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File Path : /home/dev2.destoffenstraat.com/vendor-1/magento/framework/DB/Sql/LookupExpression.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Framework\DB\Sql;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\DB\Adapter\AdapterInterface;
use Magento\Framework\DB\Select;

/**
 * Class LookupExpression
 */
class LookupExpression extends Expression
{
    /**
     * @var Resource
     */
    protected $resource;

    /**
     * @var AdapterInterface
     */
    protected $adapter;

    /**
     * @var string
     */
    protected $targetColumn;

    /**
     * @var string
     */
    protected $targetTable;

    /**
     * @var array
     */
    protected $referenceColumns;

    /**
     * @var array
     */
    protected $sortOrder;

    /**
     * @param ResourceConnection $resource
     * @param string $targetColumn
     * @param string $targetTable
     * @param array $referenceColumns
     * @param array $sortOrder
     */
    public function __construct(
        ResourceConnection $resource,
        $targetColumn,
        $targetTable,
        array $referenceColumns = [],
        array $sortOrder = []
    ) {
        $this->targetTable = $targetTable;
        $this->targetColumn = $targetColumn;
        $this->referenceColumns = $referenceColumns;
        $this->sortOrder = $sortOrder;
        $this->resource = $resource;
        $this->adapter = $this->resource->getConnection();
    }

    /**
     * Process WHERE clause
     *
     * @param Select $select
     * @return void
     */
    protected function processWhereCondition(Select $select)
    {
        foreach ($this->referenceColumns as $column => $referenceColumn) {
            $identifier = '';
            if (isset($referenceColumn['tableAlias'])) {
                $identifier = $referenceColumn['tableAlias'] . '.';
            }
            $columnName = $column;
            if (isset($referenceColumn['columnName'])) {
                $columnName = $referenceColumn['columnName'];
            }
            $select->where(
                sprintf(
                    '%s = %s',
                    $this->adapter->quoteIdentifier('lookup.' . $column),
                    $this->adapter->quoteIdentifier($identifier . $columnName)
                )
            );
        }
    }

    /**
     * Process ORDER BY clause
     *
     * @param Select $select
     * @return void
     */
    protected function processSortOrder(Select $select)
    {
        foreach ($this->sortOrder as $direction => $column) {
            if (!in_array($direction, [Select::SQL_ASC, Select::SQL_DESC])) {
                $direction = '';
            }
            $expr = new \Zend_Db_Expr(
                sprintf(
                    '%s %s',
                    $this->adapter->quoteIdentifier('lookup.' . $column),
                    $direction
                )
            );
            $select->order($expr);
        }
    }

    /**
     * Returns lookup SQL
     *
     * @return string
     */
    public function __toString()
    {
        $select = $this->adapter->select()
            ->from(['lookup' => $this->resource->getTableName($this->targetTable)], [$this->targetColumn])
            ->limit(1);
        $this->processWhereCondition($select);
        $this->processSortOrder($select);
        return sprintf('(%s)', $select->assemble());
    }
}