package jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction;

import java.nio.ByteBuffer;

import fj.Ord;
import fj.data.List;
import fj.data.TreeMap;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNodeChildren;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;

public class DefaultTreeNode implements TreeNode
{
	//private final DefaultNode wrap;
	private List<TreeNode> children;
	private TreeMap<String,ByteBuffer> attrs;
	
	private static final List<TreeNode> NIL_LIST = List.nil();
	private static final TreeMap<String,ByteBuffer> NIL_MAP = TreeMap.empty(Ord.stringOrd);
	
	public DefaultTreeNode()
	{
		this(NIL_LIST,NIL_MAP);
	}
	
	public DefaultTreeNode(List<TreeNode> _children,TreeMap<String,ByteBuffer> _attrs)
	{
		attrs = _attrs;
		children = _children;
	}

	@Override
	public DefaultTreeNodeChildren getChildren()
	{
		return new DefaultTreeNodeChildren(children, attrs);
	}

	@Override
	public DefaultTreeNodeAttribute getAttributes()
	{
		return new DefaultTreeNodeAttribute(children, attrs);
	}
	
	@Override
	public DefaultTreeNode createNewNode(){
		return new DefaultTreeNode();
	}
	
	public DefaultTreeNode clone()
	{
		return new DefaultTreeNode(children,attrs);
	}

  @Override
  public Either<Error, TreeNode> appendRootNode() {
    TreeNodeChildren newRootChildren = new DefaultTreeNodeChildren(NIL_LIST, NIL_MAP);
    Either<Error, TreeNode> either = newRootChildren.addExistTreeNodeToChildren(this, 0);
    return either;
  }

	
}