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File: Invoker.php
<?php namespace Invoker; use Invoker\Exception\NotCallableException; use Invoker\Exception\NotEnoughParametersException; use Invoker\ParameterResolver\AssociativeArrayResolver; use Invoker\ParameterResolver\DefaultValueResolver; use Invoker\ParameterResolver\NumericArrayResolver; use Invoker\ParameterResolver\ParameterResolver; use Invoker\ParameterResolver\ResolverChain; use Invoker\Reflection\CallableReflection; use Psr\Container\ContainerInterface; /** * Invoke a callable. * * @author Matthieu Napoli <matthieu@mnapoli.fr> */ class Invoker implements InvokerInterface { /** * @var CallableResolver|null */ private $callableResolver; /** * @var ParameterResolver */ private $parameterResolver; /** * @var ContainerInterface|null */ private $container; public function __construct(ParameterResolver $parameterResolver = null, ContainerInterface $container = null) { $this->parameterResolver = $parameterResolver ?: $this->createParameterResolver(); $this->container = $container; if ($container) { $this->callableResolver = new CallableResolver($container); } } /** * {@inheritdoc} */ public function call($callable, array $parameters = array()) { if ($this->callableResolver) { $callable = $this->callableResolver->resolve($callable); } if (! is_callable($callable)) { throw new NotCallableException(sprintf( '%s is not a callable', is_object($callable) ? 'Instance of ' . get_class($callable) : var_export($callable, true) )); } $callableReflection = CallableReflection::create($callable); $args = $this->parameterResolver->getParameters($callableReflection, $parameters, array()); // Sort by array key because call_user_func_array ignores numeric keys ksort($args); // Check all parameters are resolved $diff = array_diff_key($callableReflection->getParameters(), $args); if (! empty($diff)) { /** @var \ReflectionParameter $parameter */ $parameter = reset($diff); throw new NotEnoughParametersException(sprintf( 'Unable to invoke the callable because no value was given for parameter %d ($%s)', $parameter->getPosition() + 1, $parameter->name )); } return call_user_func_array($callable, $args); } /** * Create the default parameter resolver. * * @return ParameterResolver */ private function createParameterResolver() { return new ResolverChain(array( new NumericArrayResolver, new AssociativeArrayResolver, new DefaultValueResolver, )); } /** * @return ParameterResolver By default it's a ResolverChain */ public function getParameterResolver() { return $this->parameterResolver; } /** * @return ContainerInterface|null */ public function getContainer() { return $this->container; } /** * @return CallableResolver|null Returns null if no container was given in the constructor. */ public function getCallableResolver() { return $this->callableResolver; } }