LoadPreNexusMonitors.cpp

// 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 +
#include "MantidDataHandling/LoadPreNexusMonitors.h"

#include "MantidAPI/Axis.h"
#include "MantidAPI/FileProperty.h"
#include "MantidAPI/MatrixWorkspace.h"
#include "MantidAPI/WorkspaceFactory.h"
#include "MantidKernel/BinaryFile.h"
#include "MantidKernel/ConfigService.h"
#include "MantidKernel/UnitFactory.h"

#include <boost/lexical_cast.hpp>
#include <memory>

#include <Poco/DOM/AutoPtr.h>
#include <Poco/DOM/DOMParser.h>
#include <Poco/DOM/Document.h>
#include <Poco/DOM/Element.h>
#include <Poco/DOM/NodeFilter.h>
#include <Poco/DOM/NodeIterator.h>
#include <Poco/DOM/NodeList.h>
#include <Poco/Path.h>
#include <Poco/SAX/InputSource.h>

#include <cmath>
#include <cstdlib>
#include <fstream>
#include <iterator>

using Mantid::HistogramData::BinEdges;
using Mantid::HistogramData::Counts;

namespace Mantid::DataHandling {

// Register the algorithm into the AlgorithmFactory
DECLARE_ALGORITHM(LoadPreNexusMonitors)

using namespace Mantid::Kernel;
using namespace Mantid::API;

// Some constants for property names
static const std::string RUNINFO_FILENAME("RunInfoFilename");
static const std::string WORKSPACE_OUT("OutputWorkspace");

// A reference to the logger is provided by the base class, it is called g_log.
// It is used to print out information, warning and error messages

LoadPreNexusMonitors::LoadPreNexusMonitors()
    : Mantid::API::Algorithm(), nMonitors(0), instrument_loaded_correctly(false) {}

void LoadPreNexusMonitors::init() {
  // Filename for the runinfo file.
  declareProperty(std::make_unique<FileProperty>(RUNINFO_FILENAME, "", FileProperty::Load, "_runinfo.xml"),
                  "The filename of the runinfo file for a particular run. "
                  "Allowed Values are: _runinfo.xml");

  // The output workspace
  declareProperty(std::make_unique<WorkspaceProperty<MatrixWorkspace>>(WORKSPACE_OUT, "", Direction::Output),
                  "The workspace to load the monitors into.");

  // Make sure things are initialised.
  nMonitors = 0;
}

void LoadPreNexusMonitors::exec() {
  // time of flight channel parameters
  double tmin = 0.0;
  double tstep = 0.0;
  int tchannels = 0;
  std::string instrumentName;

  // Vectors to store monitor parameters
  std::vector<std::string> monitorFilenames;
  std::vector<int> monitorIDs;

  // Get the Runinfo filename from the property
  std::string runinfo_filename = this->getPropertyValue(RUNINFO_FILENAME);

  // TODO: Extract the directory that the runinfo file is in.
  // Create a Poco Path object for runinfo filename
  Poco::Path runinfoPath(runinfo_filename, Poco::Path::PATH_GUESS);
  // Now lets get the directory
  Poco::Path dirPath(runinfoPath.parent());

  this->g_log.information("Monitor File Dir: " + dirPath.toString());

  // Some XML parsing magic...
  std::ifstream in(runinfo_filename.c_str());
  Poco::XML::InputSource src(in);

  Poco::XML::DOMParser parser;
  Poco::AutoPtr<Poco::XML::Document> pDoc = parser.parse(&src);

  Poco::XML::NodeIterator it(pDoc, Poco::XML::NodeFilter::SHOW_ELEMENT);
  Poco::XML::Node *pNode = it.nextNode();
  while (pNode) {

    // Get the beamline name.
    if (pNode->nodeName() == "RunInfo") {
      auto *pRunInfoElement = static_cast<Poco::XML::Element *>(pNode);
      instrumentName = pRunInfoElement->getAttribute("instrument");
    }

    // Look for the section that contains the binning parameters.
    // This will end up with using the binning for the last monitor that is
    // found
    // TODO: Modify to store (and use) the TCBs for each monitor separately.
    if (pNode->nodeName() == "BeamMonitorInfo") {
      // Increment the number of monitors we've found
      ++nMonitors;

      auto *pE = static_cast<Poco::XML::Element *>(pNode);
      g_log.debug() << "Beam Monitor " << pE->getAttribute("id") << '\n';
      g_log.debug() << "\tname: " << pE->getAttribute("name") << '\n';
      g_log.debug() << "\tdescription: " << pE->getAttribute("description") << '\n';

      // Now lets get the tof binning settings
      Poco::XML::Element *pTimeChannels = pE->getChildElement("NumTimeChannels");
      tmin = boost::lexical_cast<double>(pTimeChannels->getAttribute("startbin"));
      tstep = boost::lexical_cast<double>(pTimeChannels->getAttribute("width"));
    }

    // Look for the 'DataList' node to get the monitor dims.
    // TODO: Again we will only use the mast monitor value.
    if (pNode->nodeName() == "DataList") {
      // Get a list of the child elements
      Poco::AutoPtr<Poco::XML::NodeList> pDataListChildren = pNode->childNodes();
      for (unsigned long i = 0; i < pDataListChildren->length(); ++i) {
        // We only care about monitors
        if (pDataListChildren->item(i)->nodeName() == "monitor") {
          auto *element = static_cast<Poco::XML::Element *>(pDataListChildren->item(i));
          monitorIDs.emplace_back(boost::lexical_cast<int>(element->getAttribute("id")));
          monitorFilenames.emplace_back(element->getAttribute("name"));
        }
      }
    }

    // Get the size of the files
    if (pNode->nodeName() == "FileFormats") {
      // Get a list of the child elements
      Poco::AutoPtr<Poco::XML::NodeList> pDataListChildren = pNode->childNodes();
      for (unsigned long i = 0; i < pDataListChildren->length(); ++i) {
        // We only care about monitors
        if (pDataListChildren->item(i)->nodeName() == "monitor") {
          std::string dims = static_cast<Poco::XML::Element *>(pDataListChildren->item(i))->getAttribute("dims");
          tchannels = boost::lexical_cast<int>(dims);
        }
      }
    }

    pNode = it.nextNode();
  }

  g_log.information() << "Found " << nMonitors << " beam monitors.\n";

  g_log.information() << "Number of Time Channels = " << tchannels << '\n';

  // Now lets create the time of flight array.
  const int numberTimeBins = tchannels + 1;
  MantidVec time_bins(numberTimeBins);
  for (int i = 0; i < numberTimeBins; ++i) {
    time_bins[i] = tmin + (i)*tstep;
  }

  // Create the new workspace
  MatrixWorkspace_sptr localWorkspace =
      WorkspaceFactory::Instance().create("Workspace2D", nMonitors, numberTimeBins, tchannels);

  BinEdges edges(time_bins);
  for (int i = 0; i < nMonitors; i++) {
    // Now lets actually read the monitor files..
    Poco::Path pMonitorFilename(dirPath, monitorFilenames[i]);

    g_log.debug() << "Loading monitor file :" << pMonitorFilename.toString() << '\n';

    Kernel::BinaryFile<uint32_t> monitorFile(pMonitorFilename.toString());
    // temp buffer for file reading
    std::vector<uint32_t> buffer = monitorFile.loadAllIntoVector();

    localWorkspace->setHistogram(i, edges, Counts(buffer.begin(), buffer.end()));

    // Just have spectrum number be the same as the monitor number but -ve.
    auto &spectrum = localWorkspace->getSpectrum(i);
    spectrum.setSpectrumNo(monitorIDs[i]);
    spectrum.setDetectorID(-monitorIDs[i]);
  }

  g_log.debug() << "Setting axis zero to TOF\n";

  // Set the units
  localWorkspace->getAxis(0)->unit() = UnitFactory::Instance().create("TOF");
  localWorkspace->setYUnit("Counts");
  // TODO localWorkspace->setTitle(title);

  // Actually load the instrument
  this->runLoadInstrument(instrumentName, localWorkspace);

  // Set the property
  setProperty("OutputWorkspace", localWorkspace);
}

//-----------------------------------------------------------------------------
/** Load the instrument geometry File
 *  @param instrument :: instrument name.
 *  @param localWorkspace :: MatrixWorkspace in which to put the instrument
 * geometry
 */
void LoadPreNexusMonitors::runLoadInstrument(const std::string &instrument,
                                             const MatrixWorkspace_sptr &localWorkspace) {

  auto loadInst = createChildAlgorithm("LoadInstrument");

  // Now execute the Child Algorithm. Catch and log any error, but don't stop.
  bool executionSuccessful(true);
  try {
    loadInst->setPropertyValue("InstrumentName", instrument);
    loadInst->setProperty<MatrixWorkspace_sptr>("Workspace", localWorkspace);
    loadInst->setProperty("RewriteSpectraMap",
                          false); // We have a custom mapping
    loadInst->execute();

    // Populate the instrument parameters in this workspace - this works around
    // a bug
    localWorkspace->populateInstrumentParameters();
  } catch (std::invalid_argument &e) {
    g_log.information() << "Invalid argument to LoadInstrument Child Algorithm : " << e.what() << '\n';
    executionSuccessful = false;
  } catch (std::runtime_error &e) {
    g_log.information() << "Unable to successfully run LoadInstrument Child Algorithm : " << e.what() << '\n';
    executionSuccessful = false;
  }

  // If loading instrument definition file fails
  if (!executionSuccessful) {
    g_log.error() << "Error loading Instrument definition file\n";
  } else {
    this->instrument_loaded_correctly = true;
  }
}

} // namespace Mantid::DataHandling