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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2018 webtrees development team
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace Fisharebest\Webtrees;
use ReflectionClass;
use ReflectionMethod;
use ReflectionParameter;
/**
* Simple dependency injection.
*/
class Resolver
{
/** @var object[] */
private $bindings = [];
/**
* For some classes (e.g. Request, Tree, User), we inject a specific instance
* of an object, rather than a newly instantiated object
*
* @param string $class
* @param object $object
*
* @return void
*/
public function bind(string $class, $object)
{
$this->bindings[$class] = $object;
}
/**
* Create an instance of a class, injecting all its dependencies.
*
* @param string $class
*
* @return object
*/
public function resolve(string $class)
{
if (array_key_exists($class, $this->bindings)) {
return $this->bindings[$class];
}
$reflector = new ReflectionClass($class);
$constructor = $reflector->getConstructor();
// No constructor? Nothing to inject.
if ($constructor === null) {
return new $class();
}
$parameters = $this->resolveParameters($constructor->getParameters());
return $reflector->newInstanceArgs($parameters);
}
/**
* Call an object's method, injecting all its dependencies.
*
* @param object $object
* @param string $method
*
* @return mixed
*/
public function dispatch($object, string $method)
{
$reflector = new ReflectionMethod($object, $method);
$parameters = $this->resolveParameters($reflector->getParameters());
return $reflector->invoke($object, ...$parameters);
}
/**
* @param array $parameters
*
* @return array
*/
private function resolveParameters(array $parameters): array
{
return array_map(function (ReflectionParameter $parameter) {
return $this->resolve($parameter->getClass()->name);
}, $parameters);
}
}
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