class.ilMediaItem.php

Go to the documentation of this file.

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

require_once("Services/MediaObjects/classes/class.ilMapArea.php");

class ilMediaItem
{
        var $id;
        var $purpose;
        var $location;
        var $location_type;
        var $format;
        var $width;
        var $height;
        var $caption;
        var $halign;
        var $parameters;
        var $mob_id;
        var $nr;
        var $mapareas;
        var $map_cnt;
        var $map_image;                 // image map work copy image
        var $color1;                    // map area line color 1
        var $color2;                    // map area line color 2

        function __construct($a_id = 0)
        {
                $this->parameters = array();
                $this->mapareas = array();
                $this->map_cnt = 0;

                if ($a_id != 0)
                {
                        $this->setId($a_id);
                        $this->read();
                }
        }

        function setId($a_id)
        {
                $this->id = $a_id;
        }

        function getId()
        {
                return $this->id;
        }

        function setMobId($a_mob_id)
        {
                $this->mob_id = $a_mob_id;
        }

        function getMobId()
        {
                return $this->mob_id;
        }

        function setNr($a_nr)
        {
                $this->nr = $a_nr;
        }

        function getNr()
        {
                return $this->nr;
        }

        function setTextRepresentation($a_val)
        {
                $this->text_representation = $a_val;
        }
        
        function getTextRepresentation()
        {
                return $this->text_representation;
        }
        

        function create()
        {
                global $ilDB;

                $item_id = $ilDB->nextId("media_item");
                $query = "INSERT INTO media_item (id,mob_id, purpose, location, ".
                        "location_type, format, width, ".
                        "height, halign, caption, nr, text_representation) VALUES ".
                        "(".
                        $ilDB->quote($item_id, "integer").",".
                        $ilDB->quote($this->getMobId(), "integer").",".
                        $ilDB->quote($this->getPurpose(), "text").",".
                        $ilDB->quote($this->getLocation(), "text").",".
                        $ilDB->quote($this->getLocationType(), "text").",".
                        $ilDB->quote($this->getFormat(), "text").",".
                        $ilDB->quote($this->getWidth(), "text").",".
                        $ilDB->quote($this->getHeight(), "text").",".
                        $ilDB->quote($this->getHAlign(), "text").",".
                        $ilDB->quote($this->getCaption(), "text").",".
                        $ilDB->quote($this->getNr(), "integer").",".
                        $ilDB->quote($this->getTextRepresentation(), "text").")";
                $ilDB->manipulate($query);
                
                $this->setId($item_id);

                // create mob parameters
                $params = $this->getParameters();
                foreach($params as $name => $value)
                {
                        $query = "INSERT INTO mob_parameter (med_item_id, name, value) VALUES ".
                                "(".$ilDB->quote($item_id, "integer").",".
                                $ilDB->quote($name, "text").",".
                                $ilDB->quote($value, "text").")";
                        $ilDB->manipulate($query);
                }

                // create map areas
                for ($i=0; $i < count($this->mapareas); $i++)
                {
                        if (is_object($this->mapareas[$i]))
                        {
                                $this->mapareas[$i]->setItemId($this->getId());
                                $this->mapareas[$i]->setNr($i + 1);
                                $this->mapareas[$i]->create();
                        }
                }
        }

        function update()
        {
                global $ilDB;

                $query = "UPDATE media_item SET ".
                        " mob_id = ".$ilDB->quote($this->getMobId(), "integer").",".
                        " purpose = ".$ilDB->quote($this->getPurpose(), "text").",".
                        " location = ".$ilDB->quote($this->getLocation(), "text").",".
                        " location_type = ".$ilDB->quote($this->getLocationType(), "text").",".
                        " format = ".$ilDB->quote($this->getFormat(), "text").",".
                        " width = ".$ilDB->quote($this->getWidth(), "text").",".
                        " height = ".$ilDB->quote($this->getHeight(), "text").",".
                        " halign = ".$ilDB->quote($this->getHAlign(), "text").",".
                        " caption = ".$ilDB->quote($this->getCaption(), "text").",".
                        " nr = ".$ilDB->quote($this->getNr(), "integer").",".
                        " text_representation = ".$ilDB->quote($this->getTextRepresentation(), "text").
                        " WHERE id = ".$ilDB->quote($this->getId(), "integer");
                $ilDB->manipulate($query);

                // delete mob parameters
                $query = "DELETE FROM mob_parameter WHERE med_item_id = ".
                        $ilDB->quote($this->getId(), "integer");

                // create mob parameters
                $params = $this->getParameters();
                foreach($params as $name => $value)
                {
                        $query = "INSERT INTO mob_parameter (med_item_id, name, value) VALUES ".
                                "(".$ilDB->quote($this->getId(), "integer").",".
                                $ilDB->quote($name, "text").",".
                                $ilDB->quote($value, "text").")";
                        $ilDB->manipulate($query);
                }
        }

        function writeParameter($a_name, $a_value)
        {
                global $ilDB;

                $query = "INSERT INTO mob_parameter (med_item_id, name, value) VALUES ".
                        "(".$ilDB->quote($this->getId(), "integer").",".
                        $ilDB->quote($a_name, "text").",".
                        $ilDB->quote($a_value, "text").")";
                $ilDB->manipulate($query);
        }

        function read()
        {
                global $ilDB;

                $item_id = $this->getId();
                $mob_id = $this->getMobId();
                $nr = $this->getNr();
                $query = "";
                if($item_id > 0)
                {
                        $query = "SELECT * FROM media_item WHERE id = ".
                                $ilDB->quote($this->getId(), "integer");
                }
                else if ($mob_id > 0 && $nr > 0)
                {
                        $query = "SELECT * FROM media_item WHERE mob_id = ".
                                $ilDB->quote($this->getMobId(), "integer")." ".
                                "AND nr=".$ilDB->quote($this->getNr(), "integer");
                }
                if ($query != "")
                {
                        $item_set = $ilDB->query($query);
                        $item_rec = $ilDB->fetchAssoc($item_set);

                        $this->setLocation($item_rec["location"]);
                        $this->setLocationType($item_rec["location_type"]);
                        $this->setFormat($item_rec["format"]);
                        $this->setWidth($item_rec["width"]);
                        $this->setHeight($item_rec["height"]);
                        $this->setHAlign($item_rec["halign"]);
                        $this->setCaption($item_rec["caption"]);
                        $this->setPurpose($item_rec["purpose"]);
                        $this->setNr($item_rec["nr"]);
                        $this->setMobId($item_rec["mob_id"]);
                        $this->setId($item_rec["id"]);
                        $this->setThumbTried($item_rec["tried_thumb"]);
                        $this->setTextRepresentation($item_rec["text_representation"]);

                        // get item parameter
                        $query = "SELECT * FROM mob_parameter WHERE med_item_id = ".
                                $ilDB->quote($this->getId(), "integer");
                        $par_set = $ilDB->query($query);
                        while ($par_rec = $ilDB->fetchAssoc($par_set))
                        {
                                $this->setParameter($par_rec["name"], $par_rec["value"]);
                        }

                        // get item map areas
                        $max = ilMapArea::_getMaxNr($this->getId());
                        for ($i = 1; $i <= $max; $i++)
                        {
                                $area = new ilMapArea($this->getId(), $i);
                                $this->addMapArea($area);
                        }
                }

        }
        
        function writeThumbTried($a_tried)
        {
                global $ilDB;
                
                $q = "UPDATE media_item SET tried_thumb = ".
                        $ilDB->quote($a_tried, "text").
                        " WHERE id = ".$ilDB->quote($this->getId(), "integer");
                        
                $ilDB->manipulate($q);
        }

        static function _lookupLocationForMobId($a_mob_id, $a_purpose)
        {
                global $ilDB;
                
                // read media_object record
                $query = "SELECT * FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mob_id, "integer")." ".
                        "AND purpose = ".$ilDB->quote($a_purpose, "text");
                $set = $ilDB->query($query);
                if ($rec = $ilDB->fetchAssoc($set))
                {
                        return $rec["location"];
                }

                return "";
        }

        static function _lookupMobId($a_med_id)
        {
                global $ilDB;
                
                // read media_object record
                $query = "SELECT * FROM media_item WHERE id = ".
                        $ilDB->quote($a_med_id, "integer");
                $set = $ilDB->query($query);
                if ($rec = $ilDB->fetchAssoc($set))
                {
                        return $rec["mob_id"];
                }

                return "";
        }

        /* read media item with specific purpose and mobId
        *
        * @param        integer         $a_mobId                media object id
        * @param        string          $a_purpose              media object purpose
        * @return       array           $mob                    media object
        */
        static function _getMediaItemsOfMObId($a_mobId, $a_purpose)
        {
                global $ilDB;
                
                // read media_object record
                $query = "SELECT * FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mobId, "integer")." ".
                        "AND purpose=" . $ilDB->quote($a_purpose, "text")." ORDER BY nr";
                $item_set = $ilDB->query($query);
                
                while ($item_rec = $ilDB->fetchAssoc($item_set))
                {
                        return $item_rec;
                }
                return false;
        }
        
        static function _getMediaItemsOfMOb(&$a_mob)
        {
                global $ilDB;
                
                // read media_object record
                $query = "SELECT * FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mob->getId(), "integer")." ".
                        "ORDER BY nr";
                $item_set = $ilDB->query($query);
                while ($item_rec = $ilDB->fetchAssoc($item_set))
                {
                        $media_item = new ilMediaItem();
                        $media_item->setNr($item_rec["nr"]);
                        $media_item->setId($item_rec["id"]);
                        $media_item->setLocation($item_rec["location"]);
                        $media_item->setLocationType($item_rec["location_type"]);
                        $media_item->setFormat($item_rec["format"]);
                        $media_item->setWidth($item_rec["width"]);
                        $media_item->setHeight($item_rec["height"]);
                        $media_item->setHAlign($item_rec["halign"]);
                        $media_item->setCaption($item_rec["caption"]);
                        $media_item->setPurpose($item_rec["purpose"]);
                        $media_item->setMobId($item_rec["mob_id"]);
                        $media_item->setThumbTried($item_rec["tried_thumb"]);
                        $media_item->setTextRepresentation($item_rec["text_representation"]);

                        // get item parameter
                        $query = "SELECT * FROM mob_parameter WHERE med_item_id = ".
                                $ilDB->quote($item_rec["id"], "integer");
                        $par_set = $ilDB->query($query);
                        while ($par_rec = $ilDB->fetchAssoc($par_set))
                        {
                                $media_item->setParameter($par_rec["name"], $par_rec["value"]);
                        }

                        // get item map areas
                        $max = ilMapArea::_getMaxNr($media_item->getId());
                        for ($i = 1; $i <= $max; $i++)
                        {
                                $area = new ilMapArea($media_item->getId(), $i);
                                $media_item->addMapArea($area);
                        }

                        // add media item to media object
                        $a_mob->addMediaItem($media_item);
                }
        }

        static function deleteAllItemsOfMob($a_mob_id)
        {
                global $ilDB;
                
                // iterate all media items ob mob
                $query = "SELECT * FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mob_id, "integer");
                $item_set = $ilDB->query($query);
                while ($item_rec = $ilDB->fetchAssoc($item_set))
                {
                        // delete all parameters of media item
                        $query = "DELETE FROM mob_parameter WHERE med_item_id = ".
                                $ilDB->quote($item_rec["id"], "integer");
                        $ilDB->manipulate($query);

                        // delete all map areas of media item
                        $query = "DELETE FROM map_area WHERE item_id = ".
                                $ilDB->quote($item_rec["id"], "integer");
                        $ilDB->manipulate($query);
                }

                // delete media items
                $query = "DELETE FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mob_id, "integer");
                $ilDB->manipulate($query);
        }

        function setPurpose($a_purpose)
        {
                $this->purpose = $a_purpose;
        }

        function getPurpose()
        {
                return $this->purpose;
        }

        function setLocation($a_location)
        {
                $this->location = $a_location;
        }

        function getLocation()
        {
                return $this->location;
        }

        function setLocationType($a_type)
        {
                $this->location_type = $a_type;
        }

        function getLocationType()
        {
                return $this->location_type;
        }

        function setFormat($a_format)
        {
                $this->format = $a_format;
        }

        function getFormat()
        {
                return $this->format;
        }

        function setThumbTried($a_tried)
        {
                $this->tried_thumb = $a_tried;
        }

        function getThumbTried()
        {
                return $this->tried_thumb;
        }

        function addMapArea(&$a_map_area)
        {
                $this->mapareas[$this->map_cnt] = $a_map_area;
                $this->map_cnt++;
        }

        function deleteMapArea($nr)
        {
                for ($i=1; $i<=$this->map_cnt; $i++)
                {
                        if($i > $nr)
                        {
                                $this->mapareas[$i-2] = $this->mapareas[$i-1];
                                $this->mapareas[$i-2]->setNr($i-1);
                        }
                }
                if($nr <= $this->map_cnt)
                {
                        unset($this->mapareas[$this->map_cnt - 1]);
                        $this->map_cnt--;
                }
        }

        function &getMapArea($nr)
        {
                return $this->mapareas[$nr-1];
        }

        function getMapAreas()
        {
                return $this->mapareas;
        }

        function getWidth()
        {
                return $this->width;
        }

        function setWidth($a_width)
        {
                $this->width = $a_width;
        }

        function getHeight()
        {
                return $this->height;
        }

        function setHeight($a_height)
        {
                $this->height = $a_height;
        }

        function getOriginalSize()
        {
                $mob_dir = ilObjMediaObject::_getDirectory($this->getMobId());

                if (ilUtil::deducibleSize($this->getFormat()))
                {
                        if ($this->getLocationType() == "LocalFile")
                        {
                                $loc = $mob_dir."/".$this->getLocation();
                        }
                        else
                        {
                                $loc = $this->getLocation();
                        }

                        include_once("./Services/MediaObjects/classes/class.ilMediaImageUtil.php");
                        $size = ilMediaImageUtil::getImageSize($loc);
                        if ($size[0] > 0 && $size[1] > 0)
                        {
                                return array("width" => $size[0], "height" => $size[1]);
                        }
                }

                return false;
        }

        function setCaption($a_caption)
        {
                $this->caption = $a_caption;
        }

        function getCaption()
        {
                return $this->caption;
        }

        function setHAlign($a_halign)
        {
                $this->halign = $a_halign;
        }

        function getHAlign()
        {
                return $this->halign;
        }


        function setParameter($a_name, $a_value)
        {
                if (self::checkParameter($a_name, $a_value))
                {
                        $this->parameters[$a_name] = $a_value;
                }
        }

        function resetParameters()
        {
                $this->parameters = array();
        }

        function setParameters($a_par)
        {
                $this->resetParameters();
                $par_arr = ilUtil::extractParameterString($a_par);
                if(is_array($par_arr))
                {
                        foreach($par_arr as $par => $val)
                        {
                                $this->setParameter($par, $val);
                        }
                }
        }

        static function checkParameter($a_par, $a_val)
        {
                // do not allow event attributes
                if (substr(strtolower(trim($a_par)), 0, 2) == "on")
                {
                        return false;
                }
                // no javascript in value
                if (is_int(strpos(strtolower($a_val), "javascript")))
                {
                        return false;
                }
                // do not allow to change the src attribute
                if (in_array(strtolower(trim($a_par)), array("src")))
                {
                        return false;
                }

                return true;
        }


        function getParameters()
        {
                return $this->parameters;
        }


        function getParameterString()
        {
                return ilUtil::assembleParameterString($this->parameters);
        }


        function getParameter($a_name)
        {
                return $this->parameters[$a_name];
        }

        function getWorkDirectory()
        {
                return ilUtil::getDataDir()."/map_workfiles/item_".$this->getId();
        }

        function createWorkDirectory()
        {
                if(!@is_dir(ilUtil::getDataDir()."/map_workfiles"))
                {
                        ilUtil::createDirectory(ilUtil::getDataDir()."/map_workfiles");
                }
                $work_dir = $this->getWorkDirectory();
                if(!@is_dir($work_dir))
                {
                        ilUtil::createDirectory($work_dir);
                }
        }

        function getSuffix()
        {
                $loc_arr = explode(".", $this->getLocation());

                return $loc_arr[count($loc_arr) - 1];
        }

        function getMapWorkCopyType()
        {
                return ilUtil::getGDSupportedImageType($this->getSuffix());
        }

        function getMapWorkCopyName($a_reference_copy = false)
        {
                $file_arr = explode("/", $this->getLocation());
                $o_file = $file_arr[count($file_arr) - 1];
                $file_arr = explode(".", $o_file);
                unset($file_arr[count($file_arr) - 1]);
                $file = implode($file_arr, ".");

                if (!$a_reference_copy)
                {
                        return $this->getWorkDirectory()."/".$file.".".$this->getMapWorkCopyType();
                }
                else
                {
                        return $this->getWorkDirectory()."/l_copy_".$o_file;
                }
        }

        function getDirectory()
        {
                return ilObjMediaObject::_getDirectory($this->getMobId());
        }

        function getThumbnailDirectory($a_mode = "filesystem")
        {
                return ilObjMediaObject::_getThumbnailDirectory($this->getMobId(), $a_mode);
        }

        function getThumbnailTarget($a_size = "")
        {
                if (is_int(strpos($this->getFormat(), "image")))
                {
                        $thumb_file = $this->getThumbnailDirectory()."/".
                                $this->getPurpose().".jpeg";

                        $thumb_file_small = $this->getThumbnailDirectory()."/".
                                $this->getPurpose()."_small.jpeg";

                        // generate thumbnail (if not tried before)
                        if ($this->getThumbTried() == "n" && $this->getLocationType() == "LocalFile")
                        {
                                if (is_file($thumb_file))
                                {
                                        unlink($thumb_file);
                                }
                                if (is_file($thumb_file_small))
                                {
                                        unlink($thumb_file_small);
                                }
                                $this->writeThumbTried("y");
                                ilObjMediaObject::_createThumbnailDirectory($this->getMobId());
                                $med_file = $this->getDirectory()."/".$this->getLocation();

                                if (is_file($med_file))
                                {
                                        ilUtil::convertImage($med_file, $thumb_file, "jpeg", "80");
                                        ilUtil::convertImage($med_file, $thumb_file_small, "jpeg", "40");
                                }
                        }

                        if ($a_size == "small")
                        {
                                if (is_file($thumb_file_small))
                                {
                                        return $this->getThumbnailDirectory("output")."/".
                                                $this->getPurpose()."_small.jpeg?dummy=".rand(1, 999999);
                                }
                        }
                        else
                        {
                                if (is_file($thumb_file))
                                {
                                        return $this->getThumbnailDirectory("output")."/".
                                                $this->getPurpose().".jpeg?dummy=".rand(1, 999999);
                                }
                        }
                }

                return "";
        }


        function copyOriginal()
        {
                global $lng;
            $this->createWorkDirectory();

                $geom = ($this->getWidth() != "" && $this->getHeight() != "")
                        ? $this->getWidth()."x".$this->getHeight()
                        : "";

                if ($this->getLocationType() != "Reference")
                {
                        ilUtil::convertImage($this->getDirectory()."/".$this->getLocation(),
                                $this->getMapWorkCopyName(),
                                $this->getMapWorkCopyType(), $geom);
                }
                else
                {
                        // first copy the external file, if necessary
                        if (!is_file($this->getMapWorkCopyName(true)) || (filesize($this->getMapWorkCopyName(true)) == 0))
                        {
                                $handle = @fopen($this->getLocation(), "r");
                                $lcopy = fopen($this->getMapWorkCopyName(true), "w");
                                if ($handle && $lcopy)
                                {
                                        while (!feof($handle))
                                        {
                                                $content = fread($handle, 4096);
                                                fwrite($lcopy, $content);
                                        }
                                }
                                @fclose($lcopy);
                                @fclose($handle);
                        }
                        
                        // now, create working copy
                        ilUtil::convertImage($this->getMapWorkCopyName(true),
                                $this->getMapWorkCopyName(),
                                $this->getMapWorkCopyType(), $geom);
                }

                if (!is_file($this->getMapWorkCopyName()))
                {
                    
                        ilUtil::sendFailure($lng->txt("cont_map_file_not_generated"));
                        return false;
                }
                return true;
        }
        
        function makeMapWorkCopy($a_area_nr = 0, $a_exclude = false)
        {
                global $lng;
                
                if (!$this->copyOriginal())
                {
                        return false;
                }
                $this->buildMapWorkImage();
                
                // determine ratios
                $size = @getimagesize($this->getMapWorkCopyName());
                $x_ratio = 1;
                if ($size[0] > 0 && $this->getWidth() > 0)
                {
                        $x_ratio = $this->getWidth() / $size[0];
                }
                $y_ratio = 1;
                if ($size[1] > 0 && $this->getHeight() > 0)
                {
                        $y_ratio = $this->getHeight() / $size[1];
                }

                // draw map areas
                for ($i=0; $i < count($this->mapareas); $i++)
                {
                        if (    ((($i+1) == $a_area_nr) && !$a_exclude) ||
                                        ((($i+1) != $a_area_nr) && $a_exclude) ||
                                        ($a_area_nr == 0)
                                )
                        {
                                $area = $this->mapareas[$i];
                                $area->draw($this->getMapWorkImage(), $this->color1, $this->color2, true,
                                        $x_ratio, $y_ratio);
                        }
                }

                $this->saveMapWorkImage();
                
                return true;
        }


        function addAreaToMapWorkCopy($a_shape, $a_coords)
        {
                $this->buildMapWorkImage();

                // determine ratios
                $size = @getimagesize($this->getMapWorkCopyName());
                $x_ratio = 1;
                if ($size[0] > 0 && $this->getWidth() > 0)
                {
                        $x_ratio = $this->getWidth() / $size[0];
                }
                $y_ratio = 1;
                if ($size[1] > 0 && $this->getHeight() > 0)
                {
                        $y_ratio = $this->getHeight() / $size[1];
                }

                // add new area to work image
                $area = new ilMapArea();
                $area->setShape($a_shape);
                $area->setCoords($a_coords);
                $area->draw($this->getMapWorkImage(), $this->color1, $this->color2, false,
                        $x_ratio, $y_ratio);

                $this->saveMapWorkImage();
        }

        function outputMapWorkCopy()
        {
                if ($this->getMapWorkCopyType() != "")
                {
                        header("Pragma: no-cache");
                        header("Expires: 0");
                        header("Content-type: image/".strtolower($this->getMapWorkCopyType()));
                        readfile($this->getMapWorkCopyName());
                }
                exit;
        }

        function buildMapWorkImage()
        {
                $im_type = strtolower($this->getMapWorkCopyType());

                switch ($im_type)
                {
                        case "gif":
                                $this->map_image = ImageCreateFromGIF($this->getMapWorkCopyName());
                                break;

                        case "jpg":
                        case "jpeg":
                                $this->map_image = ImageCreateFromJPEG($this->getMapWorkCopyName());
                                break;

                        case "png":
                                $this->map_image = ImageCreateFromPNG($this->getMapWorkCopyName());
                                break;
                }

                // try to allocate black and white as color. if this is not possible, get the closest colors
                if (imagecolorstotal($this->map_image) > 250)
                {
                        $this->color1 = imagecolorclosest($this->map_image, 0, 0, 0);
                        $this->color2 = imagecolorclosest($this->map_image, 255, 255, 255);
                }
                else
                {
                        $this->color1 = imagecolorallocate($this->map_image, 0, 0, 0);
                        $this->color2 = imagecolorallocate($this->map_image, 255, 255, 255);
                }
        }

        function saveMapWorkImage()
        {
                $im_type = strtolower($this->getMapWorkCopyType());

                // save image work-copy and free memory
                switch ($im_type)
                {
                        case "gif":
                                ImageGIF($this->map_image, $this->getMapWorkCopyName());
                                break;

                        case "jpg":
                        case "jpeg":
                                ImageJPEG($this->map_image, $this->getMapWorkCopyName());
                                break;

                        case "png":
                                ImagePNG($this->map_image, $this->getMapWorkCopyName());
                                break;
                }

                ImageDestroy($this->map_image);
        }

        function &getMapWorkImage()
        {
                return $this->map_image;
        }


        function getMapAreasXML($a_insert_inst = false, $a_inst = 0)
        {
                $xml = "";

                // build xml of map areas
                for ($i=0; $i < count($this->mapareas); $i++)
                {
                        $area = $this->mapareas[$i];
                        
                        // highlight mode
                        $hm = "";
                        if ($area->getHighlightMode() != "")
                        {
                                $hm = ' HighlightMode="'.$area->getHighlightMode().'" ';
                                $hcl = ($area->getHighlightClass() != "")
                                        ? $area->getHighlightClass()
                                        : "Accented";
                                $hm.= 'HighlightClass="'.$hcl.'" ';
                        }
                        
                        $xml .= "<MapArea Shape=\"".$area->getShape()."\" Coords=\"".$area->getCoords()."\" ".$hm.">";
                        if ($area->getLinkType() == IL_INT_LINK)
                        {
                                $target_frame = $area->getTargetFrame();

                                if ($area->getType() == "GlossaryItem" && $target_frame == "")
                                {
                                        $target_frame = "Glossary";
                                }

                                $tf_str = ($target_frame == "")
                                        ? ""
                                        : "TargetFrame=\"".$target_frame."\"";
                                
                                $xml .= "<IntLink Target=\"".$area->getTarget($a_insert_inst, $a_inst)."\" Type=\"".
                                        $area->getType()."\" $tf_str>";
                                // see bug 17893 and http://stackoverflow.com/questions/4026502/xml-error-at-ampersand
                                $xml .= htmlspecialchars($area->getTitle(), ENT_QUOTES);
                                $xml .="</IntLink>";
                        }
                        else
                        {
                                $xml .= "<ExtLink Href=\"".str_replace("&", "&amp;",$area->getHref())."\" Title=\"".
                                        str_replace("&", "&amp;",$area->getExtTitle())."\">";
                                $xml .= str_replace("&", "&amp;", $area->getTitle());
                                $xml .="</ExtLink>";
                        }
                        $xml .= "</MapArea>";
                }
                return $xml;
        }


        static function _resolveMapAreaLinks($a_mob_id)
        {
                global $ilDB;
                
//echo "mediaItems::resolve<br>";
                // read media_object record
                $query = "SELECT * FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mob_id, "integer")." ".
                        "ORDER BY nr";
                $item_set = $ilDB->query($query);
                while ($item_rec = $ilDB->fetchAssoc($item_set))
                {
                        ilMapArea::_resolveIntLinks($item_rec["id"]);
                }
        }

        static function _getMapAreasIntLinks($a_mob_id)
        {
                global $ilDB;
                
                // read media_items records
                $query = "SELECT * FROM media_item WHERE mob_id = ".
                        $ilDB->quote($a_mob_id, "integer")." ORDER BY nr";

                $item_set = $ilDB->query($query);
                $links = array();
                while ($item_rec = $ilDB->fetchAssoc($item_set))
                {
                        $map_links = ilMapArea::_getIntLinks($item_rec["id"]);
                        foreach($map_links as $key => $map_link)
                        {
                                $links[$key] = $map_link;
                        }
                }
                return $links;
        }

        function extractUrlParameters()
        {
                include_once("./Services/MediaObjects/classes/class.ilExternalMediaAnalyzer.php");
                $par = ilExternalMediaAnalyzer::extractUrlParameters(
                        $this->getLocation(), $this->getParameters());
                foreach ($par as $k => $v)
                {
                        $this->setParameter($k, $v);
                }
        }
}
?>