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<?php |
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/** |
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* Phossa Project |
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* |
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* PHP version 5.4 |
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* |
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* @category Library |
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* @package Phossa2\Di |
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* @copyright Copyright (c) 2016 phossa.com |
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* @license http://mit-license.org/ MIT License |
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* @link http://www.phossa.com/ |
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*/ |
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/*# declare(strict_types=1); */ |
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namespace Phossa2\Di\Factory; |
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use Phossa2\Di\Exception\LogicException; |
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/** |
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* FactoryHelperTrait |
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* |
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* Create service instance here |
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* |
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* @package Phossa2\Di |
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* @author Hong Zhang <[email protected]> |
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* @version 2.0.0 |
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* @since 2.0.0 added |
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*/ |
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trait FactoryHelperTrait |
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{ |
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/** |
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* Instantiate service object from classname |
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* |
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* @param string $class |
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* @param array $args |
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* @return object |
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* @throws LogicException if something goes wrong |
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* @access protected |
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*/ |
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protected function constructObject(/*# string */ $class, array $args) |
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{ |
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$reflector = new \ReflectionClass($class); |
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$constructor = $reflector->getConstructor(); |
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// not constructor defined |
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if (is_null($constructor)) { |
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$obj = $reflector->newInstanceWithoutConstructor(); |
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// normal class with constructor |
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} else { |
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$args = $this->matchArguments($constructor->getParameters(), $args); |
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$obj = $reflector->newInstanceArgs($args); |
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} |
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return $obj; |
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} |
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/** |
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* Match provided arguments with a method/function's reflection parameters |
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* |
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* @param \ReflectionParameter[] $reflectionParameters |
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* @param array $providedArguments |
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* @return array the resolved arguments |
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* @throws LogicException |
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* @access protected |
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*/ |
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protected function matchArguments( |
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array $reflectionParameters, |
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array $providedArguments |
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)/*# : array */ { |
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// result |
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$resolvedArguments = []; |
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foreach ($reflectionParameters as $i => $param) { |
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$class = $param->getClass(); |
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if ($this->isTypeMatched($class, $providedArguments)) { |
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$resolvedArguments[$i] = array_shift($providedArguments); |
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} elseif ($this->isRequiredClass($param, $providedArguments)) { |
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$resolvedArguments[$i] = $this->getObjectByClass($class->getName()); |
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} |
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} |
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return array_merge($resolvedArguments, $providedArguments); |
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} |
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/** |
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* Try best to guess parameter and argument are the same type |
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* |
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* @param null|\ReflectionClass $class |
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* @param array $arguments |
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* @return bool |
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* @access protected |
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*/ |
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protected function isTypeMatched($class, array $arguments)/*# : bool */ |
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{ |
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if (empty($arguments)) { |
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return false; |
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} elseif (null !== $class) { |
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return is_a($arguments[0], $class->getName()); |
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} else { |
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return true; |
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} |
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} |
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/** |
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* Is $param required and is a class/interface |
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* |
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* @param \ReflectionParameter $param |
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* @param array $arguments |
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* @return bool |
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* @throws LogicException if mismatched arguments |
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* @access protected |
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*/ |
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protected function isRequiredClass( |
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\ReflectionParameter $param, |
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array $arguments |
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)/*# : bool */ { |
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$optional = $param->isOptional(); |
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if ($param->getClass()) { |
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return !$optional || !empty($arguments); |
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} else { |
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return false; |
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} |
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} |
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/** |
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* Get callable parameters |
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* |
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* @param callable $callable |
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* @return \ReflectionParameter[] |
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* @throws LogicException if something goes wrong |
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* @access protected |
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*/ |
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protected function getCallableParameters(callable $callable)/*# : array */ |
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{ |
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// array type |
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if (is_array($callable)) { |
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$reflector = new \ReflectionClass($callable[0]); |
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$method = $reflector->getMethod($callable[1]); |
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// object with __invoke() defined |
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} elseif ($this->isInvocable($callable)) { |
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$reflector = new \ReflectionClass($callable); |
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$method = $reflector->getMethod('__invoke'); |
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// simple function |
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} else { |
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$method = new \ReflectionFunction($callable); |
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} |
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return $method->getParameters(); |
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} |
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/** |
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* Is $var a non-closure object with '__invoke()' defined ? |
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* |
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* @param mixed $var |
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* @return bool |
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* @access protected |
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*/ |
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protected function isInvocable($var)/*# : bool */ |
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{ |
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return is_object($var) && |
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!$var instanceof \Closure && |
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method_exists($var, '__invoke'); |
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} |
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} |
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phossa2 /
di
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.