/**
* Resolve a non-class hinted dependency.
*
* @param \ReflectionParameter $parameter
* @return mixed
*
* @throws \Illuminate\Contracts\Container\BindingResolutionException
*/
protected function resolveNonClass(ReflectionParameter $parameter)
{// the parameter is a RefectionParameter $parameter
if (! is_null($concrete = $this->getContextualConcrete(‘$‘.$parameter->name))) {
// if can get the concrete
if ($concrete instanceof Closure) {// if the concrete is a instance of Closure
return call_user_func($concrete, $this);// return the call_user_func
} else {
return $concrete;// return concrete
}
}
if ($parameter->isDefaultValueAvailable()) {// if has
return $parameter->getDefaultValue();// return it
}
// other ,set the bad message and return it
// some time the message is very good use double " ,yeah
$message = "Unresolvable dependency resolving [$parameter] in class {$parameter->getDeclaringClass()->getName()}";
throw new BindingResolutionException($message);// throw bad message
}
/**
* Resolve a class based dependency from the container.
*
* @param \ReflectionParameter $parameter
* @return mixed
*
* @throws \Illuminate\Contracts\Container\BindingResolutionException
*/
protected function resolveClass(ReflectionParameter $parameter)
{// the class is based dependency from the container.
try {
return $this->make($parameter->getClass()->name);
}// try check this class name whether can be make
// 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 $e) {// catch the exception
if ($parameter->isOptional()) {// if we has the Optional
return $parameter->getDefaultValue();
}
throw $e;// throw $e
}
}本文出自 “专注php” 博客，请务必保留此出处http://jingshanls.blog.51cto.com/3357095/1783327
每天laravel-20160815| Container -18
原文：http://jingshanls.blog.51cto.com/3357095/1783327