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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
* @version $Id$
*
* @category Piwik
* @package Piwik
*/
/**
* This filter replaces column names using a mapping table that maps from the old name to the new name.
*
* Why this filter?
* For saving bytes in the database, you can change all the columns labels by an integer value.
* Exemple instead of saving 10000 rows with the column name 'nb_uniq_visitors' which would cost a lot of memory,
* we map it to the integer 1 before saving in the DB.
* After selecting the DataTable from the DB though, you need to restore back the real names so that
* it shows nicely in the report (XML for example).
*
* You can specify the mapping array to apply in the constructor.
*
* @package Piwik
* @subpackage Piwik_DataTable
*/
class Piwik_DataTable_Filter_ReplaceColumnNames extends Piwik_DataTable_Filter
{
protected $mappingToApply;
/**
* @param DataTable Table
* @param array Mapping to apply. Must have the format
* array( OLD_COLUMN_NAME => NEW_COLUMN NAME,
* OLD_COLUMN_NAME2 => NEW_COLUMN NAME2,
* )
*/
public function __construct( $table, $recursive = false, $mappingToApply = null )
{
parent::__construct($table);
$this->mappingToApply = Piwik_Archive::$mappingFromIdToName;
$this->applyFilterRecursively = $recursive;
if(!is_null($mappingToApply))
{
$this->mappingToApply = $mappingToApply;
}
$this->filter();
}
protected function filter()
{
$this->filterTable($this->table);
}
protected function filterTable($table)
{
foreach($table->getRows() as $key => $row)
{
$oldColumns = $row->getColumns();
$newColumns = $this->getRenamedColumns($oldColumns);
$row->setColumns( $newColumns );
if($this->applyFilterRecursively)
{
try {
$subTable = Piwik_DataTable_Manager::getInstance()->getTable( $row->getIdSubDataTable() );
$this->filterTable($subTable);
} catch(Exception $e){
// case idSubTable == null, or if the table is not loaded in memory
}
}
}
}
protected function getRenamedColumns($columns)
{
$newColumns = array();
foreach($columns as $columnName => $columnValue)
{
if(isset($this->mappingToApply[$columnName]))
{
$columnName = $this->mappingToApply[$columnName];
if($columnName == 'goals')
{
$newSubColumns = array();
foreach($columnValue as $idGoal => $goalValues)
{
foreach($goalValues as $id => $goalValue)
{
$subColumnName = Piwik_Archive::$mappingFromIdToNameGoal[$id];
$newSubColumns['idgoal='.$idGoal][$subColumnName] = $goalValue;
}
}
$columnValue = $newSubColumns;
}
}
$newColumns[$columnName] = $columnValue;
}
return $newColumns;
}
}
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