[C++][Improvement] Redesign and unify the implementation of validatio…

…n in C++ Writer/Builder (#186)

cpp/include/gar/utils/writer_utils.h

@@ -0,0 +1,41 @@
+/** Copyright 2022 Alibaba Group Holding Limited.
+
+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 GAR_UTILS_WRITER_UTILS_H_
+#define GAR_UTILS_WRITER_UTILS_H_
+
+#include "gar/utils/macros.h"
+
+namespace GAR_NAMESPACE_INTERNAL {
+
+/**
+ * @brief The level for validating writing operations.
+ */
+enum class ValidateLevel : char {
+  /// To use the default validate level of the writer/builder.
+  default_validate = 0,
+  /// To skip the validation.
+  no_validate = 1,
+  /// Weak validation: check if the index, count, adj_list type, property group
+  /// and the size of the table passed to the writer/builder are valid.
+  weak_validate = 2,
+  /// Strong validation: except for the weak validation, also check if the
+  /// schema (including each property name and data type) of the intput data
+  /// passed to the writer/builder is consistent with that defined in the info.
+  strong_validate = 3
+};
+
+}  // namespace GAR_NAMESPACE_INTERNAL
+#endif  // GAR_UTILS_WRITER_UTILS_H_