PointerProvider.h

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//
// Created by Nico Schäfer on 11/13/17.
//
 
#ifndef JODA_POINTERPROVIDER_H
#define JODA_POINTERPROVIDER_H
 
#include <rapidjson/fwd.h>
#include <rapidjson/pointer.h>
#include <variant>
#include "IValueProvider.h"
 
namespace joda::query {
class PointerProvider : public joda::query::IValueProvider {
 public:
  PointerProvider(const std::string &str);
 
  bool comparable() const override;
  bool equalizable() const override;
  std::unique_ptr<IValueProvider> duplicate() const override;
  std::string toString() const override;
  std::string getAttributeString() const;
  bool isConst() const override;
  RJValue getAtomValue(const RapidJsonDocument &json,
                       RJMemoryPoolAlloc &alloc) const override;
  const RJValue *getValue(const RapidJsonDocument &json,
                          RJMemoryPoolAlloc &alloc) const override;
  void getAttributes(std::vector<std::string> &vec) const override;
  std::vector<std::string> getAttributes() const override;
  bool isString() const override;
  bool isNumber() const override;
  bool isBool() const override;
  bool isObject() const override;
  bool isArray() const override;
  bool isAny() const override;
  std::string getName() const override;
  IValueType getReturnType() const override;
 
  std::variant<const RJValue, std::optional<const RJValue *>,
               const VirtualObject *>
  getPointerIfExists(const RapidJsonDocument &json,
                     RJMemoryPoolAlloc &alloc) const;
 
 protected:
  RJPointer pointer;
  std::string ptrStr;
 
 public:
  template <class Handler>
  bool Accept(const RapidJsonDocument &json, RJMemoryPoolAlloc &alloc,
              Handler &h) const {
    if (json.isView()) {
      auto &v = json.getView();
      DCHECK(v != nullptr);
      if (ptrStr.empty()) {
        return v->Accept(h);
      } else {
        v->setPrefix(ptrStr);
        auto res = v->Accept(h);
        v->setPrefix("");
        return res;
      }
    } else {
      auto ptr = json.Get(pointer);
      if (ptr != nullptr) {
        return ptr->Accept(h);
      } else
        h.Null();
      return true;
    }
  }
 
  bool objIsPointerEvaluatable(const RapidJsonDocument &json) const;
  const VirtualObject *getVO(const RapidJsonDocument &json) const;
};
}  // namespace joda::query
 
#endif  // JODA_POINTERPROVIDER_H