DropTable.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Operations;

use Magento\Framework\Setup\Declaration\Schema\Db\DbSchemaWriterInterface;
use Magento\Framework\Setup\Declaration\Schema\Db\DefinitionAggregator;
use Magento\Framework\Setup\Declaration\Schema\Dto\Table;
use Magento\Framework\Setup\Declaration\Schema\ElementHistory;
use Magento\Framework\Setup\Declaration\Schema\OperationInterface;

class DropTable implements OperationInterface
{
    const OPERATION_NAME = 'drop_table';

    private $definitionAggregator;

    private $dbSchemaWriter;

    public function __construct(
        DefinitionAggregator $definitionAggregator,
        DbSchemaWriterInterface $dbSchemaWriter
    ) {
        $this->definitionAggregator = $definitionAggregator;
        $this->dbSchemaWriter = $dbSchemaWriter;
    }

    public function isOperationDestructive()
    {
        return true;
    }

    public function getOperationName()
    {
        return self::OPERATION_NAME;
    }

    public function doOperation(ElementHistory $tableHistory)
    {
        $table = $tableHistory->getOld();
        return [$this->dbSchemaWriter->dropTable($table->getName(), $table->getResource())];
    }
}