from ..target.ATarget import ATarget from ..SpectralQty import SpectralQty import astropy.units as u from ..Entry import Entry from typing import Union import os.path class FileTarget(ATarget): """ A class to create a target from a file containing the spectral flux densities """ @u.quantity_input(wl_bins="length") def __init__(self, file: str, wl_bins: u.Quantity, size: str = "Point"): """ Initialize a new target from a file containing the spectral flux density values Parameters ---------- file : str The file to read the spectral flux density values from. The file needs to provide two columns: wavelength and the corresponding spectral flux density. The format of the file will be guessed by `astropy.io.ascii.read(). If the file doesn't provide units via astropy's enhanced CSV format, the units will be read from the column headers or otherwise assumed to be *nm* and *W / m^2 / nm*. wl_bins : length-Quantity Wavelengths used for binning size : str The size of the target. Can be either point or extended. """ # Create spectral quantity from file sfd = SpectralQty.fromFile(file, u.nm, u.W / (u.m ** 2 * u.nm)) # Initialize the super class super().__init__(sfd, wl_bins, size) @staticmethod def check_config(conf: Entry) -> Union[None, str]: """ Check the configuration for this class Parameters ---------- conf : Entry The configuration entry to be checked. Returns ------- mes : Union[None, str] The error message of the check. This will be None if the check was successful. """ mes = conf.check_file("file") if mes is not None: return mes mes = conf.check_quantity("wl_bins", u.m) if mes is not None: return mes mes = conf.check_selection("size", ["point", "extended"]) if mes is not None: return mes