class.ilPCQuestion.php

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<?php

/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */


require_once("./Services/COPage/classes/class.ilPageContent.php");

class ilPCQuestion extends ilPageContent
{
        var $dom;
        var $q_node;                    // node of Paragraph element
        
        function init()
        {
                $this->setType("pcqst");
        }

        function setNode(&$a_node)
        {
                parent::setNode($a_node);               // this is the PageContent node
                $this->q_node =& $a_node->first_child();                //... and this the Question
        }

        function setQuestionReference($a_questionreference)
        {
                if (is_object($this->q_node))
                {
                        $this->q_node->set_attribute("QRef", $a_questionreference);
                }
        }

        function getQuestionReference()
        {
                if (is_object($this->q_node))
                {
                        return $this->q_node->get_attribute("QRef", $a_questionreference);
                }
                return false;
        }

        function create(&$a_pg_obj, $a_hier_id)
        {
                $this->createPageContentNode();
                $a_pg_obj->insertContent($this, $a_hier_id, IL_INSERT_AFTER);
                $this->q_node = $this->dom->create_element("Question");
                $this->q_node = $this->node->append_child($this->q_node);
                $this->q_node->set_attribute("QRef", "");
        }
        
        function copyPoolQuestionIntoPage($a_q_id, $a_hier_id)
        {
                include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
                $question = assQuestion::_instanciateQuestion($a_q_id);
                $duplicate_id = $question->copyObject(0, $question->getTitle());
                $duplicate = assQuestion::_instanciateQuestion($duplicate_id);
                $duplicate->setObjId(0);
                
                // we remove everything not supported by the non-tiny self
                // assessment question editor
                $q = $duplicate->getQuestion();

                // we try to save all latex tags
                $try = true;
                $ls = '<span class="latex">';
                $le = '</span>';
                while ($try)
                {
                        // search position of start tag
                        $pos1 = strpos($q, $ls);
                        if (is_int($pos1))
                        {
                                $pos2 = strpos($q, $le, $pos1);
                                if (is_int($pos2))
                                {
                                        // both found: replace end tag
                                        $q = substr($q, 0, $pos2)."[/tex]".substr($q, $pos2+7);
                                        $q = substr($q, 0, $pos1)."[tex]".substr($q, $pos1+20);
                                }
                                else
                                {
                                        $try = false;
                                }
                        }
                        else
                        {
                                $try = false;
                        }
                }
                
                $tags = assQuestionGUI::getSelfAssessmentTags();
                $tstr = "";
                foreach ($tags as $t)
                {
                        $tstr.="<".$t.">";
                }
                $q = ilUtil::secureString($q, true, $tstr);
                // self assessment uses nl2br, not p
                $duplicate->setQuestion($q);
                
                $duplicate->saveQuestionDataToDb();
                
                $this->q_node->set_attribute("QRef", "il__qst_".$duplicate_id);
        }
        
        static function getLangVars()
        {
                return array("ed_insert_pcqst", "empty_question", "pc_qst");
        }

        static function afterPageUpdate($a_page, DOMDocument $a_domdoc, $a_xml, $a_creation)
        {
                global $ilDB;
                
                include_once("./Services/COPage/classes/class.ilInternalLink.php");
                
                $ilDB->manipulateF("DELETE FROM page_question WHERE page_parent_type = %s ".
                        " AND page_id = %s AND page_lang = %s", array("text", "integer", "text"),
                        array($a_page->getParentType(), $a_page->getId(), $a_page->getLanguage()));

                $xpath = new DOMXPath($a_domdoc);
                $nodes = $xpath->query('//Question');   
                $q_ids = array();
                foreach ($nodes as $node)
                {
                        $q_ref = $node->getAttribute("QRef");

                        $inst_id = ilInternalLink::_extractInstOfTarget($q_ref);
                        if (!($inst_id > 0))
                        {
                                $q_id = ilInternalLink::_extractObjIdOfTarget($q_ref);
                                if ($q_id > 0)
                                {
                                        $q_ids[$q_id] = $q_id;
                                }
                        }
                }
                foreach($q_ids as $qid)
                {
                        $ilDB->manipulateF("INSERT INTO page_question (page_parent_type, page_id, page_lang, question_id)".
                                " VALUES (%s,%s,%s,%s)",
                                array("text", "integer", "text", "integer"),
                                array($a_page->getParentType(), $a_page->getId(), $a_page->getLanguage(), $qid));
                }

        }
        
        static function beforePageDelete($a_page)
        {
                global $ilDB;
                
                $ilDB->manipulateF("DELETE FROM page_question WHERE page_parent_type = %s ".
                        " AND page_id = %s AND page_lang = %s", array("text", "integer", "text"),
                        array($a_page->getParentType(), $a_page->getId(), $a_page->getLanguage()));
        }
        
        static function _getQuestionIdsForPage($a_parent_type, $a_page_id, $a_lang = "-")
        {
                global $ilDB;

                $res = $ilDB->queryF("SELECT * FROM page_question WHERE page_parent_type = %s ".
                        " AND page_id = %s AND page_lang = %s",
                        array("text", "integer", "text"),
                        array($a_parent_type, $a_page_id, $a_lang));
                $q_ids = array();
                while ($rec = $ilDB->fetchAssoc($res))
                {
                        $q_ids[] = $rec["question_id"];
                }

                return $q_ids;
        }

        function _getPageForQuestionId($a_q_id, $a_parent_type = "")
        {
                global $ilDB;

                $set = $ilDB->query("SELECT * FROM page_question ".
                        " WHERE question_id = ".$ilDB->quote($a_q_id, "integer")
                        );
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        if ($a_parent_type == "" || $rec["page_parent_type"] == $a_parent_type)
                        {
                                return array("page_id" => $rec["page_id"], "parent_type" => $rec["page_parent_type"]);
                        }
                }
                return false;
        }


}
?>