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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2023 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Command;
use InvalidArgumentException;
use Predis\ClientException;
use Predis\Command\Processor\ProcessorInterface;
/**
* Base command factory class.
*
* This class provides all of the common functionalities required for a command
* factory to create new instances of Redis commands objects. It also allows to
* define or undefine command handler classes for each command ID.
*/
abstract class Factory implements FactoryInterface
{
protected $commands = [];
protected $processor;
/**
* {@inheritdoc}
*/
public function supports(string ...$commandIDs): bool
{
foreach ($commandIDs as $commandID) {
if ($this->getCommandClass($commandID) === null) {
return false;
}
}
return true;
}
/**
* Returns the FQCN of a class that represents the specified command ID.
*
* @codeCoverageIgnore
*
* @param string $commandID Command ID
*
* @return string|null
*/
public function getCommandClass(string $commandID): ?string
{
return $this->commands[strtoupper($commandID)] ?? null;
}
/**
* {@inheritdoc}
*/
public function create(string $commandID, array $arguments = []): CommandInterface
{
if (!$commandClass = $this->getCommandClass($commandID)) {
$commandID = strtoupper($commandID);
throw new ClientException("Command `$commandID` is not a registered Redis command.");
}
$command = new $commandClass();
$command->setArguments($arguments);
if (isset($this->processor)) {
$this->processor->process($command);
}
return $command;
}
/**
* Defines a command in the factory.
*
* Only classes implementing Predis\Command\CommandInterface are allowed to
* handle a command. If the command specified by its ID is already handled
* by the factory, the underlying command class is replaced by the new one.
*
* @param string $commandID Command ID
* @param string $commandClass FQCN of a class implementing Predis\Command\CommandInterface
*
* @throws InvalidArgumentException
*/
public function define(string $commandID, string $commandClass): void
{
if (!is_a($commandClass, 'Predis\Command\CommandInterface', true)) {
throw new InvalidArgumentException(
"Class $commandClass must implement Predis\Command\CommandInterface"
);
}
$this->commands[strtoupper($commandID)] = $commandClass;
}
/**
* Undefines a command in the factory.
*
* When the factory already has a class handler associated to the specified
* command ID it is removed from the map of known commands. Nothing happens
* when the command is not handled by the factory.
*
* @param string $commandID Command ID
*/
public function undefine(string $commandID): void
{
unset($this->commands[strtoupper($commandID)]);
}
/**
* Sets a command processor for processing command arguments.
*
* Command processors are used to process and transform arguments of Redis
* commands before their newly created instances are returned to the caller
* of "create()".
*
* A NULL value can be used to effectively unset any processor if previously
* set for the command factory.
*
* @param ProcessorInterface|null $processor Command processor or NULL value.
*/
public function setProcessor(?ProcessorInterface $processor): void
{
$this->processor = $processor;
}
/**
* Returns the current command processor.
*
* @return ProcessorInterface|null
*/
public function getProcessor(): ?ProcessorInterface
{
return $this->processor;
}
}
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