text: /***************************************************************************
   *
   * Copyright (c) 2015 Baidu, Inc. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   **************************************************************************/
  // Author: Zhang Yuncong (zhangyuncong@baidu.com)
  
  #ifndef FLUME_RUNTIME_KV_ITERATOR_H_
  #define FLUME_RUNTIME_KV_ITERATOR_H_
  
  #include <map>
  #include <string>
  #include <vector>
  
  #include "toft/base/string/string_piece.h"
  
  namespace baidu {
  namespace flume {
  namespace runtime {
  
  class KVIterator {
  public:
      virtual ~KVIterator() {}
  
      virtual bool Next() = 0;
  
      virtual void Reset() = 0;
  
      virtual void Done() = 0;
  
      virtual const std::vector<toft::StringPiece>& Keys() const = 0;
  
      virtual void* Value() const = 0;
  
      virtual toft::StringPiece ValueStr() const = 0;
  };
  
  }  // namespace runtime
  }  // namespace flume
  }  // namespace baidu
  
  #endif  // FLUME_RUNTIME_KV_ITERATOR_H_
  