52 lines
2.9 KiB
ReStructuredText
52 lines
2.9 KiB
ReStructuredText
In the following, the most important classes that are used by the software but not part of the radiation transportation pipeline are explained.
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Spectral Quantity
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-----------------
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.. figure:: images/SpectralQty.png
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:alt: Class Diagram
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Class diagram of the Spectral Quantity.
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All spectral quantities used for calculations, e.g. spectral flux densities, spectral reflectances, etc., are handled as ``SpectralQty``-objects.
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They can be set up either by providing the two arrays wavelength bins and the corresponding spectral quantity as parameters to the constructor or by reading them from a file using the class method ``fromFile()``.
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In the latter case, the file must be readable by astropy and the units of the columns may be contained in the column header in square brackets.
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``SpectralQty``-objects natively support mathematical operations like addition (``__add__()``), substraction (``__sub__()``), multiplication (``__mul__()``) as well as true division (``__truediv__()``) and comparison (``__eq__()``).
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These operations are defined for several other objects like ``SpectralQty``, ``int``, ``float`` as well as Lambda-functions.
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Additionally, the two methods ``rebin()`` and ``integrate()`` allow to change the spectral grid or integrate the quantity on the grid.
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.. _configuration:
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Configuration
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-------------
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.. figure:: images/Configuration.png
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:alt: Class Diagram
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Class diagram of the Configuration.
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The class ``Configuration`` contains all methods necessary to parse the XML-configuration file and convert it into a tree of :ref:`entry`-objects.
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This conversion is triggered in the beginning of the program flow.
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Additionally, the check of the parsed configuration is preformed by this class (``check_config()``, ``check_optical_components()``).
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In detail, the static ``checkConfig()``-method of the corresponding class is called on each Entry-object to perform the checks.
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Finally, this class also computes some meta options like the array containing the wavelength bins.
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.. _entry:
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Entry
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-----
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.. figure:: images/Entry.png
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:alt: Class Diagram
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Class diagram of the Entry.
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The class ``Entry`` is used to represent the tags of the XML-configuration file and provide basic test mechanisms.
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Each XML-tag is parsed by the :ref:`configuration` and converted into an ``Entry``-object.
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Thereby each attribute of the XML-tag is converted into an attribute of the corresponding ``Entry``-object.
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In case another attribute with the same name and the postfix *_unit* exists, both attributes are converted to an Astropy-Quantity object.
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In case a parameter is called ``val``, this parameter is returned if the ``Entry``-object is called.
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In order to allow checks on the attributes of an ``Entry``-object, the methods ``check_quantity()``, ``check_selection()``, ``check_file()``, ``check_path()`` and ``check_float()`` take the attribute name and possible a default value and return a string as check result.
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If the check is passed, ``None`` will be returned.
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