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<?php declare(strict_types = 1);
/*
 * Copyright (c) 2019, Josef Kufner  <josef@kufner.cz>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
namespace Smalldb\StateMachine\SqlExtension;
use Doctrine\DBAL\Connection;
use Smalldb\StateMachine\AbstractSmalldbRepository;
use Smalldb\StateMachine\ReferenceInterface;
use Smalldb\StateMachine\Smalldb;
use Smalldb\StateMachine\SmalldbRepositoryInterface;
use Smalldb\StateMachine\SqlExtension\ReferenceDataSource\DataSource;
use Smalldb\StateMachine\SqlExtension\ReferenceDataSource\ReferenceQueryBuilder;
/**
 * Class AbstractSqlRepository
 *
 * This class implements a simple repository of a single entity class.
 */
abstract class AbstractSqlRepository extends AbstractSmalldbRepository implements SmalldbRepositoryInterface
{
    protected Connection $db;
    private ?DataSource $dataSource = null;
    public function __construct(Smalldb $smalldb, Connection $db)
    {
        parent::__construct($smalldb);
        $this->db = $db;
    }
    protected function getDataSource(): DataSource
    {
        return $this->dataSource ?? ($this->dataSource = $this->createDataSource());
    }
    protected function createDataSource(): DataSource
    {
        return new DataSource(null, $this->smalldb, $this->getMachineProvider(), $this->db);
    }
    protected function createQueryBuilder(string $tableAlias = 'this'): ReferenceQueryBuilder
    {
        return $this->getDataSource()->createQueryBuilder($tableAlias)
            ->addSelectFromStatements();
    }
    /**
     * Create a reference to a state machine identified by $id.
     * Override this method to use a proper return type hint.
     */
    public function ref($id): ReferenceInterface
    {
        return $this->getDataSource()->ref($id);
    }
}