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https://github.com/aykhans/AzSuicideDataVisualization.git
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95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <memory>
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#include <string>
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#include "arrow/status.h"
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#include "arrow/util/macros.h"
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#include "arrow/util/visibility.h"
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namespace arrow {
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class Array;
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class DataType;
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class Field;
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class MemoryPool;
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namespace json {
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/// \brief interface for conversion of Arrays
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///
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/// Converters are not required to be correct for arbitrary input- only
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/// for unconverted arrays emitted by a corresponding parser.
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class ARROW_EXPORT Converter {
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public:
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virtual ~Converter() = default;
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/// convert an array
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/// on failure, this converter may be promoted to another converter which
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/// *can* convert the given input.
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virtual Status Convert(const std::shared_ptr<Array>& in,
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std::shared_ptr<Array>* out) = 0;
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std::shared_ptr<DataType> out_type() const { return out_type_; }
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MemoryPool* pool() { return pool_; }
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protected:
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ARROW_DISALLOW_COPY_AND_ASSIGN(Converter);
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Converter(MemoryPool* pool, const std::shared_ptr<DataType>& out_type)
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: pool_(pool), out_type_(out_type) {}
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MemoryPool* pool_;
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std::shared_ptr<DataType> out_type_;
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};
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/// \brief produce a single converter to the specified out_type
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ARROW_EXPORT Status MakeConverter(const std::shared_ptr<DataType>& out_type,
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MemoryPool* pool, std::shared_ptr<Converter>* out);
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class ARROW_EXPORT PromotionGraph {
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public:
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virtual ~PromotionGraph() = default;
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/// \brief produce a valid field which will be inferred as null
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virtual std::shared_ptr<Field> Null(const std::string& name) const = 0;
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/// \brief given an unexpected field encountered during parsing, return a type to which
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/// it may be convertible (may return null if none is available)
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virtual std::shared_ptr<DataType> Infer(
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const std::shared_ptr<Field>& unexpected_field) const = 0;
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/// \brief given a type to which conversion failed, return a promoted type to which
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/// conversion may succeed (may return null if none is available)
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virtual std::shared_ptr<DataType> Promote(
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const std::shared_ptr<DataType>& failed,
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const std::shared_ptr<Field>& unexpected_field) const = 0;
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protected:
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ARROW_DISALLOW_COPY_AND_ASSIGN(PromotionGraph);
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PromotionGraph() = default;
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};
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ARROW_EXPORT const PromotionGraph* GetPromotionGraph();
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} // namespace json
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} // namespace arrow
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