FileReadTool.cpp

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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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#include <GaudiKernel/AlgTool.h>
#include <GaudiKernel/IFileAccess.h>
#include <fstream>
 
struct FileReadTool : extends<AlgTool, IFileAccess> {
  using extends::extends;
 
  std::unique_ptr<std::istream> open( std::string const& url ) override {
    // remove the optional "file://" from the beginning of the url
    constexpr auto prefix = std::string_view{ "file://" };
    return std::make_unique<std::ifstream>( url.compare( 0, prefix.size(), prefix ) == 0 ? url.substr( prefix.size() )
                                                                                         : url );
  }
 
  const std::vector<std::string>& protocols() const override {
    static const std::vector<std::string> s_protocols = { { "file" } };
    return s_protocols;
  }
};
 
DECLARE_COMPONENT( FileReadTool )