| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| // This module contains the logical parquet-cpp types (independent of Thrift |
| // structures), schema nodes, and related type tools |
| |
| #ifndef PARQUET_SCHEMA_INTERNAL_H |
| #define PARQUET_SCHEMA_INTERNAL_H |
| |
| #include <cstdint> |
| #include <memory> |
| #include <vector> |
| |
| #include "parquet/parquet_types.h" |
| #include "parquet/schema.h" |
| #include "parquet/types.h" |
| #include "parquet/util/macros.h" |
| #include "parquet/util/visibility.h" |
| |
| namespace parquet { |
| namespace schema { |
| |
| // ---------------------------------------------------------------------- |
| // Conversion from Parquet Thrift metadata |
| |
| std::shared_ptr<SchemaDescriptor> FromParquet( |
| const std::vector<format::SchemaElement>& schema); |
| |
| class FlatSchemaConverter { |
| public: |
| FlatSchemaConverter(const format::SchemaElement* elements, int length) |
| : elements_(elements), length_(length), pos_(0), current_id_(0) {} |
| |
| std::unique_ptr<Node> Convert(); |
| |
| private: |
| const format::SchemaElement* elements_; |
| int length_; |
| int pos_; |
| int current_id_; |
| |
| int next_id() { return current_id_++; } |
| |
| const format::SchemaElement& Next(); |
| |
| std::unique_ptr<Node> NextNode(); |
| }; |
| |
| // ---------------------------------------------------------------------- |
| // Conversion to Parquet Thrift metadata |
| |
| void ToParquet(const GroupNode* schema, std::vector<format::SchemaElement>* out); |
| |
| // Converts nested parquet schema back to a flat vector of Thrift structs |
| class SchemaFlattener { |
| public: |
| SchemaFlattener(const GroupNode* schema, std::vector<format::SchemaElement>* out); |
| |
| void Flatten(); |
| |
| private: |
| const GroupNode* root_; |
| std::vector<format::SchemaElement>* elements_; |
| }; |
| |
| } // namespace schema |
| } // namespace parquet |
| |
| #endif // PARQUET_SCHEMA_INTERNAL_H |