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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/json/options.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/status.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/key_value_metadata.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 Buffer;
class MemoryPool;
class KeyValueMetadata;
class ResizableBuffer;
namespace json {
struct Kind {
enum type : uint8_t {
kNull,
kBoolean,
kNumber,
kString,
kArray,
kObject,
kNumberOrString
};
static const std::string& Name(Kind::type);
static const std::shared_ptr<const KeyValueMetadata>& Tag(Kind::type);
static Kind::type FromTag(const std::shared_ptr<const KeyValueMetadata>& tag);
static Status ForType(const DataType& type, Kind::type* kind);
};
/// \class BlockParser
/// \brief A reusable block-based parser for JSON data
///
/// The parser takes a block of newline delimited JSON data and extracts Arrays
/// of unconverted strings which can be fed to a Converter to obtain a usable Array.
///
/// Note that in addition to parse errors (such as malformed JSON) some conversion
/// errors are caught at parse time:
/// - A null value in non-nullable column
/// - Change in the JSON kind of a column. For example, if an explicit schema is provided
/// which stipulates that field "a" is integral, a row of {"a": "not a number"} will
/// result in an error. This also applies to fields outside an explicit schema.
class ARROW_EXPORT BlockParser {
public:
virtual ~BlockParser() = default;
/// \brief Reserve storage for scalars parsed from a block of json
virtual Status ReserveScalarStorage(int64_t nbytes) = 0;
/// \brief Parse a block of data
virtual Status Parse(const std::shared_ptr<Buffer>& json) = 0;
/// \brief Extract parsed data
virtual Status Finish(std::shared_ptr<Array>* parsed) = 0;
/// \brief Return the number of parsed rows
int32_t num_rows() const { return num_rows_; }
/// \brief Construct a BlockParser
///
/// \param[in] pool MemoryPool to use when constructing parsed array
/// \param[in] options ParseOptions to use when parsing JSON
/// \param[out] out constructed BlockParser
static Status Make(MemoryPool* pool, const ParseOptions& options,
std::unique_ptr<BlockParser>* out);
static Status Make(const ParseOptions& options, std::unique_ptr<BlockParser>* out);
protected:
ARROW_DISALLOW_COPY_AND_ASSIGN(BlockParser);
explicit BlockParser(MemoryPool* pool) : pool_(pool) {}
MemoryPool* pool_;
int32_t num_rows_ = 0;
};
} // namespace json
} // namespace arrow20
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