/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2012 University of California, Los Angeles
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
 *         卞超轶 Chaoyi Bian <bcy@pku.edu.cn>
 *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */

#ifndef SYNC_FULL_LEAF_H
#define SYNC_FULL_LEAF_H

#include "sync-leaf.h"

namespace Sync {

/**
 * @ingroup sync
 * @brief SYNC leaf for the full state (with support of Digest calculation) 
 */
class FullLeaf : public Leaf
{
public:
  /**
   * @brief Constructor to create an UPDATE diff leaf
   * @param info Smart pointer to leaf's name
   * @param seq  Initial sequence number of the pointer
   */
  FullLeaf (NameInfoConstPtr info, const SeqNo &seq);
  virtual ~FullLeaf () { }

  /**
   * @brief Get hash digest of the leaf
   *
   * The underlying Digest object is recalculated on every update or removal
   * (including updates of child classes)
   */
  const Digest &
  getDigest () const { return m_digest; }  

  // from Leaf
  virtual void
  setSeq (const SeqNo &seq);
  
private:
  void
  updateDigest ();

private:
  Digest m_digest;
};

typedef boost::shared_ptr<FullLeaf> FullLeafPtr;
typedef boost::shared_ptr<const FullLeaf> FullLeafConstPtr;

} // Sync

#endif // SYNC_FULL_LEAF_H