friendica/src/BaseRepository.php

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<?php
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/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica;
use Exception;
use Friendica\Capabilities\ICanCreateFromTableRow;
use Friendica\Database\Database;
use Friendica\Database\DBA;
use Friendica\Network\HTTPException\NotFoundException;
use Psr\Log\LoggerInterface;
/**
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* Repositories are meant to store and retrieve Entities from the database.
*
* The reason why there are methods prefixed with an underscore is because PHP doesn't support generic polymorphism
* which means we can't directly overload base methods and make parameters more strict (from a parent class to a child
* class for example)
*
* Similarly, we can't make an overloaded method return type more strict until we only support PHP version 7.4 but this
* is less pressing.
*/
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abstract class BaseRepository
{
const LIMIT = 30;
/**
* @var string This should be set to the main database table name the depository is using
*/
protected static $table_name;
/** @var Database */
protected $db;
/** @var LoggerInterface */
protected $logger;
/** @var ICanCreateFromTableRow */
protected $factory;
public function __construct(Database $database, LoggerInterface $logger, ICanCreateFromTableRow $factory)
{
$this->db = $database;
$this->logger = $logger;
$this->factory = $factory;
}
/**
* Populates the collection according to the condition. Retrieves a limited subset of entities depending on the
* boundaries and the limit. The total count of rows matching the condition is stored in the collection.
*
* Depends on the corresponding table featuring a numerical auto incremented column called `id`.
*
* max_id and min_id are susceptible to the query order:
* - min_id alone only reliably works with ASC order
* - max_id alone only reliably works with DESC order
* If the wrong order is detected in either case, we reverse the query order and the entity list order after the query
*
* Chainable.
*
* @param array $condition
* @param array $params
* @param int|null $min_id Retrieve models with an id no fewer than this, as close to it as possible
* @param int|null $max_id Retrieve models with an id no greater than this, as close to it as possible
* @param int $limit
* @return BaseCollection
* @throws \Exception
*/
protected function _selectByBoundaries(
array $condition = [],
array $params = [],
int $min_id = null,
int $max_id = null,
int $limit = self::LIMIT
): BaseCollection {
$totalCount = $this->count($condition);
$boundCondition = $condition;
$reverseOrder = false;
if (isset($min_id)) {
$boundCondition = DBA::mergeConditions($boundCondition, ['`id` > ?', $min_id]);
if (!isset($max_id) && isset($params['order']['id']) && ($params['order']['id'] === true || $params['order']['id'] === 'DESC')) {
$reverseOrder = true;
$params['order']['id'] = 'ASC';
}
}
if (isset($max_id) && $max_id > 0) {
$boundCondition = DBA::mergeConditions($boundCondition, ['`id` < ?', $max_id]);
if (!isset($min_id) && (!isset($params['order']['id']) || $params['order']['id'] === false || $params['order']['id'] === 'ASC')) {
$reverseOrder = true;
$params['order']['id'] = 'DESC';
}
}
$params['limit'] = $limit;
$Entities = $this->_select($boundCondition, $params);
if ($reverseOrder) {
$Entities->reverse();
}
return new BaseCollection($Entities->getArrayCopy(), $totalCount);
}
/**
* @param array $condition
* @param array $params
* @return BaseCollection
* @throws Exception
*/
protected function _select(array $condition, array $params = []): BaseCollection
{
$rows = $this->db->selectToArray(static::$table_name, [], $condition, $params);
$Entities = new BaseCollection();
foreach ($rows as $fields) {
$Entities[] = $this->factory->createFromTableRow($fields);
}
return $Entities;
}
/**
* @param array $condition
* @param array $params
* @return BaseEntity
* @throws NotFoundException
*/
protected function _selectOne(array $condition, array $params = []): BaseEntity
{
$fields = $this->db->selectFirst(static::$table_name, [], $condition, $params);
if (!$this->db->isResult($fields)) {
throw new NotFoundException();
}
return $this->factory->createFromTableRow($fields);
}
/**
* @param array $condition
* @param array $params
* @return int
* @throws Exception
*/
public function count(array $condition, array $params = []): int
{
return $this->db->count(static::$table_name, $condition, $params);
}
/**
* @param array $condition
* @return bool
* @throws Exception
*/
public function exists(array $condition): bool
{
return $this->db->exists(static::$table_name, $condition);
}
}