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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\DB\Select;
use Magento\Framework\DB\Select;
use Magento\Framework\DB\Platform\Quote;
/**
* Class ColumnsRenderer
*/
class ColumnsRenderer implements RendererInterface
{
/**
* @var Quote
*/
protected $quote;
/**
* @param Quote $quote
*/
public function __construct(
Quote $quote
) {
$this->quote = $quote;
}
/**
* Render COLUMNS section
*
* @param Select $select
* @param string $sql
* @return null|string
* @throws \Zend_Db_Select_Exception
*/
public function render(Select $select, $sql = '')
{
if (!count($select->getPart(Select::COLUMNS))) {
return null;
}
$columns = [];
foreach ($select->getPart(Select::COLUMNS) as $columnEntry) {
list($correlationName, $column, $alias) = $columnEntry;
if ($column instanceof \Zend_Db_Expr) {
$columns[] = $this->quote->quoteColumnAs($column, $alias);
} else {
if ($column == Select::SQL_WILDCARD) {
$column = new \Zend_Db_Expr(Select::SQL_WILDCARD);
$alias = null;
}
if (empty($correlationName)) {
$columns[] = $this->quote->quoteColumnAs($column, $alias);
} else {
$columns[] = $this->quote->quoteColumnAs([$correlationName, $column], $alias);
}
}
}
return $sql . ' ' . implode(', ', $columns);
}
}