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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\DataTable\Filter;
use Piwik\DataTable;
use Piwik\DataTable\BaseFilter;
/**
* Executes a callback for each row of a {@link DataTable} and prepends the given value to each metadata entry
* but only if the given metadata entry exists.
*
* **Basic usage example**
*
* $dataTable->filter('PrependValueToMetadata', array('segment', 'segmentName==segmentValue'));
*
* @api
*/
class PrependValueToMetadata extends BaseFilter
{
private $metadataColumn;
private $valueToPrepend;
/**
* @param DataTable $table
* @param string $metadataName The name of the metadata that should be prepended
* @param string $valueToPrepend The value to prepend if the metadata entry exists
*/
public function __construct($table, $metadataName, $valueToPrepend)
{
parent::__construct($table);
$this->metadataColumn = $metadataName;
$this->valueToPrepend = $valueToPrepend;
}
/**
* See {@link PrependValueToMetadata}.
*
* @param DataTable $table
*/
public function filter($table)
{
if (empty($this->metadataColumn) || empty($this->valueToPrepend)) {
return;
}
$metadataColumn = $this->metadataColumn;
$valueToPrepend = $this->valueToPrepend;
$table->filter(function (DataTable $dataTable) use ($metadataColumn, $valueToPrepend) {
foreach ($dataTable->getRows() as $row) {
$filter = $row->getMetadata($metadataColumn);
if ($filter !== false) {
$row->setMetadata($metadataColumn, $valueToPrepend . $filter);
}
}
});
}
}
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