = $ilDB->query("SELECT question_fi FROM svy_svy_qst  ".
                                        " WHERE question_fi = ".$ilDB->quote($row["question_id"], "integer")
                                        );
                                if ($temp = $ilDB->fetchAssoc($set))
                                {
                                        continue;
                                }
                                if ($row["plugin"])
                                {
                                        if ($this->isPluginActive($row["type_tag"]))
                                        {
                                                array_push($rows, $row);
                                        }
                                }
                                else
                                {
                                        array_push($rows, $row);
                                }
                        }
                }
                return $rows;
        }
 
        function createExportDirectory()
        {
                include_once "./Services/Utilities/classes/class.ilUtil.php";
                $spl_data_dir = ilUtil::getDataDir()."/spl_data";
                ilUtil::makeDir($spl_data_dir);
                if(!is_writable($spl_data_dir))
                {
                        $this->ilias->raiseError("Survey Questionpool Data Directory (".$spl_data_dir
                                .") not writeable.",$this->ilias->error_obj->FATAL);
                }
                
                // create learning module directory (data_dir/lm_data/lm_<id>)
                $spl_dir = $spl_data_dir."/spl_".$this->getId();
                ilUtil::makeDir($spl_dir);
                if(!@is_dir($spl_dir))
                {
                        $this->ilias->raiseError("Creation of Survey Questionpool Directory failed.",$this->ilias->error_obj->FATAL);
                }
                // create Export subdirectory (data_dir/lm_data/lm_<id>/Export)
                $export_dir = $spl_dir."/export";
                ilUtil::makeDir($export_dir);
                if(!@is_dir($export_dir))
                {
                        $this->ilias->raiseError("Creation of Export Directory failed.",$this->ilias->error_obj->FATAL);
                }
        }
 
        function getExportDirectory()
        {
                include_once "./Services/Utilities/classes/class.ilUtil.php";
                $export_dir = ilUtil::getDataDir()."/spl_data"."/spl_".$this->getId()."/export";
                return $export_dir;
        }
        
        function getExportFiles($dir)
        {
                // quit if import dir not available
                if (!@is_dir($dir) or
                        !is_writeable($dir))
                {
                        return array();
                }
 
                        // open directory
                $dir = dir($dir);
 
                // initialize array
                $file = array();
 
                // get files and save the in the array
                while ($entry = $dir->read())
                {
                        if ($entry != "." &&
                                $entry != ".." &&
                                ereg("^[0-9]{10}_{2}[0-9]+_{2}(spl_)*[0-9]+\.[A-Za-z]{3}\$", $entry))
                        {
                                $file[] = $entry;
                        }
                }
 
                // close import directory
                $dir->close();
                // sort files
                sort ($file);
                reset ($file);
 
                return $file;
        }
 
        function createImportDirectory()
        {
                include_once "./Services/Utilities/classes/class.ilUtil.php";
                $spl_data_dir = ilUtil::getDataDir()."/spl_data";
                ilUtil::makeDir($spl_data_dir);
                
                if(!is_writable($spl_data_dir))
                {
                        $this->ilias->raiseError("Survey Questionpool Data Directory (".$spl_data_dir
                                .") not writeable.",$this->ilias->error_obj->FATAL);
                }
 
                // create test directory (data_dir/spl_data/spl_<id>)
                $spl_dir = $spl_data_dir."/spl_".$this->getId();
                ilUtil::makeDir($spl_dir);
                if(!@is_dir($spl_dir))
                {
                        $this->ilias->raiseError("Creation of Survey Questionpool Directory failed.",$this->ilias->error_obj->FATAL);
                }
 
                // create import subdirectory (data_dir/spl_data/spl_<id>/import)
                $import_dir = $spl_dir."/import";
                ilUtil::makeDir($import_dir);
                if(!@is_dir($import_dir))
                {
                        $this->ilias->raiseError("Creation of Import Directory failed.",$this->ilias->error_obj->FATAL);
                }
        }
 
        function getImportDirectory()
        {
                include_once "./Services/Utilities/classes/class.ilUtil.php";
                $import_dir = ilUtil::getDataDir()."/spl_data".
                        "/spl_".$this->getId()."/import";
                if(@is_dir($import_dir))
                {
                        return $import_dir;
                }
                else
                {
                        return false;
                }
        }
 
        function toXML($questions)
        {
                if (!is_array($questions))
                {
                        $questions =& $this->getQuestions();
                }
                if (count($questions) == 0)
                {
                        $questions =& $this->getQuestions();
                }
                $xml = "";
 
                include_once("./Services/Xml/classes/class.ilXmlWriter.php");
                $a_xml_writer = new ilXmlWriter;
                // set xml header
                $a_xml_writer->xmlHeader();
                $attrs = array(
                        "xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance",
                        "xsi:noNamespaceSchemaLocation" => "http://www.ilias.de/download/xsd/ilias_survey_4_2.xsd"
                );
                $a_xml_writer->xmlStartTag("surveyobject", $attrs);
                $attrs = array(
                        "id" => "qpl_" . $this->getId(),
                        "label" => $this->getTitle(),
                        "online" => $this->getOnline()
                );
                $a_xml_writer->xmlStartTag("surveyquestions", $attrs);
                $a_xml_writer->xmlElement("dummy", NULL, "dummy");
                // add ILIAS specific metadata
                $a_xml_writer->xmlStartTag("metadata");
                $a_xml_writer->xmlStartTag("metadatafield");
                $a_xml_writer->xmlElement("fieldlabel", NULL, "SCORM");
                include_once "./Services/MetaData/classes/class.ilMD.php";
                $md = new ilMD($this->getId(),0, $this->getType());
                $writer = new ilXmlWriter();
                $md->toXml($writer);
                $metadata = $writer->xmlDumpMem();
                $a_xml_writer->xmlElement("fieldentry", NULL, $metadata);
                $a_xml_writer->xmlEndTag("metadatafield");
                $a_xml_writer->xmlEndTag("metadata");
 
                $a_xml_writer->xmlEndTag("surveyquestions");
                $a_xml_writer->xmlEndTag("surveyobject");
 
                $xml = $a_xml_writer->xmlDumpMem(FALSE);
 
                $questionxml = "";
                foreach ($questions as $key => $value)
                {
                        $questiontype = $this->getQuestiontype($value);
                        include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                        SurveyQuestion::_includeClass($questiontype);
                        $question = new $questiontype();
                        $question->loadFromDb($value);
                        $questionxml .= $question->toXML(false);
                }
                
                $xml = str_replace("<dummy>dummy</dummy>", $questionxml, $xml);
                return $xml;
        }
 
        function &getQuestions()
        {
                global $ilDB;
                $questions = array();
                $result = $ilDB->queryF("SELECT question_id FROM svy_question WHERE obj_fi = %s AND svy_question.tstamp > 0 AND original_id IS NULL",
                        array('integer'),
                        array($this->getId())
                );
                if ($result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                array_push($questions, $row["question_id"]);
                        }
                }
                return $questions;
        }
 
        function importObject($source, $spl_exists = FALSE)
        {
                if (is_file($source))
                {
                        $isZip = (strcmp(strtolower(substr($source, -3)), 'zip') == 0);
                        if ($isZip)
                        {
                                // unzip file
                                ilUtil::unzip($source);
 
                                // determine filenames of xml files
                                $subdir = basename($source, ".zip");
                                $source = dirname($source)."/".$subdir."/".$subdir.".xml";
                        }
 
                        $fh = fopen($source, "r") or die("");
                        $xml = fread($fh, filesize($source));
                        fclose($fh) or die("");
                        if ($isZip)
                        {
                                $subdir = basename($source, ".zip");
                                if (@is_dir(dirname($source)."/".$subdir))
                                {
                                        ilUtil::delDir(dirname($source)."/".$subdir);
                                }
                        }
                        if (strpos($xml, "questestinterop") > 0)
                        {
                                // survey questions for ILIAS < 3.8
                                include_once "./Services/Survey/classes/class.SurveyImportParserPre38.php";
                                $import = new SurveyImportParserPre38($this->getId(), "", $spl_exists);
                                $import->setXMLContent($xml);
                                $import->startParsing();
                        }
                        else
                        {
                                // survey questions for ILIAS >= 3.8
                                include_once "./Services/Survey/classes/class.SurveyImportParser.php";
                                $import = new SurveyImportParser($this->getId(), "", $spl_exists);
                                $import->setXMLContent($xml);
                                $import->startParsing();
                        }
                }
        }
 
        public static function _setOnline($a_obj_id, $a_online_status)
        {
                global $ilDB;
                
                $status = "0";
                switch ($a_online_status)
                {
                        case 0:
                        case 1:
                                $status = "$a_online_status";
                                break;
                }
                $affectedRows = $ilDB->manipulateF("UPDATE svy_qpl SET isonline = %s  WHERE obj_fi = %s",
                        array('text','integer'),
                        array($status, $a_obj_id)
                );
        }
        
        function setOnline($a_online_status)
        {
                switch ($a_online_status)
                {
                        case 0:
                        case 1:
                                $this->online = $a_online_status;
                                break;
                        default:
                                $this->online = 0;
                                break;
                }
        }
        
        function getOnline()
        {
                if (strcmp($this->online, "") == 0) $this->online = "0";
                return $this->online;
        }
        
        function _lookupOnline($a_obj_id)
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT isonline FROM svy_qpl WHERE obj_fi = %s",
                        array('integer'),
                        array($a_obj_id)
                );
                if ($result->numRows() == 1)
                {
                        $row = $ilDB->fetchAssoc($result);
                        return $row["isonline"];
                }
                return 0;
        }
 
        function _isWriteable($object_id, $user_id)
        {
                global $rbacsystem;
                global $ilDB;
                
                $refs = ilObject::_getAllReferences($object_id);
                $result = false;
                foreach ($refs as $ref)
                {
                        if ($rbacsystem->checkAccess("write", $ref) && (ilObject::_hasUntrashedReference($object_id)))
                        {
                                $result = true;
                        }
                }
                return $result;
        }
 
        function &_getQuestiontypes()
        {
                global $ilDB;
                global $lng;
                
                $lng->loadLanguageModule("survey");
                $types = array();
                $query_result = $ilDB->query("SELECT * FROM svy_qtype ORDER BY type_tag");
                while ($row = $ilDB->fetchAssoc($query_result))
                {
                        //array_push($questiontypes, $row["type_tag"]);
                        if ($row["plugin"] == 0)
                        {
                                $types[$lng->txt($row["type_tag"])] = $row;
                        }
                        else
                        {
                                global $ilPluginAdmin;
                                $pl_names = $ilPluginAdmin->getActivePluginsForSlot(IL_COMP_MODULE, "SurveyQuestionPool", "svyq");
                                foreach ($pl_names as $pl_name)
                                {                                       
                                        $pl = ilPlugin::getPluginObject(IL_COMP_MODULE, "SurveyQuestionPool", "svyq", $pl_name);
                                        if (strcmp($pl->getQuestionType(), $row["type_tag"]) == 0)
                                        {
                                                $types[$pl->getQuestionTypeTranslation()] = $row;
                                        }
                                }
                        }
                }
                ksort($types);
                
                
                // #14263 - default sorting             
                
                $default_sorting = array_flip(array(
                        "SurveySingleChoiceQuestion", 
                        "SurveyMultipleChoiceQuestion", 
                        "SurveyMatrixQuestion", 
                        "SurveyMetricQuestion",
                        "SurveyTextQuestion"
                ));
   
                $sorted = array();
                $idx = sizeof($default_sorting);
                foreach($types as $caption => $item)
                {
                        $type = $item["type_tag"];
                        $item["caption"] = $caption;
                        
                        // default
                        if(array_key_exists($type, $default_sorting))
                        {                               
                                $sorted[$default_sorting[$type]] = $item;
                        }
                        // plugin (append alphabetically sorted)
                        else
                        {
                                $sorted[$idx] = $item;
                                $idx++;
                        }
                }
                ksort($sorted);
                
                // redo captions as index
                $types = array();
                foreach($sorted as $item)
                {
                        $types[$item["caption"]] = $item;
                }
                
                return $types;
        }
        
        public static function &_getQuestionTypeTranslations()
        {
                global $ilDB;
                global $lng;
                global $ilLog;
                global $ilPluginAdmin;
                
                $lng->loadLanguageModule("survey");
                $result = $ilDB->query("SELECT * FROM svy_qtype");
                $types = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if ($row["plugin"] == 0)
                        {
                                $types[$row['type_tag']] = $lng->txt($row["type_tag"]);
                        }
                        else
                        {
                                $pl_names = $ilPluginAdmin->getActivePluginsForSlot(IL_COMP_MODULE, "SurveyQuestionPool", "svyq");
                                foreach ($pl_names as $pl_name)
                                {
                                        $pl = ilPlugin::getPluginObject(IL_COMP_MODULE, "SurveyQuestionPool", "svyq", $pl_name);
                                        if (strcmp($pl->getQuestionType(), $row["type_tag"]) == 0)
                                        {
                                                $types[$row['type_tag']] = $pl->getQuestionTypeTranslation();
                                        }
                                }
                        }
                }
                ksort($types);
                return $types;
        }
 
        function _getAvailableQuestionpools($use_object_id = FALSE, $could_be_offline = FALSE, $showPath = FALSE, $permission = "read")
        {
                global $ilUser;
                global $ilDB;
 
                $result_array = array();
                $qpls = ilUtil::_getObjectsByOperations("spl", $permission, $ilUser->getId(), -1);
                $titles = ilObject::_prepareCloneSelection($qpls, "spl", $showPath);
                $allqpls = array();
                $result = $ilDB->query("SELECT obj_fi, isonline FROM svy_qpl");         
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $allqpls[$row['obj_fi']] = $row['isonline'];
                }
                foreach ($qpls as $ref_id)
                {
                        $obj_id = ilObject::_lookupObjectId($ref_id);
                        if ($could_be_offline || $allqpls[$obj_id] == 1)
                        {
                                if ($use_object_id)
                                {
                                        $result_array[$obj_id] = $titles[$ref_id];
                                }
                                else
                                {
                                        $result_array[$ref_id] = $titles[$ref_id];
                                }
                        }
                }
                return $result_array;
        }
 
        function isPluginActive($a_pname)
        {
                global $ilPluginAdmin;
                if ($ilPluginAdmin->isActive(IL_COMP_MODULE, "SurveyQuestionPool", "svyq", $a_pname))
                {
                        return TRUE;
                }
                else
                {
                        return FALSE;
                }
        }
        
        public function getQuestionInfos($question_ids)
        {
                global $ilDB;
                
                $found = array();
                $query_result = $ilDB->query("SELECT svy_question.*, svy_qtype.type_tag FROM svy_question, svy_qtype " .
                        "WHERE svy_question.questiontype_fi = svy_qtype.questiontype_id " .
                        "AND svy_question.tstamp > 0 AND " . $ilDB->in('svy_question.question_id', $question_ids, false, 'integer') . " " .
                        "ORDER BY svy_question.title");
                if ($query_result->numRows() > 0)
                {
                        while ($data = $ilDB->fetchAssoc($query_result))
                        {
                                if (in_array($data["question_id"], $question_ids))
                                {
                                        array_push($found, array('id' => $data["question_id"], 
                                                'title' => $data["title"], 
                                                'description' => $data["description"], 
                                                'type_tag' => $data["type_tag"]));                              
                                }
                        }
                }
                return $found;
        }
 
        /*
        * Remove all questions with tstamp = 0
        */
        public function purgeQuestions()
        {
                global $ilDB, $ilUser;
                
                $result = $ilDB->queryF("SELECT question_id FROM svy_question WHERE owner_fi = %s AND tstamp = %s", 
                        array("integer", "integer"),
                        array($ilUser->getId(), 0)
                );
                while ($data = $ilDB->fetchAssoc($result))
                {
                        $this->removeQuestion($data["question_id"]);
                }
        }
 
        public function copyToClipboard($question_id)
        {
                if (!array_key_exists("spl_clipboard", $_SESSION))
                {
                        $_SESSION["spl_clipboard"] = array();
                }
                $_SESSION["spl_clipboard"][$question_id] = array("question_id" => $question_id, "action" => "copy");
        }
        
        public function moveToClipboard($question_id)
        {
                if (!array_key_exists("spl_clipboard", $_SESSION))
                {
                        $_SESSION["spl_clipboard"] = array();
                }
                $_SESSION["spl_clipboard"][$question_id] = array("question_id" => $question_id, "action" => "move");
        }
 
        public function pasteFromClipboard()
        {
                global $ilDB;
 
                if (array_key_exists("spl_clipboard", $_SESSION))
                {
                        foreach ($_SESSION["spl_clipboard"] as $question_object)
                        {
                                if (strcmp($question_object["action"], "move") == 0)
                                {
                                        $result = $ilDB->queryF("SELECT obj_fi FROM svy_question WHERE question_id = %s",
                                                array('integer'),
                                                array($question_object["question_id"])
                                        );
                                        if ($result->numRows() == 1)
                                        {
                                                $row = $ilDB->fetchAssoc($result);
                                                $source_questionpool = $row["obj_fi"];
                                                if ($this->getId() != $source_questionpool)
                                                {
                                                        // change the questionpool id in the qpl_questions table
                                                        $affectedRows = $ilDB->manipulateF("UPDATE svy_question SET obj_fi = %s WHERE question_id = %s",
                                                                array('integer','integer'),
                                                                array($this->getId(), $question_object["question_id"])
                                                        );
 
                                                        // move question data to the new target directory
                                                        $source_path = CLIENT_WEB_DIR . "/survey/" . $source_questionpool . "/" . $question_object["question_id"] . "/";
                                                        if (@is_dir($source_path))
                                                        {
                                                                $target_path = CLIENT_WEB_DIR . "/survey/" . $this->getId() . "/";
                                                                if (!@is_dir($target_path))
                                                                {
                                                                        include_once "./Services/Utilities/classes/class.ilUtil.php";
                                                                        ilUtil::makeDirParents($target_path);
                                                                }
                                                                @rename($source_path, $target_path . $question_object["question_id"]);
                                                        }
                                                }
                                                else
                                                {
                                                        ilUtil::sendFailure($this->lng->txt("spl_move_same_pool"), true);
                                                        return;
                                                }
                                        }
                                }
                                else
                                {
                                        $this->copyQuestion($question_object["question_id"], $this->getId());
                                }
                        }
                }
                ilUtil::sendSuccess($this->lng->txt("spl_paste_success"), true);
                unset($_SESSION["spl_clipboard"]);
        }
        
        function setObligatoryStates($obligatory_questions)
        {                               
                global $ilDB;
                
                foreach($this->getQuestions() as $question_id)
                {
                        $status = (int)(in_array($question_id, $obligatory_questions));
                        
                        $ilDB->manipulate("UPDATE svy_question".
                                " SET obligatory = ".$ilDB->quote($status, "integer").
                                " WHERE question_id = ".$ilDB->quote($question_id, "integer"));                         
                }               
        }
} // END class.ilSurveyObjQuestionPool
?>