//
// Copyright (C) 2015 The Android Open Source Project
//
// 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.
//

#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_OPERATIONS_GENERATOR_H_
#define UPDATE_ENGINE_PAYLOAD_GENERATOR_OPERATIONS_GENERATOR_H_

#include <vector>

#include <base/macros.h>

#include "update_engine/payload_generator/annotated_operation.h"
#include "update_engine/payload_generator/blob_file_writer.h"
#include "update_engine/payload_generator/payload_generation_config.h"

namespace chromeos_update_engine {

class OperationsGenerator {
 public:
  virtual ~OperationsGenerator() = default;

  // This method generates a list of operations to update from the partition
  // |old_part| to |new_part| and stores the generated operations in |aops|.
  // These operations are generated based on the given |config|.
  // The operations should be applied in the order specified in the list, and
  // they respect the payload version and type (delta or full) specified in
  // |config|.
  // The operations generated will refer to offsets in the file |blob_file|,
  // where this function stores the output, but not necessarily in the same
  // order as they appear in the |aops|.
  virtual bool GenerateOperations(
      const PayloadGenerationConfig& config,
      const PartitionConfig& old_part,
      const PartitionConfig& new_part,
      BlobFileWriter* blob_file,
      std::vector<AnnotatedOperation>* aops) = 0;

 protected:
  OperationsGenerator() = default;

 private:
  DISALLOW_COPY_AND_ASSIGN(OperationsGenerator);
};

}  // namespace chromeos_update_engine

#endif  // UPDATE_ENGINE_PAYLOAD_GENERATOR_OPERATIONS_GENERATOR_H_