class.ilNewsItem.php

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<?php
/* Copyright (c) 1998-2012 ILIAS open source, Extended GPL, see docs/LICENSE */
 
define("NEWS_NOTICE", 0);
define("NEWS_MESSAGE", 1);
define("NEWS_WARNING", 2);
 
define("NEWS_TEXT", "text");
define("NEWS_HTML", "html");
define("NEWS_AUDIO", "audio");
define("NEWS_USERS", "users");
define("NEWS_PUBLIC", "public");
 
 
 
class ilNewsItem
{
        protected $id;
        protected $title;
        protected $content;
        protected $content_html;
        protected $context_obj_id;
        protected $context_obj_type;
        protected $context_sub_obj_id;
        protected $context_sub_obj_type;
        protected $content_type = "text";
        protected $creation_date;
        protected $update_date;
        protected $user_id;
        protected $update_user_id;
        protected $visibility = "users";
        protected $content_long;
        protected $priority = 1;
        protected $content_is_lang_var = 0;
        protected $mob_id;
        protected $playtime;
 
        private static $privFeedId = false;
        private $limitation;
        
        public function __construct($a_id = 0)
        {
                if ($a_id > 0)
                {
                        $this->setId($a_id);
                        $this->read();
                }
                $this->limitation = true;
        }
 
        public function setId($a_id)
        {
                $this->id = $a_id;
        }
 
        public function getId()
        {
                return $this->id;
        }
 
        public function setTitle($a_title)
        {
                $this->title = $a_title;
        }
 
        public function getTitle()
        {
                return $this->title;
        }
 
        public function setContent($a_content)
        {
                $this->content = $a_content;
        }
 
        public function getContent()
        {
                return $this->content;
        }
 
        public function setContextObjId($a_context_obj_id)
        {
                $this->context_obj_id = $a_context_obj_id;
        }
 
        public function getContextObjId()
        {
                return $this->context_obj_id;
        }
 
        public function setContextObjType($a_context_obj_type)
        {
                $this->context_obj_type = $a_context_obj_type;
        }
 
        public function getContextObjType()
        {
                return $this->context_obj_type;
        }
 
        public function setContextSubObjId($a_context_sub_obj_id)
        {
                $this->context_sub_obj_id = $a_context_sub_obj_id;
        }
 
        public function getContextSubObjId()
        {
                return $this->context_sub_obj_id;
        }
 
        public function setContextSubObjType($a_context_sub_obj_type)
        {
                $this->context_sub_obj_type = $a_context_sub_obj_type;
        }
 
        public function getContextSubObjType()
        {
                return $this->context_sub_obj_type;
        }
 
        public function setContentType($a_content_type = "text")
        {
                $this->content_type = $a_content_type;
        }
 
        public function getContentType()
        {
                return $this->content_type;
        }
 
        public function setCreationDate($a_creation_date)
        {
                $this->creation_date = $a_creation_date;
        }
 
        public function getCreationDate()
        {
                return $this->creation_date;
        }
 
        public function setUpdateDate($a_update_date)
        {
                $this->update_date = $a_update_date;
        }
 
        public function getUpdateDate()
        {
                return $this->update_date;
        }
 
        public function setUserId($a_user_id)
        {
                $this->user_id = $a_user_id;
        }
 
        public function getUserId()
        {
                return $this->user_id;
        }
 
        function setUpdateUserId($a_val)
        {
                $this->update_user_id = $a_val;
        }
 
        function getUpdateUserId()
        {
                return $this->update_user_id;
        }
 
        public function setVisibility($a_visibility = "users")
        {
                $this->visibility = $a_visibility;
        }
 
        public function getVisibility()
        {
                return $this->visibility;
        }
 
        public function setContentLong($a_content_long)
        {
                $this->content_long = $a_content_long;
        }
 
        public function getContentLong()
        {
                return $this->content_long;
        }
 
        public function setPriority($a_priority = 1)
        {
                $this->priority = $a_priority;
        }
 
        public function getPriority()
        {
                return $this->priority;
        }
 
        public function setContentIsLangVar($a_content_is_lang_var = 0)
        {
                $this->content_is_lang_var = $a_content_is_lang_var;
        }
 
        public function getContentIsLangVar()
        {
                return $this->content_is_lang_var;
        }
 
        public function setMobId($a_mob_id)
        {
                $this->mob_id = $a_mob_id;
        }
 
        public function getMobId()
        {
                return $this->mob_id;
        }
 
        public function setPlaytime($a_playtime)
        {
                $this->playtime = $a_playtime;
        }
 
        public function getPlaytime()
        {
                return $this->playtime;
        }
 
 
        function setLimitation($a_limitation)
        {
                $this->limitation = $a_limitation;
        }
 
        function getLimitation()
        {
                return $this->limitation;
        }
 
        public function setContentTextIsLangVar($a_val = 0)
        {
                $this->content_text_is_lang_var = $a_val;
        }
 
        public function getContentTextIsLangVar()
        {
                return $this->content_text_is_lang_var;
        }
 
        function setMobPlayCounter($a_val)
        {
                $this->mob_cnt_play = $a_val;
        }
        
        function getMobPlayCounter()
        {
                return $this->mob_cnt_play;
        }
 
        function setMobDownloadCounter($a_val)
        {
                $this->mob_cnt_download = $a_val;
        }
        
        function getMobDownloadCounter()
        {
                return $this->mob_cnt_download;
        }
 
        function setContentHtml($a_val)
        {
                $this->content_html = $a_val;
        }
 
        function getContentHtml()
        {
                return $this->content_html;
        }
        
        public function read()
        {
                global $ilDB;
 
                $query = "SELECT * FROM il_news_item WHERE id = ".
                        $ilDB->quote($this->getId(), "integer");
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
 
                $this->setTitle($rec["title"]);
                $this->setContent($rec["content"]);
                $this->setContextObjId((int) $rec["context_obj_id"]);
                $this->setContextObjType($rec["context_obj_type"]);
                $this->setContextSubObjId((int) $rec["context_sub_obj_id"]);
                $this->setContextSubObjType($rec["context_sub_obj_type"]);
                $this->setContentType($rec["content_type"]);
                $this->setCreationDate($rec["creation_date"]);
                $this->setUpdateDate($rec["update_date"]);
                $this->setUserId($rec["user_id"]);
                $this->setUpdateUserId($rec["update_user_id"]);
                $this->setVisibility($rec["visibility"]);
                $this->setContentLong($rec["content_long"]);
                $this->setPriority($rec["priority"]);
                $this->setContentIsLangVar($rec["content_is_lang_var"]);
                $this->setContentTextIsLangVar((int) $rec["content_text_is_lang_var"]);
                $this->setMobId($rec["mob_id"]);
                $this->setPlaytime($rec["playtime"]);
                $this->setMobPlayCounter($rec["mob_cnt_play"]);
                $this->setMobDownloadCounter($rec["mob_cnt_download"]);
                $this->setContentHtml($rec["content_html"]);
 
        }
 
        function create()
        {
                global $ilDB;
 
                // insert new record into db
                $this->setId($ilDB->nextId("il_news_item"));
                $ilDB->insert("il_news_item", array(
                        "id" => array("integer", $this->getId()),
                        "title" => array("text", $this->getTitle()),
                        "content" => array("clob", $this->getContent()),
                        "content_html" => array("integer", (int) $this->getContentHtml()),
                        "context_obj_id" => array("integer", (int) $this->getContextObjId()),
                        "context_obj_type" => array("text", $this->getContextObjType()),
                        "context_sub_obj_id" => array("integer", (int) $this->getContextSubObjId()),
                        "context_sub_obj_type" => array("text", $this->getContextSubObjType()),
                        "content_type" => array("text", $this->getContentType()),
                        "creation_date" => array("timestamp", ilUtil::now()),
                        "update_date" => array("timestamp", ilUtil::now()),
                        "user_id" => array("integer", $this->getUserId()),
                        "update_user_id" => array("integer", (int) $this->getUpdateUserId()),
                        "visibility" => array("text", $this->getVisibility()),
                        "content_long" => array("clob", $this->getContentLong()),
                        "priority" => array("integer", $this->getPriority()),
                        "content_is_lang_var" => array("integer", $this->getContentIsLangVar()),
                        "content_text_is_lang_var" => array("integer", (int) $this->getContentTextIsLangVar()),
                        "mob_id" => array("integer", $this->getMobId()),
            "playtime" => array("text", $this->getPlaytime())
                ));
 
                
                $news_set = new ilSetting("news");
                $max_items = $news_set->get("max_items");
                if ($max_items <= 0)
                {
                        $max_items = 50;
                }
                
                // limit number of news
                if ($this->getLimitation())
                {
                        // Determine how many rows should be deleted
                        $query = "SELECT count(*) cnt ".
                                "FROM il_news_item ".
                                "WHERE ".
                                        "context_obj_id = ".$ilDB->quote($this->getContextObjId(), "integer").
                                        " AND context_obj_type = ".$ilDB->quote($this->getContextObjType(), "text").
                                        " AND context_sub_obj_id = ".$ilDB->quote($this->getContextSubObjId(), "integer").
                                        " AND ".$ilDB->equals("context_sub_obj_type", $this->getContextSubObjType(), "text", true)." ";
        
                        $set = $ilDB->query($query);
                        $rec = $ilDB->fetchAssoc($set);
                                        
                        // if we have more records than allowed, delete them
                        if (($rec["cnt"] > $max_items) && $this->getContextObjId() > 0)
                        {
                                $query = "SELECT * ".
                                        "FROM il_news_item ".
                                        "WHERE ".
                                                "context_obj_id = ".$ilDB->quote($this->getContextObjId(), "integer").
                                                " AND context_obj_type = ".$ilDB->quote($this->getContextObjType(), "text").
                                                " AND context_sub_obj_id = ".$ilDB->quote($this->getContextSubObjId(), "integer").
                                                " AND ".$ilDB->equals("context_sub_obj_type", $this->getContextSubObjType(), "text", true).
                        " ORDER BY creation_date ASC";
        
                                $ilDB->setLimit($rec["cnt"] - $max_items);
                                $del_set = $ilDB->query($query);
                                while ($del_item = $ilDB->fetchAssoc($del_set))
                                {
                                        $del_news = new ilNewsItem($del_item["id"]);
                                        $del_news->delete();
                                }
                        }
                }
        }
 
        public function update($a_as_new = false)
        {
                global $ilDB;
 
                $fields = array(
                        "title" => array("text", $this->getTitle()),
                        "content" => array("clob", $this->getContent()),
                        "content_html" => array("integer", (int) $this->getContentHtml()),
                        "context_obj_id" => array("integer", $this->getContextObjId()),
                        "context_obj_type" => array("text", $this->getContextObjType()),
                        "context_sub_obj_id" => array("integer", $this->getContextSubObjId()),
                        "context_sub_obj_type" => array("text", $this->getContextSubObjType()),
                        "content_type" => array("text", $this->getContentType()),
                        "user_id" => array("integer", $this->getUserId()),
                        "update_user_id" => array("integer", (int) $this->getUpdateUserId()),
                        "visibility" => array("text", $this->getVisibility()),
                        "content_long" => array("clob", $this->getContentLong()),
                        "priority" => array("integer", $this->getPriority()),
                        "content_is_lang_var" => array("integer", $this->getContentIsLangVar()),
                        "content_text_is_lang_var" => array("integer", (int) $this->getContentTextIsLangVar()),
                        "mob_id" => array("integer", $this->getMobId()),
                        "mob_cnt_play" => array("integer", $this->getMobPlayCounter()),
                        "mob_cnt_download" => array("integer", $this->getMobDownloadCounter()),
            "playtime" => array("text", $this->getPlaytime())
                );
 
                $now = ilUtil::now();
                if ($a_as_new)
                {
                        $fields["creation_date"] = array("timestamp", $now);
                        $fields["update_date"] = array("timestamp", $now);
                }
                else
                {
                        $fields["update_date"] = array("timestamp", $now);
                }
 
                $ilDB->update("il_news_item", $fields, array(
                        "id" => array("integer", $this->getId())
                ));
 
        }
 
 
        static function _getNewsItemsOfUser($a_user_id, $a_only_public = false,
                $a_prevent_aggregation = false, $a_per = 0, &$a_cnt = NULL)
        {
                global $ilAccess;
 
                $news_item = new ilNewsItem();
                $news_set = new ilSetting("news");
                
                $per = $a_per;
 
                include_once("./Services/News/classes/class.ilNewsSubscription.php");
                include_once("./Services/Block/classes/class.ilBlockSetting.php");
                
                // this is currently not used
                $ref_ids = ilNewsSubscription::_getSubscriptionsOfUser($a_user_id);
                
                if (ilObjUser::_lookupPref($a_user_id, "pd_items_news") != "n")
                {
                        // get all items of the personal desktop
                        $pd_items = ilObjUser::_lookupDesktopItems($a_user_id);
                        foreach($pd_items as $item)
                        {
                                if (!in_array($item["ref_id"], $ref_ids))
                                {
                                        $ref_ids[] = $item["ref_id"];
                                }
                        }
                        
                        // get all memberships
                        include_once 'Services/Membership/classes/class.ilParticipants.php';
                        $crs_mbs = ilParticipants::_getMembershipByType($a_user_id, 'crs');
                        $grp_mbs = ilParticipants::_getMembershipByType($a_user_id, 'grp');
                        $items = array_merge($crs_mbs, $grp_mbs);
                        foreach($items as $i)
                        {
                                $item_references = ilObject::_getAllReferences($i);
                                if(is_array($item_references) && count($item_references))
                                {
                                        foreach($item_references as $ref_id)
                                        {
                                                if (!in_array($ref_id, $ref_ids))
                                                {
                                                        $ref_ids[] = $ref_id;
                                                }
                                        }
                                }
                        }
                }
                
                $data = array();
 
                foreach($ref_ids as $ref_id)
                {
                        if (!$a_only_public)
                        {
                                // this loop should not cost too much performance
                                $acc = $ilAccess->checkAccessOfUser($a_user_id, "read", "", $ref_id);
                                
                                if (!$acc)
                                {
                                        continue;
                                }
                        }
                        if (ilNewsItem::getPrivateFeedId() != false) {
                                global $rbacsystem;
                                $acc = $rbacsystem->checkAccessOfUser(ilNewsItem::getPrivateFeedId(),"read", $ref_id);
                        
                                if (!$acc)
                                {
                                        continue;
                                }
                        }
 
                        $obj_id = ilObject::_lookupObjId($ref_id);
                        $obj_type = ilObject::_lookupType($obj_id);
                        $news = $news_item->getNewsForRefId($ref_id, $a_only_public, false,
                                $per, $a_prevent_aggregation, false, false, false, $a_user_id);
                        
                        // counter
                        if (!is_null($a_cnt))
                        {
                                $a_cnt[$ref_id] = count($news);
                        }
 
                        $data = ilNewsItem::mergeNews($data, $news);
                }
 
        $data = ilUtil::sortArray($data, "creation_date", "desc", false, true);
 
                return $data;
        }
        
        function getNewsForRefId($a_ref_id, $a_only_public = false, $a_stopnesting = false,
                $a_time_period = 0, $a_prevent_aggregation = true, $a_forum_group_sequences = false,
                $a_no_auto_generated = false, $a_ignore_date_filter = false, $a_user_id = null, $a_limit = 0, $a_excluded = array())
        {
                $obj_id = ilObject::_lookupObjId($a_ref_id);
                $obj_type = ilObject::_lookupType($obj_id);
                
                // get starting date
        $starting_date = "";
                if ($obj_type == "grp" || $obj_type == "crs" || $obj_type == "cat")
                {
                        include_once("./Services/Block/classes/class.ilBlockSetting.php");
                        $hide_news_per_date = ilBlockSetting::_lookup("news", "hide_news_per_date",
                                0, $obj_id);
                        if ($hide_news_per_date && !$a_ignore_date_filter)
                        {
                                $starting_date = ilBlockSetting::_lookup("news", "hide_news_date",
                                        0, $obj_id);
                        }
                }
 
                if ($obj_type == "cat" && !$a_stopnesting)
                {
                        $news = $this->getAggregatedChildNewsData($a_ref_id, $a_only_public, $a_time_period,
                $a_prevent_aggregation, $starting_date, $a_no_auto_generated);
                }
                else if (($obj_type == "grp" || $obj_type == "crs") &&
                        !$a_stopnesting)
                {
                        $news = $this->getAggregatedNewsData($a_ref_id, $a_only_public, $a_time_period,
                $a_prevent_aggregation, $starting_date, $a_no_auto_generated, $a_user_id, $a_limit, $a_excluded);
                }
                else
                {
                        $news_item = new ilNewsItem();
                        $news_item->setContextObjId($obj_id);
                        $news_item->setContextObjType($obj_type);
                        $news = $news_item->queryNewsForContext($a_only_public, $a_time_period,
                $starting_date, $a_no_auto_generated);
                        $unset = array();
                        foreach ($news as $k => $v)
                        {
                                if (!$a_only_public || $v["visibility"] == NEWS_PUBLIC ||
                    ($v["priority"] == 0 &&
                                                ilBlockSetting::_lookup("news", "public_notifications",
                                                0, $obj_id)))
                                {
                                        $news[$k]["ref_id"] = $a_ref_id;
                                }
                                else
                                {
                                        $unset[] = $k;
                                }
                        }
                        foreach ($unset as $un)
                        {
                                unset($news[$un]);
                        }
                }
                
                if (!$a_prevent_aggregation)
                {
                        $news = $this->aggregateForums($news);
                }
                else if ($a_forum_group_sequences)
                {
                        $news = $this->aggregateForums($news, true);
                }
                
                return $news;
        }
        
        function getAggregatedNewsData($a_ref_id, $a_only_public = false, $a_time_period = 0,
        $a_prevent_aggregation = false, $a_starting_date = "", $a_no_auto_generated = false,
                $a_user_id = null, $a_limit = 0, $a_exclude = array())
        {
                global $tree, $ilAccess, $ilObjDataCache;
                
                // get news of parent object
                
                $data = array();
                
                // get subtree
                $cur_node = $tree->getNodeData($a_ref_id);
 
                // do not check for lft (materialized path)
                if($cur_node)
                {
                        $nodes = (array) $tree->getSubTree($cur_node,true);
                }
                else
                {
                        $nodes = array();
                }
                
                // preload object data cache
                $ref_ids = array();
                $obj_ids = array();
                foreach($nodes as $node)
                {
                        $ref_ids[] = $node["child"];
                        $obj_ids[] = $node["obj_id"];
                }
 
                $ilObjDataCache->preloadReferenceCache($ref_ids);
                if (!$a_only_public)
                {
                        include_once "Services/Object/classes/class.ilObjectActivation.php";
                        ilObjectActivation::preloadData($ref_ids);
                }
                
                // no check, for which of the objects any news are available
        $news_obj_ids = ilNewsItem::filterObjIdsPerNews($obj_ids, $a_time_period, $a_starting_date);
                //$news_obj_ids = $obj_ids;
                
                // get news for all subtree nodes
                $contexts = array();
                foreach($nodes as $node)
                {
                        // only go on, if news are available
                        if (!in_array($node["obj_id"], $news_obj_ids))
                        {
                                continue;
                        }
                        
                        if (!$a_only_public)
                        {
                                if(!$a_user_id)
                                {
                                        $acc = $ilAccess->checkAccess("read", "", $node["child"]);
                                }
                                else
                                {
                                        $acc = $ilAccess->checkAccessOfUser($a_user_id, "read", "",
                                                $node["child"]);
                                }                               
                                if (!$acc)
                                {
                                        continue;
                                }
                        }
                        
                        $ref_id[$node["obj_id"]] = $node["child"];
                        $contexts[] = array("obj_id" => $node["obj_id"],
                                "obj_type" => $node["type"]);
                }
                
                // sort and return
                $news = $this->queryNewsForMultipleContexts($contexts, $a_only_public, $a_time_period,
            $a_starting_date, $a_no_auto_generated, $a_user_id, $a_limit, $a_exclude);
                                
                $to_del = array();
                foreach ($news as $k => $v)
                {
                        $news[$k]["ref_id"] = $ref_id[$v["context_obj_id"]];
                }
                
                $data = ilNewsItem::mergeNews($data, $news);
        $data = ilUtil::sortArray($data, "creation_date", "desc", false, true);
                
                if (!$a_prevent_aggregation)
                {
                        $data = $this->aggregateFiles($data, $a_ref_id);
                }
                                
                return $data;
        }
        
        function aggregateForums($news, $a_group_posting_sequence = false)
        {
                $to_del = array();
                $forums = array();
                
                // aggregate
                foreach ($news as $k => $v)
                {
                        if ($a_group_posting_sequence && $last_aggregation_forum > 0 &&
                                $last_aggregation_forum != $news[$k]["context_obj_id"])
                        {
                                $forums[$last_aggregation_forum] = "";
                        }
 
                        if ($news[$k]["context_obj_type"] == "frm")
                        {
                                if ($forums[$news[$k]["context_obj_id"]] == "")
                                {
                                        // $forums[forum_id] = news_id;
                                        $forums[$news[$k]["context_obj_id"]] = $k;
                                        $last_aggregation_forum = $news[$k]["context_obj_id"];
                                }
                                else
                                {
                                        $to_del[] = $k;
                                }
                                
                                $news[$k]["no_context_title"] = true;
                                
                                // aggregate every forum into it's "k" news
                                $news[$forums[$news[$k]["context_obj_id"]]]["aggregation"][$k]
                                        = $news[$k];
                                $news[$k]["agg_ref_id"]
                                        = $news[$k]["ref_id"];
                                $news[$k]["content"] = "";
                                $news[$k]["content_long"] = "";
                        }
                }
                
                // delete double entries
                foreach($to_del as $k)
                {
                        unset($news[$k]);
                }
//var_dump($news[14]["aggregation"]);
 
                
                return $news;
        }
        
        function aggregateFiles($news, $a_ref_id)
        {
                $first_file = "";
                $to_del = array();
                foreach ($news as $k => $v)
                {
                        // aggregate file related news
                        if ($news[$k]["context_obj_type"] == "file")
                        {
                                if ($first_file == "")
                                {
                                        $first_file = $k;
                                }
                                else
                                {
                                        $to_del[] = $k;
                                }
                                $news[$first_file]["aggregation"][$k] = $news[$k];
                                $news[$first_file]["agg_ref_id"] = $a_ref_id;
                                $news[$first_file]["ref_id"] = $a_ref_id;
                        }
                }
                
                foreach($to_del as $v)
                {
                        unset($news[$v]);
                }
                
                return $news;
        }
 
        
        function getAggregatedChildNewsData($a_ref_id, $a_only_public = false,
                $a_time_period = 0, $a_prevent_aggregation = false, $a_starting_date = "",
        $a_no_auto_generated = false)
        {
                global $tree, $ilAccess;
                
                // get news of parent object
                $data = $this->getNewsForRefId($a_ref_id, $a_only_public, true, $a_time_period,
                        true, false, false, $a_no_auto_generated);
                foreach ($data as $k => $v)
                {
                        $data[$k]["ref_id"] = $a_ref_id;
                }
 
                // get childs
                $nodes = $tree->getChilds($a_ref_id);
                
                // no check, for which of the objects any news are available
                $obj_ids = array();
                foreach($nodes as $node)
                {
                        $obj_ids[] = $node["obj_id"];
                }
        $news_obj_ids = ilNewsItem::filterObjIdsPerNews($obj_ids, $a_time_period, $a_starting_date);
                //$news_obj_ids = $obj_ids;
 
                // get news for all subtree nodes
                $contexts = array();
                foreach($nodes as $node)
                {
                        // only go on, if news are available
                        if (!in_array($node["obj_id"], $news_obj_ids))
                        {
                                continue;
                        }
 
                        if (!$a_only_public && !$ilAccess->checkAccess("read", "", $node["child"]))
                        {
                                continue;
                        }
                        $ref_id[$node["obj_id"]] = $node["child"];
                        $contexts[] = array("obj_id" => $node["obj_id"],
                                "obj_type" => $node["type"]);
                }
                
                $news = $this->queryNewsForMultipleContexts($contexts, $a_only_public, $a_time_period,
            $a_starting_date, $a_no_auto_generated);
                foreach ($news as $k => $v)
                {
                        $news[$k]["ref_id"] = $ref_id[$v["context_obj_id"]];
                }
                $data = ilNewsItem::mergeNews($data, $news);
                
                // sort and return
        $data = ilUtil::sortArray($data, "creation_date", "desc", false, true);
                
                if (!$a_prevent_aggregation)
                {
                        $data = $this->aggregateFiles($data, $a_ref_id);
                }
                
                return $data;
        }
 
        function setContext($a_obj_id, $a_obj_type, $a_sub_obj_id = 0, $a_sub_obj_type = "")
        {
                $this->setContextObjId($a_obj_id);
                $this->setContextObjType($a_obj_type);
                $this->setContextSubObjId($a_sub_obj_id);
                $this->setContextSubObjType($a_sub_obj_type);
        }
        
        protected static function handleTimePeriod($a_time_period)
        {
                // time period is number of days
                if(is_numeric($a_time_period))
                {
                        if($a_time_period > 0)
                        {
                                return date('Y-m-d H:i:s', time() - ($a_time_period * 24 * 60 * 60));
                        }
                }
                // time period is datetime
                else if(preg_match("/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/", $a_time_period))
                {                       
                        return $a_time_period;
                }
                // :TODO: what to return?               
        }
 
        public function queryNewsForContext($a_for_rss_use = false, $a_time_period = 0,
        $a_starting_date = "", $a_no_auto_generated = false, $a_oldest_first = false, $a_limit = 0)
        {
                global $ilDB, $ilUser, $lng;
 
                $and = "";
                if ($a_time_period > 0)
                {
                        $limit_ts = self::handleTimePeriod($a_time_period);
                        $and = " AND creation_date >= ".$ilDB->quote($limit_ts, "timestamp")." ";
                }
                
                if ($a_starting_date != "")
                {
                        $and.= " AND creation_date > ".$ilDB->quote($a_starting_date, "timestamp")." ";
                }
 
                if ($a_no_auto_generated)
                {
                        $and.= " AND priority = 1 AND content_type = ".$ilDB->quote("text", "text")." ";
                }
 
                // this is changed with 4.1 (news table for lm pages)
                if ($this->getContextSubObjId() > 0)
                {
                        $and.= " AND context_sub_obj_id = ".$ilDB->quote($this->getContextSubObjId(), "integer").
                                " AND context_sub_obj_type = ".$ilDB->quote($this->getContextSubObjType(), "text");
                }
 
                $ordering = ($a_oldest_first)
            ? " creation_date ASC, id ASC "
            : " creation_date DESC, id DESC ";
 
                if ($a_for_rss_use && ilNewsItem::getPrivateFeedId() == false)
                {
                        $query = "SELECT * ".
                                "FROM il_news_item ".
                                " WHERE ".
                                        "context_obj_id = ".$ilDB->quote($this->getContextObjId(), "integer").
                                        " AND context_obj_type = ".$ilDB->quote($this->getContextObjType(), "text").
                                        $and.
                                        " ORDER BY ".$ordering;
                }
                elseif (ilNewsItem::getPrivateFeedId() != false) 
                {
                        $query = "SELECT il_news_item.* ".
                                ", il_news_read.user_id user_read ".
                                "FROM il_news_item LEFT JOIN il_news_read ".
                                "ON il_news_item.id = il_news_read.news_id AND ".
                                " il_news_read.user_id = ".$ilDB->quote(ilNewsItem::getPrivateFeedId(), "integer").
                                " WHERE ".
                                        "context_obj_id = ".$ilDB->quote($this->getContextObjId(), "integer").
                                        " AND context_obj_type = ".$ilDB->quote($this->getContextObjType(), "text").
                                        $and.
                                        " ORDER BY ".$ordering;
                }
                else
                {
                        $query = "SELECT il_news_item.* ".
                                ", il_news_read.user_id as user_read ".
                                "FROM il_news_item LEFT JOIN il_news_read ".
                                "ON il_news_item.id = il_news_read.news_id AND ".
                                " il_news_read.user_id = ".$ilDB->quote($ilUser->getId(), "integer").
                                " WHERE ".
                                        "context_obj_id = ".$ilDB->quote($this->getContextObjId(), "integer").
                                        " AND context_obj_type = ".$ilDB->quote($this->getContextObjType(), "text").
                                        $and.
                                        " ORDER BY ".$ordering;
                }
//echo $query;
                $set = $ilDB->query($query);
                $result = array();
                while($rec = $ilDB->fetchAssoc($set))
                {
                        if ($a_limit > 0 && count($result) >= $a_limit)
                        {
                                continue;
                        }
                        if (!$a_for_rss_use ||  (ilNewsItem::getPrivateFeedId() != false) || ($rec["visibility"] == NEWS_PUBLIC ||
                                ($rec["priority"] == 0 &&
                                ilBlockSetting::_lookup("news", "public_notifications",
                                0, $rec["context_obj_id"]))))
                        {
                                $result[$rec["id"]] = $rec;
                        }
                }
 
                // do we get data for rss and may the time limit by an issue?
                // do a second query without time limit.
                // this is not very performant, but I do not have a better
                // idea. The keep_rss_min setting is currently (Jul 2012) only set
                // by mediacasts
                if ($a_time_period != "" && $a_for_rss_use)
                {
                        include_once("./Services/Block/classes/class.ilBlockSetting.php");
                        $keep_rss_min = ilBlockSetting::_lookup("news", "keep_rss_min",
                                0, $this->getContextObjId());
                        if ($keep_rss_min > 0)
                        {
                                return $this->queryNewsForContext(true, 0,
                                        $a_starting_date, $a_no_auto_generated, $a_oldest_first, $keep_rss_min);
                        }
                }
 
                return $result;
 
        }
 
        public function checkNewsExistsForGroupCourse($a_ref_id, $a_time_period = 1)
        {
                global $tree, $ilDB;
                
                $all = array();
 
                if(!$tree->isDeleted($a_ref_id))
                {
                        // parse repository branch of group
                        $nodes = array();
                        $node = $tree->getNodeData($a_ref_id);                                  
                        foreach($tree->getSubTree($node) as $child)
                        {
                                if($child["type"] != "rolf")
                                {
                                        $nodes[$child["obj_id"]] = $child["type"];
                                }
                        }
 
                        $limit_ts = self::handleTimePeriod($a_time_period);
 
                        // are there any news items for relevant objects and?
                        $query = $ilDB->query("SELECT id,context_obj_id,context_obj_type".
                                " FROM il_news_item".
                                " WHERE ".$ilDB->in("context_obj_id", array_keys($nodes), false, "integer").
                                " AND creation_date >= ".$ilDB->quote($limit_ts, "timestamp"));
                        while($rec = $ilDB->fetchAssoc($query))
                        {
                                if ($nodes[$rec["context_obj_id"]] == $rec["context_obj_type"])
                                {
                                        $all[] = $rec["id"];
                                }
                        }               
                }
                
                return $all;            
        }
        
        public function queryNewsForMultipleContexts($a_contexts, $a_for_rss_use = false,
        $a_time_period = 0, $a_starting_date = "", $a_no_auto_generated = false,
                $a_user_id = null, $a_limit = 0, $a_exclude = array())
        {
                global $ilDB, $ilUser, $lng, $ilCtrl;
 
                $and = "";
                if ($a_time_period > 0)
                {
                        $limit_ts = self::handleTimePeriod($a_time_period);
                        $and = " AND creation_date >= ".$ilDB->quote($limit_ts, "timestamp")." ";
                }
                        
                if ($a_starting_date != "")
                {
                        $and.= " AND creation_date > ".$ilDB->quote($a_starting_date, "timestamp")." ";
                }
 
                if ($a_no_auto_generated)
                {
                        $and.= " AND priority = 1 AND content_type = ".$ilDB->quote("text", "text")." ";
                }
 
                if ($a_limit > 0)
                {
                        $ilDB->setLimit($a_limit, 0);
                }
 
                if (is_array($a_exclude) && count($a_exclude) > 0)
                {
                        $and.= " AND ".$ilDB->in("id", $a_exclude, true, "integer")." ";
                }
 
                $ids = array();
                $type = array();
 
                foreach($a_contexts as $cont)
                {
                        $ids[] = $cont["obj_id"];
                        $type[$cont["obj_id"]] = $cont["obj_type"];
                }
                
                if ($a_for_rss_use && ilNewsItem::getPrivateFeedId() == false)
                {
                        $query = "SELECT * ".
                                "FROM il_news_item ".
                                " WHERE ".
                                        $ilDB->in("context_obj_id", $ids, false, "integer")." ".
                                        $and.
                    " ORDER BY creation_date DESC ";
                }
                elseif (ilNewsItem::getPrivateFeedId() != false) 
                {
                        $query = "SELECT il_news_item.* ".
                                ", il_news_read.user_id as user_read ".
                                "FROM il_news_item LEFT JOIN il_news_read ".
                                "ON il_news_item.id = il_news_read.news_id AND ".
                                " il_news_read.user_id = ".$ilDB->quote(ilNewsItem::getPrivateFeedId(), "integer").
                                " WHERE ".
                                        $ilDB->in("context_obj_id", $ids, false, "integer")." ".
                                        $and.
                    " ORDER BY creation_date DESC ";
                }               
                else
                {
                        if($a_user_id)
                        {
                                $user_id = $a_user_id;
                        }
                        else
                        {
                                $user_id = $ilUser->getId();
                        }
                        $query = "SELECT il_news_item.* ".
                                ", il_news_read.user_id as user_read ".
                                "FROM il_news_item LEFT JOIN il_news_read ".
                                "ON il_news_item.id = il_news_read.news_id AND ".
                                " il_news_read.user_id = ".$ilDB->quote($user_id, "integer").
                                " WHERE ".
                                        $ilDB->in("context_obj_id", $ids, false, "integer")." ".
                                        $and.
                    " ORDER BY creation_date DESC ";
                }
 
                $set = $ilDB->query($query);
                $result = array();
                while($rec = $ilDB->fetchAssoc($set))
                {
                        if ($type[$rec["context_obj_id"]] == $rec["context_obj_type"])
                        {
                                if (!$a_for_rss_use || ilNewsItem::getPrivateFeedId() != false || ($rec["visibility"] == NEWS_PUBLIC ||
                                        ($rec["priority"] == 0 &&
                                        ilBlockSetting::_lookup("news", "public_notifications",
                                        0, $rec["context_obj_id"]))))
                                {
                                        $result[$rec["id"]] = $rec;
                                }
                        }
                }
 
                return $result;
 
        }
 
 
        static function _setRead($a_user_id, $a_news_id)
        {
                global $ilDB, $ilAppEventHandler;
                
                $ilDB->replace("il_news_read",
                        array(
                                "user_id" => array("integer", $a_user_id),
                                "news_id" => array("integer", $a_news_id)
                                ),
                        array()
                        );
                
                /*
                $ilDB->manipulate("DELETE FROM il_news_read WHERE ".
                        "user_id = ".$ilDB->quote($a_user_id, "integer").
                        " AND news_id = ".$ilDB->quote($a_news_id, "integer"));
                $ilDB->manipulate("INSERT INTO il_news_read (user_id, news_id) VALUES (".
                        $ilDB->quote($a_user_id, "integer").",".
                        $ilDB->quote($a_news_id, "integer").")");*/
 
                $ilAppEventHandler->raise("Services/News", "readNews",
                        array("user_id" => $a_user_id, "news_ids" => array($a_news_id)));
        }
        
        static function _setUnread($a_user_id, $a_news_id)
        {
                global $ilDB, $ilAppEventHandler;
                
                $ilDB->manipulate("DELETE FROM il_news_read (user_id, news_id) VALUES (".
                        " WHERE user_id = ".$ilDB->quote($a_user_id, "integer").
                        " AND news_id = ".$ilDB->quote($a_news_id, "integer"));
 
                $ilAppEventHandler->raise("Services/News", "unreadNews",
                        array("user_id" => $a_user_id, "news_ids" => array($a_news_id)));
        }
        
        static function mergeNews($n1, $n2)
        {
                foreach($n2 as $id => $news)
                {
                        $n1[$id] = $news;
                }
                
                return $n1;
        }
        
        static function _getDefaultVisibilityForRefId($a_ref_id)
        {
                global $tree, $ilSetting;
 
                include_once("./Services/Block/classes/class.ilBlockSetting.php");
 
                $news_set = new ilSetting("news");
                $default_visibility = ($news_set->get("default_visibility") != "")
                                ? $news_set->get("default_visibility")
                                : "users";
 
                if ($tree->isInTree($a_ref_id))
                {
                        $path = $tree->getPathFull($a_ref_id);
                        
                        foreach ($path as $key => $row)
                        {
                                if (!in_array($row["type"], array("root", "cat","crs", "fold", "grp")))
                                {
                                        continue;
                                }
 
                                $visibility = ilBlockSetting::_lookup("news", "default_visibility",
                                        0, $row["obj_id"]);
                                        
                                if ($visibility != "")
                                {
                                        $default_visibility = $visibility;
                                }
                        }
                }
                
                return $default_visibility;
        }
        
        
        public function delete()
        {
                global $ilDB;
                
                // delete il_news_read entries
                $ilDB->manipulate("DELETE FROM il_news_read ".
                        " WHERE news_id = ".$ilDB->quote($this->getId(), "integer"));
                
                // delete multimedia object
                $mob = $this->getMobId();
                
                // delete 
                $query = "DELETE FROM il_news_item".
                        " WHERE id = ".$ilDB->quote($this->getId(), "integer");
                $ilDB->manipulate($query);
                
                // delete mob after news, to have a "mob usage" of 0
                if ($mob > 0 and ilObject::_exists($mob))
                {
                        include_once("./Services/MediaObjects/classes/class.ilObjMediaObject.php");
                        $mob = new ilObjMediaObject($mob);
                        $mob->delete();
                }
        }
        
        static public function deleteNewsOfContext($a_context_obj_id,
                $a_context_obj_type, $a_context_sub_obj_id = 0, $a_context_sub_obj_type = "")
        {
                global $ilDB;
                
                if ($a_context_obj_id == 0 || $a_context_obj_type == "")
                {
                        return;
                }
 
                if ($a_context_sub_obj_id > 0)
                {
                        $and = " AND context_sub_obj_id = ".$ilDB->quote($a_context_sub_obj_id, "integer").
                                " AND context_sub_obj_type = ".$ilDB->quote($a_context_sub_obj_type, "text");
                }
                
                // get news records
                $query = "SELECT * FROM il_news_item".
                        " WHERE context_obj_id = ".$ilDB->quote($a_context_obj_id, "integer").
                        " AND context_obj_type = ".$ilDB->quote($a_context_obj_type, "text").
                        $and;
 
                $news_set = $ilDB->query($query);
                
                while ($news = $ilDB->fetchAssoc($news_set))
                {
                        $news_obj = new ilNewsItem($news["id"]);
                        $news_obj->delete();
                }
        }
 
        static function _lookupTitle($a_news_id)
        {
                global $ilDB;
                
                $query = "SELECT title FROM il_news_item WHERE id = ".
                        $ilDB->quote($a_news_id, "integer");
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
                return $rec["title"];
        }
 
        static function _lookupVisibility($a_news_id)
        {
                global $ilDB;
                
                $query = "SELECT visibility FROM il_news_item WHERE id = ".
                        $ilDB->quote($a_news_id, "integer");
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
 
                return $rec["visibility"];
        }
 
        static function _lookupMobId($a_news_id)
        {
                global $ilDB;
 
                $query = "SELECT mob_id FROM il_news_item WHERE id = ".
                        $ilDB->quote($a_news_id, "integer");
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
                return $rec["mob_id"];
        }
 
        static function filterObjIdsPerNews($a_obj_ids, $a_time_period = 0, $a_starting_date = "",$a_ending_date = '', $ignore_period = false)
        {
                global $ilDB;
 
                $and = "";
                if ($a_time_period > 0)
                {
                        $limit_ts = self::handleTimePeriod($a_time_period);
                        $and = " AND creation_date >= ".$ilDB->quote($limit_ts, "timestamp")." ";
                }
 
                if ($a_starting_date != "")
                {
                        $and.= " AND creation_date >= ".$ilDB->quote($a_starting_date, "timestamp");
                }
 
                $query = "SELECT DISTINCT(context_obj_id) AS obj_id FROM il_news_item".
                        " WHERE ".$ilDB->in("context_obj_id", $a_obj_ids, false, "integer")." ".$and;
                        //" WHERE context_obj_id IN (".implode(ilUtil::quoteArray($a_obj_ids),",").")".$and;
 
                $set = $ilDB->query($query);
                $objs = array();
                while($rec = $ilDB->fetchAssoc($set))
                {
                        $objs[] = $rec["obj_id"];
                }
 
                return $objs;
        }
        
        static function determineNewsTitle($a_context_obj_type, $a_title, $a_content_is_lang_var,
                $a_agg_ref_id = 0, $a_aggregation = "")
        {
                global $lng;
 
                if ($a_agg_ref_id > 0)
                {
                        $cnt = count($a_aggregation);
                        
                        // forums
                        if ($a_context_obj_type == "frm")
                        {
                                if ($cnt > 1)
                                {
                                        return sprintf($lng->txt("news_x_postings"), $cnt);
                                }
                                else
                                {
                                        return $lng->txt("news_1_postings");
                                }
                        }
                        else    // files
                        {
                                $up_cnt = $cr_cnt = 0;
                                foreach($a_aggregation as $item)
                                {
                                        if ($item["title"] == "file_updated")
                                        {
                                                $up_cnt++;
                                        }
                                        else
                                        {
                                                $cr_cnt++;
                                        }
                                }
                                $sep = "";
                                if ($cr_cnt == 1)
                                {
                                        $tit = $lng->txt("news_1_file_created");
                                        $sep = "<br />";
                                }
                                else if ($cr_cnt > 1)
                                {
                                        $tit = sprintf($lng->txt("news_x_files_created"), $cr_cnt);
                                        $sep = "<br />";
                                }
                                if ($up_cnt == 1)
                                {
                                        $tit .= $sep.$lng->txt("news_1_file_updated");
                                }
                                else if ($up_cnt > 1)
                                {
                                        $tit .= $sep.sprintf($lng->txt("news_x_files_updated"), $up_cnt);
                                }
                                return $tit;
                        }
                }
                else
                {
                        if ($a_content_is_lang_var)
                        {
                                return $lng->txt($a_title);
                        }
                        else
                        {
                                return $a_title;
                        }
                }
                
                return "";
        }
 
        static function determineNewsContent($a_context_obj_type, $a_content, $a_is_lang_var)
        {
                global $lng;
 
                if ($a_is_lang_var)
                {
                        $lng->loadLanguageModule($a_context_obj_type);
                        return $lng->txt($a_content);
                }
                else
                {
                        return $a_content;
                }
        }
 
        
        
        static function getFirstNewsIdForContext($a_context_obj_id,
                $a_context_obj_type, $a_context_sub_obj_id = "", $a_context_sub_obj_type = "")
        {
                global $ilDB;
                
                // Determine how many rows should be deleted
                $query = "SELECT * ".
                        "FROM il_news_item ".
                        "WHERE ".
                                "context_obj_id = ".$ilDB->quote($a_context_obj_id, "integer").
                                " AND context_obj_type = ".$ilDB->quote($a_context_obj_type, "text").
                                " AND context_sub_obj_id = ".$ilDB->quote($a_context_sub_obj_id, "integer").
                                " AND ".$ilDB->equals("context_sub_obj_type", $a_context_sub_obj_type, "text", true);
                                
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
                
                return $rec["id"];
        }
 
        static function getLastNewsIdForContext($a_context_obj_id,
                $a_context_obj_type, $a_context_sub_obj_id = "", $a_context_sub_obj_type = "",
                $a_only_today = false)
        {
                global $ilDB;
 
                // Determine how many rows should be deleted
                $query = "SELECT id, update_date ".
                        "FROM il_news_item ".
                        "WHERE ".
                                "context_obj_id = ".$ilDB->quote($a_context_obj_id, "integer").
                                " AND context_obj_type = ".$ilDB->quote($a_context_obj_type, "text").
                                " AND context_sub_obj_id = ".$ilDB->quote($a_context_sub_obj_id, "integer").
                                " AND ".$ilDB->equals("context_sub_obj_type", $a_context_sub_obj_type, "text", true).
                        " ORDER BY update_date DESC";
 
                $ilDB->setLimit(1);
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
 
                $id = (int) $rec["id"];
                if ($a_only_today)
                {
                        $now = ilUtil::now();
                        if (substr($now, 0, 10) != substr($rec["update_date"], 0, 10))
                        {
                                $id = 0;
                        }
                }
 
                return $id;
        }
 
 
        static function _lookupMediaObjectUsages($a_mob_id)
        {
                global $ilDB;
                
                $query = "SELECT * ".
                        "FROM il_news_item ".
                        "WHERE ".
                                " mob_id = ".$ilDB->quote($a_mob_id, "integer");
                                
                $usages = array();
                $set = $ilDB->query($query);
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        $usages[$rec["id"]] = array("type" => "news", "id" => $rec["id"]);
                }
                
                return $usages;
        }
 
        static function _lookupContextObjId($a_news_id)
        {
                global $ilDB;
                
                $query = "SELECT * ".
                        "FROM il_news_item ".
                        "WHERE ".
                                " id = ".$ilDB->quote($a_news_id, "integer");
                $set = $ilDB->query($query);
                $rec = $ilDB->fetchAssoc($set);
                
                return $rec["context_obj_id"];
        }
 
        static function _lookupDefaultPDPeriod()
        {
                $news_set = new ilSetting("news");
                $per = $news_set->get("pd_period");
                if ($per == 0)
                {
                        $per = 30;
                }
                
                return $per;
        }
 
        static function _lookupUserPDPeriod($a_user_id)
        {
                $news_set = new ilSetting("news");
                $allow_shorter_periods = $news_set->get("allow_shorter_periods");
                $allow_longer_periods = $news_set->get("allow_longer_periods");
                $default_per = ilNewsItem::_lookupDefaultPDPeriod();
                
                include_once("./Services/Block/classes/class.ilBlockSetting.php");
                $per = ilBlockSetting::_lookup("pdnews", "news_pd_period",
                        $a_user_id, 0);
 
                // news period information
                if ($per <= 0 ||
                        (!$allow_shorter_periods && ($per < $default_per)) ||
                        (!$allow_longer_periods && ($per > $default_per))
                        )
                {
                        $per = $default_per;
                }
                
                return $per;
        }
        
        static function _lookupRSSPeriod()
        {
                $news_set = new ilSetting("news");
                $rss_period = $news_set->get("rss_period");
                if ($rss_period == 0)           // default to two weeks
                {
                        $rss_period = 14;
                }
                return $rss_period;
        }
        static function setPrivateFeedId ($a_userId)
        {
                ilNewsItem::$privFeedId = $a_userId;
        }
 
        static function getPrivateFeedId () {
 
                return ilNewsItem::$privFeedId;
        }
        
        function deliverMobFile($a_purpose = "Standard", $a_increase_download_cnt = false)
        {
                $mob = $this->getMobId();
                include_once("./Services/MediaObjects/classes/class.ilObjMediaObject.php");
                $mob = new ilObjMediaObject($mob);
                $mob_dir = ilObjMediaObject::_getDirectory($mob->getId());
                
                // check purpose
                if (!$mob->hasPurposeItem($a_purpose))
                {
                        return false;
                }
                
                $m_item = $mob->getMediaItem($a_purpose);
                if ($m_item->getLocationType() != "Reference")
                {
                    $file = $mob_dir."/".$m_item->getLocation();
                    if (file_exists($file) && is_file($file))
                    {
                        if ($a_increase_download_cnt)
                        {
                                $this->increaseDownloadCounter();
                        }
                        ilUtil::deliverFile($file, $m_item->getLocation(), "", false, false, false);
                                return true;
                    }
                    else
                    {
                        ilUtil::sendFailure("File not found!",true);
                        return false;
                    }
                }
                else 
                {
                        if ($a_increase_download_cnt)
                        {
                                $this->increaseDownloadCounter();
                        }
                    ilUtil::redirect($m_item->getLocation());
                }
        }
        
        function increaseDownloadCounter()
        {
                global $ilDB;
 
                $cnt = $this->getMobDownloadCounter();
                $cnt++;
                $this->setMobDownloadCounter($cnt);
                $ilDB->manipulate("UPDATE il_news_item SET ".
                        " mob_cnt_download = ".$ilDB->quote($cnt, "integer").
                        " WHERE id = ".$ilDB->quote($this->getId(), "integer")
                        );
        }
        
        function increasePlayCounter()
        {
                global $ilDB;
 
                $cnt = $this->getMobPlayCounter();
                $cnt++;
                $this->setMobPlayCounter($cnt);
                $ilDB->manipulate("UPDATE il_news_item SET ".
                        " mob_cnt_play = ".$ilDB->quote($cnt, "integer").
                        " WHERE id = ".$ilDB->quote($this->getId(), "integer")
                        );              
        }
 
        static function prepareNewsDataFromCache($a_cres)
        {
                global $ilDB;
 
                $data = $a_cres;
                $news_ids = array_keys($data);
                $set = $ilDB->query("SELECT id FROM il_news_item ".
                        " WHERE ".$ilDB->in("id", $news_ids, false, "integer"));
                $existing_ids = array();
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        $existing_ids[] = $rec["id"];
                }
                //var_dump($existing_ids);
                $existing_news = array();
                foreach ($data as $k => $v)
                {
                        if (in_array($k, $existing_ids))
                        {
                                $existing_news[$k] = $v;
                        }
                }
 
                //var_dump($data);
                //var_dump($existing_news);
 
                return $existing_news;
        }
 
}
?>