TagCloudDashlet.php
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<?php
/*
* The contents of this file are subject to the KnowledgeTree Public
* License Version 1.1.2 ("License"); You may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.knowledgetree.com/KPL
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
* See the License for the specific language governing rights and
* limitations under the License.
*
* All copies of the Covered Code must include on each user interface screen:
* (i) the "Powered by KnowledgeTree" logo and
* (ii) the KnowledgeTree copyright notice
* in the same form as they appear in the distribution. See the License for
* requirements.
*
* The Original Code is: KnowledgeTree Open Source
*
* The Initial Developer of the Original Code is The Jam Warehouse Software
* (Pty) Ltd, trading as KnowledgeTree.
* Portions created by The Jam Warehouse Software (Pty) Ltd are Copyright
* (C) 2007 The Jam Warehouse Software (Pty) Ltd;
* All Rights Reserved.
* Contributor( s): ______________________________________
*
*/
require_once(KT_LIB_DIR . '/browse/browseutil.inc.php');
require_once(KT_LIB_DIR . '/plugins/pluginregistry.inc.php');
require_once(KT_LIB_DIR . '/plugins/plugin.inc.php');
class TagCloudDashlet extends KTBaseDashlet {
var $oUser;
var $sClass = 'ktBlock';
/**
* Constructor method
*
* @return TagCloudDashlet
*/
function TagCloudDashlet(){
$this->sTitle = _kt('Tag Cloud');
}
/**
* Check to see if user is active
*
* @param object $oUser
* @return boolean
*/
function is_active($oUser) {
$this->oUser = $oUser;
return true;
}
/**
* Render function for template
*
* @return unknown
*/
function render() {
$oTemplating =& KTTemplating::getSingleton();
$oTemplate = $oTemplating->loadTemplate('TagCloud/dashlet');
$aTags = & $this->get_relevant_tags();
if($aTags)
$aTags = & $this->get_tag_weightings($aTags);
$oRegistry =& KTPluginRegistry::getSingleton();
$oPlugin =& $oRegistry->getPlugin('ktcore.tagcloud.plugin');
$url = $oPlugin->getPagePath('TagCloudRedirection');
$aTemplateData = array(
'tags' => $aTags,
'url'=>$url
);
return $oTemplate->render($aTemplateData);
}
/**
* Builds the weightings for tags based on their frequency
*
* @param array $aTags
* @return array
*/
function & get_tag_weightings(&$aTags)
{
$aTags = $this->get_relevant_tags();
if (count($aTags) == 0) $min_freq=$max_freq=0;
else
{
$min_freq = min(array_values($aTags));
$max_freq = max(array_values($aTags));
}
$min_size = 12;
$max_size = 30;
$distrib = $max_freq - $min_freq;
if ($distrib == 0) $distrib=1;
$step = ($max_size - $min_size)/($distrib);
foreach($aTags as $tag=>$freq)
{
$size = ceil($min_size + (($freq - $min_freq) * $step));
$aTags[$tag] = $size;
}
return $aTags;
}
/**
* Returns the relevant tags for the current user
*
* @return array
*/
function & get_relevant_tags()
{
$aUserPermissions = KTSearchUtil::permissionToSQL($this->oUser, null);
if(PEAR::isError($aUserPermissions)) {
return false;
}
list($where, $params, $joins) = KTSearchUtil::permissionToSQL($this->oUser, null);
$sql = "
SELECT
TW.tag, count(*) as freq
FROM
document_tags DT INNER JOIN tag_words TW ON DT.tag_id=TW.id
WHERE DT.document_id in (SELECT D.id FROM documents D $joins WHERE $where) GROUP BY TW.tag";
$tags = DBUtil::getResultArray(
array($sql,$params)
);
$aTags = array();
foreach($tags as $tag)
{
$word=$tag['tag'];
$freq=$tag['freq'];
$aTags[$word] = $freq;
}
return $aTags;
}
}
?>