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<?php |
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|
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declare(strict_types=1); |
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|
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namespace Yatra\Core; |
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|
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/** |
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* Simple Dependency Injection Container |
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*/ |
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class Container |
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{ |
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/** |
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* @var array |
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*/ |
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private array $bindings = []; |
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|
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/** |
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* @var array |
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*/ |
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private array $instances = []; |
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|
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/** |
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* Bind a class or closure to the container |
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*/ |
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public function bind(string $abstract, $concrete): void |
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{ |
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$this->bindings[$abstract] = $concrete; |
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} |
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|
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/** |
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* Bind a singleton instance |
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*/ |
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public function singleton(string $abstract, $concrete): void |
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{ |
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$this->bind($abstract, $concrete); |
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$this->instances[$abstract] = null; |
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} |
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|
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/** |
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* Resolve a class from the container |
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*/ |
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public function make(string $abstract) |
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{ |
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// Return if already resolved as singleton |
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if (isset($this->instances[$abstract]) && $this->instances[$abstract] !== null) { |
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return $this->instances[$abstract]; |
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} |
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|
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// Get concrete implementation |
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$concrete = $this->bindings[$abstract] ?? $abstract; |
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|
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// If concrete is a closure, call it |
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if (is_callable($concrete) && !is_string($concrete)) { |
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$instance = $concrete($this); |
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} else { |
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$instance = $this->build($concrete); |
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} |
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|
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// Store singleton instance |
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if (isset($this->instances[$abstract])) { |
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$this->instances[$abstract] = $instance; |
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} |
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|
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return $instance; |
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} |
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|
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/** |
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* Build an instance of a class |
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*/ |
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private function build(string $class) |
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{ |
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$reflection = new \ReflectionClass($class); |
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|
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if (!$reflection->isInstantiable()) { |
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throw new \Exception("Class {$class} is not instantiable"); |
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} |
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|
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$constructor = $reflection->getConstructor(); |
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|
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if ($constructor === null) { |
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return new $class(); |
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} |
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|
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$parameters = $constructor->getParameters(); |
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$dependencies = []; |
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|
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foreach ($parameters as $parameter) { |
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$type = $parameter->getType(); |
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|
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if ($type === null || $type->isBuiltin()) { |
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if ($parameter->isDefaultValueAvailable()) { |
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$dependencies[] = $parameter->getDefaultValue(); |
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} else { |
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throw new \Exception("Cannot resolve dependency {$parameter->getName()}"); |
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} |
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} else { |
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$dependency = $type->getName(); |
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$dependencies[] = $this->make($dependency); |
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} |
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} |
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|
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return $reflection->newInstanceArgs($dependencies); |
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} |
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|
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/** |
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* Check if abstract is bound |
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*/ |
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public function has(string $abstract): bool |
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{ |
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return isset($this->bindings[$abstract]); |
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} |
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|
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/** |
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* Get an instance (alias for make) |
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*/ |
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public function get(string $abstract) |
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{ |
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return $this->make($abstract); |
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} |
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} |
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|
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