/**
 * 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_OB_SQL_EXPRESSION_FACTORY_H
#define OCEANBASE_SQL_OB_SQL_EXPRESSION_FACTORY_H

#include "lib/container/ob_array.h"
namespace oceanbase {
namespace sql {
class ObSqlExpressionFactory {
public:
  explicit ObSqlExpressionFactory(common::ObIAllocator& alloc) : alloc_(alloc)
  {}
  ~ObSqlExpressionFactory()
  {}

  template <typename T>
  int alloc(T*& sql_expression)
  {
    int ret = common::OB_SUCCESS;
    void* ptr = NULL;
    int64_t item_count = 0;
    if (OB_ISNULL(ptr = (alloc_.alloc(sizeof(T))))) {
      ret = common::OB_ALLOCATE_MEMORY_FAILED;
      SQL_ENG_LOG(ERROR, "fail to alloc memory", K(ret), K(ptr));
    } else {
      sql_expression = new (ptr) T(alloc_, item_count);
    }
    return ret;
  }

  template <typename T>
  int alloc(T*& sql_expression, int64_t item_count)
  {
    int ret = common::OB_SUCCESS;
    void* ptr = NULL;
    if (OB_ISNULL(ptr = (alloc_.alloc(sizeof(T))))) {
      ret = common::OB_ALLOCATE_MEMORY_FAILED;
      SQL_ENG_LOG(ERROR, "fail to alloc memory", K(ret), K(ptr));
    } else {
      sql_expression = new (ptr) T(alloc_, item_count);
    }
    return ret;
  }
  void destroy()
  {
    // nothing todo
  }
  // template<typename T>
  //    void free(T *&sql_expression)
  //    {
  //      if (OB_ISNULL(sql_expression)) {
  //      } else {
  //        sql_expression->~ObSqlExpression();
  //        alloc_.free(sql_expression);
  //        sql_expression = NULL;
  //      }
  //    }
private:
  DISALLOW_COPY_AND_ASSIGN(ObSqlExpressionFactory);

private:
  common::ObIAllocator& alloc_;
};
}  // namespace sql
}  // namespace oceanbase
#endif