Injector.php

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<?php

namespace ILIAS\BackgroundTasks\Dependencies;

use ILIAS\BackgroundTasks\Dependencies\DependencyMap\DependencyMap;
use ILIAS\BackgroundTasks\Dependencies\Exceptions\InvalidClassException;
use ILIAS\DI\Container;
use ReflectionParameter;

class Injector
{
    public function __construct(protected Container $dic, protected DependencyMap $dependencyMap)
    {
    }

    public function createInstance(
        string $fullyQualifiedClassName,
        bool $requireFile = false,
        ?callable $with = null
    ): object {
        // The reflection classes needed.
        $reflectionClass = new \ReflectionClass($fullyQualifiedClassName);
        $constructor = $reflectionClass->getConstructor();
        if ($constructor === null) {
            return $reflectionClass->newInstance();
        }

        $parameters = $constructor->getParameters();

        // we get the arguments to construct the object from the DIC and Typehinting.
        $constructorArguments = $this->createConstructorArguments($fullyQualifiedClassName, $parameters, $with);

        // Crate the instance with the arguments.
        return $reflectionClass->newInstanceArgs($constructorArguments);
    }

    protected function createConstructorArguments(
        string $fullyQualifiedClassName,
        array $parameters,
        ?callable $with
    ): array {
        $constructorArguments = [];

        foreach ($parameters as $parameter) {
            // As long as there are given arguments we take those.
            $constructorArguments[] = $this->getDependency($fullyQualifiedClassName, $parameter, $with);
        }

        return $constructorArguments;
    }

    protected function getDependency(
        string $fullyQualifiedClassName,
        ReflectionParameter $parameter,
        ?callable $with = null
    ) {
        // These Lines are currently commented while we cant use $parameter->getType() which will be part of PHP7
        //              if (!$parameter->getType()) {
        //                      throw new InvalidClassException("The constructor of $fullyQualifiedClassName is not fully type hinted, or the type hints cannot be resolved.");
        //              }

        //              $type = $parameter->getType()->__toString();
        $type = $parameter->getClass()->getName();

        //              if ($parameter->getType()->isBuiltin()) {
        //                      throw new InvalidClassException("The DI cannot instantiate $fullyQualifiedClassName because some of the constructors arguments are built in types. Only interfaces (and objects) are stored in the DI-Container.");
        //              }

        if (!$type) {
            throw new InvalidClassException("The DI cannot instantiate $fullyQualifiedClassName because some of the constructors arguments are not type hinted. Make sure all parameters in the constructor have type hinting.");
        }

        if ($with) {
            return $this->dependencyMap->getDependencyWith($this->dic, $type, $fullyQualifiedClassName, $with);
        }
        return $this->dependencyMap->getDependency($this->dic, $type, $fullyQualifiedClassName);
    }
}