content/classes/class.ilObjContentObject.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. |
        +-----------------------------------------------------------------------------+
*/


require_once "classes/class.ilObject.php";
require_once "classes/class.ilMetaData.php";
require_once("classes/class.ilNestedSetXML.php");
//require_once("content/classes/class.ilPageObject.php");

class ilObjContentObject extends ilObject
{
        var $lm_tree;
        var $meta_data;
        var $layout;
        var $style_id;
        var $pg_header;
        var $online;

        function ilObjContentObject($a_id = 0,$a_call_by_reference = true)
        {
                // this also calls read() method! (if $a_id is set)
                $this->ilObject($a_id,$a_call_by_reference);

                if ($a_id == 0)
                {
                        $this->initMeta();
                }

                $this->mob_ids = array();
                $this->file_ids = array();
        }

        function initMeta()
        {
                if (!is_object($this->meta_data))
                {
                        if ($this->getId())
                        {
                                $new_meta =& new ilMetaData($this->getType(), $this->getId());
                        }
                        else
                        {
                                $new_meta =& new ilMetaData();
                        }
                        $this->assignMetaData($new_meta);
                }
        }

        function create($a_upload = false)
        {
                global $ilUser;

                parent::create();
                $this->createProperties();
                if (!$a_upload)
                {
                        if (is_object($ilUser))
                        {
                                //$this->meta_data->setLanguage($ilUser->getLanguage());
                        }
                        $this->initMeta();
                        $this->meta_data->setId($this->getId());
                        $this->meta_data->setType($this->getType());
                        $this->meta_data->setTitle($this->getTitle());
                        $this->meta_data->setDescription($this->getDescription());
                        $this->meta_data->setObject($this);
                        $this->meta_data->create();
                }
        }

        function initDefaultRoles()
        {
                return array();

                global $rbacadmin, $rbacreview;

                // create a local role folder
                $rfoldObj = $this->createRoleFolder("Local roles","Role Folder of content object ".$this->getId());

                // note: we don't need any roles here, local "author" roles must
                // be created manually. subscription roles have been abandoned.
                /*
                // create author role and assign role to rolefolder...
                $roleObj = $rfoldObj->createRole("author object ".$this->getRefId(),"author of content object ref id ".$this->getRefId());
                $roles[] = $roleObj->getId();

                // copy permissions from author template to new role
                $rbacadmin->copyRolePermission($this->getAuthorRoleTemplateId(), 8, $rfoldObj->getRefId(), $roleObj->getId());

                // grant all allowed operations of role to current learning module
                $rbacadmin->grantPermission($roleObj->getId(),
                        $rbacreview->getOperationsOfRole($roleObj->getId(), "lm", $rfoldObj->getRefId()),
                        $this->getRefId());*/

                unset($rfoldObj);
                //unset($roleObj);

                return $roles ? $roles : array();
        }


        function read()
        {
                parent::read();
#               echo "Content<br>\n";

                $this->lm_tree = new ilTree($this->getId());
                $this->lm_tree->setTableNames('lm_tree','lm_data');
                $this->lm_tree->setTreeTablePK("lm_id");

                $this->readProperties();
                //parent::read();
        }

        function getTitle()
        {
                return parent::getTitle();
        }

        function setTitle($a_title)
        {
                parent::setTitle($a_title);
                $this->meta_data->setTitle($a_title);
        }

        function getDescription()
        {
                return parent::getDescription();
        }

        function setDescription($a_description)
        {
                parent::setDescription($a_description);
                $this->meta_data->setDescription($a_description);
        }

        function assignMetaData(&$a_meta_data)
        {
                $this->meta_data =& $a_meta_data;
        }

        function &getMetaData()
        {
                $this->initMeta();
                return $this->meta_data;
        }


        function updateMetaData()
        {
                $this->initMeta();
                $this->meta_data->update();
                if ($this->meta_data->section != "General")
                {
                        $meta = $this->meta_data->getElement("Title", "General");
                        $this->meta_data->setTitle($meta[0]["value"]);
                        $meta = $this->meta_data->getElement("Description", "General");
                        $this->meta_data->setDescription($meta[0]["value"]);
                }
                else
                {
                        $this->setTitle($this->meta_data->getTitle());
                        $this->setDescription($this->meta_data->getDescription());
                }
                parent::update();
        }

        function getImportId()
        {
                $this->initMeta();
                return $this->meta_data->getImportIdentifierEntryID();
        }

        function setImportId($a_id)
        {
                $this->initMeta();
                $this->meta_data->setImportIdentifierEntryID($a_id);
        }

        function &getTree()
        {
                return $this->lm_tree;
        }

        function update()
        {
                $this->updateMetaData();
                $this->updateProperties();
        }


        function import()
        {
                // nothing to do. just display the dialogue in Out
                return;
        }


        function putInTree($a_parent)
        {
                global $tree;

                // put this object in tree under $a_parent
                parent::putInTree($a_parent);

                // make new tree for this object
                //$tree->addTree($this->getId());
        }


        function createLMTree()
        {
                $this->lm_tree =& new ilTree($this->getId());
                $this->lm_tree->setTreeTablePK("lm_id");
                $this->lm_tree->setTableNames('lm_tree','lm_data');
                $this->lm_tree->addTree($this->getId(), 1);
        }


        function &getLMTree()
        {
                return $this->lm_tree;
        }


        function createImportDirectory()
        {
                $lm_data_dir = ilUtil::getDataDir()."/lm_data";
                if(!is_writable($lm_data_dir))
                {
                        $this->ilias->raiseError("Content object Data Directory (".$lm_data_dir
                                .") not writeable.",$this->ilias->error_obj->FATAL);
                }

                // create learning module directory (data_dir/lm_data/lm_<id>)
                $lm_dir = $lm_data_dir."/lm_".$this->getId();
                ilUtil::makeDir($lm_dir);
                if(!@is_dir($lm_dir))
                {
                        $this->ilias->raiseError("Creation of Learning Module Directory failed.",$this->ilias->error_obj->FATAL);
                }

                // create import subdirectory (data_dir/lm_data/lm_<id>/import)
                $import_dir = $lm_dir."/import";
                ilUtil::makeDir($import_dir);
                if(!@is_dir($import_dir))
                {
                        $this->ilias->raiseError("Creation of Import Directory failed.",$this->ilias->error_obj->FATAL);
                }
        }

        function getDataDirectory()
        {
                return ilUtil::getDataDir()."/lm_data".
                        "/lm_".$this->getId();
        }

        function getImportDirectory()
        {
                $import_dir = ilUtil::getDataDir()."/lm_data".
                        "/lm_".$this->getId()."/import";
                if(@is_dir($import_dir))
                {
                        return $import_dir;
                }
                else
                {
                        return false;
                }
        }


        function createExportDirectory($a_type = "xml")
        {
                $lm_data_dir = ilUtil::getDataDir()."/lm_data";
                if(!is_writable($lm_data_dir))
                {
                        $this->ilias->raiseError("Content object Data Directory (".$lm_data_dir
                                .") not writeable.",$this->ilias->error_obj->FATAL);
                }
                // create learning module directory (data_dir/lm_data/lm_<id>)
                $lm_dir = $lm_data_dir."/lm_".$this->getId();
                ilUtil::makeDir($lm_dir);
                if(!@is_dir($lm_dir))
                {
                        $this->ilias->raiseError("Creation of Learning Module Directory failed.",$this->ilias->error_obj->FATAL);
                }
                // create Export subdirectory (data_dir/lm_data/lm_<id>/Export)
                switch ($a_type)
                {
                        // html
                        case "html":
                                $export_dir = $lm_dir."/export_html";
                                break;
                                
                        default:                // = xml
                                $export_dir = $lm_dir."/export";
                                break;
                }
                ilUtil::makeDir($export_dir);
                if(!@is_dir($export_dir))
                {
                        $this->ilias->raiseError("Creation of Export Directory failed.",$this->ilias->error_obj->FATAL);
                }
        }

        function getExportDirectory($a_type = "xml")
        {
                switch  ($a_type)
                {
                        case "html":
                                $export_dir = ilUtil::getDataDir()."/lm_data"."/lm_".$this->getId()."/export_html";
                                break;
                                
                        default:                        // = xml
                                $export_dir = ilUtil::getDataDir()."/lm_data"."/lm_".$this->getId()."/export";
                                break;
                }
                return $export_dir;
        }

        function ilClone($a_parent_ref)
        {
                global $rbacadmin;

                // always call parent ilClone function first!!
                $new_ref_id = parent::ilClone($a_parent_ref);

                // todo: put here lm specific stuff

                // ... and finally always return new reference ID!!
                return $new_ref_id;
        }

        function delete()
        {
                global $ilDB;

                global $ilBench;

                #$ilBench->start('NestedSet','lm_delete');

                // always call parent delete function first!!
                if (!parent::delete())
                {
                        return false;
                }

                #$ilBench->start('NestedSet','delete_all_object_data');
                // delete lm object data
                include_once("content/classes/class.ilLMObject.php");
                ilLMObject::_deleteAllObjectData($this);
                #$ilBench->stop('NestedSet','delete_all_object_data');


                // delete meta data of content object
                $nested = new ilNestedSetXML();
                $nested->init($this->getId(), $this->getType());
                $nested->deleteAllDBData();
                

                // delete bibitem data
                $nested = new ilNestedSetXML();
                $nested->init($this->getId(), "bib");
                $nested->deleteAllDBData();

                
                // delete learning module tree
                $this->lm_tree->removeTree($this->lm_tree->getTreeId());

                // delete data directory
                ilUtil::delDir($this->getDataDirectory());

                // delete content object record
                $q = "DELETE FROM content_object WHERE id = ".$ilDB->quote($this->getId());
                $this->ilias->db->query($q);

                // delete lm menu entries
                $q = "DELETE FROM lm_menu WHERE lm_id = ".$ilDB->quote($this->getId());
                $this->ilias->db->query($q);

                #$ilBench->stop('NestedSet','lm_delete');
                #$ilBench->save();
        
                return true;
        }

        function getLayout()
        {
                return $this->layout;
        }

        function setLayout($a_layout)
        {
                $this->layout = $a_layout;
        }

        function getStyleSheetId()
        {
                return $this->style_id;
        }

        function setStyleSheetId($a_style_id)
        {
                $this->style_id = $a_style_id;
        }

        function writeStyleSheetId($a_style_id)
        {
                global $ilDB;
                
                $q = "UPDATE content_object SET ".
                        " stylesheet = ".$ilDB->quote($a_style_id).
                        " WHERE id = '".$this->getId()."'";
                $ilDB->query($q);

                $this->style_id = $a_style_id;
        }

        function _lookupStyleSheetId($a_cont_obj_id)
        {
                global $ilDB;
                
                $q = "SELECT stylesheet FROM content_object ".
                        " WHERE id = '".$a_cont_obj_id."'";
                $res = $ilDB->query($q);
                $sheet = $res->fetchRow(DB_FETCHMODE_ASSOC);

                return $sheet["stylesheet"];
        }

        function getPageHeader()
        {
                return $this->pg_header;
        }

        function setPageHeader($a_pg_header = IL_CHAPTER_TITLE)
        {
                $this->pg_header = $a_pg_header;
        }

        function getTOCMode()
        {
                return $this->toc_mode;
        }
        
        function getPublicAccessMode()
        {
                return $this->public_access_mode;
        }

        function setTOCMode($a_toc_mode = "chapters")
        {
                $this->toc_mode = $a_toc_mode;
        }

        function setOnline($a_online)
        {
                $this->online = $a_online;
        }

        function getOnline()
        {
                return $this->online;
        }

        function setActiveLMMenu($a_act_lm_menu)
        {
                $this->lm_menu_active = $a_act_lm_menu;
        }

        function isActiveLMMenu()
        {
                return $this->lm_menu_active;
        }

        function setActiveTOC($a_toc)
        {
                $this->toc_active = $a_toc;
        }

        function isActiveTOC()
        {
                return $this->toc_active;
        }

        function setActiveNumbering($a_num)
        {
                $this->numbering = $a_num;
        }

        function isActiveNumbering()
        {
                return $this->numbering;
        }

        function setActivePrintView($a_print)
        {
                $this->print_view_active = $a_print;
        }

        function isActivePrintView()
        {
                return $this->print_view_active;
        }

        function setActiveDownloads($a_down)
        {
                $this->downloads_active = $a_down;
        }

        function isActiveDownloads()
        {
                return $this->downloads_active;
        }

        function setCleanFrames($a_clean)
        {
                $this->clean_frames = $a_clean;
        }

        function cleanFrames()
        {
                return $this->clean_frames;
        }
        
        function setHistoryUserComments($a_comm)
        {
                $this->user_comments = $a_comm;
        }

        function setPublicAccessMode($a_mode)
        {
                $this->public_access_mode = $a_mode;
        }

        function isActiveHistoryUserComments()
        {
                return $this->user_comments;
        }

        function readProperties()
        {
                $q = "SELECT * FROM content_object WHERE id = '".$this->getId()."'";
                $lm_set = $this->ilias->db->query($q);
                $lm_rec = $lm_set->fetchRow(DB_FETCHMODE_ASSOC);
                $this->setLayout($lm_rec["default_layout"]);
                $this->setStyleSheetId($lm_rec["stylesheet"]);
                $this->setPageHeader($lm_rec["page_header"]);
                $this->setTOCMode($lm_rec["toc_mode"]);
                $this->setOnline(ilUtil::yn2tf($lm_rec["online"]));
                $this->setActiveTOC(ilUtil::yn2tf($lm_rec["toc_active"]));
                $this->setActiveNumbering(ilUtil::yn2tf($lm_rec["numbering"]));
                $this->setActivePrintView(ilUtil::yn2tf($lm_rec["print_view_active"]));
                $this->setActiveDownloads(ilUtil::yn2tf($lm_rec["downloads_active"]));
                $this->setActiveLMMenu(ilUtil::yn2tf($lm_rec["lm_menu_active"]));
                $this->setCleanFrames(ilUtil::yn2tf($lm_rec["clean_frames"]));
                $this->setHistoryUserComments(ilUtil::yn2tf($lm_rec["hist_user_comments"]));
                $this->setPublicAccessMode($lm_rec["public_access_mode"]);
                $this->setPublicExportFile("xml", $lm_rec["public_xml_file"]);
                $this->setPublicExportFile("html", $lm_rec["public_html_file"]);
        }

        function updateProperties()
        {
                $q = "UPDATE content_object SET ".
                        " default_layout = '".$this->getLayout()."', ".
                        " stylesheet = '".$this->getStyleSheetId()."',".
                        " page_header = '".$this->getPageHeader()."',".
                        " toc_mode = '".$this->getTOCMode()."',".
                        " online = '".ilUtil::tf2yn($this->getOnline())."',".
                        " toc_active = '".ilUtil::tf2yn($this->isActiveTOC())."',".
                        " numbering = '".ilUtil::tf2yn($this->isActiveNumbering())."',".
                        " print_view_active = '".ilUtil::tf2yn($this->isActivePrintView())."',".
                        " downloads_active = '".ilUtil::tf2yn($this->isActiveDownloads())."',".
                        " clean_frames = '".ilUtil::tf2yn($this->cleanFrames())."',".
                        " hist_user_comments = '".ilUtil::tf2yn($this->isActiveHistoryUserComments())."',".
                        " public_access_mode = '".$this->getPublicAccessMode()."',".
                        " public_xml_file = '".$this->getPublicExportFile("xml")."',".
                        " public_html_file = '".$this->getPublicExportFile("html")."',".
                        " lm_menu_active = '".ilUtil::tf2yn($this->isActiveLMMenu())."'".
                        " WHERE id = '".$this->getId()."'";
                $this->ilias->db->query($q);
        }

        function createProperties()
        {
                $q = "INSERT INTO content_object (id) VALUES ('".$this->getId()."')";
                $this->ilias->db->query($q);
                $this->readProperties();                // to get db default values
        }

        function _lookupOnline($a_id)
        {
                $q = "SELECT * FROM content_object WHERE id = '".$a_id."'";
                $lm_set = $this->ilias->db->query($q);
                $lm_rec = $lm_set->fetchRow(DB_FETCHMODE_ASSOC);

                return ilUtil::yn2tf($lm_rec["online"]);
        }

        function getAvailableLayouts()
        {
                // read sdir, copy files and copy directories recursively
                $dir = opendir("./layouts/lm");

                $layouts = array();

                while($file = readdir($dir))
                {
                        if ($file != "." && $file != ".." && $file != "CVS")
                        {
                                // directories
                                if (@is_dir("./layouts/lm/".$file))
                                {
                                        $layouts[$file] = $file;
                                }
                        }
                }
                asort($layouts);
                return $layouts;
        }

        function _checkPreconditionsOfPage($cont_obj_id, $page_id)
        {
                global $ilias,$ilUser,$ilErr;

                $lm_tree = new ilTree($cont_obj_id);
                $lm_tree->setTableNames('lm_tree','lm_data');
                $lm_tree->setTreeTablePK("lm_id");

                if ($lm_tree->isInTree($page_id))
                {
                        $path = $lm_tree->getPathFull($page_id, $lm_tree->readRootId());
                        foreach ($path as $node)
                        {
                                if ($node["type"] == "st")
                                {
                                        if (!ilConditionHandler::_checkAllConditionsOfTarget($node["child"], "st"))
                                        {
                                                return false;
                                        }
                                }
                        }
                }
                
                return true;
        }

        function _getMissingPreconditionsOfPage($cont_obj_id, $page_id)
        {
                $lm_tree = new ilTree($cont_obj_id);
                $lm_tree->setTableNames('lm_tree','lm_data');
                $lm_tree->setTreeTablePK("lm_id");

                $conds = array();
                if ($lm_tree->isInTree($page_id))
                {
                        // get full path of page
                        $path = $lm_tree->getPathFull($page_id, $lm_tree->readRootId());
                        foreach ($path as $node)
                        {
                                if ($node["type"] == "st")
                                {
                                        // get all preconditions of upper chapters
                                        $tconds = ilConditionHandler::_getConditionsOfTarget($node["child"], "st");
                                        foreach ($tconds as $tcond)
                                        {
                                                // store all missing preconditions
                                                if (!ilConditionHandler::_checkCondition($tcond["id"]))
                                                {
                                                        $conds[] = $tcond;
                                                }
                                        }
                                }
                        }
                }
                
                return $conds;
        }

        function _getMissingPreconditionsTopChapter($cont_obj_id, $page_id)
        {
                $lm_tree = new ilTree($cont_obj_id);
                $lm_tree->setTableNames('lm_tree','lm_data');
                $lm_tree->setTreeTablePK("lm_id");

                $conds = array();
                if ($lm_tree->isInTree($page_id))
                {
                        // get full path of page
                        $path = $lm_tree->getPathFull($page_id, $lm_tree->readRootId());
                        foreach ($path as $node)
                        {
                                if ($node["type"] == "st")
                                {
                                        // get all preconditions of upper chapters
                                        $tconds = ilConditionHandler::_getConditionsOfTarget($node["child"], "st");
                                        foreach ($tconds as $tcond)
                                        {
                                                // look for missing precondition
                                                if (!ilConditionHandler::_checkCondition($tcond["id"]))
                                                {
                                                        return $node["child"];
                                                }
                                        }
                                }
                        }
                }
                
                return "";
        }

        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>",$a_params,"</pre>");
                                //echo "Content Object ".$this->getRefId()." triggered by link event. Objects linked into target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                        
                        case "cut":
                                
                                //echo "Content Object ".$this->getRefId()." triggered by cut event. Objects are removed from target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                                
                        case "copy":
                        
                                //var_dump("<pre>",$a_params,"</pre>");
                                //echo "Content Object ".$this->getRefId()." triggered by copy event. Objects are copied into target object ref_id: ".$a_ref_id;
                                //exit;
                                break;

                        case "paste":
                                
                                //echo "Content Object ".$this->getRefId()." triggered by paste (cut) event. Objects are pasted into target object ref_id: ".$a_ref_id;
                                //exit;
                                break;
                        
                        case "new":
                                
                                //echo "Content Object ".$this->getRefId()." triggered by paste (new) event. Objects are applied to target object ref_id: ".$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 _search(&$search_obj,$a_search_in)
        {
                global $ilBench;

                switch($a_search_in)
                {
                        case 'meta':
                                // FILTER ALL DBK OBJECTS
                                $in             = $search_obj->getInStatement("r.ref_id");
                                $where  = $search_obj->getWhereCondition("fulltext",array("xv.tag_value"));

                                /* very slow on mysql < 4.0.18 (? or everytime ?)
                                $query = "SELECT DISTINCT(r.ref_id) FROM object_reference AS r,object_data AS o, ".
                                        "lm_data AS l,xmlnestedset AS xm,xmlvalue AS xv ".
                                        $where.
                                        $in.
                                        "AND r.obj_id=o.obj_id AND ((o.obj_id=l.lm_id AND xm.ns_book_fk=l.obj_id) OR ".
                                        "(o.obj_id=xm.ns_book_fk AND xm.ns_type IN ('lm','bib'))) ".
                                        "AND xm.ns_tag_fk=xv.tag_fk ".
                                        "AND o.type= 'lm'";*/

                                $query1 = "SELECT DISTINCT(r.ref_id) FROM object_reference AS r,object_data AS o, ".
                                        "xmlnestedset AS xm,xmlvalue AS xv ".
                                        $where.
                                        $in.
                                        "AND r.obj_id=o.obj_id AND ( ".
                                        "(o.obj_id=xm.ns_book_fk AND xm.ns_type IN ('lm','bib'))) ".
                                        "AND xm.ns_tag_fk=xv.tag_fk ".
                                        "AND o.type= 'lm'";

                                // BEGINNING SELECT WITH SEARCH RESULTS IS MUCH FASTER
                                $query1 = "SELECT DISTINCT(r.ref_id) as ref_id FROM xmlvalue AS xv ".
                                        "LEFT JOIN xmlnestedset AS xm ON xm.ns_tag_fk=xv.tag_fk ".
                                        "LEFT JOIN object_data AS o ON o.obj_id = xm.ns_book_fk ".
                                        "LEFT JOIN object_reference AS r ON o.obj_id = r.obj_id ".
                                        $where.
                                        $in.
                                        " AND o.type = 'lm' AND xm.ns_type IN ('lm','bib')";

                                $query2 = "SELECT DISTINCT(r.ref_id) FROM object_reference AS r,object_data AS o, ".
                                        "lm_data AS l,xmlnestedset AS xm,xmlvalue AS xv ".
                                        $where.
                                        $in.
                                        "AND r.obj_id=o.obj_id AND ((o.obj_id=l.lm_id AND xm.ns_book_fk=l.obj_id)".
                                        ") ".
                                        "AND xm.ns_tag_fk=xv.tag_fk ".
                                        "AND o.type= 'lm'";

                                $query2 = "SELECT DISTINCT(r.ref_id) as ref_id FROM xmlvalue AS xv ".
                                        "LEFT JOIN xmlnestedset AS xm ON xm.ns_tag_fk = xv.tag_fk ".
                                        "LEFT JOIN lm_data AS l ON l.obj_id = xm.ns_book_fk ".
                                        "LEFT JOIN object_data AS o ON o.obj_id = l.lm_id ".
                                        "LEFT JOIN object_reference AS r ON r.obj_id = o.obj_id ".
                                        $where.
                                        $in.
                                        "AND o.type = 'lm'";

                                $ilBench->start("Search", "ilObjContentObject_search_meta");
                                $res1 = $search_obj->ilias->db->query($query1);
                                $res2 = $search_obj->ilias->db->query($query2);
                                $ilBench->stop("Search", "ilObjContentObject_search_meta");

                                $counter = 0;
                                $ids = array();
                                while($row = $res1->fetchRow(DB_FETCHMODE_OBJECT))
                                {
                                        $ids[] = $row->ref_id;
                                        $result[$counter]["id"]         =  $row->ref_id;
                                        ++$counter;
                                }
                                while($row = $res2->fetchRow(DB_FETCHMODE_OBJECT))
                                {
                                        if(in_array($row->ref_id,$ids))
                                        {
                                                continue;
                                        }
                                        $result[$counter]["id"]         =  $row->ref_id;
                                        ++$counter;
                                }
                                break;

                        case 'content':
                                $in             = $search_obj->getInStatement("r.ref_id");
                                $where  = $search_obj->getWhereCondition("fulltext",array("pg.content"));

                                // slow on mysql < 4.0.18 (join bug)
                                /*
                                $query = "SELECT DISTINCT(r.ref_id) AS ref_id ,pg.page_id AS page_id FROM page_object AS pg ".
                                        "INNER JOIN object_reference AS r ON pg.parent_id = r.obj_id ".
                                        $where.
                                        $in.
                                        "AND pg.parent_type = 'lm' ";*/

                                $query = "SELECT DISTINCT(r.ref_id) AS ref_id ,pg.page_id AS page_id FROM page_object AS pg ".
                                        ", object_reference AS r ".
                                        $where.
                                        " AND pg.parent_id = r.obj_id ".
                                        $in.
                                        " AND pg.parent_type = 'lm' ";

                                $query = "SELECT DISTINCT(r.ref_id) AS ref_id ,pg.page_id AS page_id FROM page_object AS pg ".
                                        "LEFT JOIN object_data AS o ON o.obj_id = pg.parent_id ".
                                        "LEFT JOIN object_reference AS r ON o.obj_id = r.obj_id ".
                                        $where.
                                        $in.
                                        " AND pg.parent_type = 'lm'";

                                $ilBench->start("Search", "ilObjContentObject_search_content");
                                $res = $search_obj->ilias->db->query($query);
                                $ilBench->stop("Search", "ilObjContentObject_search_content");

                                $counter = 0;
                                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                                {
                                        $result[$counter]["id"]         = $row->ref_id;
                                        $result[$counter]["page_id"] = $row->page_id;
                                        /*
                                        $result[$counter]["link"]       = "content/lm_presentation.php?ref_id=".$row->ref_id;
                                        $result[$counter]["target"]     = "_top";
                                        */
                                        ++$counter;
                                }
                                break;
                }
                return $result ? $result : array();
        }

        function _getLinkToObject($a_ref_id,$a_type,$a_obj_id = 0)
        {
                switch($a_type)
                {
                        case "content":
                                return array("content/lm_presentation.php?ref_id=".$a_ref_id."&obj_id=".$a_obj_id,"_blank");
                                
                        case "meta":
                                return array("content/lm_presentation.php?ref_id=".$a_ref_id,"_blank");
                }
        }

        function _goto($a_target)
        {
                global $rbacsystem, $ilErr, $lng;

                if ($rbacsystem->checkAccess("read", $a_target))
                {
                        ilUtil::redirect("content/lm_presentation.php?ref_id=$a_target");
                }
                else
                {
                        $ilErr->raiseError($lng->txt("msg_no_perm_read_lm"), $ilErr->FATAL);
                }
        }
        
        function hasSuccessorPage($a_cont_obj_id, $a_page_id)
        {
                $tree = new ilTree($a_cont_obj_id);
                $tree->setTableNames('lm_tree','lm_data');
                $tree->setTreeTablePK("lm_id");
                if ($tree->isInTree($a_page_id))
                {
                        $succ = $tree->fetchSuccessorNode($a_page_id, "pg");
                        if ($succ > 0)
                        {
                                return true;
                        }
                }
                return false;
        }

        
        function checkTree()
        {
                $tree = new ilTree($this->getId());
                $tree->setTableNames('lm_tree','lm_data');
                $tree->setTreeTablePK("lm_id");
                $tree->checkTree();
                $tree->checkTreeChilds();
//echo "checked";
        }

        function fixTree()
        {
                global $ilDB;

                $tree =& $this->getLMTree();

                $nodes = $tree->getSubtree($tree->getNodeData($tree->getRootId()));
                foreach ($nodes as $node)
                {
                        $q = "SELECT * FROM lm_data WHERE obj_id = ".$ilDB->quote($node["child"]);
                        $obj_set = $ilDB->query($q);
                        $obj_rec = $obj_set->fetchRow(DB_FETCHMODE_ASSOC);
                        if (!$obj_rec)
                        {
                                $node_data = $tree->getNodeData($node["child"]);
                                $tree->deleteTree($node_data);
                        }
                }
        }


        function exportXML(&$a_xml_writer, $a_inst, $a_target_dir, &$expLog)
        {
                global $ilBench;

                $attrs = array();
                switch($this->getType())
                {
                        case "lm":
                                $attrs["Type"] = "LearningModule";
                                break;

                        case "dbk":
                                $attrs["Type"] = "LibObject";
                                break;
                }
                $a_xml_writer->xmlStartTag("ContentObject", $attrs);

                // MetaData
                $this->exportXMLMetaData($a_xml_writer);

                // StructureObjects
//echo "ContObj:".$a_inst.":<br>";
                $expLog->write(date("[y-m-d H:i:s] ")."Start Export Structure Objects");
                $ilBench->start("ContentObjectExport", "exportStructureObjects");
                $this->exportXMLStructureObjects($a_xml_writer, $a_inst, $expLog);
                $ilBench->stop("ContentObjectExport", "exportStructureObjects");
                $expLog->write(date("[y-m-d H:i:s] ")."Finished Export Structure Objects");

                // PageObjects
                $expLog->write(date("[y-m-d H:i:s] ")."Start Export Page Objects");
                $ilBench->start("ContentObjectExport", "exportPageObjects");
                $this->exportXMLPageObjects($a_xml_writer, $a_inst, $expLog);
                $ilBench->stop("ContentObjectExport", "exportPageObjects");
                $expLog->write(date("[y-m-d H:i:s] ")."Finished Export Page Objects");

                // MediaObjects
                $expLog->write(date("[y-m-d H:i:s] ")."Start Export Media Objects");
                $ilBench->start("ContentObjectExport", "exportMediaObjects");
                $this->exportXMLMediaObjects($a_xml_writer, $a_inst, $a_target_dir, $expLog);
                $ilBench->stop("ContentObjectExport", "exportMediaObjects");
                $expLog->write(date("[y-m-d H:i:s] ")."Finished Export Media Objects");

                // FileItems
                $expLog->write(date("[y-m-d H:i:s] ")."Start Export File Items");
                $ilBench->start("ContentObjectExport", "exportFileItems");
                $this->exportFileItems($a_target_dir, $expLog);
                $ilBench->stop("ContentObjectExport", "exportFileItems");
                $expLog->write(date("[y-m-d H:i:s] ")."Finished Export File Items");

                // Glossary
                // not implemented

                // Bibliography
                // not implemented

                // Layout
                // not implemented

                $a_xml_writer->xmlEndTag("ContentObject");
        }

        function exportXMLMetaData(&$a_xml_writer)
        {
                $nested = new ilNestedSetXML();
                $nested->setParameterModifier($this, "modifyExportIdentifier");
                $a_xml_writer->appendXML($nested->export($this->getId(),
                        $this->getType()));
        }

        function modifyExportIdentifier($a_tag, $a_param, $a_value)
        {
                if ($a_tag == "Identifier" && $a_param == "Entry")
                {
                        $a_value = ilUtil::insertInstIntoID($a_value);
                }

                return $a_value;
        }

        function exportXMLStructureObjects(&$a_xml_writer, $a_inst, &$expLog)
        {
                include_once './content/classes/class.ilStructureObject.php';

                $childs = $this->lm_tree->getChilds($this->lm_tree->getRootId());
                foreach ($childs as $child)
                {
                        if($child["type"] != "st")
                        {
                                continue;
                        }

                        $structure_obj = new ilStructureObject($this, $child["obj_id"]);
                        $structure_obj->exportXML($a_xml_writer, $a_inst, $expLog);
                        unset($structure_obj);
                }
        }


        function exportXMLPageObjects(&$a_xml_writer, $a_inst, &$expLog)
        {
                global $ilBench;

                include_once "./content/classes/class.ilLMPageObject.php";

                $pages = ilLMPageObject::getPageList($this->getId());
                foreach ($pages as $page)
                {
                        $ilBench->start("ContentObjectExport", "exportPageObject");
                        $expLog->write(date("[y-m-d H:i:s] ")."Page Object ".$page["obj_id"]);

                        // export xml to writer object
                        $ilBench->start("ContentObjectExport", "exportPageObject_getLMPageObject");
                        $page_obj = new ilLMPageObject($this, $page["obj_id"]);
                        $ilBench->stop("ContentObjectExport", "exportPageObject_getLMPageObject");
                        $ilBench->start("ContentObjectExport", "exportPageObject_XML");
                        $page_obj->exportXML($a_xml_writer, "normal", $a_inst);
                        $ilBench->stop("ContentObjectExport", "exportPageObject_XML");

                        // collect media objects
                        $ilBench->start("ContentObjectExport", "exportPageObject_CollectMedia");
                        $mob_ids = $page_obj->getMediaObjectIDs();
                        foreach($mob_ids as $mob_id)
                        {
                                $this->mob_ids[$mob_id] = $mob_id;
                        }
                        $ilBench->stop("ContentObjectExport", "exportPageObject_CollectMedia");

                        // collect all file items
                        $ilBench->start("ContentObjectExport", "exportPageObject_CollectFileItems");
                        $file_ids = $page_obj->getFileItemIds();
                        foreach($file_ids as $file_id)
                        {
                                $this->file_ids[$file_id] = $file_id;
                        }
                        $ilBench->stop("ContentObjectExport", "exportPageObject_CollectFileItems");

                        unset($page_obj);

                        $ilBench->stop("ContentObjectExport", "exportPageObject");
                }
        }

        function exportXMLMediaObjects(&$a_xml_writer, $a_inst, $a_target_dir, &$expLog)
        {
                include_once("content/classes/Media/class.ilObjMediaObject.php");

                foreach ($this->mob_ids as $mob_id)
                {
                        $expLog->write(date("[y-m-d H:i:s] ")."Media Object ".$mob_id);
                        $media_obj = new ilObjMediaObject($mob_id);
                        $media_obj->exportXML($a_xml_writer, $a_inst);
                        $media_obj->exportFiles($a_target_dir);
                        unset($media_obj);
                }
        }

        function exportFileItems($a_target_dir, &$expLog)
        {
                include_once("classes/class.ilObjFile.php");

                foreach ($this->file_ids as $file_id)
                {
                        $expLog->write(date("[y-m-d H:i:s] ")."File Item ".$file_id);
                        $file_obj = new ilObjFile($file_id, false);
                        $file_obj->export($a_target_dir);
                        unset($file_obj);
                }
        }

        function getExportFiles()
        {
                $file = array();
                
                $types = array("xml", "html");
                
                foreach ($types as $type)
                {
                        $dir = $this->getExportDirectory($type);
                        // quit if import dir not available
                        if (!@is_dir($dir) or
                                !is_writeable($dir))
                        {
                                continue;
                        }
        
                        // open directory
                        $cdir = dir($dir);
        
                        // initialize array
        
                        // get files and save the in the array
                        while ($entry = $cdir->read())
                        {
                                if ($entry != "." and
                                        $entry != ".." and
                                        substr($entry, -4) == ".zip" and
                                        ereg("^[0-9]{10}_{2}[0-9]+_{2}(lm_)*[0-9]+\.zip\$", $entry))
                                {
                                        $file[$entry.$type] = array("type" => $type, "file" => $entry,
                                                "size" => filesize($dir."/".$entry));
                                }
                        }
        
                        // close import directory
                        $cdir->close();
                }

                // sort files
                ksort ($file);
                reset ($file);

                return $file;
        }
        
        function setPublicExportFile($a_type, $a_file)
        {
                $this->public_export_file[$a_type] = $a_file;
        }

        function getPublicExportFile($a_type)
        {
                return $this->public_export_file[$a_type];
        }

        function getOfflineFiles($dir)
        {
                // quit if offline dir not available
                if (!@is_dir($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 != "." and
                                $entry != ".." and
                                substr($entry, -4) == ".pdf" and
                                ereg("^[0-9]{10}_{2}[0-9]+_{2}(lm_)*[0-9]+\.pdf\$", $entry))
                        {
                                $file[] = $entry;
                        }
                }

                // close import directory
                $dir->close();

                // sort files
                sort ($file);
                reset ($file);

                return $file;
        }
        
        function exportHTML($a_target_dir, $log)
        {
                global $ilias, $tpl;

                // initialize temporary target directory
                ilUtil::delDir($a_target_dir);
                ilUtil::makeDir($a_target_dir);
                $mob_dir = $a_target_dir."/mobs";
                ilUtil::makeDir($mob_dir);
                $file_dir = $a_target_dir."/files";
                ilUtil::makeDir($file_dir);

                // export system style sheet
                $location_stylesheet = ilUtil::getStyleSheetLocation("filesystem");
                $style_name = $ilias->account->prefs["style"].".css";
                copy($location_stylesheet, $a_target_dir."/".$style_name);
                $location_stylesheet = ilUtil::getStyleSheetLocation();
                
                // export content style sheet
                if ($this->getStyleSheetId() < 1)
                {
                        $cont_stylesheet = "content/content.css";
                        copy($cont_stylesheet, $a_target_dir."/content.css");
                }
                else
                {
                        $style = new ilObjStyleSheet($this->getStyleSheetId());
                        $style->writeCSSFile($a_target_dir."/content.css");
                }
                
                // export syntax highlighting style
                $syn_stylesheet = "content/syntaxhighlight.css";
                copy($syn_stylesheet, $a_target_dir."/syntaxhighlight.css");

                // get learning module presentation gui class
                include_once("content/classes/class.ilLMPresentationGUI.php");
                $_GET["cmd"] = "nop";
                $lm_gui =& new ilLMPresentationGUI();
                $lm_gui->setOfflineMode(true);

                // export pages
                $this->exportHTMLPages($lm_gui, $a_target_dir);
                
                // export glossary terms
                $this->exportHTMLGlossaryTerms($lm_gui, $a_target_dir);
                
                // export all media objects
                foreach ($this->offline_mobs as $mob)
                {
                        $this->exportHTMLMOB($a_target_dir, $lm_gui, $mob, "_new");
                }
                $_GET["obj_type"]  = "MediaObject";
                $_GET["obj_id"]  = $a_mob_id;
                $_GET["cmd"] = "";
                
                // export all file objects
                foreach ($this->offline_files as $file)
                {
                        $this->exportHTMLFile($a_target_dir, $file);
                }
                
                // export table of contents
                if ($this->isActiveTOC())
                {
                        $tpl = new ilTemplate("tpl.main.html", true, true);
                        //$tpl->addBlockFile("CONTENT", "content", "tpl.adm_content.html");
                        $content =& $lm_gui->showTableOfContents();
                        $file = $a_target_dir."/table_of_contents.html";
                                
                        // open file
                        if (!($fp = @fopen($file,"w+")))
                        {
                                die ("<b>Error</b>: Could not open \"".$file."\" for writing".
                                        " in <b>".__FILE__."</b> on line <b>".__LINE__."</b><br />");
                        }
                        chmod($file, 0770);
                        fwrite($fp, $content);
                        fclose($fp);
                }

                // export images
                $image_dir = $a_target_dir."/images";
                ilUtil::makeDir($image_dir);
                ilUtil::makeDir($image_dir."/browser");
                copy(ilUtil::getImagePath("enlarge.gif", false, "filesystem"),
                        $image_dir."/enlarge.gif");
                copy(ilUtil::getImagePath("browser/blank.gif", false, "filesystem"),
                        $image_dir."/browser/plus.gif");
                copy(ilUtil::getImagePath("browser/blank.gif", false, "filesystem"),
                        $image_dir."/browser/minus.gif");
                copy(ilUtil::getImagePath("browser/blank.gif", false, "filesystem"),
                        $image_dir."/browser/blank.gif");
                copy(ilUtil::getImagePath("icon_st.gif", false, "filesystem"),
                        $image_dir."/icon_st.gif");
                copy(ilUtil::getImagePath("icon_pg.gif", false, "filesystem"),
                        $image_dir."/icon_pg.gif");
                copy(ilUtil::getImagePath("nav_arr_L.gif", false, "filesystem"),
                        $image_dir."/nav_arr_L.gif");
                copy(ilUtil::getImagePath("nav_arr_R.gif", false, "filesystem"),
                        $image_dir."/nav_arr_R.gif");
                        
                // template workaround: reset of template 
                $tpl = new ilTemplate("tpl.main.html", true, true);
                $tpl->setVariable("LOCATION_STYLESHEET",$location_stylesheet);
                $tpl->addBlockFile("CONTENT", "content", "tpl.adm_content.html");
                
                // zip it all
                $date = time();
                $zip_file = $this->getExportDirectory("html")."/".$date."__".IL_INST_ID."__".
                        $this->getType()."_".$this->getId().".zip";
//echo "zip-".$a_target_dir."-to-".$zip_file;
                ilUtil::zip($a_target_dir, $zip_file);
                ilUtil::delDir($a_target_dir);
        }
        
        function exportHTMLFile($a_target_dir, $a_file_id)
        {
                $file_dir = $a_target_dir."/files/file_".$a_file_id;
                ilUtil::makeDir($file_dir);
                include_once("classes/class.ilObjFile.php");
                $file_obj = new ilObjFile($a_file_id, false);
                $source_file = $file_obj->getDirectory($file_obj->getVersion())."/".$file_obj->getFileName();
                if (!is_file($source_file))
                {
                        $source_file = $file_obj->getDirectory()."/".$file_obj->getFileName();
                }
                copy($source_file, $file_dir."/".$file_obj->getFileName());
        }

        function exportHTMLMOB($a_target_dir, &$a_lm_gui, $a_mob_id, $a_frame = "")
        {
                global $tpl;

                $mob_dir = $a_target_dir."/mobs";

                $source_dir = ilUtil::getWebspaceDir()."/mobs/mm_".$a_mob_id;
                if (@is_dir($source_dir))
                {
                        ilUtil::makeDir($mob_dir."/mm_".$a_mob_id);
                        ilUtil::rCopy($source_dir, $mob_dir."/mm_".$a_mob_id);
                }
                
                $tpl = new ilTemplate("tpl.main.html", true, true);
                $tpl->addBlockFile("CONTENT", "content", "tpl.adm_content.html");
                $_GET["obj_type"]  = "MediaObject";
                $_GET["mob_id"]  = $a_mob_id;
                $_GET["frame"] = $a_frame;
                $_GET["cmd"] = "";
                $content =& $a_lm_gui->media();
                $file = $a_target_dir."/media_".$a_mob_id.".html";

                // open file
                if (!($fp = @fopen($file,"w+")))
                {
                        die ("<b>Error</b>: Could not open \"".$file."\" for writing".
                                " in <b>".__FILE__."</b> on line <b>".__LINE__."</b><br />");
                }
                chmod($file, 0770);
                fwrite($fp, $content);
                fclose($fp);
                
                // fullscreen
                include_once("content/classes/Media/class.ilObjMediaObject.php");
                $mob_obj = new ilObjMediaObject($a_mob_id);
                if ($mob_obj->hasFullscreenItem())
                {
                        $tpl = new ilTemplate("tpl.main.html", true, true);
                        $tpl->addBlockFile("CONTENT", "content", "tpl.adm_content.html");
                        $_GET["obj_type"]  = "";
                        $_GET["frame"]  = "";
                        $_GET["mob_id"]  = $a_mob_id;
                        $_GET["cmd"] = "fullscreen";
                        $content =& $a_lm_gui->fullscreen();
                        $file = $a_target_dir."/fullscreen_".$a_mob_id.".html";
        
                        // open file
                        if (!($fp = @fopen($file,"w+")))
                        {
                                die ("<b>Error</b>: Could not open \"".$file."\" for writing".
                                        " in <b>".__FILE__."</b> on line <b>".__LINE__."</b><br />");
                        }
                        chmod($file, 0770);
                        fwrite($fp, $content);
                        fclose($fp);
                }
        }
        
        function exportHTMLGlossaryTerms(&$a_lm_gui, $a_target_dir)
        {
                foreach($this->offline_int_links as $int_link)
                {
                        if ($int_link["type"] == "git")
                        {
                                $tpl = new ilTemplate("tpl.main.html", true, true);
                                $tpl->addBlockFile("CONTENT", "content", "tpl.adm_content.html");

                                $_GET["obj_id"] = $int_link["id"];
                                $_GET["frame"] = "_new";
                                $content =& $a_lm_gui->glossary();
                                $file = $a_target_dir."/term_".$int_link["id"].".html";
                                        
                                // open file
                                if (!($fp = @fopen($file,"w+")))
                                {
                                        die ("<b>Error</b>: Could not open \"".$file."\" for writing".
                                                        " in <b>".__FILE__."</b> on line <b>".__LINE__."</b><br />");
                                }
                                chmod($file, 0770);
                                fwrite($fp, $content);
                                fclose($fp);

                                // store linked/embedded media objects of glosssary term
                                include_once("content/classes/class.ilGlossaryDefinition.php");
                                $defs = ilGlossaryDefinition::getDefinitionList($int_link["id"]);
                                foreach($defs as $def)
                                {
                                        $def_mobs = ilObjMediaObject::_getMobsOfObject("gdf:pg", $def["id"]);
                                        foreach($def_mobs as $def_mob)
                                        {
                                                $this->offline_mobs[$def_mob] = $def_mob;
                                        }
                                        
                                        // get all files of page
                                        $def_files = ilObjFile::_getFilesOfObject("gdf:pg", $page["obj_id"]);
                                        $this->offline_files = array_merge($this->offline_files, $def_files);

                                }
                                
                        }
                }
        }
        
        function exportHTMLPages(&$a_lm_gui, $a_target_dir)
        {
                global $tpl;
                                
                $pages = ilLMPageObject::getPageList($this->getId());
                
                $lm_tree =& $this->getLMTree();
                $first_page = $lm_tree->fetchSuccessorNode($lm_tree->getRootId(), "pg");
                $this->first_page_id = $first_page["child"];

                // iterate all learning module pages
                $mobs = array();
                $int_links = array();
                $this->offline_files = array();
                foreach ($pages as $page)
                {
                        $this->exportPageHTML($a_lm_gui, $a_target_dir, $page["obj_id"]);
                        
                        // get all media objects of page
                        include_once("content/classes/Media/class.ilObjMediaObject.php");
                        $pg_mobs = ilObjMediaObject::_getMobsOfObject($this->getType().":pg", $page["obj_id"]);
                        foreach($pg_mobs as $pg_mob)
                        {
                                $mobs[$pg_mob] = $pg_mob;
                        }
                        
                        // get all internal links of page
                        $pg_links = ilInternalLink::_getTargetsOfSource($this->getType().":pg", $page["obj_id"]);
                        $int_links = array_merge($int_links, $pg_links);
                        
                        // get all files of page
                        include_once("classes/class.ilObjFile.php");
                        $pg_files = ilObjFile::_getFilesOfObject($this->getType().":pg", $page["obj_id"]);
                        $this->offline_files = array_merge($this->offline_files, $pg_files);
                        
                }
                $this->offline_mobs = $mobs;
                $this->offline_int_links = $int_links;
                
        }

        function exportPageHTML(&$a_lm_gui, $a_target_dir, $a_lm_page_id, $a_frame = "")
        {
                global $ilias, $tpl;
//echo "<br>B: export Page HTML ($a_lm_page_id)"; flush();
                // template workaround: reset of template 
                $tpl = new ilTemplate("tpl.main.html", true, true);
                $tpl->addBlockFile("CONTENT", "content", "tpl.adm_content.html");

                $_GET["obj_id"] = $a_lm_page_id;
                $_GET["frame"] = $a_frame;
                $content =& $a_lm_gui->layout("main.xml", false);
                
                if ($a_frame == "")
                {
                        $file = $a_target_dir."/lm_pg_".$a_lm_page_id.".html";
                }
                else
                {
                        if ($a_frame != "toc")
                        {
                                $file = $a_target_dir."/frame_".$a_lm_page_id."_".$a_frame.".html";
                        }
                        else
                        {
                                $file = $a_target_dir."/frame_".$a_frame.".html";
                        }
                }
                
                // return if file is already existing
                if (@is_file($file))
                {
                        return;
                }
                
                // open file
                if (!($fp = @fopen($file,"w+")))
                {
                        die ("<b>Error</b>: Could not open \"".$file."\" for writing".
                                        " in <b>".__FILE__."</b> on line <b>".__LINE__."</b><br />");
                }
        
                // set file permissions
                chmod($file, 0770);
                        
                // write xml data into the file
                fwrite($fp, $content);
                
                // close file
                fclose($fp);

                if ($this->first_page_id == $a_lm_page_id && $a_frame == "")
                {
                        copy($file, $a_target_dir."/index.html");
                }

                // write frames of frameset
                $frameset = $a_lm_gui->getCurrentFrameSet();
                foreach ($frameset as $frame)
                {                               
                        $this->exportPageHTML($a_lm_gui, $a_target_dir, $a_lm_page_id, $frame);
                }

        }

        function exportFO(&$a_xml_writer, $a_target_dir)
        {
                global $ilBench;

                // fo:root (start)
                $attrs = array();
                $attrs["xmlns:fo"] = "http://www.w3.org/1999/XSL/Format";
                $a_xml_writer->xmlStartTag("fo:root", $attrs);

                // fo:layout-master-set (start)
                $attrs = array();
                $a_xml_writer->xmlStartTag("fo:layout-master-set", $attrs);

                // fo:simple-page-master (start)
                $attrs = array();
                $attrs["master-name"] = "DinA4";
                $attrs["page-height"] = "29.7cm";
                $attrs["page-width"] = "21cm";
                $attrs["margin-top"] = "4cm";
                $attrs["margin-bottom"] = "1cm";
                $attrs["margin-left"] = "2.8cm";
                $attrs["margin-right"] = "7.3cm";
                $a_xml_writer->xmlStartTag("fo:simple-page-master", $attrs);

                // fo:region-body (complete)
                $attrs = array();
                $attrs["margin-top"] = "0cm";
                $attrs["margin-bottom"] = "1.25cm";
                $a_xml_writer->xmlElement("fo:region-body", $attrs);

                // fo:region-before (complete)
                $attrs = array();
                $attrs["extent"] = "1cm";
                $a_xml_writer->xmlElement("fo:region-before", $attrs);

                // fo:region-after (complete)
                $attrs = array();
                $attrs["extent"] = "1cm";
                $a_xml_writer->xmlElement("fo:region-after", $attrs);

                // fo:simple-page-master (end)
                $a_xml_writer->xmlEndTag("fo:simple-page-master");

                // fo:layout-master-set (end)
                $a_xml_writer->xmlEndTag("fo:layout-master-set");

                // fo:page-sequence (start)
                $attrs = array();
                $attrs["master-reference"] = "DinA4";
                $a_xml_writer->xmlStartTag("fo:page-sequence", $attrs);

                // fo:flow (start)
                $attrs = array();
                $attrs["flow-name"] = "xsl-region-body";
                $a_xml_writer->xmlStartTag("fo:flow", $attrs);


                // StructureObjects
                //$expLog->write(date("[y-m-d H:i:s] ")."Start Export Structure Objects");
                $ilBench->start("ContentObjectExport", "exportFOStructureObjects");
                $this->exportFOStructureObjects($a_xml_writer, $expLog);
                $ilBench->stop("ContentObjectExport", "exportFOStructureObjects");
                //$expLog->write(date("[y-m-d H:i:s] ")."Finished Export Structure Objects");*/

                // fo:flow (end)
                $a_xml_writer->xmlEndTag("fo:flow");

                // fo:page-sequence (end)
                $a_xml_writer->xmlEndTag("fo:page-sequence");

                // fo:root (end)
                $a_xml_writer->xmlEndTag("fo:root");
        }

        function exportFOStructureObjects(&$a_xml_writer)
        {
                $childs = $this->lm_tree->getChilds($this->lm_tree->getRootId());
                foreach ($childs as $child)
                {
                        if($child["type"] != "st")
                        {
                                continue;
                        }

                        $structure_obj = new ilStructureObject($this, $child["obj_id"]);
                        $structure_obj->exportFO($a_xml_writer, $expLog);
                        unset($structure_obj);
                }
        }

        function getXMLZip()
        {
                include_once("./content/classes/class.ilContObjectExport.php");

                $cont_exp = new ilContObjectExport($this,'xml');

                $export_file = $cont_exp->buildExportFile();
                return $export_file;
        }               


}
?>