ConfigService.cpp

    getKeysRecursive(searchString, allKeys);
  }
}

/**
* Recursively gets a list of all config options.
*
* This function is needed as Boost Python does not like calling function with
* default arguments.
*
* @return Vector containing all config options
*/
std::vector<std::string> ConfigServiceImpl::keys() const {
  std::vector<std::string> allKeys;
  getKeysRecursive("", allKeys);
  return allKeys;
}

/** Removes a key from the memory stored properties file and inserts the key
 *into the
 *  changed key list so that when the program calls saveConfig the properties
 *file will
 *  be the same and not contain the key no more
 *
 *  @param rootName :: The key that is to be deleted
 */
void ConfigServiceImpl::remove(const std::string &rootName) const {
  m_pConf->remove(rootName);
  m_changed_keys.insert(rootName);
}

/** Checks to see whether the given key exists.
 *
 *  @param rootName :: The case sensitive key that you are looking to see if
 *exists.
 *  @returns Boolean value denoting whether the exists or not.
 */
bool ConfigServiceImpl::hasProperty(const std::string &rootName) const {
  return m_pConf->hasProperty(rootName);
}

/** Checks to see whether the given file target is an executable one and it
 *exists.
 * This method will expand environment variables found in the given file path.
 *
 *  @param target :: The path to the file you wish to see whether it's an
 *executable.
 *  @returns Boolean value denoting whether the file is an executable or not.
 */
bool ConfigServiceImpl::isExecutable(const std::string &target) const {
  try {
    std::string expTarget = Poco::Path::expand(target);
    Poco::File tempFile = Poco::File(expTarget);

    if (tempFile.exists()) {
      return tempFile.canExecute();
    } else
      return false;
  } catch (Poco::Exception &) {
    return false;
  }
}

/** Runs a command line string to open a program. The function can take program
 *arguments.
 *  i.e it can load in a file to the program on startup.
 *
 *  This method will expand environment variables found in the given file path.
 *
 *  @param programFilePath :: The directory where the program is located.
 *  @param programArguments :: The arguments that the program can take on
 *startup. For example,
 *  the file to load up.
 */

void ConfigServiceImpl::launchProcess(
    const std::string &programFilePath,
    const std::vector<std::string> &programArguments) const {
  try {
    std::string expTarget = Poco::Path::expand(programFilePath);
    Poco::Process::launch(expTarget, programArguments);
  } catch (Poco::SystemException &e) {
    throw std::runtime_error(e.what());
  }
}

/**
 * Set a configuration property. An existing key will have its value updated.
 * @param key :: The key to refer to this property
 * @param value :: The value of the property
 */
void ConfigServiceImpl::setString(const std::string &key,
                                  const std::string &value) {
  // If the value is unchanged (after any path conversions), there's nothing to
  // do.
  const std::string old = getString(key);
  if (value == old)
    return;

  // Ensure we keep a correct full path
  std::map<std::string, bool>::const_iterator itr = m_ConfigPaths.find(key);
  if (itr != m_ConfigPaths.end()) {
    m_AbsolutePaths[key] = makeAbsolute(value, key);
  }

  if (key == "datasearch.directories") {
    cacheDataSearchPaths();
  } else if (key == "usersearch.directories") {
    cacheUserSearchPaths();
  } else if (key == "instrumentDefinition.directory") {
    cacheInstrumentPaths();
  } else if (key == "defaultsave.directory") {
    appendDataSearchDir(value);
  }

  m_pConf->setString(key, value);

  m_notificationCenter.postNotification(new ValueChanged(key, value, old));
  m_changed_keys.insert(key);
}

/** Searches for a string within the currently loaded configuaration values and
 *  attempts to convert the values to the template type supplied.
 *
 *  @param keyName :: The case sensitive name of the property that you need the
 *value of.
 *  @param out ::     The value if found
 *  @returns A success flag - 0 on failure, 1 on success
 */
template <typename T>
int ConfigServiceImpl::getValue(const std::string &keyName, T &out) {
  std::string strValue = getString(keyName);
  int result = Mantid::Kernel::Strings::convert(strValue, out);
  return result;
}

/**
 * Return the full filename of the local properties file.
 * @returns A string containing the full path to the local file.
 */
std::string ConfigServiceImpl::getLocalFilename() const {
#ifdef _WIN32
  return "Mantid.local.properties";
#else
  return "/etc/mantid.local.properties";
#endif
}

/**
 * Return the full filename of the user properties file
 * @returns A string containing the full path to the user file
 */
std::string ConfigServiceImpl::getUserFilename() const {
  return getUserPropertiesDir() + m_user_properties_file_name;
}

/** Searches for the string within the environment variables and returns the
 *  value as a string.
 *
 *  @param keyName :: The name of the environment variable that you need the
 *value of.
 *  @returns The string value of the property
 */
std::string ConfigServiceImpl::getEnvironment(const std::string &keyName) {
  return m_pSysConfig->getString("system.env." + keyName);
}

/** Gets the name of the host operating system
 *
 *  @returns The name pf the OS version
 */
std::string ConfigServiceImpl::getOSName() {
  return m_pSysConfig->getString("system.osName");
}

/** Gets the name of the computer running Mantid
 *
 *  @returns The  name of the computer
 */
std::string ConfigServiceImpl::getOSArchitecture() {
  return m_pSysConfig->getString("system.osArchitecture");
}

/** Gets the name of the operating system Architecture
 *
 * @returns The operating system architecture
 */
std::string ConfigServiceImpl::getComputerName() {
  return m_pSysConfig->getString("system.nodeName");
}

/** Gets the name of the operating system version
 *
 * @returns The operating system version
 */
std::string ConfigServiceImpl::getOSVersion() {
  return m_pSysConfig->getString("system.osVersion");
}

/// @returns true if the file exists and can be read
bool canRead(const std::string &filename) {
  // check for existence of the file
  Poco::File pocoFile(filename);
  if (!pocoFile.exists()) {
    return false;
  }

  // just return if it is readable
  return pocoFile.canRead();
}

/// @returns the value associated with the key.
std::string getValueFromStdOut(const std::string &orig,
                               const std::string &key) {
  size_t start = orig.find(key);
  if (start == std::string::npos) {
    return std::string();
  }
  start += key.size();

  size_t stop = orig.find('\n', start);
  if (stop == std::string::npos) {
    return std::string();
  }

  return Mantid::Kernel::Strings::strip(orig.substr(start, stop - start - 1));
}

/**
 * Gets the name of the operating system version in a human readable form.
 *
 * @returns The operating system desciption
 */
std::string ConfigServiceImpl::getOSVersionReadable() {
  std::string description;

  // read os-release
  static const std::string OS_RELEASE("/etc/os-release");
  if (canRead(OS_RELEASE)) {
    static const std::string PRETTY_NAME("PRETTY_NAME=");

    // open it to see if it has the magic line
    std::ifstream handle(OS_RELEASE.c_str(), std::ios::in);

    // go through the file
    std::string line;
    while (std::getline(handle, line)) {
      if (line.find(PRETTY_NAME) != std::string::npos) {
        if (line.length() > PRETTY_NAME.length() + 1) {
          size_t length = line.length() - PRETTY_NAME.length() - 2;
          description = line.substr(PRETTY_NAME.length() + 1, length);
        }
        break;
      }
    }

    // cleanup
    handle.close();
    if (!description.empty()) {
      return description;
    }
  }

  // read redhat-release
  static const std::string REDHAT_RELEASE("/etc/redhat-release");
  if (canRead(REDHAT_RELEASE)) {
    // open it to see if it has the magic line
    std::ifstream handle(REDHAT_RELEASE.c_str(), std::ios::in);

    // go through the file
    std::string line;
    while (std::getline(handle, line)) {
      if (!line.empty()) {
        description = line;
        break;
      }
    }

    // cleanup
    handle.close();
    if (!description.empty()) {
      return description;
    }
  }

  // try system calls
  std::string cmd;
  std::vector<std::string> args;
#ifdef __APPLE__
  cmd = "sw_vers"; // mac
#elif _WIN32
  cmd = "wmic";                 // windows
  args.emplace_back("os");      // windows
  args.emplace_back("get");     // windows
  args.emplace_back("Caption"); // windows
  args.emplace_back("/value");  // windows
#endif

  if (!cmd.empty()) {
    try {
      Poco::Pipe outPipe, errorPipe;
      Poco::ProcessHandle ph =
          Poco::Process::launch(cmd, args, nullptr, &outPipe, &errorPipe);
      const int rc = ph.wait();
      // Only if the command returned successfully.
      if (rc == 0) {
        Poco::PipeInputStream pipeStream(outPipe);
        std::stringstream stringStream;
        Poco::StreamCopier::copyStream(pipeStream, stringStream);
        const std::string result = stringStream.str();
#ifdef __APPLE__
        const std::string product_name =
            getValueFromStdOut(result, "ProductName:");
        const std::string product_vers =
            getValueFromStdOut(result, "ProductVersion:");

        description = product_name + " " + product_vers;
#elif _WIN32
        description = getValueFromStdOut(result, "Caption=");
#else
        UNUSED_ARG(result); // only used on mac and windows
#endif
      } else {
        std::stringstream messageStream;
        messageStream << "command \"" << cmd << "\" failed with code: " << rc;
        g_log.debug(messageStream.str());
      }
    } catch (Poco::SystemException &e) {
      g_log.debug("command \"" + cmd + "\" failed");
      g_log.debug(e.what());
    }
  }

  return description;
}

/// @returns The name of the current user as reported by the environment.
std::string ConfigServiceImpl::getUsername() {
  std::string username;

  // mac and favorite way to get username on linux
  try {
    username = m_pSysConfig->getString("system.env.USER");
    if (!username.empty()) {
      return username;
    }
  } catch (Poco::NotFoundException &e) {
    UNUSED_ARG(e); // let it drop on the floor
  }

  // windoze and alternate linux username variable
  try {
    username = m_pSysConfig->getString("system.env.USERNAME");
    if (!username.empty()) {
      return username;
    }
  } catch (Poco::NotFoundException &e) {
    UNUSED_ARG(e); // let it drop on the floor
  }

  // give up and return an empty string
  return std::string();
}

/** Gets the absolute path of the current directory containing the dll
 *
 * @returns The absolute path of the current directory containing the dll
 */
std::string ConfigServiceImpl::getCurrentDir() {
  return m_pSysConfig->getString("system.currentDir");
}

/** Gets the absolute path of the current directory containing the dll. Const
 *version.
 *
 * @returns The absolute path of the current directory containing the dll
 */
std::string ConfigServiceImpl::getCurrentDir() const {
  return m_pSysConfig->getString("system.currentDir");
}

/** Gets the absolute path of the temp directory
 *
 * @returns The absolute path of the temp directory
 */
std::string ConfigServiceImpl::getTempDir() {
  return m_pSysConfig->getString("system.tempDir");
}

/** Gets the absolute path of the appdata directory
*
* @returns The absolute path of the appdata directory
*/
std::string ConfigServiceImpl::getAppDataDir() {
  const std::string applicationName = "mantid";
#if POCO_OS == POCO_OS_WINDOWS_NT
  const std::string vendorName = "mantidproject";
  std::string appdata = std::getenv("APPDATA");
  Poco::Path path(appdata);
  path.makeDirectory();
  path.pushDirectory(vendorName);
  path.pushDirectory(applicationName);
  return path.toString();
#else // linux and mac
  Poco::Path path(Poco::Path::home());
  path.pushDirectory("." + applicationName);
  return path.toString();
#endif
}

/**
 * Get the directory containing the program executable
 * @returns A string containing the path of the directory
 * containing the executable, including a trailing slash
 */
std::string ConfigServiceImpl::getDirectoryOfExecutable() const {
  return Poco::Path(getPathToExecutable()).parent().toString();
}

/**
  * Get the full path to the executing program (i.e. whatever Mantid is embedded
 * in)
  * @returns A string containing the full path the the executable
  */
std::string ConfigServiceImpl::getPathToExecutable() const {
  std::string execpath;
  const size_t LEN(1024);
  // cppcheck-suppress variableScope
  char pBuf[LEN];

#ifdef _WIN32
  unsigned int bytes = GetModuleFileName(NULL, pBuf, LEN);
#elif defined __linux__
  char szTmp[32];
  sprintf(szTmp, "/proc/%d/exe", getpid());
  ssize_t bytes = readlink(szTmp, pBuf, LEN);
#elif defined __APPLE__
  // Two calls to _NSGetExecutablePath required - first to get size of buffer
  uint32_t bytes(0);
  _NSGetExecutablePath(pBuf, &bytes);
  const int success = _NSGetExecutablePath(pBuf, &bytes);
  if (success < 0)
    bytes = 1025;
#endif

  if (bytes > 0 && bytes < 1024) {
    pBuf[bytes] = '\0';
    execpath = std::string(pBuf);
  }
  return execpath;
}

/**
 * Check if the path is on a network drive
 * @param path :: The path to be checked
 * @return True if the path is on a network drive.
 */
bool ConfigServiceImpl::isNetworkDrive(const std::string &path) {
#ifdef _WIN32
  // if path is relative get the full one
  char buff[MAX_PATH];
  GetFullPathName(path.c_str(), MAX_PATH, buff, NULL);
  std::string fullName(buff);
  size_t i = fullName.find(':');

  // if the full path doesn't contain a drive letter assume it's on the network
  if (i == std::string::npos)
    return true;

  fullName.erase(i + 1);
  fullName += '\\'; // make sure the name has the trailing backslash
  UINT type = GetDriveType(fullName.c_str());
  return DRIVE_REMOTE == type;
#elif defined __linux__
  // This information is only present in the /proc/mounts file on linux. There
  // are no drives on
  // linux only mount locations therefore the test will have to check the path
  // against
  // entries in /proc/mounts to see if the filesystem type is NFS or SMB (any
  // others ????)
  // Each line corresponds to a particular mounted location
  // 1st column - device name
  // 2nd column - mounted location
  // 3rd column - filesystem type commonly ext2, ext3 for hard drives and NFS or
  // SMB for
  //              network locations

  std::ifstream mntfile("/proc/mounts");
  std::string txtread("");
  while (getline(mntfile, txtread)) {
    std::istringstream strm(txtread);
    std::string devname(""), mntpoint(""), fstype("");
    strm >> devname >> mntpoint >> fstype;
    if (!strm)
      continue;
    // I can't be sure that the file system type is always lower case
    std::transform(fstype.begin(), fstype.end(), fstype.begin(), toupper);
    // Skip the current line if the file system isn't a network one
    if (fstype != "NFS" && fstype != "SMB")
      continue;
    // Now we have a line containing a network filesystem and just need to check
    // if the path
    // supplied contains the mount location. There is a small complication in
    // that the mount
    // points within the file have certain characters transformed into their
    // octal
    // representations, for example spaces->040.
    std::string::size_type idx = mntpoint.find("\\0");
    if (idx != std::string::npos) {
      std::string oct = mntpoint.substr(idx + 1, 3);
      strm.str(oct);
      int printch(-1);
      strm.setf(std::ios::oct, std::ios::basefield);
      strm >> printch;
      if (printch != -1) {
        mntpoint = mntpoint.substr(0, idx) + static_cast<char>(printch) +
                   mntpoint.substr(idx + 4);
      }
      // Search for this at the start of the path
      if (path.find(mntpoint) == 0)
        return true;
    }
  }
  return false;
#else
  UNUSED_ARG(path);
  // Not yet implemented for the mac
  return false;
#endif
}

/**
 * Gets the directory that we consider to be the directory containing the
 * Mantid.properties file.
 * Basically, this is the either the directory pointed to by MANTIDPATH or the
 * directory of the current
 * executable if this is not set.
 * @returns The directory to consider as the base directory, including a
 * trailing slash
 */
std::string ConfigServiceImpl::getPropertiesDir() const { return m_strBaseDir; }

/**
 * Return the directory that Mantid should use for writing any files it needs so
 * that
 * this is kept separated to user saved files. A trailing slash is appended
 * so that filenames can more easily be concatenated with this
 * @return the directory that Mantid should use for writing files
 */
std::string ConfigServiceImpl::getUserPropertiesDir() const {
#ifdef _WIN32
  return m_strBaseDir;
#else
  Poco::Path datadir(m_pSysConfig->getString("system.homeDir"));
  datadir.append(".mantid");
  // Create the directory if it doesn't already exist
  Poco::File(datadir).createDirectory();
  return datadir.toString() + "/";
#endif
}

/**
 * Return the list of search paths
 * @returns A vector of strings containing the defined search directories
 */
const std::vector<std::string> &ConfigServiceImpl::getDataSearchDirs() const {
  return m_DataSearchDirs;
}

/**
 * Set a list of search paths via a vector
 * @param searchDirs :: A list of search directories
 */
void ConfigServiceImpl::setDataSearchDirs(
    const std::vector<std::string> &searchDirs) {
  std::string searchPaths = boost::join(searchDirs, ";");
  setDataSearchDirs(searchPaths);
}

/**
 * Set a list of search paths via a string
 * @param searchDirs :: A string containing a list of search directories
 * separated by a semi colon (;).
 */
void ConfigServiceImpl::setDataSearchDirs(const std::string &searchDirs) {
  setString("datasearch.directories", searchDirs);
}

/**
 *  Appends the passed subdirectory path to the end of each of data
 *  search dirs and adds these new dirs to data search directories
 *  @param subdir :: the subdirectory path to add (relative)
 */
void ConfigServiceImpl::appendDataSearchSubDir(const std::string &subdir) {
  if (subdir.empty())
    return;

  Poco::Path subDirPath;
  try {
    subDirPath = Poco::Path(subdir);
  } catch (Poco::PathSyntaxException &) {
    return;
  }

  if (!subDirPath.isDirectory() || !subDirPath.isRelative()) {
    return;
  }

  auto newDataDirs = m_DataSearchDirs;
  for (const auto &path : m_DataSearchDirs) {
    Poco::Path newDirPath;
    try {
      newDirPath = Poco::Path(path);
      newDirPath.append(subDirPath);
      newDataDirs.push_back(newDirPath.toString());
    } catch (Poco::PathSyntaxException &) {
      continue;
    }
  }

  setDataSearchDirs(newDataDirs);
}

/**
 *  Adds the passed path to the end of the list of data search paths
 *  the path name must be absolute
 *  @param path :: the absolute path to add
 */
void ConfigServiceImpl::appendDataSearchDir(const std::string &path) {
  if (path.empty())
    return;

  Poco::Path dirPath;
  try {
    dirPath = Poco::Path(path);
    dirPath.makeDirectory();
  } catch (Poco::PathSyntaxException &) {
    return;
  }
  if (!isInDataSearchList(dirPath.toString())) {
    std::string newSearchString;
    std::vector<std::string>::const_iterator it = m_DataSearchDirs.begin();
    for (; it != m_DataSearchDirs.end(); ++it) {
      newSearchString.append(*it);
      newSearchString.append(";");
    }
    newSearchString.append(path);
    setString("datasearch.directories", newSearchString);
  }
}

/**
 * Return the list of user search paths
 * @returns A vector of strings containing the defined search directories
 */
const std::vector<std::string> &ConfigServiceImpl::getUserSearchDirs() const {
  return m_UserSearchDirs;
}

/**
* Sets the search directories for XML instrument definition files (IDFs)
* @param directories An ordered list of paths for instrument searching
*/
void ConfigServiceImpl::setInstrumentDirectories(
    const std::vector<std::string> &directories) {
  m_InstrumentDirs = directories;
}

/**
 * Return the search directories for XML instrument definition files (IDFs)
 * @returns An ordered list of paths for instrument searching
 */
const std::vector<std::string> &
ConfigServiceImpl::getInstrumentDirectories() const {
  return m_InstrumentDirs;
}

/**
 * Return the base search directories for XML instrument definition files (IDFs)
 * @returns a last entry of getInstrumentDirectories
 */
const std::string ConfigServiceImpl::getInstrumentDirectory() const {
  return m_InstrumentDirs.back();
}
/**
 * Return the search directory for vtp files
 * @returns a path
 */
const std::string ConfigServiceImpl::getVTPFileDirectory() {
  // Determine the search directory for XML instrument definition files (IDFs)
  std::string directoryName = getString("instrumentDefinition.vtpDirectory");

  if (directoryName.empty()) {
    Poco::Path path(getAppDataDir());
    path.makeDirectory();
    path.pushDirectory("instrument");
    path.pushDirectory("geometryCache");
    directoryName = path.toString();
  }
  return directoryName;
}
/**
 * Fills the internal cache of instrument definition directories and creates
 * The %appdata%/mantidproject/mantid or $home/.mantid directory.
 *
 * This will normally contain from Index 0
 * - The download directory (win %appdata%/mantidproject/mantid/instrument)
 *   (linux $home/.mantid/instrument )
 * - The user instrument area /etc/mantid/instrument (not on windows)
 * - The install directory/instrument
 */
void ConfigServiceImpl::cacheInstrumentPaths() {
  m_InstrumentDirs.clear();

  Poco::Path path(getAppDataDir());
  path.makeDirectory();
  path.pushDirectory("instrument");
  const std::string appdatadir = path.toString();
  addDirectoryifExists(appdatadir, m_InstrumentDirs);

#ifndef _WIN32
  addDirectoryifExists("/etc/mantid/instrument", m_InstrumentDirs);
#endif

  // Determine the search directory for XML instrument definition files (IDFs)
  std::string directoryName = getString("instrumentDefinition.directory");
  if (directoryName.empty()) {
    // This is the assumed deployment directory for IDFs, where we need to be
    // relative to the
    // directory of the executable, not the current working directory.
    directoryName =
        Poco::Path(getPropertiesDir()).resolve("../instrument").toString();
  }
  addDirectoryifExists(directoryName, m_InstrumentDirs);
}

/**
 * Verifies the directory exists and add it to the back of the directory list if
 * valid
 * @param directoryName the directory name to add
 * @param directoryList the list to add the directory to
 * @returns true if the directory was valid and added to the list
 */
bool ConfigServiceImpl::addDirectoryifExists(
    const std::string &directoryName, std::vector<std::string> &directoryList) {
  try {
    if (Poco::File(directoryName).isDirectory()) {
      directoryList.push_back(directoryName);
      return true;
    } else {
      g_log.information("Unable to locate directory at: " + directoryName);
      return false;
    }
  } catch (Poco::PathNotFoundException &) {
    g_log.information("Unable to locate directory at: " + directoryName);
    return false;
  } catch (Poco::FileNotFoundException &) {
    g_log.information("Unable to locate directory at: " + directoryName);
    return false;
  }
}

std::string ConfigServiceImpl::getFacilityFilename(const std::string &fName) {
  // first try the supplied file
  if (!fName.empty()) {
    const Poco::File fileObj(fName);
    if (fileObj.exists()) {
      return fName;
    }
  }

  // search all of the instrument directories
  const std::vector<std::string> directoryNames = getInstrumentDirectories();

  // only use downloaded instruments if configured to download
  const std::string updateInstrStr =
      this->getString("UpdateInstrumentDefinitions.OnStartup");

  auto instrDir = directoryNames.begin();

  // If we are not updating the instrument definitions
  // update the iterator, this means we will skip the folder in HOME and
  // look in the instrument folder in mantid install directory or mantid source
  // code directory
  if (updateInstrStr != "1" || updateInstrStr != "on" ||
      updateInstrStr != "On") {
    instrDir++;
  }

  // look through all the possible files
  for (; instrDir != directoryNames.end(); ++instrDir) {
    std::string filename = (*instrDir) + "Facilities.xml";

    Poco::File fileObj(filename);
    // stop when you find the first one
    if (fileObj.exists())
      return filename;
  }

  // getting this far means the file was not found
  std::string directoryNamesList = boost::algorithm::join(directoryNames, ", ");
  throw std::runtime_error("Failed to find \"Facilities.xml\". Searched in " +
                           directoryNamesList);
}

/**
 * Load facility information from instrumentDir/Facilities.xml file if fName
 * parameter is not set.
 *
 * If any of the steps fail, we cannot sensibly recover, because the
 * Facilities.xml file is missing or corrupted.
 *
 * @param fName :: An alternative file name for loading facilities information.
 * @throws std::runtime_error :: If the file is not found or fails to parse
 */
void ConfigServiceImpl::updateFacilities(const std::string &fName) {
  clearFacilities();

  // Try to find the file. If it does not exist we will crash, and cannot read
  // the Facilities file
  std::string fileName = getFacilityFilename(fName);

  // Set up the DOM parser and parse xml file
  Poco::AutoPtr<Poco::XML::Document> pDoc;
  try {
    Poco::XML::DOMParser pParser;
    pDoc = pParser.parse(fileName);
  } catch (...) {
    throw Kernel::Exception::FileError("Unable to parse file:", fileName);
  }

  // Get pointer to root element
  Poco::XML::Element *pRootElem = pDoc->documentElement();
  if (!pRootElem->hasChildNodes()) {
    throw std::runtime_error("No root element in Facilities.xml file");
  }

  Poco::AutoPtr<Poco::XML::NodeList> pNL_facility =
      pRootElem->getElementsByTagName("facility");
  size_t n = pNL_facility->length();

  for (unsigned long i = 0; i < n; ++i) {
    Poco::XML::Element *elem =
        dynamic_cast<Poco::XML::Element *>(pNL_facility->item(i));
    if (elem) {
      m_facilities.push_back(new FacilityInfo(elem));
    }
  }

  if (m_facilities.empty()) {
    throw std::runtime_error("The facility definition file " + fileName +
                             " defines no facilities");
  }
}

/// Empty the list of facilities, deleting the FacilityInfo objects in the
/// process
void ConfigServiceImpl::clearFacilities() {
  for (auto &facility : m_facilities) {
    delete facility;
  }
  m_facilities.clear();
}

/**
 * Returns instruments with given name
 * @param  instrumentName Instrument name
 * @return the instrument information object
 * @throw NotFoundError if iName was not found
 */
const InstrumentInfo &
ConfigServiceImpl::getInstrument(const std::string &instrumentName) const {

  // Let's first search for the instrument in our default facility
  std::string defaultFacility = ConfigService::Instance().getFacility().name();

  if (!defaultFacility.empty()) {
    try {
      g_log.debug() << "Looking for " << instrumentName << " at "
                    << defaultFacility << ".\n";
      return getFacility(defaultFacility).instrument(instrumentName);
    } catch (Exception::NotFoundError &) {
      // Well the instName doesn't exist for this facility
      // Move along, there's nothing to see here...
    }
  }

  // Now let's look through the other facilities
  for (auto facility : m_facilities) {
    try {
      g_log.debug() << "Looking for " << instrumentName << " at "
                    << (*facility).name() << ".\n";
      return (*facility).instrument(instrumentName);
    } catch (Exception::NotFoundError &) {
      // Well the instName doesn't exist for this facility...
      // Move along, there's nothing to see here...
    }
  }

  const std::string errMsg =
      "Failed to find an instrument with this name in any facility: '" +
      instrumentName + "' -";
  g_log.debug("Instrument " + instrumentName + " not found");
  throw Exception::NotFoundError(errMsg, instrumentName);
}

/** Gets a vector of the facility Information objects
 * @return A vector of FacilityInfo objects
 */
const std::vector<FacilityInfo *> ConfigServiceImpl::getFacilities() const {
  return m_facilities;
}

/** Gets a vector of the facility names
 * @return A vector of the facility Names
 */
const std::vector<std::string> ConfigServiceImpl::getFacilityNames() const {
  auto names = std::vector<std::string>(m_facilities.size());
  auto itFacilities = m_facilities.begin();
  auto itNames = names.begin();
  for (; itFacilities != m_facilities.end(); ++itFacilities, ++itNames) {
    *itNames = (**itFacilities).name();
  }
  return names;
}

/** Get the default facility
 * @return the facility information object
 */
const FacilityInfo &ConfigServiceImpl::getFacility() const {
  std::string defFacility = getString("default.facility");
  if (defFacility.empty()) {
    defFacility = "ISIS";
  }
  return this->getFacility(defFacility);
}

/**
 * Get a facility
 * @param facilityName :: Facility name
 * @return the facility information object
 * @throw NotFoundException if the facility is not found
 */
const FacilityInfo &
ConfigServiceImpl::getFacility(const std::string &facilityName) const {
  if (facilityName.empty())
    return this->getFacility();

  for (auto facility : m_facilities) {
    if ((*facility).name() == facilityName) {
      return *facility;
    }
  }

  throw Exception::NotFoundError("Facilities", facilityName);
}

/**
 * Set the default facility
 * @param facilityName the facility name
 * @throw NotFoundException if the facility is not found
 */
void ConfigServiceImpl::setFacility(const std::string &facilityName) {
  bool found = false;
  // Look through the facilities for a matching one.
  std::vector<FacilityInfo *>::const_iterator it = m_facilities.begin();
  for (; it != m_facilities.end(); ++it) {
    if ((**it).name() == facilityName) {
      // Found the facility
      found = true;
      // So it's safe to set it as our default
      setString("default.facility", facilityName);
    }
  }
  if (!found) {
    g_log.error("Failed to set default facility to be " + facilityName +
                ". Facility not found");
    throw Exception::NotFoundError("Facilities", facilityName);
  }
}

/**  Add an observer to a notification
 @param observer :: Reference to the observer to add
 */
void ConfigServiceImpl::addObserver(
    const Poco::AbstractObserver &observer) const {
  m_notificationCenter.addObserver(observer);
}

/**  Remove an observer
 @param observer :: Reference to the observer to remove
 */
void ConfigServiceImpl::removeObserver(
    const Poco::AbstractObserver &observer) const {
  m_notificationCenter.removeObserver(observer);
}

/*
Checks to see whether the pvplugins.directory variable is set. If it is set,
assume