copyable_abstraction.h

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#ifndef HEDGEHOG_COPYABLE_ABSTRACTION_H_
#define HEDGEHOG_COPYABLE_ABSTRACTION_H_
#include <memory>
#include <sstream>
#include "../../../tools/concepts.h"
#include "node/node_abstraction.h"
 
namespace hh {
namespace core {
namespace abstraction {
 
template<tool::CopyableNode CopyableNode>
class CopyableAbstraction {
 private:
  CopyableNode *const copyableNode_ = nullptr; 
  std::unique_ptr<std::set<std::shared_ptr<CopyableNode>>> nodeCopies_ = nullptr; 
 
 public:
  explicit CopyableAbstraction(CopyableNode *const copyableNode)
  : copyableNode_(copyableNode),
    nodeCopies_(std::make_unique<std::set<std::shared_ptr<CopyableNode>>>()){}
 
  virtual ~CopyableAbstraction() = default;
 
 protected:
 
  std::shared_ptr<CopyableNode> callCopy() {
    auto copy = copyableNode_->copy();
 
    if (copy == nullptr) {
      std::ostringstream oss;
      if (auto node = dynamic_cast<NodeAbstraction *>(this))
        oss
            << "A copy for the node \"" << node->name()
            << "\" has been invoked but return nullptr. To fix this error, overload the "
            << tool::typeToStr<CopyableNode>()
            << "::copy function and return a valid object.";
      else {
        oss
            << "A copy for the node has been invoked but return nullptr. To fix this error, overload the "
            << tool::typeToStr<CopyableNode>()
            << "::copy function and return a valid object.";
      }
      throw (std::runtime_error(oss.str()));
    }
 
    if (nodeCopies_->find(copy) != nodeCopies_->cend()) {
      std::ostringstream oss;
      if (auto node = dynamic_cast<NodeAbstraction *>(this)) {
        oss << "A copy for the node \"" << node->name()
            << "\" has been invoked and return a copy already registered. Each copy of a node should be different.";
      }else {
        oss << "A copy for the node has been invoked and return a copy already registered. Each copy of a node "
               "should be different.";
      }
      throw (std::runtime_error(oss.str()));
    }
    nodeCopies_->insert(copy);
    return copy;
  }
};
}
}
}
#endif //HEDGEHOG_COPYABLE_ABSTRACTION_H_