/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_SQL_ENGINE_EXPR_TRANSLATE_
#define OCEANBASE_SQL_ENGINE_EXPR_TRANSLATE_

#include "lib/ob_name_def.h"
#include "sql/engine/expr/ob_expr_operator.h"
#include "lib/container/ob_array_serialization.h"
#include "lib/container/ob_fixed_array.h"

namespace oceanbase {
namespace sql {

class ObExprTranslate : public ObStringExprOperator {
public:
  explicit ObExprTranslate(common::ObIAllocator& alloc);
  virtual ~ObExprTranslate();

  virtual int calc_result_typeN(
      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;

  virtual int calc_resultN(
      common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;

  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  static int translate_hashmap(const common::ObString& ori_str, const common::ObString& from_str,
      const common::ObString& to_str, common::ObCollationType cs_type, common::ObIAllocator& tmp_alloc,
      common::ObIAllocator& res_alloc, common::ObString& res_str, bool& is_null);

private:
  typedef common::hash::ObHashMap<common::ObString, common::ObString> StringHashMap;

  static int insert_map(const common::ObString& key_str, const common::ObString& val_str,
      common::ObIAllocator& allocator, const common::ObFixedArray<size_t, common::ObIAllocator>& byte_num_key_str,
      const common::ObFixedArray<size_t, common::ObIAllocator>& byte_num_val_str, StringHashMap& ret_map);

  DISALLOW_COPY_AND_ASSIGN(ObExprTranslate);
};

}  // namespace sql
}  // namespace oceanbase

#endif /* OCEANBASE_SQL_ENGINE_EXPR_TRANSLATE_ */