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<?php |
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namespace Finalizer\Constraint; |
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final class IsFinalizable |
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{ |
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/** |
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* @param \ReflectionClass $class |
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* @param \ReflectionClass ...$definedClasses |
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* |
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* @return bool |
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*/ |
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public function __invoke(\ReflectionClass $class, \ReflectionClass ...$definedClasses) |
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{ |
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return ! $class->isAbstract() |
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&& ! $this->hasChildClasses($class, $definedClasses) |
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&& ( |
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($class->getInterfaces() && $this->implementsOnlyInterfaceMethods($class)) |
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|| $this->isOnlyInvokable($class) |
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); |
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} |
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/** |
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* Checks whether a given class is an invokable, and whether no other methods are implemented on it |
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* |
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* @param \ReflectionClass $class |
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* |
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* @return bool |
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*/ |
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private function isOnlyInvokable(\ReflectionClass $class) |
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{ |
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return ['__invoke'] === array_values(array_map('strtolower', $this->getNonConstructorMethodNames($class))) |
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&& ! $class->getMethod('__invoke')->isStatic(); |
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} |
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/** |
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* @param \ReflectionClass $class |
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* @param \ReflectionClass[] $definedClasses |
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* |
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* @return bool |
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*/ |
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private function hasChildClasses(\ReflectionClass $class, array $definedClasses) |
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{ |
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return array_filter( |
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$definedClasses, |
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function (\ReflectionClass $childClassCandidate) use ($class) { |
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$parentClass = $childClassCandidate->getParentClass(); |
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if (! $parentClass) { |
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return false; |
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} |
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return $parentClass->getName() === $class->getName(); |
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} |
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); |
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} |
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/** |
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* Checks whether all methods implemented by $class are defined in |
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* interfaces implemented by $class |
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* |
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* @param \ReflectionClass $class |
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* |
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* @return bool |
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*/ |
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private function implementsOnlyInterfaceMethods(\ReflectionClass $class) |
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{ |
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return ! array_diff( |
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$this->getNonConstructorMethodNames($class), |
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array_merge( |
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[], |
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[], |
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...array_values(array_map( |
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[$this, 'getNonConstructorMethodNames'], |
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$class->getInterfaces() |
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)) |
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) |
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); |
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} |
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/** |
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* @param \ReflectionClass $class |
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* |
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* @return string[] (indexed numerically) |
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*/ |
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private function getNonConstructorMethodNames(\ReflectionClass $class) |
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{ |
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return array_values(array_map( |
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function (\ReflectionMethod $method) { |
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return $method->getName(); |
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}, |
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array_filter( |
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$class->getMethods(), |
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function (\ReflectionMethod $method) { |
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return $method->isPublic() && ! $method->isConstructor(); |
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} |
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) |
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)); |
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} |
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} |
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Ocramius /
Finalizer
