package foundation.dao.preload;

import java.util.Comparator;

import foundation.json.IJSONWriter;
import foundation.util.MapList;

public abstract class Node {

	protected Node parent;
	protected MapList<String, Node> children;
	
	
	public Node() {
		children = new MapList<String, Node>();
	}
	
	public abstract String getId();
	
	public abstract String getParentId();

	public void addOneChild(Node item) {
		children.add(item.getId(), item);
	}

	public Comparator<Node> createComparator() {
		return null;
	}
	
	public void sort(Comparator<Node> comparator) {
		//1. 创建comparator
		if (comparator == null) {
			comparator = createComparator();
		}
		
		if (comparator == null) {
			return;
		}
		
		//2. 递归调用子节点进行排序
		for (Node child: children) {
			
			if (child.containsChildren()) {
				child.sort(comparator);
			}
		}
		
		//3. 排序自己在子节点
		children.sortList(comparator);
	}

	@Override
	public String toString() {
		return getId();
	}
	
	@SuppressWarnings("unchecked")
	public <T> T getParent() {
		return (T)parent;
	}

	public MapList<String, Node> getChildren() {
		return children;
	}
	
	public boolean containsChildren() {
		return !children.isEmpty();
	}
	
	public abstract void writeJSON(IJSONWriter writer);
	
	public abstract void writeJSONBody(IJSONWriter writer);

}