ResourceRetriever.hpp

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#ifndef DART_COMMON_RESOURCERETRIEVER_HPP_
#define DART_COMMON_RESOURCERETRIEVER_HPP_
 
#include <memory>
#include <string>
#include "dart/common/Resource.hpp"
#include "dart/common/Uri.hpp"
 
namespace dart {
namespace common {
 
class ResourceRetriever
{
public:
  virtual ~ResourceRetriever() = default;
 
  virtual bool exists(const Uri& uri) = 0;
 
  virtual ResourcePtr retrieve(const Uri& uri) = 0;
 
  virtual std::string readAll(const Uri& uri);
 
  virtual std::string getFilePath(const Uri& uri);
 
  // We don't const-qualify for exists, retrieve, readAll, and getFilePath here.
  // Derived classes of ResourceRetriever will be interacting with external
  // resources that you don't necessarily have control over so we cannot
  // guarantee that you get the same result every time with the same input Uri.
  // Indeed, const-qualification for those functions is pointless.
};
 
using ResourceRetrieverPtr = std::shared_ptr<ResourceRetriever>;
 
} // namespace common
} // namespace dart
 
#endif // ifndef DART_COMMON_RESOURCERETRIEVER_HPP_