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File: EstimatedDocumentCount.php
<?php /* * Copyright 2015-present MongoDB, Inc. * * 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 MongoDB\Operation; use MongoDB\Driver\Exception\CommandException; use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException; use MongoDB\Driver\ReadConcern; use MongoDB\Driver\ReadPreference; use MongoDB\Driver\Server; use MongoDB\Driver\Session; use MongoDB\Exception\InvalidArgumentException; use MongoDB\Exception\UnexpectedValueException; use MongoDB\Exception\UnsupportedException; use function array_intersect_key; use function is_integer; use function MongoDB\server_supports_feature; /** * Operation for obtaining an estimated count of documents in a collection * * @api * @see \MongoDB\Collection::estimatedDocumentCount() * @see http://docs.mongodb.org/manual/reference/command/count/ */ class EstimatedDocumentCount implements Executable, Explainable { /** @var string */ private $databaseName; /** @var string */ private $collectionName; /** @var array */ private $options; /** @var int */ private static $errorCodeCollectionNotFound = 26; /** @var int */ private static $wireVersionForCollStats = 12; /** * Constructs a command to get the estimated number of documents in a * collection. * * Supported options: * * * maxTimeMS (integer): The maximum amount of time to allow the query to * run. * * * readConcern (MongoDB\Driver\ReadConcern): Read concern. * * This is not supported for server versions < 3.2 and will result in an * exception at execution time if used. * * * readPreference (MongoDB\Driver\ReadPreference): Read preference. * * * session (MongoDB\Driver\Session): Client session. * * Sessions are not supported for server versions < 3.6. * * @param string $databaseName Database name * @param string $collectionName Collection name * @param array $options Command options * @throws InvalidArgumentException for parameter/option parsing errors */ public function __construct($databaseName, $collectionName, array $options = []) { $this->databaseName = (string) $databaseName; $this->collectionName = (string) $collectionName; if (isset($options['maxTimeMS']) && ! is_integer($options['maxTimeMS'])) { throw InvalidArgumentException::invalidType('"maxTimeMS" option', $options['maxTimeMS'], 'integer'); } if (isset($options['readConcern']) && ! $options['readConcern'] instanceof ReadConcern) { throw InvalidArgumentException::invalidType('"readConcern" option', $options['readConcern'], ReadConcern::class); } if (isset($options['readPreference']) && ! $options['readPreference'] instanceof ReadPreference) { throw InvalidArgumentException::invalidType('"readPreference" option', $options['readPreference'], ReadPreference::class); } if (isset($options['session']) && ! $options['session'] instanceof Session) { throw InvalidArgumentException::invalidType('"session" option', $options['session'], Session::class); } $this->options = array_intersect_key($options, ['maxTimeMS' => 1, 'readConcern' => 1, 'readPreference' => 1, 'session' => 1]); } /** * Execute the operation. * * @see Executable::execute() * @param Server $server * @return integer * @throws UnexpectedValueException if the command response was malformed * @throws UnsupportedException if collation or read concern is used and unsupported * @throws DriverRuntimeException for other driver errors (e.g. connection errors) */ public function execute(Server $server) { $command = $this->createCommand($server); if ($command instanceof Aggregate) { try { $cursor = $command->execute($server); } catch (CommandException $e) { if ($e->getCode() == self::$errorCodeCollectionNotFound) { return 0; } throw $e; } $cursor->rewind(); return $cursor->current()->n; } return $command->execute($server); } /** * Returns the command document for this operation. * * @see Explainable::getCommandDocument() * @param Server $server * @return array */ public function getCommandDocument(Server $server) { return $this->createCommand($server)->getCommandDocument($server); } private function createAggregate(): Aggregate { return new Aggregate( $this->databaseName, $this->collectionName, [ ['$collStats' => ['count' => (object) []]], ['$group' => ['_id' => 1, 'n' => ['$sum' => '$count']]], ], $this->options ); } /** @return Aggregate|Count */ private function createCommand(Server $server) { return server_supports_feature($server, self::$wireVersionForCollStats) ? $this->createAggregate() : $this->createCount(); } private function createCount(): Count { return new Count($this->databaseName, $this->collectionName, [], $this->options); } }