YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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//   http://www.apache.org/licenses/LICENSE-2.0

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// under the License.

//

// The following only applies to changes made to this file as part of YugaByte development.

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// Portions Copyright (c) YugaByte, Inc.

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// 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

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// 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

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#ifndef YB_UTIL_JSONREADER_H_

#define YB_UTIL_JSONREADER_H_

#include <stdint.h>

#include <string>

#include <vector>

#include <rapidjson/document.h>

#include "yb/gutil/macros.h"

#include "yb/util/status_fwd.h"

namespace yb {

// Wraps the JSON parsing functionality of rapidjson::Document.

//

// Unlike JsonWriter, this class does not hide rapidjson internals from

// clients. That's because there's just no easy way to implement object and

// array parsing otherwise. At most, this class aspires to be a simpler

// error-handling wrapper for reading and parsing.

class JsonReader {

 public:

  explicit JsonReader(std::string text);

  ~JsonReader();

  CHECKED_STATUS Init();

  // Extractor methods.

  //

  // If 'field' is not NULL, will look for a field with that name in the

  // given object, returning Status::NotFound if it cannot be found. If

  // 'field' is NULL, will try to convert 'object' directly into the

  // desire type.

  CHECKED_STATUS ExtractBool(const rapidjson::Value* object,

                      const char* field,

                      bool* result) const;

  CHECKED_STATUS ExtractInt32(const rapidjson::Value* object,

                      const char* field,

                      int32_t* result) const;

  CHECKED_STATUS ExtractInt64(const rapidjson::Value* object,

                      const char* field,

                      int64_t* result) const;

  CHECKED_STATUS ExtractString(const rapidjson::Value* object,

                       const char* field,

                       std::string* result) const;

  // 'result' is only valid for as long as JsonReader is alive.

  CHECKED_STATUS ExtractObject(const rapidjson::Value* object,

                       const char* field,

                       const rapidjson::Value** result) const;

  // 'result' is only valid for as long as JsonReader is alive.

  CHECKED_STATUS ExtractObjectArray(const rapidjson::Value* object,

                            const char* field,

                            std::vector<const rapidjson::Value*>* result) const;

  const rapidjson::Value* root() const { return &document_; }

 private:

  CHECKED_STATUS ExtractField(const rapidjson::Value* object,

                      const char* field,

                      const rapidjson::Value** result) const;

  std::string text_;

  rapidjson::Document document_;

  DISALLOW_COPY_AND_ASSIGN(JsonReader);

};

} // namespace yb

#endif // YB_UTIL_JSONREADER_H_