Jackalope\NodeType\NodeType::canAddChildNode PHP Method

    public function canAddChildNode($childNodeName, $nodeTypeName = null, $throw = false)
    {
        $childDefs = $this->getChildNodeDefinitions();
        if ($nodeTypeName) {
            try {
                $nodeType = $this->nodeTypeManager->getNodeType($nodeTypeName);
                if ($nodeType->isMixin() || $nodeType->isAbstract()) {
                    if ($throw) {
                        if ($nodeType->isMixin()) {
                            $errorMsg = "Can't add the child node '{$childNodeName}' for node type '{$nodeTypeName}' because the node type is mixin.";
                        } else {
                            $errorMsg = "Can't add the child node '{$childNodeName} for node type '{$nodeTypeName}' because the node type is abstract.";
                        }
                        throw new ConstraintViolationException($errorMsg);
                    }
                    return false;
                }
            } catch (NoSuchNodeTypeException $nsnte) {
                if ($throw) {
                    throw $nsnte;
                }
                return false;
            } catch (Exception $e) {
                if ($throw) {
                    $errorMsg = "Can't add the child node '{$childNodeName}' for node type '{$nodeTypeName}' because of an Exception: " . $e->getMessage();
                    throw new ConstraintViolationException($errorMsg, null, $e);
                }
                return false;
            }
        }
        foreach ($childDefs as $child) {
            if ('*' === $child->getName() || $childNodeName === $child->getName()) {
                if ($nodeTypeName === null) {
                    if ($child->getDefaultPrimaryTypeName() != null) {
                        return true;
                    }
                } else {
                    foreach ($child->getRequiredPrimaryTypeNames() as $type) {
                        if ($nodeType->isNodeType($type)) {
                            return true;
                        }
                    }
                }
            }
        }
        if ($throw) {
            $errorMsg = "Can't add the child node '{$childNodeName}' for node type '{$nodeTypeName}' because there is no definition for a child with that name.";
            throw new ConstraintViolationException($errorMsg);
        }
        return false;
    }