package jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer;

import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.DefaultEither;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;

public class AppendChildAt implements NodeEditor
{
	private final int pos;
	
	public AppendChildAt(int _pos)
	{
		pos = _pos;
	}

	@Override
	public Either<Error,TreeNode> edit(TreeNode _e)
	{
		Either<Error,TreeNode> either = _e.getChildren().addNewChildAt(pos);
		if(either.isA()){
			// error
			return either;
		}
		
		return DefaultEither.newB(either.b());
	}

}