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Copyright (C) 2015 Red Hat, Inc.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions of
the GNU General Public License v.2, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY expressed or implied, including the implied warranties of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details. You should have received a copy of the
GNU General Public License along with this program; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. Any Red Hat trademarks that are incorporated in the
source code or documentation are not subject to the GNU General Public
License and may only be used or replicated with the express permission of
Red Hat, Inc.
**************
Error handling
**************
When an error or an unexpected event occurs during a Hawkey routine, an
exception is raised:
* if it is a general error that could be common to other Python programs, one of
the standard Python built-in exceptions is raised. For instance, ``IOError``
and ``TypeError`` can be raised from Hawkey.
* programming errors within Hawkey that cause unexpected or invalid states raise
the standard ``AssertionError``. These should be reported as bugs against
Hawkey.
* programming errors due to incorrect use of the library usually produce
``hawkey.ValueException`` or one of its subclasses, ``QueryException`` (poorly
formed Query) or ``ArchException`` (unrecognized architecture).
* sometimes there is a close call between blaming the error on an input
parameter or on something else, beyond the programmer's
control. ``hawkey.RuntimeException`` is generally used in this case.
* ``hawkey.ValidationException`` is raised when a function call performs a
preliminary check before proceeding with the main operation and this check
fails.
The class hierarchy for Hawkey exceptions is::
+-- hawkey.Exception
+-- hawkey.ValueException
| +-- hawkey.QueryException
| +-- hawkey.ArchException
+-- hawkey.RuntimeException
+-- hawkey.ValidationException
|
