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<?php |
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/* |
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* This file is part of the slince/di package. |
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* |
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* (c) Slince <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Slince\Di; |
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use Slince\Di\Exception\ConfigException; |
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use Slince\Di\Exception\DependencyInjectionException; |
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use Slince\Di\Exception\NotFoundException; |
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class Resolver |
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{ |
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/** |
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* @var Container |
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*/ |
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protected $container; |
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/** |
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* @param Container $container |
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*/ |
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public function __construct(Container $container) |
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{ |
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$this->container = $container; |
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} |
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/** |
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* @param Definition $definition |
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* |
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* @return mixed |
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*/ |
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public function resolve(Definition $definition) |
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{ |
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$this->parseConcrete($definition); |
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if (null !== $definition->getFactory()) { |
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$instance = $this->createFromFactory($definition); |
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} elseif (null !== $definition->getClass()) { |
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$instance = $this->createFromClass($definition); |
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} elseif (null !== $definition->getResolved()) { |
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$instance = $definition->getResolved(); |
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} else { |
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throw new ConfigException('The definition is not invalid.'); |
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} |
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$this->invokeMethods($definition, $instance); |
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$this->invokeProperties($definition, $instance); |
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$definition->setResolved($instance); |
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return $instance; |
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} |
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protected function parseConcrete(Definition $definition) |
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{ |
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$concrete = $definition->getConcrete(); |
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if (is_string($concrete)) { |
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$definition->setClass($concrete); |
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} elseif (is_array($concrete) || $concrete instanceof \Closure) { |
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$definition->setFactory($concrete); |
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} elseif (is_object($concrete)) { |
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$definition->setResolved($concrete) |
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->setShared(true); |
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} else { |
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throw new ConfigException('The concrete of the definition is invalid'); |
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} |
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} |
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protected function createFromClass(Definition $definition) |
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{ |
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$class = $definition->getClass(); |
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try { |
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$reflection = new \ReflectionClass($definition->getClass()); |
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} catch (\ReflectionException $e) { |
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throw new DependencyInjectionException(sprintf('Class "%s" is invalid', $definition->getClass())); |
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} |
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if (!$reflection->isInstantiable()) { |
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throw new DependencyInjectionException(sprintf('Can not instantiate "%s"', $definition->getClass())); |
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} |
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$constructor = $reflection->getConstructor(); |
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if (is_null($constructor)) { |
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$instance = $reflection->newInstanceWithoutConstructor(); |
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} else { |
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$arguments = $this->resolveArguments($definition->getArguments()); |
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if ($definition->isAutowired()) { |
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$arguments = $this->resolveDependencies($constructor->getParameters(), $arguments); |
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} |
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if (count($arguments) < $constructor->getNumberOfRequiredParameters()) { |
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throw new ConfigException(sprintf('Too few arguments for class "%s"', $class)); |
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} |
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$instance = $reflection->newInstanceArgs($arguments); |
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} |
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return $instance; |
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} |
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/** |
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* @param Definition $definition |
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* |
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* @return object |
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*/ |
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protected function createFromFactory(Definition $definition) |
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{ |
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$factory = $definition->getFactory(); |
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if (is_array($factory)) { |
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$factory = $this->resolveArguments($factory); |
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} |
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return call_user_func_array($factory, |
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$this->resolveArguments($definition->getArguments()) ?: [$this->container] |
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); |
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} |
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/** |
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* @param Definition $definition |
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* @param object $instance |
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*/ |
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protected function invokeMethods(Definition $definition, $instance) |
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{ |
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foreach ($definition->getMethodCalls() as $method) { |
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call_user_func_array([$instance, $method[0]], $this->resolveArguments($method[1])); |
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} |
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} |
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/** |
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* @param Definition $definition |
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* @param object $instance |
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*/ |
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protected function invokeProperties(Definition $definition, $instance) |
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{ |
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$properties = $this->resolveArguments($definition->getProperties()); |
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foreach ($properties as $name => $value) { |
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$instance->$name = $value; |
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} |
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} |
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/** |
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* Resolve dependencies. |
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* |
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* @param \ReflectionParameter[] $dependencies |
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* @param array $arguments |
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* @return array |
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* @throws DependencyInjectionException |
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*/ |
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protected function resolveDependencies($dependencies, $arguments) |
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{ |
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$solved = []; |
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foreach ($dependencies as $dependency) { |
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if (isset($arguments[$dependency->getPosition()])) { |
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$solved[] = $arguments[$dependency->getPosition()]; |
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continue; |
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} |
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if (null !== $dependency->getClass()) { |
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$solved[] = $this->container->get($dependency->getClass()->name); |
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continue; |
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} |
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if ($dependency->isOptional()) { |
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$solved[] = $dependency->getDefaultValue(); |
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continue; |
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} |
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throw new DependencyInjectionException(sprintf( |
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'Unresolvable dependency resolving "%s" in class "%s"', |
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$dependency->name, |
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$dependency->getDeclaringClass()->getName() |
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)); |
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} |
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return $solved; |
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} |
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/** |
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* Resolves array of parameters. |
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* |
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* @param array $arguments |
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* |
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* @return array |
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*/ |
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protected function resolveArguments($arguments) |
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{ |
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foreach ($arguments as &$argument) { |
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if ($argument instanceof Reference) { |
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$argument = $this->container->get($argument->getId()); |
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continue; |
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} |
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} |
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return $arguments; |
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} |
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} |
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