public class DataNode {
	public ASTNode node; //所代表的的AST節點
	public int label; //編號
	public List<Integer> childrenLables = new ArrayList<>(); //直接的子節點的編號
	public List<ASTNode> childrenNodes = new ArrayList<>(); //直接的子節點
	public boolean isLeaf = false; //是否是葉子節點
	public String nodeType = "unknown";
}




public static int ID = 0; //用來編號

// 輸入的是CompilationUnit根節點， label為0
public static void getDirectChildren(ASTNode node, int label, Map<Integer, DataNode> Nodes){
	
	//先建立一個節點資料結構
	DataNode myNode = new DataNode();
	Nodes.put(label, myNode);
	myNode.label = label;
	myNode.node = node;
	myNode.nodeType = node.getClass().toString();
	List listProperty = node.structuralPropertiesForType();
	boolean hasChildren = false;
	for(int i = 0; i < listProperty.size(); i++){
		StructuralPropertyDescriptor propertyDescriptor = (StructuralPropertyDescriptor) listProperty.get(i);
		if(propertyDescriptor instanceof ChildListPropertyDescriptor){//ASTNode列表
			ChildListPropertyDescriptor childListPropertyDescriptor = (ChildListPropertyDescriptor)propertyDescriptor;
			Object children = node.getStructuralProperty(childListPropertyDescriptor);
			List<ASTNode> childrenNodes = (List<ASTNode>)children;
			for(ASTNode childNode: childrenNodes){
				//獲取所有節點
				if(childNode == null)
					continue;
				hasChildren = true;
				myNode.childrenNodes.add(childNode);
				myNode.childrenLables.add((++ID));
				getDirectChildren(childNode, ID, Nodes);//繼續遞迴
				//System.out.println("childrenList:   "+childNode+"   "+childNode.getClass());
			}
			
		}else if(propertyDescriptor instanceof ChildPropertyDescriptor){//一個ASTNode
			ChildPropertyDescriptor childPropertyDescriptor = (ChildPropertyDescriptor)propertyDescriptor;
			Object child = node.getStructuralProperty(childPropertyDescriptor);
			ASTNode childNode = (ASTNode)child;
			if(childNode == null)
				continue;
			hasChildren = true;
			//獲取了這個節點
			myNode.childrenNodes.add(childNode);
			myNode.childrenLables.add((++ID));
			getDirectChildren(childNode, ID, Nodes);//繼續遞迴
			
			//System.out.println("child:   "+childNode +"  "+childNode.getClass());
		}
	}
	if(hasChildren){
		//進行遞迴子節點
		myNode.isLeaf = false;
	}
	else{
		//結束，是葉子結點
		myNode.isLeaf = true;
	}
}