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<?php |
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namespace PhpDDD\Command\Handler\Locator; |
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use PhpDDD\Command\CommandInterface; |
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use PhpDDD\Command\Exception\InvalidArgumentException; |
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use PhpDDD\Command\Exception\NoCommandHandlerRegisteredException; |
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use PhpDDD\Command\Handler\CommandHandlerInterface; |
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use PhpDDD\Command\Utils\ClassUtils; |
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/** |
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* Implementation of CommandHandlerLocatorInterface |
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*/ |
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class CommandHandlerLocator implements CommandHandlerLocatorInterface |
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{ |
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/** |
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* @var CommandHandlerInterface[] |
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*/ |
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private $handlers = array(); |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCommandHandlerForCommand(CommandInterface $command) |
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{ |
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$commandClassName = get_class($command); |
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if (!$this->isCommandRegistered($commandClassName)) { |
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throw new NoCommandHandlerRegisteredException( |
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sprintf( |
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'No handler registered to handle command "%s".', |
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$commandClassName |
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) |
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); |
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} |
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return $this->handlers[strtolower($commandClassName)]; |
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} |
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/** |
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* @return CommandHandlerInterface[] |
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*/ |
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public function getRegisteredCommandHandlers() |
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{ |
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return $this->handlers; |
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} |
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/** |
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* @param string $commandClassName |
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* @param CommandHandlerInterface $commandHandler |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function register($commandClassName, CommandHandlerInterface $commandHandler) |
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{ |
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$this->assertNamingConventionSatisfied($commandClassName, get_class($commandHandler)); |
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$this->assertImplementsCommandInterface($commandClassName); |
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if ($this->isCommandRegistered($commandClassName)) { |
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throw new InvalidArgumentException( |
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sprintf( |
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'A command handler has already been defined for the command "%s". Previous handler: %s. New handler: %s', |
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$commandClassName, |
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get_class($this->handlers[strtolower($commandClassName)]), |
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get_class($commandHandler) |
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) |
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); |
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} |
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$this->handlers[strtolower($commandClassName)] = $commandHandler; |
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} |
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/** |
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* @param string $commandClassName |
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* @param string $handlerClassName |
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* |
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* @throws InvalidArgumentException |
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*/ |
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private function assertNamingConventionSatisfied($commandClassName, $handlerClassName) |
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{ |
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if (!$this->isNamingConventionSatisfied($commandClassName, $handlerClassName)) { |
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throw new InvalidArgumentException( |
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sprintf( |
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'Command Handler does not follow naming convention. Expected: "%s". "%s" given.', |
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$this->getExpectedHandlerName($commandClassName), |
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ClassUtils::shortName($handlerClassName) |
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) |
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); |
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} |
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} |
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/** |
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* @param string $commandClassName |
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* @param string $handlerClassName |
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* |
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* @return bool |
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*/ |
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private function isNamingConventionSatisfied($commandClassName, $handlerClassName) |
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{ |
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$handlerClassName = ClassUtils::shortName($handlerClassName); |
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return $this->getExpectedHandlerName($commandClassName) === $handlerClassName; |
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} |
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/** |
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* @param string $commandClassName |
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* |
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* @return string |
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*/ |
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private function getExpectedHandlerName($commandClassName) |
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{ |
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$commandClassName = ClassUtils::shortName($commandClassName); |
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if ('Command' === substr($commandClassName, -7)) { |
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$commandClassName = substr($commandClassName, 0, -7); |
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} |
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return $commandClassName.'CommandHandler'; |
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} |
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/** |
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* @param string $commandClassName |
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* |
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* @return bool |
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*/ |
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private function isCommandRegistered($commandClassName) |
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{ |
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return isset($this->handlers[strtolower($commandClassName)]); |
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} |
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/** |
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* @param string $commandClassName |
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*/ |
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private function assertImplementsCommandInterface($commandClassName) |
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{ |
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if (!in_array('PhpDDD\\Command\\CommandInterface', class_implements($commandClassName), true)) { |
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throw new InvalidArgumentException( |
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sprintf( |
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'The class %s must implements the PhpDDD\\Command\\CommandInterface.', |
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$commandClassName |
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) |
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); |
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} |
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} |
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} |
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php-ddd /
command
