package alice.jungle.operations;

import java.nio.ByteBuffer;

import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.Command;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.NodeOperation;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.EditableNode;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;

import org.msgpack.annotation.Message;

import alice.jungle.datasegment.store.transformer.NetworkAppendChildAt;


@Message
public class NetworkAppendChildAtOperation implements NodeOperation {
	
	//	private final int pos;
	/* MessagePack can not handle final.*/
	private int pos;
	
	/* Position -1 represent root position. */
	public NetworkAppendChildAtOperation() { pos = -2; }
	
	public NetworkAppendChildAtOperation(int _pos) {
		pos = _pos;
	}
	
	@Override
	public Command getCommand() {
		return Command.APPEND_CHILD;
	}
	
	@Override
	public <T extends EditableNode<T>> Either<Error, T> invoke(T _target) {
		NetworkAppendChildAt appendChildAt = new NetworkAppendChildAt(pos);
		return appendChildAt.edit(_target);
	}

	@Override
	public int getPosition() {
		return pos;
	}

	@Override
	public String getKey() {
		return null;
	}

	@Override
	public ByteBuffer getValue() {
		return null;
	}
}