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#pragma clang system_header
// 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.
#pragma once
#include <memory>
#include <string>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/status.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/macros.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/visibility.h"
namespace arrow20 {
class Array;
class DataType;
class Field;
class MemoryPool;
namespace json {
/// \brief interface for conversion of Arrays
///
/// Converters are not required to be correct for arbitrary input- only
/// for unconverted arrays emitted by a corresponding parser.
class ARROW_EXPORT Converter {
public:
virtual ~Converter() = default;
/// convert an array
/// on failure, this converter may be promoted to another converter which
/// *can* convert the given input.
virtual Status Convert(const std::shared_ptr<Array>& in,
std::shared_ptr<Array>* out) = 0;
std::shared_ptr<DataType> out_type() const { return out_type_; }
MemoryPool* pool() { return pool_; }
protected:
ARROW_DISALLOW_COPY_AND_ASSIGN(Converter);
Converter(MemoryPool* pool, const std::shared_ptr<DataType>& out_type)
: pool_(pool), out_type_(out_type) {}
MemoryPool* pool_;
std::shared_ptr<DataType> out_type_;
};
/// \brief produce a single converter to the specified out_type
ARROW_EXPORT Status MakeConverter(const std::shared_ptr<DataType>& out_type,
MemoryPool* pool, std::shared_ptr<Converter>* out);
class ARROW_EXPORT PromotionGraph {
public:
virtual ~PromotionGraph() = default;
/// \brief produce a valid field which will be inferred as null
virtual std::shared_ptr<Field> Null(const std::string& name) const = 0;
/// \brief given an unexpected field encountered during parsing, return a type to which
/// it may be convertible (may return null if none is available)
virtual std::shared_ptr<DataType> Infer(
const std::shared_ptr<Field>& unexpected_field) const = 0;
/// \brief given a type to which conversion failed, return a promoted type to which
/// conversion may succeed (may return null if none is available)
virtual std::shared_ptr<DataType> Promote(
const std::shared_ptr<DataType>& failed,
const std::shared_ptr<Field>& unexpected_field) const = 0;
protected:
ARROW_DISALLOW_COPY_AND_ASSIGN(PromotionGraph);
PromotionGraph() = default;
};
ARROW_EXPORT const PromotionGraph* GetPromotionGraph();
} // namespace json
} // namespace arrow20
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