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import os |
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from niprov.dependencies import Dependencies |
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from basefile import BaseFile |
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from dcm import DicomFile |
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from parrec import ParrecFile |
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from fif import FifFile |
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from nifti import NiftiFile |
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from niprov.cnt import NeuroscanFile |
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class FileFactory(object): |
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"""Creates customized File objects. |
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Based on libraries (python packages) installed and the filename, will |
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return an object that derives from niprov.basefile.BaseFile. |
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""" |
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formats = {'.par':('nibabel', ParrecFile), |
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'.dcm':('dicom', DicomFile), |
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'.cnt':(None, NeuroscanFile), |
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'.nii':(None, NiftiFile), |
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'.nii.gz':('nibabel', NiftiFile), |
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'.fif':('mne',FifFile)} |
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def __init__(self, dependencies=Dependencies()): |
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self.libs = dependencies.getLibraries() |
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self.listener = dependencies.getListener() |
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self.dependencies = dependencies |
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def locatedAt(self, location, provenance=None): |
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"""Return an object to represent the image file at the given location. |
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If no specific class is available to handle a file with the filename |
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provided, will default to a BaseFile. Similarly, if missing the |
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dependency to deal with the format, will fall back to a regular |
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BaseFile. |
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Args: |
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location: Path to the file to represent. |
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Returns: |
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:class:`.BaseFile`: An object that derives from BaseFile |
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""" |
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if location.lower()[-2:] == 'gz': |
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extension = '.'+('.'.join(location.lower().split('.')[-2:])) |
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else: |
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extension = os.path.splitext(location)[1].lower() |
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if extension not in self.formats: |
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return BaseFile(location, provenance=provenance, |
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dependencies=self.dependencies) |
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elif not self.libs.hasDependency(self.formats[extension][0]): |
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self.listener.missingDependencyForImage( |
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self.formats[extension][0], location) |
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return BaseFile(location, provenance=provenance, |
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dependencies=self.dependencies) |
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return self.formats[extension][1](location, provenance=provenance, |
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dependencies=self.dependencies) |
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def fromProvenance(self, provenance): |
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return self.locatedAt(provenance['location'], provenance) |
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ilogue /
niprov
