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<?php
/*
* Copyright 2015-2017 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\Command;
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 current;
use function is_array;
use function is_float;
use function is_integer;
use function is_object;
use function is_string;
use function MongoDB\server_supports_feature;
/**
* Operation for the count command.
*
* @api
* @see \MongoDB\Collection::count()
* @see http://docs.mongodb.org/manual/reference/command/count/
*/
class Count implements Executable, Explainable
{
/** @var integer */
private static $wireVersionForCollation = 5;
/** @var integer */
private static $wireVersionForReadConcern = 4;
/** @var string */
private $databaseName;
/** @var string */
private $collectionName;
/** @var array|object */
private $filter;
/** @var array */
private $options;
/**
* Constructs a count command.
*
* Supported options:
*
* * collation (document): Collation specification.
*
* This is not supported for server versions < 3.4 and will result in an
* exception at execution time if used.
*
* * hint (string|document): The index to use. Specify either the index
* name as a string or the index key pattern as a document. If specified,
* then the query system will only consider plans using the hinted index.
*
* * limit (integer): The maximum number of documents to count.
*
* * 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.
*
* * skip (integer): The number of documents to skip before returning the
* documents.
*
* @param string $databaseName Database name
* @param string $collectionName Collection name
* @param array|object $filter Query by which to filter documents
* @param array $options Command options
* @throws InvalidArgumentException for parameter/option parsing errors
*/
public function __construct($databaseName, $collectionName, $filter = [], array $options = [])
{
if (! is_array($filter) && ! is_object($filter)) {
throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
}
if (isset($options['collation']) && ! is_array($options['collation']) && ! is_object($options['collation'])) {
throw InvalidArgumentException::invalidType('"collation" option', $options['collation'], 'array or object');
}
if (isset($options['hint']) && ! is_string($options['hint']) && ! is_array($options['hint']) && ! is_object($options['hint'])) {
throw InvalidArgumentException::invalidType('"hint" option', $options['hint'], 'string or array or object');
}
if (isset($options['limit']) && ! is_integer($options['limit'])) {
throw InvalidArgumentException::invalidType('"limit" option', $options['limit'], 'integer');
}
if (isset($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', $options['session'], Session::class);
}
if (isset($options['skip']) && ! is_integer($options['skip'])) {
throw InvalidArgumentException::invalidType('"skip" option', $options['skip'], 'integer');
}
if (isset($options['readConcern']) && $options['readConcern']->isDefault()) {
unset($options['readConcern']);
}
$this->databaseName = (string) $databaseName;
$this->collectionName = (string) $collectionName;
$this->filter = $filter;
$this->options = $options;
}
/**
* 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 $server)
{
if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
throw UnsupportedException::collationNotSupported();
}
if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
throw UnsupportedException::readConcernNotSupported();
}
$inTransaction = isset($this->options['session']) && $this->options['session']->isInTransaction();
if ($inTransaction && isset($this->options['readConcern'])) {
throw UnsupportedException::readConcernNotSupportedInTransaction();
}
$cursor = $server->executeReadCommand($this->databaseName, new Command($this->createCommandDocument()), $this->createOptions());
$result = current($cursor->toArray());
// Older server versions may return a float
if (! isset($result->n) || ! (is_integer($result->n) || is_float($result->n))) {
throw new UnexpectedValueException('count command did not return a numeric "n" value');
}
return (integer) $result->n;
}
public function getCommandDocument(Server $server)
{
return $this->createCommandDocument();
}
/**
* Create the count command document.
*
* @return array
*/
private function createCommandDocument()
{
$cmd = ['count' => $this->collectionName];
if (! empty($this->filter)) {
$cmd['query'] = (object) $this->filter;
}
if (isset($this->options['collation'])) {
$cmd['collation'] = (object) $this->options['collation'];
}
if (isset($this->options['hint'])) {
$cmd['hint'] = is_array($this->options['hint']) ? (object) $this->options['hint'] : $this->options['hint'];
}
foreach (['limit', 'maxTimeMS', 'skip'] as $option) {
if (isset($this->options[$option])) {
$cmd[$option] = $this->options[$option];
}
}
return $cmd;
}
/**
* Create options for executing the command.
*
* @see http://php.net/manual/en/mongodb-driver-server.executereadcommand.php
* @return array
*/
private function createOptions()
{
$options = [];
if (isset($this->options['readConcern'])) {
$options['readConcern'] = $this->options['readConcern'];
}
if (isset($this->options['readPreference'])) {
$options['readPreference'] = $this->options['readPreference'];
}
if (isset($this->options['session'])) {
$options['session'] = $this->options['session'];
}
return $options;
}
}