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.store.impl.logger.DefaultOperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.OperationLog;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.DeleteChildAtOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.NodeOperation;
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 DeleteChildAt implements NodeEditor
{
	private final int pos;
	private OperationLog log;
	public DeleteChildAt(int _pos)
	{
		pos = _pos;
		log = new DefaultOperationLog();
	}

	@Override
	public Either<Error,TreeNode> edit(TreeNode _e)
	{
		NodeOperation deleteChildOperation = new DeleteChildAtOperation(pos);
		Either<Error,TreeNode> either = deleteChildOperation.invoke(_e);
		if(either.isA()){
			// error
			return either;
		}
		log = log.add(deleteChildOperation);
		return DefaultEither.newB(either.b());
	}

	@Override
	public OperationLog getLog() {
		return log;
	}
}