IFileAccess.h

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* (c) Copyright 1998-2024 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#ifndef GaudiKernel_IFileAccess_H
#define GaudiKernel_IFileAccess_H
 
// Include Files
#include <GaudiKernel/IInterface.h>
#include <istream>
#include <memory>
#include <optional>
#include <string>
#include <vector>
 
class GAUDI_API IFileAccess : virtual public IInterface {
public:
  DeclareInterfaceID( IFileAccess, 3, 1 );
 
  virtual std::unique_ptr<std::istream> open( std::string const& url ) = 0;
 
  virtual std::optional<std::string> read( std::string const& url ) {
    auto is = open( url );
    if ( !is || !is->good() ) return std::nullopt;
    return std::string{ std::istreambuf_iterator<char>{ *is }, std::istreambuf_iterator<char>{} };
  }
 
  virtual const std::vector<std::string>& protocols() const = 0;
};
 
#endif // GaudiKernel_IFileAccess_H