Jackalope\Node::addMixin PHP Method

    public function addMixin($mixinName)
    {
        // Check if mixinName exists as a mixin type
        $typemgr = $this->session->getWorkspace()->getNodeTypeManager();
        $nodeType = $typemgr->getNodeType($mixinName);
        if (!$nodeType->isMixin()) {
            throw new ConstraintViolationException("Trying to add a mixin '{$mixinName}' that is a primary type");
        }
        $this->checkState();
        // TODO handle LockException & VersionException cases
        if ($this->hasProperty('jcr:mixinTypes')) {
            if (!in_array($mixinName, $this->properties['jcr:mixinTypes']->getValue())) {
                $this->properties['jcr:mixinTypes']->addValue($mixinName);
                $this->setModified();
            }
        } else {
            $this->setProperty('jcr:mixinTypes', array($mixinName), PropertyType::NAME);
            $this->setModified();
        }
    }