IProjector.h

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//
// Created by Nico on 11/14/17.
//
 
#ifndef JODA_IPROJECTOR_H
#define JODA_IPROJECTOR_H
#include <joda/document/RapidJsonDocument.h>
#include <rapidjson/pointer.h>
 
namespace joda::query {
class IProjector {
 public:
  IProjector(const std::string &to) : ptr(to.c_str()), ptr_str(to){};
 
  virtual ~IProjector() = default;
 
  virtual void project(const RapidJsonDocument &json, RJDocument &newDoc,
                       bool view = false) {
    auto val = this->getVal(json, newDoc.GetAllocator());
    if (!val.IsNull()) ptr.Set(newDoc, val);
  }
 
  std::string getToPointer() const { return ptr_str; }
  const RJPointer &getRawToPointer() const { return ptr; }
 
  virtual std::string getType() = 0;
 
  virtual std::string toString() { return "'" + ptr_str + "':"; }
 
  virtual std::vector<std::string> getMaterializeAttributes() const = 0;
 
 protected:
  virtual RJValue getVal(const RapidJsonDocument &json,
                         RJMemoryPoolAlloc &alloc) = 0;
 
  RJPointer ptr;
  std::string ptr_str;
};
}  // namespace joda::query
#endif  // JODA_IPROJECTOR_H