# Licensed under a 3-clause BSD style license - see LICENSE.rst
import logging
import sys
import numpy as np
from astropy.io import fits
from astropy.table import Table
from astropy.utils import lazyproperty
from gammapy.utils.scripts import make_path
__all__ = ["HDULocation", "HDUIndexTable"]
log = logging.getLogger(__name__)
[docs]class HDULocation:
"""HDU localisation, loading and Gammapy object mapper.
This represents one row in `HDUIndexTable`.
It's more a helper class, that is wrapped by `~gammapy.data.DataStoreObservation`,
usually those objects will be used to access data.
See also :ref:`gadf:hdu-index`.
"""
def __init__(
self, obs_id, hdu_type, hdu_class, base_dir, file_dir, file_name, hdu_name
):
self.obs_id = obs_id
self.hdu_type = hdu_type
self.hdu_class = hdu_class
self.base_dir = base_dir
self.file_dir = file_dir
self.file_name = file_name
self.hdu_name = hdu_name
[docs] def info(self, file=None):
"""Print some summary info to stdout."""
if not file:
file = sys.stdout
print(f"OBS_ID = {self.obs_id}", file=file)
print(f"HDU_TYPE = {self.hdu_type}", file=file)
print(f"HDU_CLASS = {self.hdu_class}", file=file)
print(f"BASE_DIR = {self.base_dir}", file=file)
print(f"FILE_DIR = {self.file_dir}", file=file)
print(f"FILE_NAME = {self.file_name}", file=file)
print(f"HDU_NAME = {self.hdu_name}", file=file)
[docs] def path(self, abs_path=True):
"""Full filename path.
Include ``base_dir`` if ``abs_path`` is True.
"""
if abs_path:
return make_path(self.base_dir) / self.file_dir / self.file_name
else:
return make_path(self.file_dir) / self.file_name
[docs] def get_hdu(self):
"""Get HDU."""
filename = self.path(abs_path=True)
# Here we're intentionally not calling `with fits.open`
# because we don't want the file to remain open.
hdu_list = fits.open(filename, memmap=False)
return hdu_list[self.hdu_name]
[docs] def load(self):
"""Load HDU as appropriate class.
TODO: this should probably go via an extensible registry.
"""
hdu_class = self.hdu_class
filename = self.path()
hdu = self.hdu_name
if hdu_class == "events":
from gammapy.data import EventList
return EventList.read(filename, hdu=hdu)
elif hdu_class == "gti":
from gammapy.data import GTI
return GTI.read(filename, hdu=hdu)
elif hdu_class == "aeff_2d":
from gammapy.irf import EffectiveAreaTable2D
return EffectiveAreaTable2D.read(filename, hdu=hdu)
elif hdu_class == "edisp_2d":
from gammapy.irf import EnergyDispersion2D
return EnergyDispersion2D.read(filename, hdu=hdu)
elif hdu_class == "psf_table":
from gammapy.irf import PSF3D
return PSF3D.read(filename, hdu=hdu)
elif hdu_class == "psf_3gauss":
from gammapy.irf import EnergyDependentMultiGaussPSF
return EnergyDependentMultiGaussPSF.read(filename, hdu=hdu)
elif hdu_class == "psf_king":
from gammapy.irf import PSFKing
return PSFKing.read(filename, hdu=hdu)
elif hdu_class == "bkg_2d":
from gammapy.irf import Background2D
return Background2D.read(filename, hdu=hdu)
elif hdu_class == "bkg_3d":
from gammapy.irf import Background3D
return Background3D.read(filename, hdu=hdu)
else:
raise ValueError(f"Invalid hdu_class: {hdu_class}")
[docs]class HDUIndexTable(Table):
"""HDU index table.
See :ref:`gadf:hdu-index`.
"""
VALID_HDU_TYPE = ["events", "gti", "aeff", "edisp", "psf", "bkg"]
"""Valid values for `HDU_TYPE`."""
VALID_HDU_CLASS = [
"events",
"gti",
"aeff_2d",
"edisp_2d",
"psf_table",
"psf_3gauss",
"psf_king",
"bkg_2d",
"bkg_3d",
]
"""Valid values for `HDU_CLASS`."""
[docs] @classmethod
def read(cls, filename, **kwargs):
"""Read :ref:`gadf:hdu-index`.
Parameters
----------
filename : `pathlib.Path`, str
Filename
"""
filename = make_path(filename)
table = super().read(filename, **kwargs)
table.meta["BASE_DIR"] = filename.parent.as_posix()
return table
@property
def base_dir(self):
"""Base directory."""
return make_path(self.meta.get("BASE_DIR", ""))
[docs] def hdu_location(self, obs_id, hdu_type=None, hdu_class=None):
"""Create `HDULocation` for a given selection.
Parameters
----------
obs_id : int
Observation ID
hdu_type : str
HDU type (see `~gammapy.data.HDUIndexTable.VALID_HDU_TYPE`)
hdu_class : str
HDU class (see `~gammapy.data.HDUIndexTable.VALID_HDU_CLASS`)
Returns
-------
location : `~gammapy.data.HDULocation`
HDU location
"""
self._validate_selection(obs_id=obs_id, hdu_type=hdu_type, hdu_class=hdu_class)
idx = self.row_idx(obs_id=obs_id, hdu_type=hdu_type, hdu_class=hdu_class)
if len(idx) == 1:
idx = idx[0]
elif len(idx) == 0:
raise IndexError(
f"No HDU found matching: OBS_ID = {obs_id}, HDU_TYPE = {hdu_type}, HDU_CLASS = {hdu_class}"
)
else:
idx = idx[0]
log.warning(
f"Found multiple HDU matching: OBS_ID = {obs_id}, HDU_TYPE = {hdu_type}, HDU_CLASS = {hdu_class}."
f" Returning the first entry, which has "
f"HDU_TYPE = {self[idx]['HDU_TYPE']} and HDU_CLASS = {self[idx]['HDU_CLASS']}"
)
return self.location_info(idx)
def _validate_selection(self, obs_id, hdu_type, hdu_class):
"""Validate HDU selection.
The goal is to give helpful error messages to the user.
"""
if hdu_type is None and hdu_class is None:
raise ValueError("You have to specify `hdu_type` or `hdu_class`.")
if hdu_type and hdu_type not in self.VALID_HDU_TYPE:
valid = [str(_) for _ in self.VALID_HDU_TYPE]
raise ValueError(f"Invalid hdu_type: {hdu_type}. Valid values are: {valid}")
if hdu_class and hdu_class not in self.VALID_HDU_CLASS:
valid = [str(_) for _ in self.VALID_HDU_CLASS]
raise ValueError(
f"Invalid hdu_class: {hdu_class}. Valid values are: {valid}"
)
if obs_id not in self["OBS_ID"]:
raise IndexError(f"No entry available with OBS_ID = {obs_id}")
[docs] def row_idx(self, obs_id, hdu_type=None, hdu_class=None):
"""Table row indices for a given selection.
Parameters
----------
obs_id : int
Observation ID
hdu_type : str
HDU type (see `~gammapy.data.HDUIndexTable.VALID_HDU_TYPE`)
hdu_class : str
HDU class (see `~gammapy.data.HDUIndexTable.VALID_HDU_CLASS`)
Returns
-------
idx : list of int
List of row indices matching the selection.
"""
selection = self["OBS_ID"] == obs_id
if hdu_class:
is_hdu_class = self._hdu_class_stripped == hdu_class
selection &= is_hdu_class
if hdu_type:
is_hdu_type = self._hdu_type_stripped == hdu_type
selection &= is_hdu_type
idx = np.where(selection)[0]
return list(idx)
[docs] def location_info(self, idx):
"""Create `HDULocation` for a given row index."""
row = self[idx]
return HDULocation(
obs_id=row["OBS_ID"],
hdu_type=row["HDU_TYPE"].strip(),
hdu_class=row["HDU_CLASS"].strip(),
base_dir=self.base_dir.as_posix(),
file_dir=row["FILE_DIR"].strip(),
file_name=row["FILE_NAME"].strip(),
hdu_name=row["HDU_NAME"].strip(),
)
@lazyproperty
def _hdu_class_stripped(self):
return np.array([_.strip() for _ in self["HDU_CLASS"]])
@lazyproperty
def _hdu_type_stripped(self):
return np.array([_.strip() for _ in self["HDU_TYPE"]])
@lazyproperty
def obs_id_unique(self):
"""Observation IDs (unique)."""
return np.unique(np.sort(self["OBS_ID"]))
@lazyproperty
def hdu_type_unique(self):
"""HDU types (unique)."""
return list(np.unique(np.sort([_.strip() for _ in self["HDU_TYPE"]])))
@lazyproperty
def hdu_class_unique(self):
"""HDU classes (unique)."""
return list(np.unique(np.sort([_.strip() for _ in self["HDU_CLASS"]])))
[docs] def summary(self):
"""Summary report (str)."""
obs_id = self.obs_id_unique
return (
"HDU index table:\n"
f"BASE_DIR: {self.base_dir}\n"
f"Rows: {len(self)}\n"
f"OBS_ID: {obs_id[0]} -- {obs_id[-1]}\n"
f"HDU_TYPE: {self.hdu_type_unique}\n"
f"HDU_CLASS: {self.hdu_class_unique}\n"
)