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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 $Id$
*
* @package Piwik_DataTable
*/
/**
* 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_DataTable
* @subpackage Piwik_DataTable_Filter
*/
class Piwik_DataTable_Filter_ReplaceColumnNames extends Piwik_DataTable_Filter
{
/*
* old column name => new column name
*/
protected $mappingToApply = array(
Piwik_Archive::INDEX_NB_UNIQ_VISITORS => 'nb_uniq_visitors',
Piwik_Archive::INDEX_NB_VISITS => 'nb_visits',
Piwik_Archive::INDEX_NB_ACTIONS => 'nb_actions',
Piwik_Archive::INDEX_MAX_ACTIONS => 'max_actions',
Piwik_Archive::INDEX_SUM_VISIT_LENGTH => 'sum_visit_length',
Piwik_Archive::INDEX_BOUNCE_COUNT => 'bounce_count',
);
/**
* @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, $mappingToApply = null )
{
parent::__construct($table);
if(!is_null($mappingToApply))
{
$this->mappingToApply = $mappingToApply;
}
$this->filter();
}
protected function filter()
{
foreach($this->table->getRows() as $key => $row)
{
$columns = $row->getColumns();
foreach($this->mappingToApply as $oldName => $newName)
{
// if the old column is there
if(isset($columns[$oldName]))
{
$columns[$newName] = $columns[$oldName];
unset($columns[$oldName]);
}
}
$row->setColumns($columns);
}
}
}
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