Yiisoft\Di\Container

Complexity

Total Complexity

28

Size/Duplication

Total Lines	251
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes	7
Bugs	0	Features	0

14 Methods

Rating	Name	Duplication	Size	Complexity
A	get()	0	7	2
A	set()	0	5	1
A	addProviders()	0	4	2
A	has()	0	3	2
A	buildProvider()	0	8	1
A	delegateLookup()	0	10	3
A	processDefinition()	0	4	2
A	buildInternal()	0	9	2
A	setMultiple()	0	7	3
A	buildPrimitive()	0	9	2
A	addProvider()	0	10	3
A	__construct()	0	12	1
A	setDefaultDefinitions()	0	5	1
A	build()	0	18	3

<?php

declare(strict_types=1);

namespace Yiisoft\Di;

use Psr\Container\ContainerInterface;
use Yiisoft\Di\Contracts\DeferredServiceProviderInterface;
use Yiisoft\Di\Contracts\ServiceProviderInterface;
use Yiisoft\Factory\Definitions\ArrayDefinition;
use Yiisoft\Factory\Definitions\Normalizer;
use Yiisoft\Factory\Exceptions\CircularReferenceException;
use Yiisoft\Factory\Exceptions\InvalidConfigException;
use Yiisoft\Factory\Exceptions\NotFoundException;
use Yiisoft\Factory\Exceptions\NotInstantiableException;
use Yiisoft\Injector\Injector;

/**
 * Container implements a [dependency injection](http://en.wikipedia.org/wiki/Dependency_injection) container.
 */
final class Container extends AbstractContainerConfigurator implements ContainerInterface
{
    /**
     * @var array object definitions indexed by their types
     */
    private array $definitions = [];
    /**
     * @var array used to collect ids instantiated during build
     * to detect circular references
     */
    private array $building = [];

    /**
     * @var object[]
     */
    private array $instances = [];

    private ?CompositeContainer $rootContainer = null;

    /**
     * Container constructor.
     *
     * @param array $definitions Definitions to put into container.
     * @param ServiceProviderInterface[]|string[] $providers Service providers to get definitions from.
     *
     * @param ContainerInterface|null $rootContainer Root container to delegate lookup to in case definition
     * is not found in current container.
     * @throws InvalidConfigException
     */
    public function __construct(
        array $definitions = [],
        array $providers = [],
        ContainerInterface $rootContainer = null
    ) {
        $this->delegateLookup($rootContainer);
        $this->setDefaultDefinitions();
        $this->setMultiple($definitions);
        $this->addProviders($providers);

        # Prevent circular reference to ContainerInterface
        $this->get(ContainerInterface::class);
    }

    private function setDefaultDefinitions(): void
    {
        $this->definitions = [
            ContainerInterface::class => $this->rootContainer ?? $this,
            Injector::class => new Injector($this),
        ];
    }

    /**
     * Returns a value indicating whether the container has the definition of the specified name.
     * @param string $id class name, interface name or alias name
     * @return bool whether the container is able to provide instance of class specified.
     * @see set()
     */
    public function has($id): bool
    {
        return isset($this->definitions[$id]) || class_exists($id);
    }

    /**
     * Returns an instance by either interface name or alias.
     *
     * Same instance of the class will be returned each time this method is called.
     *
     * @param string $id The interface or an alias name that was previously registered.
     * @return object An instance of the requested interface.
     * @throws CircularReferenceException
     * @throws InvalidConfigException
     * @throws NotFoundException
     * @throws NotInstantiableException
     */
    public function get($id)
    {
        if (!isset($this->instances[$id])) {
            $this->instances[$id] = $this->build($id);
        }

        return $this->instances[$id];
    }

    /**
     * Delegate service lookup to another container.
     * @param ContainerInterface $container
     */
    protected function delegateLookup(?ContainerInterface $container): void
    {
        if ($container === null) {
            return;
        }
        if ($this->rootContainer === null) {
            $this->rootContainer = new CompositeContainer();
        }

        $this->rootContainer->attach($container);

The method attach() does not exist on null.

    }

    /**
     * Sets a definition to the container. Definition may be defined multiple ways.
     * @param string $id
     * @param mixed $definition
     * @throws InvalidConfigException
     * @see `Normalizer::normalize()`
     */
    protected function set(string $id, $definition): void
    {
        Normalizer::validate($definition);
        unset($this->instances[$id]);
        $this->definitions[$id] = $definition;
    }

    /**
     * Sets multiple definitions at once.
     * @param array $config definitions indexed by their ids
     * @throws InvalidConfigException
     */
    protected function setMultiple(array $config): void
    {
        foreach ($config as $id => $definition) {
            if (!is_string($id)) {
                throw new InvalidConfigException('Key must be a string');
            }
            $this->set($id, $definition);
        }
    }

    /**
     * Creates new instance by either interface name or alias.
     *
     * @param string $id The interface or an alias name that was previously registered.
     * @return object New built instance of the specified class.
     * @throws CircularReferenceException
     * @throws InvalidConfigException
     * @throws NotFoundException
     * @internal
     */
    private function build(string $id)
    {
        if (isset($this->building[$id])) {
            if ($id === ContainerInterface::class) {
                return $this;
            }
            throw new CircularReferenceException(sprintf(
                'Circular reference to "%s" detected while building: %s',
                $id,
                implode(',', array_keys($this->building))
            ));
        }

        $this->building[$id] = 1;
        $object = $this->buildInternal($id);
        unset($this->building[$id]);

        return $object;
    }

    /**
     * @param mixed $definition
     */
    private function processDefinition($definition): void
    {
        if ($definition instanceof DeferredServiceProviderInterface) {
            $definition->register($this);
        }
    }

    /**
     * @param string $id
     *
     * @return mixed|object
     * @throws InvalidConfigException
     * @throws NotFoundException
     */
    private function buildInternal(string $id)
    {
        if (!isset($this->definitions[$id])) {
            return $this->buildPrimitive($id);
        }
        $this->processDefinition($this->definitions[$id]);
        $definition = Normalizer::normalize($this->definitions[$id], $id);

        return $definition->resolve($this->rootContainer ?? $this);
    }

    /**
     * @param string $class
     *
     * @return mixed|object
     * @throws InvalidConfigException
     * @throws NotFoundException
     */
    private function buildPrimitive(string $class)
    {
        if (class_exists($class)) {
            $definition = new ArrayDefinition($class);

            return $definition->resolve($this->rootContainer ?? $this);
        }

        throw new NotFoundException("No definition for $class");
    }

    private function addProviders(array $providers): void
    {
        foreach ($providers as $provider) {
            $this->addProvider($provider);
        }
    }

    /**
     * Adds service provider to the container. Unless service provider is deferred
     * it would be immediately registered.
     *
     * @param mixed $providerDefinition
     *
     * @throws InvalidConfigException
     * @throws NotInstantiableException
     * @see ServiceProviderInterface
     * @see DeferredServiceProviderInterface
     */
    private function addProvider($providerDefinition): void
    {
        $provider = $this->buildProvider($providerDefinition);

        if ($provider instanceof DeferredServiceProviderInterface) {
            foreach ($provider->provides() as $id) {
                $this->definitions[$id] = $provider;
            }
        } else {
            $provider->register($this);
        }
    }

    /**
     * Builds service provider by definition.
     *
     * @param mixed $providerDefinition class name or definition of provider.
     * @return ServiceProviderInterface instance of service provider;
     *
     * @throws InvalidConfigException
     */
    private function buildProvider($providerDefinition): ServiceProviderInterface
    {
        $provider = Normalizer::normalize($providerDefinition)->resolve($this);
        assert($provider instanceof ServiceProviderInterface, new InvalidConfigException(
            'Service provider should be an instance of ' . ServiceProviderInterface::class
        ));

        return $provider;
    }
}