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src/sql/engine/expr/ob_sql_expression_factory.h

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+/**
+ * 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