FixTESPath.cpp

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#include "GaudiKernel/IDataHandleHolder.h"
#include "GaudiKernel/MsgStream.h"
#include "boost/tokenizer.hpp"
#include <memory>
#include <numeric>
#include <string>
#include <string_view>
 
namespace {
  // update DataHandles to point to full TES location
  //
  template <typename F>
  class DHHFixer : public IDataHandleVisitor {
    F m_f;
 
  public:
    DHHFixer( F f ) : m_f( std::move( f ) ) {}
 
    void visit( const IDataHandleHolder* idhh ) override {
      if ( !idhh ) return;
 
      std::string r;
      for ( auto h : idhh->inputHandles() ) {
        r = m_f( h->objKey() );
        if ( r != h->objKey() ) h->updateKey( r );
      }
      for ( auto h : idhh->outputHandles() ) {
        r = m_f( h->objKey() );
        if ( r != h->objKey() ) h->updateKey( r );
      }
    }
  };
 
  template <typename F>
  auto make_unique_DHHFixer( F f ) {
    return std::make_unique<DHHFixer<F>>( std::move( f ) );
  }
 
} // namespace
 
namespace FixTESPathDetails {
 
  // ============================================================================
  // Returns the full correct event location given the rootInTes settings
  // ============================================================================
  std::string fullTESLocation( std::string_view location, std::string_view rit ) {
    // The logic is:
    // if no R.I.T., give back location
    // if R.I.T., this is the mapping:
    // (note that R.I.T. contains a trailing '/')
    //  location       -> result
    //  -------------------------------------------------
    //  ""             -> R.I.T.[:-1]      ("rit")
    //  "/Event"       -> R.I.T.[:-1]      ("rit")
    //  "/Event/MyObj" -> R.I.T. + "MyObj" ("rit/MyObj")
    //  "MyObj"        -> R.I.T. + "MyObj" ("rit/MyObj")
    return rit.empty()                                    ? std::string{ location }
           : location.empty() || ( location == "/Event" ) ? std::string{ rit.substr( 0, rit.size() - 1 ) }
           : location.compare( 0, 7, "/Event/" ) == 0     ? std::string{ rit }.append( location.substr( 7 ) )
           : location.compare( 0, 1, "/" ) == 0           ? std::string{ rit }.append( location.substr( 1 ) )
                                                          : std::string{ rit }.append( location );
  }
 
  std::unique_ptr<IDataHandleVisitor> fixDataHandlePath( std::string_view rit, std::string rootName, MsgStream* dbg ) {
    if ( !rootName.empty() && '/' != rootName.back() ) rootName += "/";
    return make_unique_DHHFixer( [rit, rootName = std::move( rootName ), dbg]( std::string const& location ) {
      auto tokens = boost::tokenizer{ location, boost::char_separator{ ":" } };
      auto result =
          std::accumulate( tokens.begin(), tokens.end(), std::string{}, [&]( std::string s, std::string_view tok ) {
            std::string r = fullTESLocation( tok, rit );
            // check whether we have an absolute path if yes use it - else prepend DataManager Root
            if ( r[0] != '/' ) r = rootName + r;
            return s.empty() ? r : s + ':' + r;
          } );
      if ( result != location && dbg ) ( *dbg ) << "Changing " << location << " to " << result << endmsg;
      return result;
    } );
  }
} // namespace FixTESPathDetails