public void buildParentNode(NodeModel rootNode) {
        if (rootNode.getNodeKey() == null) {
            rootNode.setNodeKey(rootNode.getNodeName());
        }
        List<ConditionNode> conditionNodes = rootNode.getConditionNodes();
        if (null != conditionNodes) {
            for (ConditionNode conditionNode : conditionNodes) {
                NodeModel conditionChildNode = conditionNode.getChildNode();
                if (null != conditionChildNode) {
                    conditionChildNode.setParentNode(rootNode);
                    this.buildParentNode(conditionChildNode);
                }
            }
        }
        List<NodeModel> parallelNodes = rootNode.getParallelNodes();
        if (null != parallelNodes) {
            for (NodeModel nodeModel : parallelNodes) {
                nodeModel.setParentNode(rootNode);
                this.buildParentNode(nodeModel);
            }
        }
        NodeModel childNode = rootNode.getChildNode();
        if (null != childNode) {
            childNode.setParentNode(rootNode);
            this.buildParentNode(childNode);
        }
    }