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<?php namespace Illuminate\Container;
use Closure; use ArrayAccess; use ReflectionClass; use ReflectionParameter;
class BindingResolutionException extends \Exception {}
class Container implements ArrayAccess {
/** * An array of the types that have been resolved. * * @var array */ protected $resolved = array();
/** * The container's bindings. * * @var array */ protected $bindings = array();
/** * The container's shared instances. * * @var array */ protected $instances = array();
/** * The registered type aliases. * * @var array */ protected $aliases = array();
/** * All of the registered rebound callbacks. * * @var array */ protected $reboundCallbacks = array();
/** * All of the registered resolving callbacks. * * @var array */ protected $resolvingCallbacks = array();
/** * All of the global resolving callbacks. * * @var array */ protected $globalResolvingCallbacks = array();
/** * Determine if a given string is resolvable. * * @param string $abstract * @return bool */ protected function resolvable($abstract) { return $this->bound($abstract) || $this->isAlias($abstract); }
/** * Determine if the given abstract type has been bound. * * @param string $abstract * @return bool */ public function bound($abstract) { return isset($this[$abstract]) || isset($this->instances[$abstract]); }
/** * Determine if a given string is an alias. * * @param string $name * @return bool */ public function isAlias($name) { return isset($this->aliases[$name]); }
/** * Register a binding with the container. * * @param string $abstract * @param Closure|string|null $concrete * @param bool $shared * @return void */ public function bind($abstract, $concrete = null, $shared = false) { // If the given types are actually an array, we will assume an alias is being // defined and will grab this "real" abstract class name and register this // alias with the container so that it can be used as a shortcut for it. if (is_array($abstract)) { list($abstract, $alias) = $this->extractAlias($abstract);
$this->alias($abstract, $alias); }
// If no concrete type was given, we will simply set the concrete type to the // abstract type. This will allow concrete type to be registered as shared // without being forced to state their classes in both of the parameter. $this->dropStaleInstances($abstract);
if (is_null($concrete)) { $concrete = $abstract; }
// If the factory is not a Closure, it means it is just a class name which is // is bound into this container to the abstract type and we will just wrap // it up inside a Closure to make things more convenient when extending. if ( ! $concrete instanceof Closure) { $concrete = $this->getClosure($abstract, $concrete); }
$bound = $this->bound($abstract);
$this->bindings[$abstract] = compact('concrete', 'shared');
// If the abstract type was already bound in this container, we will fire the // rebound listener so that any objects which have already gotten resolved // can have their copy of the object updated via the listener callbacks. if ($bound) { $this->rebound($abstract); } }
/** * Get the Closure to be used when building a type. * * @param string $abstract * @param string $concrete * @return \Closure */ protected function getClosure($abstract, $concrete) { return function($c, $parameters = array()) use ($abstract, $concrete) { $method = ($abstract == $concrete) ? 'build' : 'make';
return $c->$method($concrete, $parameters); }; }
/** * Register a binding if it hasn't already been registered. * * @param string $abstract * @param Closure|string|null $concrete * @param bool $shared * @return void */ public function bindIf($abstract, $concrete = null, $shared = false) { if ( ! $this->bound($abstract)) { $this->bind($abstract, $concrete, $shared); } }
/** * Register a shared binding in the container. * * @param string $abstract * @param Closure|string|null $concrete * @return void */ public function singleton($abstract, $concrete = null) { return $this->bind($abstract, $concrete, true); }
/** * Wrap a Closure such that it is shared. * * @param Closure $closure * @return Closure */ public function share(Closure $closure) { return function($container) use ($closure) { // We'll simply declare a static variable within the Closures and if it has // not been set we will execute the given Closures to resolve this value // and return it back to these consumers of the method as an instance. static $object;
if (is_null($object)) { $object = $closure($container); }
return $object; }; }
/** * Bind a shared Closure into the container. * * @param string $abstract * @param \Closure $closure * @return void */ public function bindShared($abstract, Closure $closure) { return $this->bind($abstract, $this->share($closure), true); }
/** * "Extend" an abstract type in the container. * * @param string $abstract * @param Closure $closure * @return void * * @throws \InvalidArgumentException */ public function extend($abstract, Closure $closure) { if ( ! isset($this->bindings[$abstract])) { throw new \InvalidArgumentException("Type {$abstract} is not bound."); }
if (isset($this->instances[$abstract])) { $this->instances[$abstract] = $closure($this->instances[$abstract], $this);
$this->rebound($abstract); } else { $extender = $this->getExtender($abstract, $closure);
$this->bind($abstract, $extender, $this->isShared($abstract)); } }
/** * Get an extender Closure for resolving a type. * * @param string $abstract * @param \Closure $closure * @return \Closure */ protected function getExtender($abstract, Closure $closure) { // To "extend" a binding, we will grab the old "resolver" Closure and pass it // into a new one. The old resolver will be called first and the result is // handed off to the "new" resolver, along with this container instance. $resolver = $this->bindings[$abstract]['concrete'];
return function($container) use ($resolver, $closure) { return $closure($resolver($container), $container); }; }
/** * Register an existing instance as shared in the container. * * @param string $abstract * @param mixed $instance * @return void */ public function instance($abstract, $instance) { // First, we will extract the alias from the abstract if it is an array so we // are using the correct name when binding the type. If we get an alias it // will be registered with the container so we can resolve it out later. if (is_array($abstract)) { list($abstract, $alias) = $this->extractAlias($abstract);
$this->alias($abstract, $alias); }
unset($this->aliases[$abstract]);
// We'll check to determine if this type has been bound before, and if it has // we will fire the rebound callbacks registered with the container and it // can be updated with consuming classes that have gotten resolved here. $bound = $this->bound($abstract);
$this->instances[$abstract] = $instance;
if ($bound) { $this->rebound($abstract); } }
/** * Alias a type to a shorter name. * * @param string $abstract * @param string $alias * @return void */ public function alias($abstract, $alias) { $this->aliases[$alias] = $abstract; }
/** * Extract the type and alias from a given definition. * * @param array $definition * @return array */ protected function extractAlias(array $definition) { return array(key($definition), current($definition)); }
/** * Bind a new callback to an abstract's rebind event. * * @param string $abstract * @param \Closure $callback * @return mixed */ public function rebinding($abstract, Closure $callback) { $this->reboundCallbacks[$abstract][] = $callback;
if ($this->bound($abstract)) return $this->make($abstract); }
/** * Refresh an instance on the given target and method. * * @param string $abstract * @param mixed $target * @param string $method * @return mixed */ public function refresh($abstract, $target, $method) { return $this->rebinding($abstract, function($app, $instance) use ($target, $method) { $target->{$method}($instance); }); }
/** * Fire the "rebound" callbacks for the given abstract type. * * @param string $abstract * @return void */ protected function rebound($abstract) { $instance = $this->make($abstract);
foreach ($this->getReboundCallbacks($abstract) as $callback) { call_user_func($callback, $this, $instance); } }
/** * Get the rebound callbacks for a given type. * * @param string $abstract * @return array */ protected function getReboundCallbacks($abstract) { if (isset($this->reboundCallbacks[$abstract])) { return $this->reboundCallbacks[$abstract]; } else { return array(); } }
/** * Resolve the given type from the container. * * @param string $abstract * @param array $parameters * @return mixed */ public function make($abstract, $parameters = array()) { $abstract = $this->getAlias($abstract);
$this->resolved[$abstract] = true;
// If an instance of the type is currently being managed as a singleton we'll // just return an existing instance instead of instantiating new instances // so the developer can keep using the same objects instance every time. if (isset($this->instances[$abstract])) { return $this->instances[$abstract]; }
$concrete = $this->getConcrete($abstract);
// We're ready to instantiate an instance of the concrete type registered for // the binding. This will instantiate the types, as well as resolve any of // its "nested" dependencies recursively until all have gotten resolved. if ($this->isBuildable($concrete, $abstract)) { $object = $this->build($concrete, $parameters); } else { $object = $this->make($concrete, $parameters); }
// If the requested type is registered as a singleton we'll want to cache off // the instances in "memory" so we can return it later without creating an // entirely new instance of an object on each subsequent request for it. if ($this->isShared($abstract)) { $this->instances[$abstract] = $object; }
$this->fireResolvingCallbacks($abstract, $object);
return $object; }
/** * Get the concrete type for a given abstract. * * @param string $abstract * @return mixed $concrete */ protected function getConcrete($abstract) { // If we don't have a registered resolver or concrete for the type, we'll just // assume each type is a concrete name and will attempt to resolve it as is // since the container should be able to resolve concretes automatically. if ( ! isset($this->bindings[$abstract])) { if ($this->missingLeadingSlash($abstract) && isset($this->bindings['\\'.$abstract])) { $abstract = '\\'.$abstract; }
return $abstract; } else { return $this->bindings[$abstract]['concrete']; } }
/** * Determine if the given abstract has a leading slash. * * @param string $abstract * @return bool */ protected function missingLeadingSlash($abstract) { return is_string($abstract) && strpos($abstract, '\\') !== 0; }
/** * Instantiate a concrete instance of the given type. * * @param string $concrete * @param array $parameters * @return mixed * * @throws BindingResolutionException */ public function build($concrete, $parameters = array()) { // If the concrete type is actually a Closure, we will just execute it and // hand back the results of the functions, which allows functions to be // used as resolvers for more fine-tuned resolution of these objects. if ($concrete instanceof Closure) { return $concrete($this, $parameters); }
$reflector = new ReflectionClass($concrete);
// If the type is not instantiable, the developer is attempting to resolve // an abstract type such as an Interface of Abstract Class and there is // no binding registered for the abstractions so we need to bail out. if ( ! $reflector->isInstantiable()) { $message = "Target [$concrete] is not instantiable.";
throw new BindingResolutionException($message); }
$constructor = $reflector->getConstructor();
// If there are no constructors, that means there are no dependencies then // we can just resolve the instances of the objects right away, without // resolving any other types or dependencies out of these containers. if (is_null($constructor)) { return new $concrete; }
$dependencies = $constructor->getParameters();
// Once we have all the constructor's parameters we can create each of the // dependency instances and then use the reflection instances to make a // new instance of this class, injecting the created dependencies in. $parameters = $this->keyParametersByArgument( $dependencies, $parameters );
$instances = $this->getDependencies( $dependencies, $parameters );
return $reflector->newInstanceArgs($instances); }
/** * Resolve all of the dependencies from the ReflectionParameters. * * @param array $parameters * @param array $primitives * @return array */ protected function getDependencies($parameters, array $primitives = array()) { $dependencies = array();
foreach ($parameters as $parameter) { $dependency = $parameter->getClass();
// If the class is null, it means the dependency is a string or some other // primitive type which we can not resolve since it is not a class and // we will just bomb out with an error since we have no-where to go. if (array_key_exists($parameter->name, $primitives)) { $dependencies[] = $primitives[$parameter->name]; } elseif (is_null($dependency)) { $dependencies[] = $this->resolveNonClass($parameter); } else { $dependencies[] = $this->resolveClass($parameter); } }
return (array) $dependencies; }
/** * Resolve a non-class hinted dependency. * * @param ReflectionParameter $parameter * @return mixed * * @throws BindingResolutionException */ protected function resolveNonClass(ReflectionParameter $parameter) { if ($parameter->isDefaultValueAvailable()) { return $parameter->getDefaultValue(); } else { $message = "Unresolvable dependency resolving [$parameter].";
throw new BindingResolutionException($message); } }
/** * Resolve a class based dependency from the container. * * @param \ReflectionParameter $parameter * @return mixed * * @throws BindingResolutionException */ protected function resolveClass(ReflectionParameter $parameter) { try { return $this->make($parameter->getClass()->name); }
// If we can not resolve the class instance, we will check to see if the value // is optional, and if it is we will return the optional parameter value as // the value of the dependency, similarly to how we do this with scalars. catch (BindingResolutionException $e) { if ($parameter->isOptional()) { return $parameter->getDefaultValue(); } else { throw $e; } } }
/** * If extra parameters are passed by numeric ID, rekey them by argument name. * * @param array $dependencies * @param array $parameters * @param array * @return array */ protected function keyParametersByArgument(array $dependencies, array $parameters) { foreach ($parameters as $key => $value) { if (is_numeric($key)) { unset($parameters[$key]);
$parameters[$dependencies[$key]->name] = $value; } }
return $parameters; }
/** * Register a new resolving callback. * * @param string $abstract * @param \Closure $callback * @return void */ public function resolving($abstract, Closure $callback) { $this->resolvingCallbacks[$abstract][] = $callback; }
/** * Register a new resolving callback for all types. * * @param \Closure $callback * @return void */ public function resolvingAny(Closure $callback) { $this->globalResolvingCallbacks[] = $callback; }
/** * Fire all of the resolving callbacks. * * @param mixed $object * @return void */ protected function fireResolvingCallbacks($abstract, $object) { if (isset($this->resolvingCallbacks[$abstract])) { $this->fireCallbackArray($object, $this->resolvingCallbacks[$abstract]); }
$this->fireCallbackArray($object, $this->globalResolvingCallbacks); }
/** * Fire an array of callbacks with an object. * * @param mixed $object * @param array $callbacks */ protected function fireCallbackArray($object, array $callbacks) { foreach ($callbacks as $callback) { call_user_func($callback, $object, $this); } }
/** * Determine if a given type is shared. * * @param string $abstract * @return bool */ public function isShared($abstract) { if (isset($this->bindings[$abstract]['shared'])) { $shared = $this->bindings[$abstract]['shared']; } else { $shared = false; }
return isset($this->instances[$abstract]) || $shared === true; }
/** * Determine if the given concrete is buildable. * * @param mixed $concrete * @param string $abstract * @return bool */ protected function isBuildable($concrete, $abstract) { return $concrete === $abstract || $concrete instanceof Closure; }
/** * Get the alias for an abstract if available. * * @param string $abstract * @return string */ protected function getAlias($abstract) { return isset($this->aliases[$abstract]) ? $this->aliases[$abstract] : $abstract; }
/** * Get the container's bindings. * * @return array */ public function getBindings() { return $this->bindings; }
/** * Drop all of the stale instances and aliases. * * @param string $abstract * @return void */ protected function dropStaleInstances($abstract) { unset($this->instances[$abstract]);
unset($this->aliases[$abstract]); }
/** * Remove a resolved instance from the instance cache. * * @param string $abstract * @return void */ public function forgetInstance($abstract) { unset($this->instances[$abstract]); }
/** * Clear all of the instances from the container. * * @return void */ public function forgetInstances() { $this->instances = array(); }
/** * Determine if a given offset exists. * * @param string $key * @return bool */ public function offsetExists($key) { return isset($this->bindings[$key]); }
/** * Get the value at a given offset. * * @param string $key * @return mixed */ public function offsetGet($key) { return $this->make($key); }
/** * Set the value at a given offset. * * @param string $key * @param mixed $value * @return void */ public function offsetSet($key, $value) { // If the value is not a Closure, we will make it one. This simply gives // more "drop-in" replacement functionality for the Pimple which this // container's simplest functions are base modeled and built after. if ( ! $value instanceof Closure) { $value = function() use ($value) { return $value; }; }
$this->bind($key, $value); }
/** * Unset the value at a given offset. * * @param string $key * @return void */ public function offsetUnset($key) { unset($this->bindings[$key]);
unset($this->instances[$key]); }
}
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