| 1 | """ |
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| 2 | NXcanSAS 1/2D data reader for writing HDF5 formatted NXcanSAS files. |
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| 3 | """ |
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| 4 | |
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| 5 | import h5py |
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| 6 | import numpy as np |
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| 7 | import re |
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| 8 | import os |
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| 9 | |
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| 10 | from sas.sascalc.dataloader.readers.cansas_reader_HDF5 import Reader |
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| 11 | from sas.sascalc.dataloader.data_info import Data1D, Data2D |
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| 12 | |
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| 13 | class NXcanSASWriter(Reader): |
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| 14 | """ |
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| 15 | A class for writing in NXcanSAS data files. Any number of data sets may be |
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| 16 | written to the file. Currently 1D and 2D SAS data sets are supported |
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| 17 | |
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| 18 | NXcanSAS spec: http://download.nexusformat.org/sphinx/classes/contributed_definitions/NXcanSAS.html |
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| 19 | |
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| 20 | :Dependencies: |
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| 21 | The NXcanSAS writer requires h5py => v2.5.0 or later. |
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| 22 | """ |
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| 23 | |
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| 24 | def write(self, dataset, filename): |
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| 25 | """ |
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| 26 | Write an array of Data1d or Data2D objects to an NXcanSAS file, as |
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| 27 | one SASEntry with multiple SASData elements. The metadata of the first |
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| 28 | elememt in the array will be written as the SASentry metadata |
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| 29 | (detector, instrument, sample, etc). |
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| 30 | |
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| 31 | :param dataset: A list of Data1D or Data2D objects to write |
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| 32 | :param filename: Where to write the NXcanSAS file |
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| 33 | """ |
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| 34 | |
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| 35 | def _h5_string(string): |
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| 36 | """ |
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| 37 | Convert a string to a numpy string in a numpy array. This way it is |
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| 38 | written to the HDF5 file as a fixed length ASCII string and is |
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| 39 | compatible with the Reader read() method. |
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| 40 | """ |
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| 41 | if isinstance(string, np.ndarray): |
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| 42 | return string |
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| 43 | elif not isinstance(string, str): |
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| 44 | string = str(string) |
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| 45 | |
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| 46 | return np.array([np.string_(string)]) |
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| 47 | |
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| 48 | def _write_h5_string(entry, value, key): |
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| 49 | entry[key] = _h5_string(value) |
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| 50 | |
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| 51 | def _h5_float(x): |
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| 52 | if not (isinstance(x, list)): |
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| 53 | x = [x] |
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| 54 | return np.array(x, dtype=np.float32) |
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| 55 | |
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| 56 | def _write_h5_float(entry, value, key): |
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| 57 | entry.create_dataset(key, data=_h5_float(value)) |
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| 58 | |
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| 59 | def _write_h5_vector(entry, vector, names=['x_position', 'y_position'], |
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| 60 | units=None, write_fn=_write_h5_string): |
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| 61 | """ |
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| 62 | Write a vector to an h5 entry |
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| 63 | |
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| 64 | :param entry: The H5Py entry to write to |
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| 65 | :param vector: The Vector to write |
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| 66 | :param names: What to call the x,y and z components of the vector |
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| 67 | when writing to the H5Py entry |
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| 68 | :param units: The units of the vector (optional) |
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| 69 | :param write_fn: A function to convert the value to the required |
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| 70 | format and write it to the H5Py entry, of the form |
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| 71 | f(entry, value, name) (optional) |
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| 72 | """ |
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| 73 | if len(names) < 2: |
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| 74 | raise ValueError("Length of names must be >= 2.") |
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| 75 | |
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| 76 | if vector.x is not None: |
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| 77 | write_fn(entry, vector.x, names[0]) |
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| 78 | if units is not None: |
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| 79 | entry[names[0]].attrs['units'] = units |
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| 80 | if vector.y is not None: |
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| 81 | write_fn(entry, vector.y, names[1]) |
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| 82 | if units is not None: |
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| 83 | entry[names[1]].attrs['units'] = units |
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| 84 | if len(names) == 3 and vector.z is not None: |
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| 85 | write_fn(entry, vector.z, names[2]) |
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| 86 | if units is not None: |
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| 87 | entry[names[2]].attrs['units'] = units |
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| 88 | |
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| 89 | valid_data = all([issubclass(d.__class__, (Data1D, Data2D)) for d in |
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| 90 | dataset]) |
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| 91 | if not valid_data: |
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| 92 | raise ValueError("All entries of dataset must be Data1D or Data2D" |
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| 93 | "objects") |
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| 94 | |
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| 95 | # Get run name and number from first Data object |
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| 96 | data_info = dataset[0] |
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| 97 | run_number = '' |
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| 98 | run_name = '' |
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| 99 | if len(data_info.run) > 0: |
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| 100 | run_number = data_info.run[0] |
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| 101 | if len(data_info.run_name) > 0: |
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| 102 | run_name = data_info.run_name[run_number] |
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| 103 | |
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| 104 | f = h5py.File(filename, 'w') |
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| 105 | sasentry = f.create_group('sasentry01') |
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| 106 | sasentry['definition'] = _h5_string('NXcanSAS') |
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| 107 | sasentry['run'] = _h5_string(run_number) |
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| 108 | sasentry['run'].attrs['name'] = run_name |
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| 109 | sasentry['title'] = _h5_string(data_info.title) |
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| 110 | sasentry.attrs['canSAS_class'] = 'SASentry' |
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| 111 | sasentry.attrs['version'] = '1.0' |
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| 112 | |
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| 113 | for i, data_obj in enumerate(dataset): |
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| 114 | data_entry = sasentry.create_group("sasdata{0:0=2d}".format(i+1)) |
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| 115 | data_entry.attrs['canSAS_class'] = 'SASdata' |
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| 116 | if isinstance(data_obj, Data1D): |
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| 117 | self._write_1d_data(data_obj, data_entry) |
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| 118 | elif isinstance(data_obj, Data2D): |
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| 119 | self._write_2d_data(data_obj, data_entry) |
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| 120 | |
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| 121 | data_info = dataset[0] |
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| 122 | # Sample metadata |
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| 123 | sample_entry = sasentry.create_group('sassample') |
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| 124 | sample_entry.attrs['canSAS_class'] = 'SASsample' |
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| 125 | sample_entry['ID'] = _h5_string(data_info.sample.name) |
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| 126 | sample_attrs = ['thickness', 'temperature', 'transmission'] |
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| 127 | for key in sample_attrs: |
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| 128 | if getattr(data_info.sample, key) is not None: |
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| 129 | sample_entry.create_dataset(key, |
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| 130 | data=_h5_float(getattr(data_info.sample, key))) |
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| 131 | _write_h5_vector(sample_entry, data_info.sample.position) |
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| 132 | # NXcanSAS doesn't save information about pitch, only roll |
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| 133 | # and yaw. The _write_h5_vector method writes vector.y, but we |
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| 134 | # need to write vector.z for yaw |
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| 135 | data_info.sample.orientation.y = data_info.sample.orientation.z |
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| 136 | _write_h5_vector(sample_entry, data_info.sample.orientation, |
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| 137 | names=['polar_angle', 'azimuthal_angle']) |
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| 138 | if data_info.sample.details is not None\ |
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| 139 | and data_info.sample.details != []: |
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| 140 | details = None |
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| 141 | if len(data_info.sample.details) > 1: |
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| 142 | details = [np.string_(d) for d in data_info.sample.details] |
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| 143 | details = np.array(details) |
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| 144 | elif data_info.sample.details != []: |
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| 145 | details = _h5_string(data_info.sample.details[0]) |
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| 146 | if details is not None: |
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| 147 | sample_entry.create_dataset('details', data=details) |
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| 148 | |
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| 149 | # Instrument metadata |
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| 150 | instrument_entry = sasentry.create_group('sasinstrument') |
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| 151 | instrument_entry.attrs['canSAS_class'] = 'SASinstrument' |
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| 152 | instrument_entry['name'] = _h5_string(data_info.instrument) |
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| 153 | |
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| 154 | # Source metadata |
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| 155 | source_entry = instrument_entry.create_group('sassource') |
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| 156 | source_entry.attrs['canSAS_class'] = 'SASsource' |
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| 157 | if data_info.source.radiation is None: |
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| 158 | source_entry['radiation'] = _h5_string('neutron') |
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| 159 | else: |
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| 160 | source_entry['radiation'] = _h5_string(data_info.source.radiation) |
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| 161 | if data_info.source.beam_shape is not None: |
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| 162 | source_entry['beam_shape'] = _h5_string(data_info.source.beam_shape) |
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| 163 | wavelength_keys = { 'wavelength': 'incident_wavelength', |
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| 164 | 'wavelength_min':'wavelength_min', |
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| 165 | 'wavelength_max': 'wavelength_max', |
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| 166 | 'wavelength_spread': 'incident_wavelength_spread' } |
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| 167 | for sasname, nxname in wavelength_keys.items(): |
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| 168 | value = getattr(data_info.source, sasname) |
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| 169 | units = getattr(data_info.source, sasname + '_unit') |
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| 170 | if value is not None: |
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| 171 | source_entry[nxname] = _h5_float(value) |
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| 172 | source_entry[nxname].attrs['units'] = units |
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| 173 | _write_h5_vector(source_entry, data_info.source.beam_size, |
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| 174 | names=['beam_size_x', 'beam_size_y'], |
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| 175 | units=data_info.source.beam_size_unit, write_fn=_write_h5_float) |
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| 176 | |
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| 177 | # Collimation metadata |
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| 178 | if len(data_info.collimation) > 0: |
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| 179 | for i, coll_info in enumerate(data_info.collimation): |
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| 180 | collimation_entry = instrument_entry.create_group( |
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| 181 | 'sascollimation{0:0=2d}'.format(i + 1)) |
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| 182 | collimation_entry.attrs['canSAS_class'] = 'SAScollimation' |
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| 183 | if coll_info.length is not None: |
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| 184 | _write_h5_float(collimation_entry, coll_info.length, 'SDD') |
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| 185 | collimation_entry['SDD'].attrs['units'] =\ |
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| 186 | coll_info.length_unit |
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| 187 | if coll_info.name is not None: |
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| 188 | collimation_entry['name'] = _h5_string(coll_info.name) |
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| 189 | else: |
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| 190 | # Create a blank one - at least 1 collimation required by format |
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| 191 | instrument_entry.create_group('sascollimation01') |
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| 192 | |
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| 193 | # Detector metadata |
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| 194 | if len(data_info.detector) > 0: |
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| 195 | i = 1 |
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| 196 | for i, det_info in enumerate(data_info.detector): |
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| 197 | detector_entry = instrument_entry.create_group( |
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| 198 | 'sasdetector{0:0=2d}'.format(i + 1)) |
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| 199 | detector_entry.attrs['canSAS_class'] = 'SASdetector' |
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| 200 | if det_info.distance is not None: |
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| 201 | _write_h5_float(detector_entry, det_info.distance, 'SDD') |
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| 202 | detector_entry['SDD'].attrs['units'] =\ |
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| 203 | det_info.distance_unit |
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| 204 | if det_info.name is not None: |
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| 205 | detector_entry['name'] = _h5_string(det_info.name) |
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| 206 | else: |
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| 207 | detector_entry['name'] = _h5_string('') |
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| 208 | if det_info.slit_length is not None: |
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| 209 | _write_h5_float(detector_entry, det_info.slit_length, |
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| 210 | 'slit_length') |
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| 211 | detector_entry['slit_length'].attrs['units'] =\ |
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| 212 | det_info.slit_length_unit |
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| 213 | _write_h5_vector(detector_entry, det_info.offset) |
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| 214 | # NXcanSAS doesn't save information about pitch, only roll |
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| 215 | # and yaw. The _write_h5_vector method writes vector.y, but we |
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| 216 | # need to write vector.z for yaw |
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| 217 | det_info.orientation.y = det_info.orientation.z |
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| 218 | _write_h5_vector(detector_entry, det_info.orientation, |
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| 219 | names=['polar_angle', 'azimuthal_angle']) |
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| 220 | _write_h5_vector(detector_entry, det_info.beam_center, |
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| 221 | names=['beam_center_x', 'beam_center_y'], |
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| 222 | write_fn=_write_h5_float, units=det_info.beam_center_unit) |
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| 223 | _write_h5_vector(detector_entry, det_info.pixel_size, |
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| 224 | names=['x_pixel_size', 'y_pixel_size'], |
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| 225 | write_fn=_write_h5_float, units=det_info.pixel_size_unit) |
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| 226 | else: |
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| 227 | # Create a blank one - at least 1 detector required by format |
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| 228 | detector_entry = instrument_entry.create_group('sasdetector01') |
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| 229 | detector_entry.attrs['canSAS_class'] = 'SASdetector' |
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| 230 | detector_entry.attrs['name'] = '' |
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| 231 | |
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| 232 | # Process meta data |
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| 233 | for i, process in enumerate(data_info.process): |
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| 234 | process_entry = sasentry.create_group('sasprocess{0:0=2d}'.format( |
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| 235 | i + 1)) |
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| 236 | process_entry.attrs['canSAS_class'] = 'SASprocess' |
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| 237 | if process.name: |
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| 238 | name = _h5_string(process.name) |
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| 239 | process_entry.create_dataset('name', data=name) |
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| 240 | if process.date: |
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| 241 | date = _h5_string(process.date) |
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| 242 | process_entry.create_dataset('date', data=date) |
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| 243 | if process.description: |
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| 244 | desc = _h5_string(process.description) |
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| 245 | process_entry.create_dataset('description', data=desc) |
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| 246 | for j, term in enumerate(process.term): |
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| 247 | # Don't save empty terms |
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| 248 | if term: |
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| 249 | h5_term = _h5_string(term) |
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| 250 | process_entry.create_dataset('term{0:0=2d}'.format( |
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| 251 | j + 1), data=h5_term) |
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| 252 | for j, note in enumerate(process.notes): |
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| 253 | # Don't save empty notes |
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| 254 | if note: |
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| 255 | h5_note = _h5_string(note) |
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| 256 | process_entry.create_dataset('note{0:0=2d}'.format( |
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| 257 | j + 1), data=h5_note) |
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| 258 | |
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| 259 | # Transmission Spectrum |
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| 260 | for i, trans in enumerate(data_info.trans_spectrum): |
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| 261 | trans_entry = sasentry.create_group( |
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| 262 | 'sastransmission_spectrum{0:0=2d}'.format(i + 1)) |
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| 263 | trans_entry.attrs['canSAS_class'] = 'SAStransmission_spectrum' |
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| 264 | trans_entry.attrs['signal'] = 'T' |
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| 265 | trans_entry.attrs['T_axes'] = 'T' |
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| 266 | trans_entry.attrs['name'] = trans.name |
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| 267 | if trans.timestamp is not '': |
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| 268 | trans_entry.attrs['timestamp'] = trans.timestamp |
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| 269 | transmission = trans_entry.create_dataset('T', |
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| 270 | data=trans.transmission) |
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| 271 | transmission.attrs['unertainties'] = 'Tdev' |
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| 272 | trans_entry.create_dataset('Tdev', |
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| 273 | data=trans.transmission_deviation) |
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| 274 | trans_entry.create_dataset('lambda', data=trans.wavelength) |
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| 275 | |
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| 276 | note_entry = sasentry.create_group('sasnote'.format(i)) |
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| 277 | note_entry.attrs['canSAS_class'] = 'SASnote' |
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| 278 | notes = None |
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| 279 | if len(data_info.notes) > 1: |
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| 280 | notes = [np.string_(n) for n in data_info.notes] |
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| 281 | notes = np.array(notes) |
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| 282 | elif data_info.notes != []: |
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| 283 | notes = _h5_string(data_info.notes[0]) |
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| 284 | if notes is not None: |
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| 285 | note_entry.create_dataset('SASnote', data=notes) |
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| 286 | |
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| 287 | f.close() |
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| 288 | |
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| 289 | def _write_1d_data(self, data_obj, data_entry): |
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| 290 | """ |
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| 291 | Writes the contents of a Data1D object to a SASdata h5py Group |
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| 292 | |
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| 293 | :param data_obj: A Data1D object to write to the file |
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| 294 | :param data_entry: A h5py Group object representing the SASdata |
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| 295 | """ |
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| 296 | data_entry.attrs['signal'] = 'I' |
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| 297 | data_entry.attrs['I_axes'] = 'Q' |
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| 298 | data_entry.attrs['Q_indices'] = [0] |
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| 299 | q_entry = data_entry.create_dataset('Q', data=data_obj.x) |
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| 300 | q_entry.attrs['units'] = data_obj.x_unit |
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| 301 | i_entry = data_entry.create_dataset('I', data=data_obj.y) |
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| 302 | i_entry.attrs['units'] = data_obj.y_unit |
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| 303 | if data_obj.dy is not None: |
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| 304 | i_entry.attrs['uncertainties'] = 'Idev' |
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| 305 | i_dev_entry = data_entry.create_dataset('Idev', data=data_obj.dy) |
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| 306 | i_dev_entry.attrs['units'] = data_obj.y_unit |
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| 307 | if data_obj.dx is not None: |
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| 308 | q_entry.attrs['resolutions'] = 'dQ' |
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| 309 | dq_entry = data_entry.create_dataset('dQ', data=data_obj.dx) |
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| 310 | dq_entry.attrs['units'] = data_obj.x_unit |
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| 311 | elif data_obj.dxl is not None: |
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| 312 | q_entry.attrs['resolutions'] = ['dQl','dQw'] |
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| 313 | dql_entry = data_entry.create_dataset('dQl', data=data_obj.dxl) |
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| 314 | dql_entry.attrs['units'] = data_obj.x_unit |
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| 315 | dqw_entry = data_entry.create_dataset('dQw', data=data_obj.dxw) |
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| 316 | dqw_entry.attrs['units'] = data_obj.x_unit |
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| 317 | |
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| 318 | def _write_2d_data(self, data, data_entry): |
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| 319 | """ |
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| 320 | Writes the contents of a Data2D object to a SASdata h5py Group |
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| 321 | |
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| 322 | :param data: A Data2D object to write to the file |
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| 323 | :param data_entry: A h5py Group object representing the SASdata |
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| 324 | """ |
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| 325 | data_entry.attrs['signal'] = 'I' |
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| 326 | data_entry.attrs['I_axes'] = 'Qx,Qy' |
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| 327 | data_entry.attrs['Q_indices'] = [0,1] |
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| 328 | |
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| 329 | (n_rows, n_cols) = (len(data.y_bins), len(data.x_bins)) |
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| 330 | |
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| 331 | if n_rows == 0 and n_cols == 0: |
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| 332 | # Calculate rows and columns, assuming detector is square |
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| 333 | # Same logic as used in PlotPanel.py _get_bins |
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| 334 | n_cols = int(np.floor(np.sqrt(len(data.qy_data)))) |
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| 335 | n_rows = int(np.floor(len(data.qy_data) / n_cols)) |
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| 336 | |
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| 337 | if n_rows * n_cols != len(data.qy_data): |
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| 338 | raise ValueError("Unable to calculate dimensions of 2D data") |
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| 339 | |
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| 340 | intensity = np.reshape(data.data, (n_rows, n_cols)) |
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| 341 | qx = np.reshape(data.qx_data, (n_rows, n_cols)) |
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| 342 | qy = np.reshape(data.qy_data, (n_rows, n_cols)) |
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| 343 | |
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| 344 | i_entry = data_entry.create_dataset('I', data=intensity) |
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| 345 | i_entry.attrs['units'] = data.I_unit |
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| 346 | qx_entry = data_entry.create_dataset('Qx', data=qx) |
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| 347 | qx_entry.attrs['units'] = data.Q_unit |
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| 348 | qy_entry = data_entry.create_dataset('Qy', data=qy) |
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| 349 | qy_entry.attrs['units'] = data.Q_unit |
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| 350 | if data.err_data is not None and not all(data.err_data == [None]): |
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| 351 | d_i = np.reshape(data.err_data, (n_rows, n_cols)) |
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| 352 | i_entry.attrs['uncertainties'] = 'Idev' |
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| 353 | i_dev_entry = data_entry.create_dataset('Idev', data=d_i) |
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| 354 | i_dev_entry.attrs['units'] = data.I_unit |
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| 355 | if data.dqx_data is not None and not all(data.dqx_data == [None]): |
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| 356 | qx_entry.attrs['resolutions'] = 'dQx' |
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| 357 | dqx_entry = data_entry.create_dataset('dQx', data=data.dqx_data) |
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| 358 | dqx_entry.attrs['units'] = data.Q_unit |
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| 359 | if data.dqy_data is not None and not all(data.dqy_data == [None]): |
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| 360 | qy_entry.attrs['resolutions'] = 'dQy' |
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| 361 | dqy_entry = data_entry.create_dataset('dQy', data=data.dqy_data) |
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| 362 | dqy_entry.attrs['units'] = data.Q_unit |
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