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# coding: utf-8
"""
module to define some converter utils function
"""
import h5py
import h5py._hl.selections as selection
from silx.io.url import DataUrl
from silx.io.utils import open as open_hdf5
__all__ = ["from_data_url_to_virtual_source", "from_virtual_source_to_data_url"]
def from_data_url_to_virtual_source(url: DataUrl) -> tuple:
"""
:param url: url to be converted to a virtual source. It must target a 2D detector
:return: (h5py.VirtualSource, tuple(shape of the virtual source), numpy.drype: type of the dataset associated with the virtual source)
"""
if not isinstance(url, DataUrl):
raise TypeError(
f"url is expected to be an instance of DataUrl and not {type(url)}"
)
with open_hdf5(url.file_path()) as o_h5s:
original_data_shape = o_h5s[url.data_path()].shape
data_type = o_h5s[url.data_path()].dtype
if len(original_data_shape) == 2:
original_data_shape = (
1,
original_data_shape[0],
original_data_shape[1],
)
vs_shape = original_data_shape
if url.data_slice() is not None:
vs_shape = (
url.data_slice().stop - url.data_slice().start,
original_data_shape[-2],
original_data_shape[-1],
)
vs = h5py.VirtualSource(
url.file_path(), url.data_path(), shape=vs_shape, dtype=data_type
)
if url.data_slice() is not None:
vs.sel = selection.select(original_data_shape, url.data_slice())
return vs, vs_shape, data_type
def from_virtual_source_to_data_url(vs: h5py.VirtualSource) -> DataUrl:
if not isinstance(vs, h5py.VirtualSource):
raise TypeError(
f"vs is expected to be an instance of h5py.VirtualSorce and not {type(vs)}"
)
url = DataUrl(file_path=vs.path, data_path=vs.name, scheme="silx")
return url
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