Merge pull request #763 from mantidproject/feature/10855_rewrite_indi…

…rect_diffraction_reduction

New ISIS indirect diffraction reduction algorithm

Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/ISISIndirectDiffractionReduction.py

@@ -0,0 +1,212 @@
+#pylint: disable=no-init,too-many-instance-attributes
+
+from mantid.simpleapi import *
+from mantid.api import *
+from mantid.kernel import *
+from mantid import config
+
+import os
+
+
+class ISISIndirectDiffractionReduction(DataProcessorAlgorithm):
+
+    _workspace_names = None
+    _chopped_data = None
+    _output_ws = None
+    _data_files = None
+    _instrument_name = None
+    _mode = None
+    _spectra_range = None
+    _grouping_method = None
+    _rebin_string = None
+    _ipf_filename = None
+    _sum_files = None
+
+
+    def category(self):
+        return 'Diffraction;PythonAlgorithms'
+
+
+    def summary(self):
+        return 'Performs a diffraction reduction for a set of raw run files for an ISIS indirect spectrometer'
+
+
+    def PyInit(self):
+        self.declareProperty(StringArrayProperty(name='InputFiles'),
+                             doc='Comma separated list of input files.')
+
+        self.declareProperty(name='SumFiles', defaultValue=False,
+                             doc='Enabled to sum spectra from each input file.')
+
+        self.declareProperty(name='Instrument', defaultValue='IRIS',
+                             validator=StringListValidator(['IRIS', 'OSIRIS', 'TOSCA', 'VESUVIO']),
+                             doc='Instrument used for run')
+
+        self.declareProperty(name='Mode', defaultValue='diffspec',
+                             validator=StringListValidator(['diffspec', 'diffonly']),
+                             doc='Diffraction mode used')
+
+        self.declareProperty(IntArrayProperty(name='SpectraRange'),
+                             doc='Range of spectra to use.')
+
+        self.declareProperty(name='RebinParam', defaultValue='',
+                             doc='Rebin parameters.')
+
+        self.declareProperty(name='GroupingPolicy', defaultValue='All',
+                             validator=StringListValidator(['All', 'Individual', 'IPF']),
+                             doc='Selects the type of detector grouping to be used.')
+
+        self.declareProperty(WorkspaceGroupProperty('OutputWorkspace', '',
+                             direction=Direction.Output),
+                             doc='Group name for the result workspaces.')
+
+
+    def validateInputs(self):
+        """
+        Checks for issues with user input.
+        """
+        issues = dict()
+
+        # Validate input files
+        input_files = self.getProperty('InputFiles').value
+        if len(input_files) == 0:
+            issues['InputFiles'] = 'InputFiles must contain at least one filename'
+
+        # Validate detector range
+        detector_range = self.getProperty('SpectraRange').value
+        if len(detector_range) != 2:
+            issues['SpectraRange'] = 'SpectraRange must be an array of 2 values only'
+        else:
+            if detector_range[0] > detector_range[1]:
+                issues['SpectraRange'] = 'SpectraRange must be in format [lower_index,upper_index]'
+
+        return issues
+
+
+    def PyExec(self):
+        from IndirectReductionCommon import (load_files,
+                                             get_multi_frame_rebin,
+                                             identify_bad_detectors,
+                                             unwrap_monitor,
+                                             process_monitor_efficiency,
+                                             scale_monitor,
+                                             scale_detectors,
+                                             rebin_reduction,
+                                             group_spectra,
+                                             fold_chopped,
+                                             rename_reduction)
+
+        self._setup()
+
+        load_opts = dict()
+        if self._instrument_name == 'VESUVIO':
+            load_opts['Mode'] = 'FoilOut'
+
+        self._workspace_names, self._chopped_data = load_files(self._data_files,
+                                                              self._ipf_filename,
+                                                              self._spectra_range[0],
+                                                              self._spectra_range[1],
+                                                              self._sum_files,
+                                                              load_opts)
+
+        for c_ws_name in self._workspace_names:
+            is_multi_frame = isinstance(mtd[c_ws_name], WorkspaceGroup)
+
+            # Get list of workspaces
+            if is_multi_frame:
+                workspaces = mtd[c_ws_name].getNames()
+            else:
+                workspaces = [c_ws_name]
+
+            # Process rebinning for framed data
+            rebin_string_2, num_bins = get_multi_frame_rebin(c_ws_name,
+                                                             self._rebin_string)
+
+            masked_detectors = identify_bad_detectors(workspaces[0])
+
+            # Process workspaces
+            for ws_name in workspaces:
+                monitor_ws_name = ws_name + '_mon'
+
+                # Process monitor
+                if not unwrap_monitor(ws_name):
+                    ConvertUnits(InputWorkspace=monitor_ws_name,
+                                 OutputWorkspace=monitor_ws_name,
+                                 Target='Wavelength',
+                                 EMode='Elastic')
+
+                process_monitor_efficiency(ws_name)
+                scale_monitor(ws_name)
+
+                # Scale detector data by monitor intensities
+                scale_detectors(ws_name, 'Elastic')
+
+                # Remove the no longer needed monitor workspace
+                DeleteWorkspace(monitor_ws_name)
+
+                # Convert to dSpacing
+                ConvertUnits(InputWorkspace=ws_name,
+                             OutputWorkspace=ws_name,
+                             Target='dSpacing',
+                             EMode='Elastic')
+
+                # Handle rebinning
+                rebin_reduction(ws_name,
+                                self._rebin_string,
+                                rebin_string_2,
+                                num_bins)
+
+                # Group spectra
+                group_spectra(ws_name,
+                              masked_detectors,
+                              self._grouping_method)
+
+            if is_multi_frame:
+                fold_chopped(c_ws_name)
+
+        # Rename output workspaces
+        output_workspace_names = [rename_reduction(ws_name, self._sum_files) for ws_name in self._workspace_names]
+
+        # Group result workspaces
+        GroupWorkspaces(InputWorkspaces=output_workspace_names,
+                        OutputWorkspace=self._output_ws)
+
+        self.setProperty('OutputWorkspace', self._output_ws)
+
+
+    def _setup(self):
+        """
+        Gets algorithm properties.
+        """
+
+        self._output_ws = self.getPropertyValue('OutputWorkspace')
+        self._data_files = self.getProperty('InputFiles').value
+        self._instrument_name = self.getPropertyValue('Instrument')
+        self._mode = self.getPropertyValue('Mode')
+        self._spectra_range = self.getProperty('SpectraRange').value
+        self._rebin_string = self.getPropertyValue('RebinParam')
+        self._grouping_method = self.getPropertyValue('GroupingPolicy')
+
+        if self._rebin_string == '':
+            self._rebin_string = None
+
+        # Get the IPF filename
+        self._ipf_filename = self._instrument_name + '_diffraction_' + self._mode + '_Parameters.xml'
+        if not os.path.exists(self._ipf_filename):
+            self._ipf_filename = os.path.join(config['instrumentDefinition.directory'], self._ipf_filename)
+        logger.information('IPF filename is: %s' % (self._ipf_filename))
+
+        # Only enable sum files if we actually have more than one file
+        sum_files = self.getProperty('SumFiles').value
+        self._sum_files = False
+
+        if sum_files:
+            num_raw_files = len(self._data_files)
+            if num_raw_files > 1:
+                self._sum_files = True
+                logger.information('Summing files enabled (have %d files)' % num_raw_files)
+            else:
+                logger.information('SumFiles options is ignored when only one file is provided')
+
+
+AlgorithmFactory.subscribe(ISISIndirectDiffractionReduction)