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<?php |
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namespace HexMakina\LeMarchand; |
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use Psr\Container\ContainerInterface; |
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class Factory |
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{ |
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// store cached instances |
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private static $instance_cache = []; |
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// Private container used for dependency injection |
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private $container = null; |
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// Constructor accepting Container Interface |
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public function __construct(ContainerInterface $container) |
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{ |
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// Assign given container instance to member variable |
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$this->container = $container; |
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} |
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// Function accepting class name and contruction args for builder methods |
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public function serve($class, $construction_args = null) |
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{ |
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// Look for cached instance, otherwise try to build new instance |
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return $this->stock($class) |
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?? $this->build($class, $construction_args) |
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?? null; |
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} |
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// Function to store cache instances. Also accepts single instance |
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public function stock($class, $instance = null) |
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{ |
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// If an instance was passed in, store it |
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if (!is_null($instance)) { |
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self::$instance_cache[$class] = $instance; |
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} |
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// Return the instance found in the cache or null if not found |
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return self::$instance_cache[$class] ?? null; |
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} |
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// Function to build new Instances from classes |
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public function build($class, $construction_args = null) |
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{ |
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try { |
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// Create ReflectionClass based on given class |
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$reflection = new \ReflectionClass($class); |
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// Get constructor from ReflectionClass |
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$constructor = $reflection->getConstructor(); |
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$instance = null; |
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// Create instance depending on existence of constructor |
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if (is_null($constructor)) { |
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$instance = $reflection->newInstanceArgs(); |
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} else { |
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// Check if construction args are empty, |
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// if so get them from constructor |
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if (empty($construction_args)) { |
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$construction_args = $this->getConstructorParameters($constructor); |
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} |
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// Determine how to build instance based on visibility of constructor |
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$instance = $constructor->isPrivate() |
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? $this->buildSingleton($reflection, $construction_args) |
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: $reflection->newInstanceArgs($construction_args); |
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} |
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// Cache instance for later use |
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$this->stock($class, $instance); |
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// Return Created Instance |
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return $instance; |
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} catch (\ReflectionException $e) { |
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// Throw an exception based on the ReflectionException message |
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throw new ContainerException($e->getMessage()); |
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} |
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} |
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// Function to get Constructor Parameters from given constructor |
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private function getConstructorParameters(\ReflectionMethod $constructor) |
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{ |
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// Init return array |
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$ret = []; |
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foreach ($constructor->getParameters() as $param) { |
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// Get parameter type, if exists |
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$id = $param->getType() |
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? $param->getType()->getName() |
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: 'settings.Constructor.' . $constructor->class . '.' . $param->getName(); |
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// Get resource with Id and append to return array |
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$ret [] = $this->container->get($id); |
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} |
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// Return array with constructed objects |
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return $ret; |
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} |
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// Function to build singletons |
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private function buildSingleton(\ReflectionClass $rc, $construction_args) |
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{ |
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// Get first argument as instantiation method |
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$singleton_method = $rc->getMethod(array_shift($construction_args)); |
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// Get second argument as invocation args |
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$construction_args = array_shift($construction_args); |
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// Invoke method with arguments |
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$singleton = $singleton_method->invoke(null, $construction_args); |
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// Return singletion |
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return $singleton; |
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} |
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} |
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HexMakina /
LeMarchand
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