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<?php |
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namespace Chief\Resolvers; |
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use Chief\Command; |
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use Chief\CommandHandler; |
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use Chief\CommandHandlerResolver; |
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use Chief\Container; |
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use Chief\Exceptions\UnresolvableCommandHandlerException; |
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use Chief\Handlers\CallableCommandHandler; |
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use Chief\Handlers\LazyLoadingCommandHandler; |
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use Chief\Containers\NativeContainer; |
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class NativeCommandHandlerResolver implements CommandHandlerResolver |
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{ |
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protected $container; |
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protected $handlers = []; |
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public function __construct(Container $container = null) |
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{ |
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$this->container = $container ?: new NativeContainer; |
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} |
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/** |
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* Retrieve a CommandHandler for a given Command |
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* |
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* @param Command $command |
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* @return CommandHandler |
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* @throws UnresolvableCommandHandlerException |
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*/ |
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public function resolve(Command $command) |
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{ |
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$commandName = get_class($command); |
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// Find the CommandHandler if it has been manually defined using pushHandler() |
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foreach ($this->handlers as $handlerCommand => $handler) { |
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if ($handlerCommand == $commandName) { |
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return $handler; |
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} |
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} |
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// If the Command also implements CommandHandler, then it can handle() itself |
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if ($command instanceof CommandHandler) { |
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return $command; |
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} |
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// Try and guess the handler's name in the same namespace with suffix "Handler" |
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$class = $commandName . 'Handler'; |
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if (class_exists($class)) { |
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return $this->container->make($class); |
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} |
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// Try and guess the handler's name in nested "Handlers" namespace with suffix "Handler" |
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$classParts = explode('\\', $commandName); |
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$commandNameWithoutNamespace = array_pop($classParts); |
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$class = implode('\\', $classParts) . '\\Handlers\\' . $commandNameWithoutNamespace . 'Handler'; |
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if (class_exists($class)) { |
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return $this->container->make($class); |
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} |
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throw new UnresolvableCommandHandlerException('Could not resolve a handler for [' . get_class($command) . ']'); |
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} |
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/** |
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* Bind a handler to a command. These bindings should overrule the default |
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* resolution behaviour for this resolver |
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* |
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* @param string $commandName |
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* @param CommandHandler|callable|string $handler |
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* @return void |
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* @throws \InvalidArgumentException |
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*/ |
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public function bindHandler($commandName, $handler) |
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{ |
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// If the $handler given is an instance of CommandHandler, simply bind that |
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if ($handler instanceof CommandHandler) { |
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$this->handlers[$commandName] = $handler; |
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return; |
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} |
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// If the handler given is callable, wrap it up in a CallableCommandHandler for executing later |
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if (is_callable($handler)) { |
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return $this->bindHandler($commandName, new CallableCommandHandler($handler)); |
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} |
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// If the handler given is a string, wrap it up in a LazyLoadingCommandHandler for loading later |
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if (is_string($handler)) { |
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return $this->bindHandler($commandName, new LazyLoadingCommandHandler($handler, $this->container)); |
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} |
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throw new \InvalidArgumentException('Could not push handler. Command Handlers should be an |
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instance of Chief\CommandHandler, a callable, or a string representing a CommandHandler class'); |
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} |
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} |
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adamnicholson /
Chief
