FromAssembler.php

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<?php
namespace Magento\Analytics\ReportXml\DB\Assembler;

use Magento\Analytics\ReportXml\DB\ColumnsResolver;
use Magento\Analytics\ReportXml\DB\SelectBuilder;
use Magento\Analytics\ReportXml\DB\NameResolver;
use Magento\Framework\App\ResourceConnection;

class FromAssembler implements AssemblerInterface
{
    private $nameResolver;

    private $columnsResolver;

    private $resourceConnection;

    public function __construct(
        NameResolver $nameResolver,
        ColumnsResolver $columnsResolver,
        ResourceConnection $resourceConnection
    ) {
        $this->nameResolver = $nameResolver;
        $this->columnsResolver = $columnsResolver;
        $this->resourceConnection = $resourceConnection;
    }

    public function assemble(SelectBuilder $selectBuilder, $queryConfig)
    {
        $selectBuilder->setFrom(
            [
                $this->nameResolver->getAlias($queryConfig['source']) =>
                    $this->resourceConnection
                        ->getTableName($this->nameResolver->getName($queryConfig['source'])),
            ]
        );
        $columns = $this->columnsResolver->getColumns($selectBuilder, $queryConfig['source']);
        $selectBuilder->setColumns(array_merge($selectBuilder->getColumns(), $columns));
        return $selectBuilder;
    }
}