FileFinder.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidAPI/FileFinder.h"
#include "MantidAPI/ArchiveSearchFactory.h"
#include "MantidAPI/FrameworkManager.h"
#include "MantidAPI/IArchiveSearch.h"
#include "MantidAPI/ISISInstrumentDataCache.h"
#include "MantidKernel/ConfigService.h"
#include "MantidKernel/Exception.h"
#include "MantidKernel/FacilityInfo.h"
#include "MantidKernel/Glob.h"
#include "MantidKernel/InstrumentInfo.h"
#include "MantidKernel/Strings.h"
 
#include "MantidKernel/StringTokenizer.h"
#include <boost/lexical_cast.hpp>
#include <boost/regex.hpp>
 
#include <algorithm>
#include <cctype>
 
#include <boost/algorithm/string.hpp>
 
#include <filesystem>
#include <json/value.h>
 
namespace {
Mantid::Kernel::Logger g_log("FileFinder");
 
bool containsWildCard(const std::string &ext) { return std::string::npos != ext.find('*'); }
 
bool isASCII(const std::string &str) {
  return !std::any_of(str.cbegin(), str.cend(), [](char c) { return static_cast<unsigned char>(c) > 127; });
}
 
} // namespace
 
namespace Mantid::API {
using std::string;
 
// this allowed string could be made into an array of allowed, currently used
// only by the ISIS SANS group
const std::string FileFinderImpl::ALLOWED_SUFFIX = "-add";
//----------------------------------------------------------------------
// Public member functions
//----------------------------------------------------------------------
FileFinderImpl::FileFinderImpl() {
  // Make sure plugins are loaded
  FrameworkManager::Instance().loadPlugins();
 
// determine from Mantid property how sensitive Mantid should be
#ifdef _WIN32
  m_globOption = Kernel::Glob::GLOB_DEFAULT;
#else
  setCaseSensitive(Kernel::ConfigService::Instance().getValue<bool>("filefinder.casesensitive").value_or(false));
#endif
}
 
void FileFinderImpl::setCaseSensitive(const bool cs) {
  if (cs)
    m_globOption = Kernel::Glob::GLOB_DEFAULT;
  else
    m_globOption = Kernel::Glob::GLOB_CASELESS;
}
 
bool FileFinderImpl::getCaseSensitive() const { return (m_globOption == Kernel::Glob::GLOB_DEFAULT); }
 
std::string FileFinderImpl::getFullPath(const std::string &filename, const bool ignoreDirs) const {
  return Kernel::ConfigService::Instance().getFullPath(filename, ignoreDirs, m_globOption);
}
 
std::string FileFinderImpl::extractAllowedSuffix(std::string &userString) const {
  if (userString.find(ALLOWED_SUFFIX) == std::string::npos) {
    // short cut processing as normally there is no suffix
    return "";
  }
 
  // ignore any file extension in checking if a suffix is present
  std::filesystem::path entry(userString);
  std::string noExt(entry.stem().string());
  const size_t repNumChars = ALLOWED_SUFFIX.size();
  if (noExt.find(ALLOWED_SUFFIX) == noExt.size() - repNumChars) {
    userString.replace(userString.size() - repNumChars, repNumChars, "");
    return ALLOWED_SUFFIX;
  }
  return "";
}
 
const Kernel::InstrumentInfo FileFinderImpl::getInstrument(const string &hint,
                                                           const bool returnDefaultIfNotFound) const {
  if ((!hint.empty()) && (!isdigit(hint[0]))) {
    string instrName(hint);
    std::filesystem::path path(instrName);
    instrName = path.filename().string();
    if (instrName.starts_with("PG3") || instrName.starts_with("pg3")) {
      instrName = "PG3";
    }
    // We're extending this nasty hack to accomodate data archive searching for
    // SANS2D.
    // While this certainly shouldn't be considered good practice, #7515 exists
    // to
    // completely redesign FileFinder -- this quick fix will have to do until
    // all this
    // code gets an overhaul as part of that ticket.  Please think twice before
    // adding
    // any more instruments to this list.
    else if (instrName.starts_with("SANS2D") || instrName.starts_with("sans2d")) {
      instrName = "SANS2D";
    } else {
      // go forwards looking for the run number to start
      {
        const auto it = std::find_if(instrName.begin(), instrName.end(), isdigit);
        const auto nChars = std::distance(instrName.begin(), it);
        instrName.resize(nChars);
      }
 
      // go backwards looking for the instrument name to end - gets around
      // delimiters
      if (!instrName.empty()) {
        const auto it = std::find_if(instrName.rbegin(), instrName.rend(), isalpha);
        const auto nChars = std::distance(it, instrName.rend());
        instrName.resize(nChars);
      }
    }
    try {
      const Kernel::InstrumentInfo instrument = Kernel::ConfigService::Instance().getInstrument(instrName);
      return instrument;
    } catch (Kernel::Exception::NotFoundError &e) {
      g_log.debug() << e.what() << "\n";
      if (!returnDefaultIfNotFound) {
        throw e;
      }
    }
  }
  return Kernel::ConfigService::Instance().getInstrument();
}
 
std::pair<std::string, std::string> FileFinderImpl::toInstrumentAndNumber(const std::string &hint) const {
  g_log.debug() << "toInstrumentAndNumber(" << hint << ")\n";
  std::string instrPart;
  std::string runPart;
 
  if (isdigit(hint[0])) {
    instrPart = Kernel::ConfigService::Instance().getInstrument().shortName();
    runPart = hint;
  } else {
    std::string::const_reverse_iterator it = std::find_if(hint.rbegin(), hint.rend(), std::not_fn(isdigit));
    // No non-digit or all non-digits
    if (it == hint.rend() || it == hint.rbegin()) {
      throw std::invalid_argument("Malformed hint to FileFinderImpl::makeFileName: " + hint);
    }
    std::string::size_type nChars = std::distance(it, hint.rend());
 
    // Add in special test for PG3
    if (boost::algorithm::istarts_with(hint, "PG3")) {
      instrPart = "PG3";
      nChars = instrPart.length();
    }
    // Another nasty check for SANS2D.  Will do until FileFinder redesign.
    else if (boost::algorithm::istarts_with(hint, "SANS2D")) {
      instrPart = "SANS2D";
      nChars = instrPart.length();
    } else {
      instrPart = hint.substr(0, nChars);
    }
 
    runPart = hint.substr(nChars);
  }
 
  unsigned int irunPart(0);
  try {
    irunPart = boost::lexical_cast<unsigned int>(runPart);
  } catch (boost::bad_lexical_cast &) {
    std::ostringstream os;
    os << "Cannot convert '" << runPart << "' to run number.";
    throw std::invalid_argument(os.str());
  }
  Kernel::InstrumentInfo instr = Kernel::ConfigService::Instance().getInstrument(instrPart);
  size_t nZero = instr.zeroPadding(irunPart);
  // remove any leading zeros in case there are too many of them
  std::string::size_type i = runPart.find_first_not_of('0');
  runPart.erase(0, i);
  while (runPart.size() < nZero)
    runPart.insert(0, "0");
  if (runPart.size() > nZero && nZero != 0) {
    throw std::invalid_argument("Run number does not match instrument's zero padding");
  }
 
  instrPart = instr.filePrefix(irunPart);
 
  return std::make_pair(instrPart, runPart);
}
 
std::string FileFinderImpl::makeFileName(const std::string &hint, const Kernel::InstrumentInfo &instrument) const {
  if (hint.empty())
    return "";
 
  std::string filename(hint);
  const std::string suffix = extractAllowedSuffix(filename);
  const std::string shortName = instrument.shortName();
  std::string delimiter = instrument.delimiter();
 
  // see if starts with the provided instrument name
  if (filename.substr(0, shortName.size()) == shortName) {
    filename = filename.substr(shortName.size());
    if ((!delimiter.empty()) && (filename.substr(0, delimiter.size()) == delimiter))
      filename = filename.substr(delimiter.size());
 
    filename = shortName + filename;
  }
 
  auto [instrumentName, runNumber] = toInstrumentAndNumber(filename);
 
  // delimiter and suffix might be empty strings
  filename = instrumentName + delimiter + runNumber + suffix;
  return filename;
}
 
std::string FileFinderImpl::getExtension(const std::string &filename, const std::vector<std::string> &exts) const {
  g_log.debug() << "getExtension(" << filename << ", exts[" << exts.size() << "])\n";
 
  // go through the list of supplied extensions
  for (const auto &ext : exts) {
    std::string extension = toUpper(ext);
    if (extension.rfind('*') == extension.size() - 1) // there is a wildcard at play
    {
      extension.resize(extension.rfind('*'));
    }
 
    std::size_t found = toUpper(filename).rfind(extension);
    if (found != std::string::npos) {
      g_log.debug() << "matched extension \"" << extension << "\" based on \"" << ext << "\"\n";
      return filename.substr(found); // grab the actual extensions found
    }
  }
 
  g_log.debug() << "Failed to find extension. Just using last \'.\'\n";
  std::size_t pos = filename.find_last_of('.');
  if (pos != std::string::npos) {
    return filename.substr(pos);
  }
 
  // couldn't find an extension
  return "";
}
 
std::vector<IArchiveSearch_sptr> FileFinderImpl::getArchiveSearch(const Kernel::FacilityInfo &facility) {
  std::vector<IArchiveSearch_sptr> archs;
 
  // get the searchive option from config service and format it
  std::string archiveOpt = Kernel::ConfigService::Instance().getString("datasearch.searcharchive");
  std::transform(archiveOpt.begin(), archiveOpt.end(), archiveOpt.begin(), tolower);
 
  // if it is turned off, not specified, or the facility doesn't have
  // IArchiveSearch defined, return an empty vector
  if (archiveOpt.empty() || archiveOpt == "off" || facility.archiveSearch().empty())
    return archs;
 
  // determine if the user wants archive search for this facility
  auto createArchiveSearch = bool(archiveOpt == "all");
 
  // then see if the facility name appears in the list or if we just want the
  // default facility
  if (!createArchiveSearch) {
    std::string faciltyName = facility.name();
    std::transform(faciltyName.begin(), faciltyName.end(), faciltyName.begin(), tolower);
    if (archiveOpt == "on") { // only default facilty
      std::string defaultFacility = Kernel::ConfigService::Instance().getString("default.facility");
      std::transform(defaultFacility.begin(), defaultFacility.end(), defaultFacility.begin(), tolower);
      createArchiveSearch = bool(faciltyName == defaultFacility);
    } else { // everything in the list
      createArchiveSearch = bool(archiveOpt.find(faciltyName) != std::string::npos);
    }
  }
 
  // put together the list of IArchiveSearch to use
  if (createArchiveSearch) {
    for (const auto &facilityname : facility.archiveSearch()) {
      g_log.debug() << "get archive search for the facility..." << facilityname << "\n";
      archs.emplace_back(ArchiveSearchFactory::Instance().create(facilityname));
    }
  }
  return archs;
}
 
const API::Result<std::string> FileFinderImpl::findRun(const std::string &hintstr,
                                                       const std::vector<std::string> &extensionsProvided,
                                                       const bool useOnlyExtensionsProvided) const {
  std::string hint = Kernel::Strings::strip(hintstr);
  g_log.debug() << "vector findRun(\'" << hint << "\', exts[" << extensionsProvided.size() << "])\n";
 
  // if partial filename or run number is not supplied, return here
  if (hint.empty())
    return API::Result<std::string>("", "File not found.");
 
  // if it looks like a full filename just do a quick search for it
  std::filesystem::path hintPath(hint);
  if (hintPath.has_extension()) {
    // check in normal search locations
    g_log.debug() << "hintPath is not empty, check in normal search locations"
                  << "\n";
    std::string path = getFullPath(hint);
    if (!path.empty()) {
      try {
        if (std::filesystem::exists(path)) {
          g_log.information() << "found path = " << path << '\n';
          return API::Result<std::string>(path);
        }
      } catch (const std::exception &) {
      }
    } else {
      g_log.debug() << "Unable to find files via directory search with the "
                       "filename that looks like a full filename"
                    << "\n";
    }
  }
 
  // get instrument and facility
  const Kernel::InstrumentInfo instrument = this->getInstrument(hint);
  const Kernel::FacilityInfo &facility = instrument.facility();
  // get facility extensions
  const std::vector<std::string> facilityExtensions = facility.extensions();
 
  // Do we need to try and form a filename from our preset rules
  std::string filename(hint);
  std::string extension = getExtension(hint, facilityExtensions);
  if (!facilityExtensions.empty())
    filename = hint.substr(0, hint.rfind(extension));
  if (hintPath.parent_path().empty()) {
    try {
      if (!facility.noFilePrefix()) {
        filename = makeFileName(filename, instrument);
      }
    } catch (std::invalid_argument &) {
      if (filename.length() >= hint.length()) {
        g_log.information() << "Could not form filename from standard rules '" << filename << "'\n";
      }
    }
  }
 
  if (filename.empty())
    return API::Result<std::string>("", "File not found");
 
  // Look first at the original filename then for case variations. This is
  // important
  // on platforms where file names ARE case sensitive.
  // Sorry for the duplication, a last minute fix was required. Ticket #6419 is
  // tasked with a redesign of
  // the whole file finding concept.
 
  std::set<std::string> filenames;
  filenames.insert(filename);
  if (!getCaseSensitive()) {
    std::string transformed(filename);
    std::transform(filename.begin(), filename.end(), transformed.begin(), toupper);
    filenames.insert(transformed);
    std::transform(filename.begin(), filename.end(), transformed.begin(), tolower);
    filenames.insert(transformed);
  }
 
  // Merge the extensions & throw out duplicates
  // On Windows throw out ones that only vary in case
  std::vector<std::string> extensionsToSearch;
  extensionsToSearch.reserve(1 + extensionsProvided.size() + facilityExtensions.size());
 
  if (useOnlyExtensionsProvided) {
    getUniqueExtensions(extensionsProvided, extensionsToSearch);
 
  } else {
    if (!extension.empty()) {
      extensionsToSearch.emplace_back(extension);
 
    } else {
      getUniqueExtensions(extensionsProvided, extensionsToSearch);
      getUniqueExtensions(facilityExtensions, extensionsToSearch);
    }
  }
 
  // determine which archive search facilities to use
  std::vector<IArchiveSearch_sptr> archs = getArchiveSearch(facility);
 
  auto path = getPath(archs, filenames, extensionsToSearch);
  if (path) {
    g_log.information() << "Found path = " << path << '\n';
    return path;
  }
  // Path not found
 
  // If only looked for extension in filename
  if (!useOnlyExtensionsProvided && extensionsToSearch.size() == 1) {
 
    extensionsToSearch.pop_back(); // No need to search for missing extension again
    getUniqueExtensions(extensionsProvided, extensionsToSearch);
    getUniqueExtensions(facilityExtensions, extensionsToSearch);
 
    g_log.warning() << "Extension ['" << extension << "'] not found.\n";
    g_log.warning() << "Searching for other facility extensions." << std::endl;
 
    path = getPath(archs, filenames, extensionsToSearch);
    if (path) {
      g_log.information() << "Found path = " << path << '\n';
      return path;
    }
  }
  g_log.information() << "Unable to find run with hint " << hint << "\n";
  return API::Result<std::string>("", path.errors());
}
 
void FileFinderImpl::getUniqueExtensions(const std::vector<std::string> &extensionsToAdd,
                                         std::vector<std::string> &uniqueExts) const {
  const bool isCaseSensitive = getCaseSensitive();
  for (const auto &cit : extensionsToAdd) {
    std::string transformed(cit);
    if (!isCaseSensitive) {
      std::transform(cit.begin(), cit.end(), transformed.begin(), tolower);
    }
    const auto searchItr = std::find(uniqueExts.begin(), uniqueExts.end(), transformed);
    if (searchItr == uniqueExts.end()) {
      uniqueExts.emplace_back(transformed);
    }
  }
}
 
std::string FileFinderImpl::validateRuns(const std::string &searchText) const {
  if (!isASCII(searchText))
    return "An unsupported non-ASCII character was found in the search text.";
  return "";
}
 
std::vector<std::string> FileFinderImpl::findRuns(const std::string &hintstr,
                                                  const std::vector<std::string> &extensionsProvided,
                                                  const bool useOnlyExtensionsProvided) const {
  auto const error = validateRuns(hintstr);
  if (!error.empty())
    throw std::invalid_argument(error);
 
  std::string hint = Kernel::Strings::strip(hintstr);
  g_log.debug() << "findRuns hint = " << hint << "\n";
  std::vector<std::string> res;
  Mantid::Kernel::StringTokenizer hints(
      hint, ",", Mantid::Kernel::StringTokenizer::TOK_TRIM | Mantid::Kernel::StringTokenizer::TOK_IGNORE_EMPTY);
  static const boost::regex digits("[0-9]+");
  auto h = hints.begin();
 
  std::string instrSName;
  for (; h != hints.end(); ++h) {
    // Quick check for a filename
    bool fileSuspected = false;
    // Assume if the hint contains either a "/" or "\" it is a filename..
    if ((*h).find("\\") != std::string::npos) {
      fileSuspected = true;
    }
    if ((*h).find("/") != std::string::npos) {
      fileSuspected = true;
    }
    if ((*h).find(ALLOWED_SUFFIX) != std::string::npos) {
      fileSuspected = true;
    }
 
    Mantid::Kernel::StringTokenizer range(
        *h, "-", Mantid::Kernel::StringTokenizer::TOK_TRIM | Mantid::Kernel::StringTokenizer::TOK_IGNORE_EMPTY);
    if ((range.count() > 2) && (!fileSuspected)) {
      throw std::invalid_argument("Malformed range of runs: " + *h);
    } else if ((range.count() == 2) && (!fileSuspected)) {
      std::pair<std::string, std::string> p1 = toInstrumentAndNumber(range[0]);
      if (boost::algorithm::istarts_with(hint, "PG3")) {
        instrSName = "PG3";
      }
      std::string run = p1.second;
      size_t nZero = run.size(); // zero padding
      if (range[1].size() > nZero) {
        throw std::invalid_argument("Malformed range of runs: " + *h +
                                    ". The end of string value is longer than "
                                    "the instrument's zero padding");
      }
      auto runNumber = boost::lexical_cast<int>(run);
      std::string runEnd = run;
      // Adds zero padding to end of range.
      runEnd.replace(runEnd.end() - range[1].size(), runEnd.end(), range[1]);
 
      // Throw if runEnd contains something else other than a digit.
      if (!boost::regex_match(runEnd, digits))
        throw std::invalid_argument("Malformed range of runs: Part of the run "
                                    "has a non-digit character in it.");
 
      auto runEndNumber = boost::lexical_cast<int>(runEnd);
      if (runEndNumber < runNumber) {
        throw std::invalid_argument("Malformed range of runs: " + *h);
      }
      std::string previousPath, previousExt;
      for (int irun = runNumber; irun <= runEndNumber; ++irun) {
        run = std::to_string(irun);
        while (run.size() < nZero)
          run.insert(0, "0");
 
        // Quick check if file can be created from previous successfully found
        // path/extension
        if (!previousPath.empty() && !previousExt.empty()) {
          try {
            const std::filesystem::path file(previousPath + p1.first + run + previousExt);
            if (std::filesystem::exists(file)) {
              res.emplace_back(file.string());
              continue;
            }
          } catch (...) {
            // Clear cached path and extension
            previousPath = previousExt = "";
          }
        }
 
        std::string path;
        if (boost::algorithm::istarts_with(hint, "PG3")) {
          path = findRun(instrSName + run, extensionsProvided, useOnlyExtensionsProvided).result();
        } else {
          path = findRun(p1.first + run, extensionsProvided, useOnlyExtensionsProvided).result();
        }
 
        if (!path.empty()) {
          // Cache successfully found path and extension
          std::filesystem::path tempPath(path);
          previousExt = tempPath.extension().string();
          // Append separator for string concatenation later
          previousPath = tempPath.parent_path().string() + std::string(1, std::filesystem::path::preferred_separator);
          res.emplace_back(path);
        } else {
          throw Kernel::Exception::NotFoundError("Unable to find file:", std::move(run));
        }
      }
    } else {
      std::string path;
      // Special check for "PG3", to cope with situation like '48314,48316'.
      if (boost::algorithm::istarts_with(hint, "PG3")) {
        if (h == hints.begin()) {
          instrSName = "PG3";
          path = findRun(*h, extensionsProvided, useOnlyExtensionsProvided).result();
        } else {
          path = findRun(instrSName + *h, extensionsProvided, useOnlyExtensionsProvided).result();
        }
      } else {
        path = findRun(*h, extensionsProvided, useOnlyExtensionsProvided).result();
      }
      if (!path.empty()) {
        res.emplace_back(path);
      } else {
        throw Kernel::Exception::NotFoundError("Unable to find file:", *h);
      }
    }
  }
 
  return res;
}
 
const API::Result<std::string>
FileFinderImpl::getISISInstrumentDataCachePath(const std::string &cachePathToSearch,
                                               const std::set<std::string> &filenames,
                                               const std::vector<std::string> &exts) const {
  std::string errors;
  auto dataCache = API::ISISInstrumentDataCache(cachePathToSearch);
 
  for (const auto &filename : filenames) {
 
    std::string parentDirPath;
 
    try {
      parentDirPath = dataCache.getFileParentDirectoryPath(filename);
 
    } catch (const std::invalid_argument &e) {
      errors += "Data cache: " + std::string(e.what());
      return API::Result<std::string>("", errors);
 
    } catch (const Json::Exception &e) {
      errors += "Data cache: Failed parsing to JSON: " + std::string(e.what()) +
                "Error likely due to accessing instrument index file while it was being updated on IDAaaS.";
      return API::Result<std::string>("", errors);
    }
 
    if (!std::filesystem::exists(parentDirPath)) {
      errors += "Data cache: Directory not found: " + parentDirPath;
      return API::Result<std::string>("", errors);
    }
 
    for (const auto &ext : exts) {
      std::filesystem::path filePath(parentDirPath + '/' + filename + ext);
 
      try { // Catches error for permission denied
        if (std::filesystem::exists(filePath)) {
          return API::Result<std::string>(filePath.string());
        }
      } catch (const std::filesystem::filesystem_error &e) {
        errors += "Data cache: " + std::string(e.what());
        return API::Result<std::string>("", errors);
      }
    }
    errors += "Data cache: " + filename + " not found in " + parentDirPath;
  }
  return API::Result<std::string>("", errors);
}
 
const API::Result<std::string> FileFinderImpl::getArchivePath(const std::vector<IArchiveSearch_sptr> &archs,
                                                              const std::set<std::string> &filenames,
                                                              const std::vector<std::string> &exts) const {
  g_log.debug() << "getArchivePath([IArchiveSearch_sptr], [ ";
  for (const auto &iter : filenames)
    g_log.debug() << iter << " ";
  g_log.debug() << "], [ ";
  for (const auto &iter : exts)
    g_log.debug() << iter << " ";
  g_log.debug() << "])\n";
 
  string errors = "";
  for (const auto &arch : archs) {
    try {
      g_log.debug() << "Getting archive path for requested files\n";
      auto path = arch->getArchivePath(filenames, exts);
      if (path)
        return path;
      else
        errors += path.errors();
    } catch (...) {
    }
  }
  return API::Result<std::string>("", errors);
}
 
const API::Result<std::string> FileFinderImpl::getPath(const std::vector<IArchiveSearch_sptr> &archs,
                                                       const std::set<std::string> &filenames,
                                                       const std::vector<std::string> &exts) const {
  std::string path;
 
  std::vector<std::string> extensions;
  extensions.assign(exts.begin(), exts.end());
 
  // Remove wild cards.
  extensions.erase(std::remove_if(extensions.begin(), extensions.end(), containsWildCard), extensions.end());
 
  const std::vector<std::string> &searchPaths = Kernel::ConfigService::Instance().getDataSearchDirs();
 
  // Before we try any globbing, make sure we exhaust all reasonable attempts at
  // constructing the possible filename.
  // Avoiding the globbing of getFullPath() for as long as possible will help
  // performance when calling findRuns()
  // with a large range of files, especially when searchPaths consists of
  // folders containing a large number of runs.
  for (const auto &extension : extensions) {
    for (const auto &filename : filenames) {
      for (const auto &searchPath : searchPaths) {
        try {
          const std::filesystem::path filePath = std::filesystem::path(searchPath) / (filename + extension);
          if (std::filesystem::exists(filePath))
            return API::Result<std::string>(filePath.string());
 
        } catch (const std::exception &) { /* File does not exist, just carry on. */
        }
      }
    }
  }
 
  for (const auto &extension : extensions) {
    for (const auto &filename : filenames) {
      path = getFullPath(filename + extension);
      try {
        if (!path.empty() && std::filesystem::exists(path)) {
          g_log.debug() << "path returned from getFullPath() = " << path << '\n';
          return API::Result<std::string>(path);
        }
      } catch (std::exception &e) {
        g_log.error() << "Cannot open file " << path << ": " << e.what() << '\n';
        return API::Result<std::string>("", "Cannot open file.");
      }
    }
  }
 
  // Search data cache
  string errors;
  std::filesystem::path cachePathToSearch(Kernel::ConfigService::Instance().getString("datacachesearch.directory"));
  // Only expect to find path to data cache on IDAaaS
  if (std::filesystem::exists(cachePathToSearch)) {
 
    API::Result<std::string> cacheFilePath =
        getISISInstrumentDataCachePath(cachePathToSearch.string(), filenames, exts);
 
    if (cacheFilePath) {
      return cacheFilePath;
    }
    errors += cacheFilePath.errors();
 
  } else {
    g_log.debug() << "Data cache directory not found, proceeding with the search." << std::endl;
    errors += "Could not find data cache directory: " + cachePathToSearch.string() + '\n';
  }
 
  // Search the archive
  if (!archs.empty()) {
    g_log.debug() << "Search the archives\n";
    const auto archivePath = getArchivePath(archs, filenames, exts);
    if (archivePath) {
      try {
        if (std::filesystem::exists(archivePath.result()))
          return archivePath;
      } catch (std::exception &e) {
        g_log.error() << "Cannot open file " << archivePath << ": " << e.what() << '\n';
        return API::Result<std::string>("", "Cannot open file.");
      }
    } else
      errors += archivePath.errors();
 
  } // archs
  return API::Result<std::string>("", errors);
}
 
std::string FileFinderImpl::toUpper(const std::string &src) const {
  std::string result = src;
  std::transform(result.begin(), result.end(), result.begin(), toupper);
  return result;
}
 
} // namespace Mantid::API