IndexStructure.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryIndexer\Indexer;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\DB\Ddl\Table;
use Magento\Framework\Exception\StateException;
use Magento\InventoryMultiDimensionalIndexerApi\Model\IndexName;
use Magento\InventoryMultiDimensionalIndexerApi\Model\IndexNameResolverInterface;
use Magento\InventoryMultiDimensionalIndexerApi\Model\IndexStructureInterface;

class IndexStructure implements IndexStructureInterface
{
    const SKU = 'sku';
    const QUANTITY = 'quantity';
    const IS_SALABLE = 'is_salable';
    private $resourceConnection;

    private $indexNameResolver;

    public function __construct(
        ResourceConnection $resourceConnection,
        IndexNameResolverInterface $indexNameResolver
    ) {
        $this->resourceConnection = $resourceConnection;
        $this->indexNameResolver = $indexNameResolver;
    }

    public function isExist(IndexName $indexName, string $connectionName): bool
    {
        $connection = $this->resourceConnection->getConnection($connectionName);
        $tableName = $this->indexNameResolver->resolveName($indexName);
        return $connection->isTableExists($this->resourceConnection->getTableName($tableName));
    }

    public function create(IndexName $indexName, string $connectionName): void
    {
        $connection = $this->resourceConnection->getConnection($connectionName);
        $tableName = $this->indexNameResolver->resolveName($indexName);

        if ($connection->isTableExists($tableName)) {
            throw new StateException(__('Table %table already exits', ['table' => $tableName]));
        }

        $this->createTable($connection, $tableName);
    }

    private function createTable(\Magento\Framework\DB\Adapter\AdapterInterface $connection, string $tableName)
    {
        $table = $connection->newTable(
            $this->resourceConnection->getTableName($tableName)
        )->setComment(
            'Inventory Stock item Table'
        )->addColumn(
            self::SKU,
            Table::TYPE_TEXT,
            64,
            [
                Table::OPTION_PRIMARY => true,
                Table::OPTION_NULLABLE => false,
            ],
            'Sku'
        )->addColumn(
            self::QUANTITY,
            Table::TYPE_DECIMAL,
            null,
            [
                Table::OPTION_UNSIGNED => false,
                Table::OPTION_NULLABLE => false,
                Table::OPTION_DEFAULT => 0,
                Table::OPTION_PRECISION => 10,
                Table::OPTION_SCALE => 4,
            ],
            'Quantity'
        )->addColumn(
            self::IS_SALABLE,
            Table::TYPE_BOOLEAN,
            null,
            [
                Table::OPTION_NULLABLE => false,
            ],
            'Is Salable'
        );
        $connection->createTable($table);
    }

    public function delete(IndexName $indexName, string $connectionName): void
    {
        $connection = $this->resourceConnection->getConnection($connectionName);
        $tableName = $this->indexNameResolver->resolveName($indexName);
        $connection->dropTable($this->resourceConnection->getTableName($tableName));
    }
}